| (11) | EP 3 157 010 B1 |
(12) | EUROPEAN PATENT SPECIFICATION |
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(54) | AUDIO CODING AUDIOKODIERUNG CODAGE AUDIO |
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Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
TECHNICAL FIELD
BACKGROUND
SUMMARY
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1, FIG. 3, and FIG. 5 to FIG. 8 are schematic flowcharts of several audio coding methods according to examples useful for understanding the present invention;
FIG. 2 and FIG. 4 are schematic flowcharts of two audio coding methods according to embodiments of the present invention ;and
FIG. 9 and FIG. 10 are schematic diagrams of two types of audio coders according to examples useful for understanding the present invention.
DESCRIPTION OF EMBODIMENTS
the coding rate of the current audio frame is less than a threshold T1 (the threshold T1 may be, for example, greater than or equal to 24.4 kbps, 32 kbps, 64 kbps, or another rate);
the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is less than or equal to a threshold T2 (the threshold T2 may be, for example, greater than or equal to 1, 2, 3, 5, or another value);
the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is less than or equal to a threshold T3 (the threshold T3 may be, for example, greater than or equal to 10, 20, 35, or another value);
a quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is greater than or equal to a threshold T4 (the threshold T4 may be, for example, greater than or equal to 0.5, 1, 2, 3, or another value);
a difference of subtracting the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame from the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame is greater than or equal to a threshold T5 (the threshold T5 may be, for example, greater than or equal to 10, 20, 51, 100, or another value);
a quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is greater than or equal to a threshold T6 (the threshold T6 may be, for example, greater than or equal to 0.5, 1.1, 2, 3, or another value);
a difference of subtracting the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame from the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame is greater than or equal to a threshold T7 (the threshold T7 may be, for example, greater than or equal to 11, 20, 50, 101, or another value);
a ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame falls within an interval R1 (the interval R1 may be, for example, [0.5, 2], [0.4, 2.5], or another value);
an absolute value of a difference between the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is less than or equal to a threshold T8 (the threshold T8 may be, for example, greater than or equal to 1, 2, 3, or another value);
a ratio of the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame to the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame falls within an interval R2 (the interval R2 may be, for example, [0.5, 2], [0.4, 2.5], or another value);
an absolute value of a difference between the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is less than or equal to a threshold T9 (the threshold T9 may be, for example, greater than or equal to 10, 20, 35, or another value);
a ratio of the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame to the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame falls within an interval R3 (the interval R3 may be, for example, [0.5, 2], [0.4, 2.5], or another value);
an absolute value of a difference between the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is less than or equal to a threshold T10 (the threshold T10 may be, for example, greater than or equal to 11, 20, 50, 101, or another value); or
the parameter value of spectral correlation between the spectral coefficients that are located within the subband p and that is of the current audio frame and the spectral coefficients that are located within the subband q and that is of the current audio frame is greater than or equal to a threshold T11 (the threshold T11 may be, for example, 0.5, 0.8, 0.9, 1, or another value).
the coding rate of the current audio frame is greater than or equal to the threshold T1, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is greater than or equal to a threshold T12 (the threshold T12 may be, for example, greater than or equal to the threshold T4, and the threshold T12 may be, for example, greater than or equal to 2, 3, 5, 8, or another value);
the coding rate of the current audio frame is greater than or equal to the threshold T1, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is greater than or equal to a threshold T13 (the threshold T13 may be, for example, greater than or equal to the threshold T6, and the threshold T13 may be, for example, greater than or equal to 2, 3, 9, 7, or another value);
the coding rate of the current audio frame is greater than or equal to the threshold T1, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is less than or equal to a threshold T14 (the threshold T14 may be, for example, less than or equal to the threshold T2, and the threshold T14 may be, for example, less than or equal to 0.5, 2, 3, 1.5, 4, or another value);
the coding rate of the current audio frame is greater than or equal to the threshold T1, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is less than or equal to a threshold T15 (the threshold T15 may be, for example, less than or equal to the threshold T3, and the threshold T15 may be, for example, less than or equal to 5, 8, 10, 20, or another value);
the ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame does not fall within the interval R1, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is greater than or equal to a threshold T16 (the threshold T16 may be, for example, greater than or equal to the threshold T4, and the threshold T16 may be, for example, greater than or equal to 2, 3, 5, 8, or another value);
the ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame does not fall within the interval R1, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is greater than or equal to a threshold T17 (the threshold T17 may be, for example, greater than or equal to the threshold T6, and the threshold T17 may be, for example, greater than or equal to 2, 3, 9, 7, or another value);
the ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame does not fall within the interval R1, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is less than or equal to a threshold T18 (the threshold T18 may be, for example, less than or equal to the threshold T2, and the threshold T18 may be, for example, less than or equal to 0.5, 2, 3, 1.5, 4, 5, or another value);
the ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame does not fall within the interval R1, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is less than or equal to a threshold T19 (the threshold T19 may be, for example, less than or equal to the threshold T3, and the threshold T19 may be, for example, less than or equal to 5, 8, 10, 20, or another value);
the absolute value of the difference between the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is greater than the threshold T8, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is greater than or equal to a threshold T20 (the threshold T20 may be, for example, greater than or equal to the threshold T4, and the threshold T20 may be, for example, greater than or equal to 2, 3, 5, 8, or another value);
the absolute value of the difference between the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is greater than the threshold T8, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is greater than or equal to a threshold T21 (the threshold T21 may be, for example, greater than or equal to the threshold T6, and the threshold T21 may be, for example, greater than or equal to 2, 3, 9, 7, or another value);
the absolute value of the difference between the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is greater than the threshold T8, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is less than or equal to a threshold T22 (the threshold T22 may be, for example, less than or equal to the threshold T2, and the threshold T22 may be, for example, less than or equal to 0.5, 2, 3, 1.5, 4, 5, or another value);
the absolute value of the difference between the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is greater than the threshold T8, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is less than or equal to a threshold T23 (the threshold T23 may be, for example, less than or equal to the threshold T3, and the threshold T23 may be, for example, less than or equal to 5, 8, 10, 20, or another value);
