Global patent index - EP 1048025 A1

EP 1048025 A1 2000-11-02 - METHOD FOR INSTRUMENTAL VOICE QUALITY EVALUATION

Title (en)

METHOD FOR INSTRUMENTAL VOICE QUALITY EVALUATION

Title (de)

VERFAHREN ZUR INSTRUMENTELLEN SPRACHQUALITÄTSBESTIMMUNG

Title (fr)

PROCEDE DE DETERMINATION INSTRUMENTALE DE LA QUALITE VOCALE

Publication

EP 1048025 A1 (DE)

Application

EP 99942871 A

Priority

  • DE 19840548 A
  • EP 9905972 W

Abstract (en)

[origin: DE19840548A1] Known methods for instrumental voice quality evaluation based on comparing signal intensities of the voice signal to be evaluated with a reference voice signal do not optimally evaluate spectral distortions in the voice signal to be evaluated so that quality evaluation is unreliable. Moreover, by integrating the signal intensity in the frequency bands with constant band limits, certain falsifications of the voice signal to be evaluated, such as those caused, for instance, by coding systems with lower bit rates, are erroneously evaluated. In order to enhance prediction reliability of the evaluated quality parameters, distortions of the mean spectral envelope are extensively corrected with a weighting function WT(f) before comparing spectral properties. On the other hand, the fixed band limits for integration of spectral power density are suppressed and other band limits are searched for instead in a predetermined optimization area in which the resulting spectral intensity representations of the voice signal to be evaluated and the reference voice signal have maximum similarity. The solutions described can supplement known methods and can be incorporated into their structures.

IPC 1-7 (main, further and additional classification)

G10L 19/00

IPC 8 full level (invention and additional information)

G10L 25/48 (2013.01); G10L 25/69 (2013.01)

CPC (invention and additional information)

G10L 25/69 (2013.01); G10L 25/48 (2013.01)

Citation (search report)

See