the ratio of the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame to the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame does not fall within the interval R2, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is greater than or equal to a threshold T24 (the threshold T24 may be, for example, greater than or equal to the threshold T4, and the threshold T24 may be, for example, greater than or equal to 2, 3, 5, 8, or another value);
the ratio of the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame to the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame does not fall within the interval R2, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is greater than or equal to a threshold T25 (the threshold T25 may be, for example, greater than or equal to the threshold T6, and the threshold T25 may be, for example, greater than or equal to 2, 3, 9, 7, or another value);
the ratio of the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame to the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame does not fall within the interval R2, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is less than or equal to a threshold T26 (the threshold T26 may be, for example, less than or equal to the threshold T2, and the threshold T26 may be, for example, less than or equal to 0.5, 2, 3, 1.5, 4, 5, or another value);
the ratio of the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame to the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame does not fall within the interval R2, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is less than or equal to a threshold T27 (the threshold T27 may be, for example, less than or equal to the threshold T3, and the threshold T27 may be, for example, less than or equal to 5, 8, 10, 20, or another value);
the absolute value of the difference between the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is greater than the threshold T9, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is greater than or equal to a threshold T28 (the threshold T28 may be, for example, greater than or equal to the threshold T4, and the threshold T28 may be, for example, greater than or equal to 2, 3, 5, 8, or another value);
the absolute value of the difference between the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is greater than the threshold T9, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is greater than or equal to a threshold T29 (the threshold T29 may be, for example, greater than or equal to the threshold T6, and the threshold T29 may be, for example, greater than or equal to 2, 3, 9, 7, or another value);
the absolute value of the difference between the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is greater than the threshold T9, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is less than or equal to a threshold T30 (the threshold T30 may be, for example, less than or equal to the threshold T2, and the threshold T30 may be, for example, less than or equal to 0.5, 2, 3, 1.5, 4, 5, or another value);
the absolute value of the difference between the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is greater than the threshold T9, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is less than or equal to a threshold T31 (the threshold T31 may be, for example, less than or equal to the threshold T3, and the threshold T31 may be, for example, less than or equal to 5, 8, 10, 20, or another value);
the ratio of the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame to the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame falls within the interval R3, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is greater than or equal to a threshold T32 (the threshold T32 may be, for example, greater than or equal to the threshold T4, and the threshold T32 may be, for example, greater than or equal to 2, 3, 5, 8, or another value);
the ratio of the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame to the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame falls within the interval R3, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is greater than or equal to a threshold T33 (the threshold T33 may be, for example, greater than or equal to the threshold T6, and the threshold T33 may be, for example, greater than or equal to 2, 3, 9, 7, or another value);
the ratio of the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame to the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame falls within the interval R3, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is less than or equal to a threshold T34 (the threshold T34 may be, for example, less than or equal to the threshold T2, and the threshold T34 may be, for example, less than or equal to 0.5, 2, 3, 1.5, 4, 5, or another value);
the ratio of the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame to the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame falls within the interval R3, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is less than or equal to a threshold T35 (the threshold T35 may be, for example, less than or equal to the threshold T3, and the threshold T35 may be, for example, less than or equal to 5, 8, 9.5, 10, 15, 20, or another value);
the absolute value of the difference between of the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is greater than the threshold T10, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is greater than or equal to a threshold T36 (the threshold T36 may be, for example, greater than or equal to the threshold T4, and the threshold T36 may be, for example, greater than or equal to 2, 3, 5, 8, or another value);
the absolute value of the difference between of the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is greater than the threshold T10, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is greater than or equal to a threshold T37 (the threshold T37 may be, for example, greater than or equal to the threshold T6, and the threshold T37 may be, for example, greater than or equal to 2, 3, 9, 7, or another value);
the absolute value of the difference between of the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is greater than the threshold T10, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is less than or equal to a threshold T38 (the threshold T38 may be, for example, less than or equal to the threshold T2, and the threshold T38 may be, for example, less than or equal to 0.5, 2, 3, 1.5, 4, 5, or another value);
the absolute value of the difference between of the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is greater than the threshold T10, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is less than or equal to a threshold T39 (the threshold T39 may be, for example, less than or equal to the threshold T3, and the threshold T39 may be, for example, less than or equal to 5, 8, 9.5, 10, 15, 20, or another value);
the parameter value of spectral correlation between the spectral coefficients that are located within the subband p and that is of the current audio frame and the spectral coefficients that are located within the subband q and that is of the current audio frame is less than or equal to the threshold T11, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is greater than or equal to a threshold T40 (the threshold T40 may be, for example, greater than or equal to the threshold T4, and the threshold T40 may be, for example, greater than or equal to 2, 3, 5, 8, or another value);
the parameter value of spectral correlation between the spectral coefficients that are located within the subband p and that is of the current audio frame and the spectral coefficients that are located within the subband q and that is of the current audio frame is less than or equal to the threshold T11, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is greater than or equal to a threshold T41 (the threshold T41 may be, for example, greater than or equal to the threshold T6, and the threshold T41 may be, for example, greater than or equal to 2, 3, 9, 7, or another value);
the parameter value of spectral correlation between the spectral coefficients that are located within the subband p and that is of the current audio frame and the spectral coefficients that are located within the subband q and that is of the current audio frame is less than or equal to the threshold T11, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is less than or equal to a threshold T42 (the threshold T42 may be, for example, less than or equal to the threshold T2, and the threshold T42 may be, for example, less than or equal to 0.5, 2, 3, 1.5, 4, 5, or another value);
the parameter value of spectral correlation between the spectral coefficients that are located within the subband p and that is of the current audio frame and the spectral coefficients that are located within the subband q and that is of the current audio frame is less than or equal to the threshold T11, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is less than or equal to a threshold T43 (the threshold T43 may be, for example, less than or equal to the threshold T3, and the threshold T43 may be, for example, less than or equal to 5, 8, 9.5, 10, 15, 20, or another value);
a quotient of dividing the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame by the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is less than a threshold T44 (a value range of the threshold T44 may be, for example, 1.5 to 3), and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is less than a threshold T45 (a value range of the threshold T45 may be, for example, 1 to 3);
a quotient of dividing the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame by the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is greater than a threshold T46 (a value range of the threshold T46 may be, for example, 1.5 to 3), and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is greater than a threshold T47 (a value range of the threshold T47 may be, for example, 1 to 3);
a difference of subtracting the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame from the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame is less than a threshold T48 (a value range of the threshold T48 may be, for example, -1 to 3), and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is less than a threshold T49 (a value range of the threshold T49 may be, for example, 1 to 3);
a difference of subtracting the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame from the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame is greater than a threshold T50 (a value range of the threshold T50 may be, for example, -1 to 3), and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is greater than a threshold T51 (a value range of the threshold T51 may be, for example, 1 to 3);
a quotient of dividing the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame by the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is less than a threshold T52 (a value range of the threshold T52 may be, for example, 1 to 3), and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is less than a threshold T53 (the threshold T53 may be, for example, 10, 20, 30, or another value);
a quotient of dividing the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame by the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is greater than a threshold T54 (a value range of the threshold T54 may be, for example, 1 to 3), and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is greater than a threshold T55 (the threshold T55 may be, for example, 10, 20, 30, or another value);
a difference of subtracting the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame from the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame is less than a threshold T56 (a value range of the threshold T56 may be, for example, -40 to 40), and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is less than a threshold T57 (the threshold T57 may be, for example, 10, 20, 30, or another value);
a difference of subtracting the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame from the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame is greater than a threshold T58 (a value range of the threshold T58 may be, for example, -40 to 40), and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is greater than a threshold T59 (the threshold T59 may be, for example, 10, 20, 30, or another value);
a quotient of dividing the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame by the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is less than a threshold T60 (a value range of the threshold T60 may be, for example, 1 to 3), and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is less than a threshold T61 (the threshold T61 may be, for example, 10, 20, 30, or another value);
a quotient of dividing the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame by the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is greater than a threshold T62 (a value range of the threshold T62 may be, for example, 1 to 3), and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is greater than a threshold T63 (the threshold T63 may be, for example, 10, 20, 30, or another value);
a difference of subtracting the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame from the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame is less than a threshold T64 (a value range of the threshold T64 may be, for example, -40 to 40), and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is less than a threshold T65 (the threshold T65 may be, for example, 10, 20, 30, or another value);
a difference of subtracting the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame from the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame is greater than a threshold T66 (a value range of the threshold T66 may be, for example, -40 to 40), and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is greater than a threshold T67 (the threshold T67 may be, for example, 10, 20, 30, or another value);
the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is less than or equal to a threshold T68 (the threshold T68 may be, for example, less than or equal to 0.5, 1, 2, 3, or another value), and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is less than or equal to a threshold T69 (the threshold T69 may be, for example, less than or equal to 1, 2, 3, 5, or another value);
the difference of subtracting the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame from the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame is less than or equal to a threshold T70 (the threshold T70 may be, for example, less than or equal to 10, 20, 51, 100, or another value), and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is less than or equal to a threshold T71 (the threshold T71 may be, for example, less than or equal to 1, 2, 3, 5, or another value);
the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is less than or equal to a threshold T72 (the threshold T72 may be, for example, greater than or equal to 0.5, 1.1, 2, 3, or another value), and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is less than or equal to a threshold T73 (the threshold T73 may be, for example, less than or equal to 1, 2, 3, 5, or another value);
the difference of subtracting the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame from the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame is less than or equal to a threshold T74 (the threshold T74 may be, for example, greater than or equal to 11, 20, 50, 101, or another value), and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is less than or equal to a threshold T75 (the threshold T75 may be, for example, less than or equal to 1, 2, 3, 5, or another value);
the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is less than or equal to a threshold T76 (the threshold T76 may be, for example, less than or equal to 0.5, 1, 2, 3, or another value), and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is less than or equal to a threshold T77 (the threshold T77 may be, for example, greater than or equal to 10, 20, 35, or another value);
the difference of subtracting the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame from the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame is less than or equal to a threshold T78 (the threshold T78 may be, for example, less than or equal to 10, 20, 51, 100, or another value), and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is less than or equal to a threshold T79 (the threshold T79 may be, for example, greater than or equal to 10, 20, 35, or another value);
the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is less than or equal to a threshold T80 (the threshold T80 may be, for example, greater than or equal to 0.5, 1.1, 2, 3, or another value), and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is less than or equal to a threshold T81 (the threshold T81 may be, for example, greater than or equal to 10, 20, 35, or another value); or
the difference of subtracting the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame from the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame is less than or equal to a threshold T82 (the threshold T82 may be, for example, greater than or equal to 11, 20, 50, 101, or another value), and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is less than or equal to a threshold T83 (the threshold T83 may be, for example, greater than or equal to 10, 20, 35, or another value).
the coding rate of the current audio frame is greater than or equal to the threshold T1;
the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is greater than the threshold T2;
the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is greater than the threshold T3;
the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is less than the threshold T4;
the difference of subtracting the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame from the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame is less than the threshold T5;
the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is less than the threshold T6;
the difference of subtracting the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame from the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame is less than the threshold T7;
the ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame does not fall within the interval R1;
the absolute value of the difference between the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is greater than the threshold T8;
the ratio of the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame to the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame does not fall within the interval R2;
the absolute value of the difference between the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is greater than the threshold T9;
the ratio of the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame to the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame does not fall within the interval R3;
the absolute value of the difference between the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is greater than the threshold T10; or
the parameter value of spectral correlation between the spectral coefficients that are located within the subband p and that is of the current audio frame and the spectral coefficients that are located within the subband q and that is of the current audio frame is less than the threshold T11.
the coding rate of the current audio frame is greater than or equal to the threshold T1, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is less than the threshold T12;
the coding rate of the current audio frame is greater than or equal to the threshold T1, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is less than the threshold T13;
the coding rate of the current audio frame is greater than or equal to the threshold T1, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is greater than the threshold T14;
the coding rate of the current audio frame is greater than or equal to the threshold T1, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is greater than the threshold T15;
the ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame does not fall within the interval R1, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is less than the threshold T16;
the ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame does not fall within the interval R1, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is less than the threshold T17;
the ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame does not fall within the interval R1, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is greater than the threshold T18;
the ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame does not fall within the interval R1, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is greater than the threshold T19;
the absolute value of the difference between the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is greater than the threshold T8, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is less than the threshold T20;
the absolute value of the difference between the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is greater than the threshold T8, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is less than the threshold T21;
the absolute value of the difference between the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is greater than the threshold T8, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is greater than the threshold T22;
the absolute value of the difference between the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is greater than the threshold T8, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is greater than the threshold T23;
the ratio of the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame to the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame does not fall within the interval R2, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is less than the threshold T24;
the ratio of the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame to the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame does not fall within the interval R2, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is less than the threshold T25;
the ratio of the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame to the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame does not fall within the interval R2, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is greater than the threshold T26;
the ratio of the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame to the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame does not fall within the interval R2, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is greater than the threshold T27;
the absolute value of the difference between the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is greater than the threshold T9, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is less than the threshold T28;
the absolute value of the difference between the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is greater than the threshold T9, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is less than the threshold T29;
the absolute value of the difference between the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is greater than the threshold T9, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is greater than the threshold T30;
the absolute value of the difference between the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is greater than the threshold T9, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is greater than the threshold T31;
the ratio of the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame to the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame falls within the interval R3, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is less than the threshold T32;
the ratio of the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame to the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame falls within the interval R3, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is less than the threshold T33;
the ratio of the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame to the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame falls within the interval R3, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is greater than the threshold T34;
the ratio of the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame to the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame falls within the interval R3, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is greater than the threshold T35;
the absolute value of the difference between the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is greater than the threshold T10, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is less than the threshold T36;
the absolute value of the difference between the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is greater than the threshold T10, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband n and that is of the current audio frame is less than the threshold T37;
the absolute value of the difference between the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is greater than the threshold T10, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is greater than the threshold T38;
the absolute value of the difference between the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is greater than the threshold T10, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is greater than the threshold T39;
the parameter value of spectral correlation between the spectral coefficients that are located within the subband p and that is of the current audio frame and the spectral coefficients that are located within the subband q and that is of the current audio frame is less than or equal to the threshold T11, and the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is less than the threshold T40;
the parameter value of spectral correlation between the spectral coefficients that are located within the subband p and that is of the current audio frame and the spectral coefficients that are located within the subband q and that is of the current audio frame is less than or equal to the threshold T11, and the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is less than the threshold T41;
the parameter value of spectral correlation between the spectral coefficients that are located within the subband p and that is of the current audio frame and the spectral coefficients that are located within the subband q and that is of the current audio frame is less than or equal to the threshold T11, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is greater than the threshold T42;
the parameter value of spectral correlation between the spectral coefficients that are located within the subband p and that is of the current audio frame and the spectral coefficients that are located within the subband q and that is of the current audio frame is less than or equal to the threshold T11, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is greater than the threshold T43;
the quotient of dividing the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame by the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is less than the threshold T44, and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is greater than the threshold T45;
the quotient of dividing the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame by the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is greater than the threshold T46, and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is less than the threshold T47;
the difference of subtracting the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame from the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame is less than the threshold T48, and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is greater than the threshold T49;
the difference of subtracting the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame from the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame is greater than the threshold T50, and the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame is less than the threshold T51;
the quotient of dividing the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame by the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is less than the threshold T52, and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is greater than the threshold T53;
the quotient of dividing the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame by the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is greater than the threshold T54, and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is less than the threshold T55;
the difference of subtracting the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame from the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame is less than the threshold T56, and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is greater than the threshold T57;
the difference of subtracting the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame from the envelope deviation of the spectral coefficients that are located within the subband r and that is of the current audio frame is greater than the threshold T58, and the envelope deviation of the spectral coefficients that are located within the subband s and that is of the current audio frame is less than the threshold T59;
the quotient of dividing the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame by the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is less than the threshold T60, and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is greater than the threshold T61;
the quotient of dividing the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame by the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is greater than the threshold T62, and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is less than the threshold T63;
the difference of subtracting the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame from the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame is less than the threshold T64, and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is greater than the threshold T65;
the difference of subtracting the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame from the envelope of the spectral coefficients that are located within the subband e and that is of the current audio frame is greater than the threshold T66, and the envelope of the spectral coefficients that are located within the subband f and that is of the current audio frame is less than the threshold T67;
the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is less than or equal to the threshold T68, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is greater than the threshold T69;
the difference of subtracting the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame from the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame is less than or equal to the threshold T70, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is greater than the threshold T71;
the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is less than or equal to the threshold T72, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is greater than the threshold T73;
the difference of subtracting the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame from the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame is less than or equal to the threshold T74, and the peak-to-average ratio of the spectral coefficients that are located within the subband z and that is of the current audio frame is greater than the threshold T75;
the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is less than or equal to the threshold T76, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is greater than the threshold T77;
the difference of subtracting the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame from the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame is less than or equal to the threshold T78, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is greater than the threshold T79;
the quotient of dividing the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame by the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame is less than or equal to the threshold T80, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is greater than the threshold T81; or
the difference of subtracting the amplitude average of the spectral coefficients that are located within the subband n and that is of the current audio frame from the amplitude average of the spectral coefficients that are located within the subband m and that is of the current audio frame is less than or equal to the threshold T82, and the envelope deviation of the spectral coefficients that are located within the subband w and that is of the current audio frame is greater than the threshold T83.
performing (201) time-frequency transformation processing on a time-domain signal of a current audio frame, to obtain spectral coefficients of the current audio frame;
acquiring (202) an energy average of spectral coefficients that is located within a subband i and that is of the current audio frame and an energy average of spectral coefficients that is located within a subband j and that is of the current audio frame; and
determining (203) whether a quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is greater than or equal to a threshold T4;
if the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is greater than or equal to the threshold T4, coding (204) spectral coefficients of the current audio frame based on a transform coded excitation algorithm; and
if the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is less than the threshold T4, coding (205) spectral coefficients of the current audio frame based on a high quality transform coding algorithm.
performing (401) time-frequency transformation processing on a time-domain signal of a current audio frame, to obtain spectral coefficients of the current audio frame;
acquiring (402) a peak-to-average ratio of spectral coefficients that is located within a subband x and that is of the current audio frame and a peak-to-average ratio of spectral coefficients that is located within a subband y and that is of the current audio frame;
determining (403) whether a ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame falls within an interval R1;
if the ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame falls within an interval R1, coding (404) spectral coefficients of the current audio frame based on a transform coded excitation algorithm; and
if the ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame does not fall within the interval R1, coding (405) spectral coefficients of the current audio frame based on a high quality transform coding algorithm.
a unit configured to perform time-frequency transformation processing on a time-domain signal of a current audio frame, to obtain spectral coefficients of the current audio frame;
a unit configured to acquire an energy average of spectral coefficients that is located within a subband i and that is of the current audio frame and an energy average of spectral coefficients that is located within a subband j and that is of the current audio frame;
a unit configured to determine whether a quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is greater than or equal to a threshold T4;
a unit configured to code spectral coefficients of the current audio frame based on a transform coded excitation algorithm if the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is greater than or equal to the threshold T4; and
a unit configured to code spectral coefficients of the current audio frame based on a high quality transform coding algorithm if the quotient of dividing the energy average of the spectral coefficients that are located within the subband i and that is of the current audio frame by the energy average of the spectral coefficients that are located within the subband j and that is of the current audio frame is less than the threshold T4.
a unit configured to perform time-frequency transformation processing on a time-domain signal of a current audio frame, to obtain spectral coefficients of the current audio frame;
a unit configured to acquire a peak-to-average ratio of spectral coefficients that is located within a subband x and that is of the current audio frame and a peak-to-average ratio of spectral coefficients that is located within a subband y and that is of the current audio frame;
a unit configured to determine whether a ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame falls within an interval R1;
a unit configured to code spectral coefficients of the current audio frame based on a transform coded excitation algorithm if the ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame falls within an interval R1; and
a unit configured to code spectral coefficients of the current audio frame based on a high quality transform coding algorithm if the ratio of the peak-to-average ratio of the spectral coefficients that are located within the subband x and that is of the current audio frame to the peak-to-average ratio of the spectral coefficients that are located within the subband y and that is of the current audio frame does not fall within the interval R1.
Durchführen (201) von Zeit-Frequenz-Transformationsverarbeitung an einem Zeitdomänensignal eines aktuellen Audiorahmens, um Spektralkoeffizienten des aktuellen Audiorahmens zu erhalten;
Erfassen (202) eines Energiedurchschnitts von Spektralkoeffizienten, der in einem Teilband i vorliegt und der für den aktuellen Audiorahmen gilt, und eines Energiedurchschnitts von Spektralkoeffizienten, der in einem Teilband j vorliegt und der für den aktuellen Audiorahmen gilt; und
Ermitteln (203), ob ein Quotient der Division des Energiedurchschnitts der Spektralkoeffizienten, die im Teilband i vorliegen und für den aktuellen Audiorahmen gelten, durch den Energiedurchschnitt der Spektralkoeffizienten, die im Teilband j vorliegen und für den aktuellen Audiorahmen gelten, größer als ein oder gleich einem Schwellenwert T4 ist;
falls der Quotient der Division des Energiedurchschnitts der Spektralkoeffizienten, die im Teilband i vorliegen und für den aktuellen Audiorahmen gelten, durch den Energiedurchschnitt der Spektralkoeffizienten, die im Teilband j vorliegen und für den aktuellen Audiorahmen gelten, größer als der oder gleich dem Schwellenwert T4 ist:
Codieren (204) von Spektralkoeffizienten des aktuellen Audiorahmens basierend auf einem transformationscodierten Anregungsalgorithmus; und
falls der Quotient der Division des Energiedurchschnitts der Spektralkoeffizienten, die im Teilband i vorliegen und für den aktuellen Audiorahmen gelten, durch den Energiedurchschnitt der Spektralkoeffizienten, die im Teilband j vorliegen und für den aktuellen Audiorahmen gelten, kleiner als der Schwellenwert T4 ist: Codieren (205) von Spektralkoeffizienten des aktuellen Audiorahmens basierend auf einem hochwertigen Transformationscodieralgorithmus.
Durchführen (401) von Zeit-Frequenz-Transformationsverarbeitung an einem Zeitdomänensignal eines aktuellen Audiorahmens, um Spektralkoeffizienten des aktuellen Audiorahmens zu erhalten;
Erfassen (402) eines Peak-zu-Durchschnitt-Verhältnisses von Spektralkoeffizienten, das in einem Teilband x vorliegt und das für den aktuellen Audiorahmen gilt, und eines Peak-zu-Durchschnitt-Verhältnisses von Spektralkoeffizienten, das in einem Teilband y vorliegt und für den aktuellen Audiorahmen gilt;
Ermitteln (403), ob ein Verhältnis des Peak-zu-Durchschnitt-Verhältnisses der Spektralkoeffizienten, die in dem Teilband x vorliegen und für den aktuellen Audiorahmen gelten, zu dem Peak-zu-Durchschnitt-Verhältnis der Spektralkoeffizienten, die im Teilband y vorliegen und für den aktuellen Audiorahmen gelten, in ein Intervall R1 fällt;
falls das Verhältnis des Peak-zu-Durchschnitt-Verhältnisses der Spektralkoeffizienten, die im Teilband x vorliegen und für den aktuellen Audiorahmen gelten, zu dem Peak-zu-Durchschnitt-Verhältnis der Spektralkoeffizienten, die im Teilband y vorliegen und für den aktuellen Audiorahmen gelten, in ein Intervall R1 fällt: Codieren (404) von Spektralkoeffizienten des aktuellen Audiorahmens basierend auf einem transformationscodierten Anregungsalgorithmus; und
falls das Verhältnis des Peak-zu-Durchschnitt-Verhältnisses der Spektralkoeffizienten, die im Teilband x vorliegen und für den aktuellen Audiorahmen gelten, zu dem Peak-zu-Durchschnitt-Verhältnis der Spektralkoeffizienten, die im Teilband y vorliegen und für den aktuellen Audiorahmen gelten, nicht in das Intervall R1 fällt: Codieren (405) von Spektralkoeffizienten des aktuellen Audiorahmens basierend auf einem hochwertigen Transformationscodieralgorithmus.
eine Einheit, ausgelegt zum Durchführen von Zeit-Frequenz-Transformationsverarbeitung an einem Zeitdomänensignal eines aktuellen Audiorahmens, um Spektralkoeffizienten des aktuellen Audiorahmens zu erhalten;
eine Einheit, ausgelegt zum Erfassen eines Energiedurchschnitts von Spektralkoeffizienten, der in einem Teilband i vorliegt und der für den aktuellen Audiorahmen gilt, und eines Energiedurchschnitts von Spektralkoeffizienten, der in einem Teilband j vorliegt und der für den aktuellen Audiorahmen gilt;
eine Einheit, ausgelegt zum Ermitteln, ob ein Quotient der Division des Energiedurchschnitts der Spektralkoeffizienten, die im Teilband i vorliegen und für den aktuellen Audiorahmen gelten, durch den Energiedurchschnitt der Spektralkoeffizienten, die im Teilband j vorliegen und für den aktuellen Audiorahmen gelten, größer als ein oder gleich einem Schwellenwert T4 ist;
eine Einheit, ausgelegt zum Codieren von Spektralkoeffizienten des aktuellen Audiorahmens basierend auf einem transformationscodierten Anregungsalgorithmus, falls der Quotient der Division des Energiedurchschnitts der Spektralkoeffizienten, die im Teilband i vorliegen und für den aktuellen Audiorahmen gelten, durch den Energiedurchschnitt der Spektralkoeffizienten, die im Teilband j vorliegen und für den aktuellen Audiorahmen gelten, durch den Energiedurchschnitt der Spektralkoeffizienten, die im Teilband j vorliegen und für den aktuellen Audiorahmen gelten, größer als der oder gleich dem Schwellenwert T4 ist; und
eine Einheit, ausgelegt zum Codieren von Spektralkoeffizienten des aktuellen Audiorahmens basierend auf einem hochwertigen Transformationscodieralgorithmus, falls der Quotient der Division des Energiedurchschnitts der Spektralkoeffizienten, die im Teilband i vorliegen und für den aktuellen Audiorahmen gelten, durch den Energiedurchschnitt der Spektralkoeffizienten, die im Teilband j vorliegen und für den aktuellen Audiorahmen gelten, kleiner ist als der Schwellenwert T4.
eine Einheit, ausgelegt zum Durchführen von Zeit-Frequenz-Transformationsverarbeitung an einem Zeitdomänensignal eines aktuellen Audiorahmens, um Spektralkoeffizienten des aktuellen Audiorahmens zu erhalten;
eine Einheit, ausgelegt zum Erfassen eines Peak-zu-Durchschnitt-Verhältnisses von Spektralkoeffizienten, das in einem Teilband x vorliegt und das für den aktuellen Audiorahmen gilt, und eines Peak-zu-Durchschnitt-Verhältnisses von Spektralkoeffizienten, das in einem Teilband y vorliegt und für den aktuellen Audiorahmen gilt;
eine Einheit, ausgelegt zum Ermitteln, ob ein Verhältnis des Peak-zu-Durchschnitt-Verhältnisses der Spektralkoeffizienten, die in dem Teilband x vorliegen und für den aktuellen Audiorahmen gelten, zu dem Peak-zu-Durchschnitt-Verhältnis der Spektralkoeffizienten, die im Teilband y vorliegen und für den aktuellen Audiorahmen gelten, in ein Intervall R1 fällt;
eine Einheit, ausgelegt zum Codieren von Spektralkoeffizienten des aktuellen Audiorahmens basierend auf einem transformationscodierten Anregungsalgorithmus, falls das Verhältnis des Peak-zu-Durchschnitt-Verhältnisses der Spektralkoeffizienten, die im Teilband x vorliegen und für den aktuellen Audiorahmen gelten, zu dem Peak-zu-Durchschnitt-Verhältnis der Spektralkoeffizienten, die im Teilband y vorliegen und für den aktuellen Audiorahmen gelten, in ein Intervall R1 fällt; und
eine Einheit, ausgelegt zum Codieren von Spektralkoeffizienten des aktuellen Audiorahmens basierend auf einem hochwertigen Transformationscodieralgorithmus, falls das Verhältnis des Peak-zu-Durchschnitt-Verhältnisses der Spektralkoeffizienten, die im Teilband x vorliegen und für den aktuellen Audiorahmen gelten, zu dem Peak-zu-Durchschnitt-Verhältnis der Spektralkoeffizienten, die im Teilband y vorliegen und für den aktuellen Audiorahmen gelten, nicht in das Intervall R1 fällt.
réaliser (201) un traitement de transformation temps-fréquence sur un signal en domaine temporel d'une trame audio actuelle, afin d'obtenir des coefficients spectraux de la trame audio actuelle ;
acquérir (202) une moyenne d'énergie de coefficients spectraux qui sont situés dans une sous-bande i et qui sont de la trame audio actuelle et une moyenne d'énergie de coefficients spectraux qui sont situés dans une sous-bande j et qui sont de la trame audio actuelle ; et
déterminer (203) si un quotient de la division de la moyenne d'énergie des coefficients spectraux qui sont situés dans la sous-bande i et qui sont de la trame audio actuelle par la moyenne d'énergie des coefficients spectraux qui sont situés dans la sous-bande j et qui sont de la trame audio actuelle est supérieur ou égal à un seuil T4 ;
si le quotient de la division de la moyenne d'énergie des coefficients spectraux qui sont situés dans la sous-bande i et qui sont de la trame audio actuelle par la moyenne d'énergie des coefficients spectraux qui sont situés dans la sous-bande j et qui sont de la trame audio actuelle est supérieur ou égal au seuil T4, coder (204) des coefficients spectraux de la trame audio actuelle sur la base d'un algorithme d'excitation codé par transformée ; et
si le quotient de la division de la moyenne d'énergie des coefficients spectraux qui sont situés dans la sous-bande i et qui sont de la trame audio actuelle par la moyenne d'énergie des coefficients spectraux qui sont situés dans la sous-bande j et qui sont de la trame audio actuelle est inférieur au seuil T4, coder (205) des coefficients spectraux de la trame audio actuelle sur la base d'un algorithme de codage par transformée de haute qualité.
réaliser (401) un traitement de transformation temps-fréquence sur un signal en domaine temporel d'une trame audio actuelle, afin d'obtenir des coefficients spectraux de la trame audio actuelle ;
acquérir (402) un rapport valeur de crête-valeur moyenne de coefficients spectraux qui sont situés dans une sous-bande x et qui sont de la trame audio actuelle et un rapport valeur de crête-valeur moyenne de coefficients spectraux qui sont situés dans une sous-bande y et qui sont de la trame audio actuelle ;
déterminer (403) si un rapport entre le rapport valeur de crête-valeur moyenne des coefficients spectraux qui sont situés dans la sous-bande x et qui sont de la trame audio actuelle et le rapport valeur de crête-valeur moyenne des coefficients spectraux qui sont situés dans la sous-bande y et qui sont de la trame audio actuelle tombe dans un intervalle R1 ;
si le rapport entre le rapport valeur de crête-valeur moyenne des coefficients spectraux qui sont situés dans la sous-bande x et qui sont de la trame audio actuelle et le rapport valeur de crête-valeur moyenne des coefficients spectraux qui sont situés dans la sous-bande y et qui sont de la trame audio actuelle tombe dans un intervalle R1, coder (404) des coefficients spectraux de la trame audio actuelle sur la base d'un algorithme d'excitation codé par transformée ; et
si le rapport entre le rapport valeur de crête-valeur moyenne des coefficients spectraux qui sont situés dans la sous-bande x et qui sont de la trame audio actuelle et le rapport valeur de crête-valeur moyenne des coefficients spectraux qui sont situés dans la sous-bande y et qui sont de la trame audio actuelle ne tombe pas dans l'intervalle R1, coder (405) des coefficients spectraux de la trame audio actuelle sur la base d'un algorithme de codage par transformée de haute qualité.
une unité configurée pour réaliser un traitement de transformation temps-fréquence sur un signal en domaine temporel d'une trame audio actuelle, afin d'obtenir des coefficients spectraux de la trame audio actuelle ;
une unité configurée pour acquérir une moyenne d'énergie de coefficients spectraux qui sont situés dans une sous-bande i et qui sont de la trame audio actuelle et une moyenne d'énergie de coefficients spectraux qui sont situés dans une sous-bande j et qui sont de la trame audio actuelle ;
une unité configurée pour déterminer si un quotient de la division de la moyenne d'énergie des coefficients spectraux qui sont situés dans la sous-bande i et qui sont de la trame audio actuelle par la moyenne d'énergie des coefficients spectraux qui sont situés dans la sous-bande j et qui sont de la trame audio actuelle est supérieur ou égal à un seuil T4 ;
une unité configurée pour coder des coefficients spectraux de la trame audio actuelle sur la base d'un algorithme d'excitation codé par transformée si le quotient de la division de la moyenne d'énergie des coefficients spectraux qui sont situés dans la sous-bande i et qui sont de la trame audio actuelle par la moyenne d'énergie des coefficients spectraux qui sont situés dans la sous-bande j et qui sont de la trame audio actuelle est supérieur ou égal au seuil T4 ; et
une unité configurée pour coder des coefficients spectraux de la trame audio actuelle sur la base d'un algorithme de codage par transformée de haute qualité si le quotient de la division de la moyenne d'énergie des coefficients spectraux qui sont situés dans la sous-bande i et qui sont de la trame audio actuelle par la moyenne d'énergie des coefficients spectraux qui sont situés dans la sous-bande j et qui sont de la trame audio actuelle est inférieur au seuil T4.
une unité configurée pour réaliser un traitement de transformation temps-fréquence sur un signal en domaine temporel d'une trame audio actuelle, afin d'obtenir des coefficients spectraux de la trame audio actuelle ;
une unité configurée pour acquérir un rapport valeur de crête-valeur moyenne de coefficients spectraux qui sont situés dans une sous-bande x et qui sont de la trame audio actuelle et un rapport valeur de crête-valeur moyenne de coefficients spectraux qui sont situés dans une sous-bande y et qui sont de la trame audio actuelle ;
une unité configurée pour déterminer si un rapport entre le rapport valeur de crête-valeur moyenne des coefficients spectraux qui sont situés dans la sous-bande x et qui sont de la trame audio actuelle et le rapport valeur de crête-valeur moyenne des coefficients spectraux qui sont situés dans la sous-bande y et qui sont de la trame audio actuelle tombe dans un intervalle ;
une unité configurée pour coder des coefficients spectraux de la trame audio actuelle sur la base d'un algorithme d'excitation codé par transformée si le rapport entre le rapport valeur de crête-valeur moyenne des coefficients spectraux qui sont situés dans la sous-bande x et qui sont de la trame audio actuelle et le rapport valeur de crête-valeur moyenne des coefficients spectraux qui sont situés dans la sous-bande y et qui sont de la trame audio actuelle tombe dans un intervalle ; et
une unité configurée pour coder des coefficients spectraux de la trame audio actuelle sur la base d'un algorithme de codage par transformée de haute qualité si le rapport entre le rapport valeur de crête-valeur moyenne des coefficients spectraux qui sont situés dans la sous-bande x et qui sont de la trame audio actuelle et le rapport valeur de crête-valeur moyenne des coefficients spectraux qui sont situés dans la sous-bande y et qui sont de la trame audio actuelle ne tombe pas dans l'intervalle R1.
REFERENCES CITED IN THE DESCRIPTION
Non-patent literature cited in the description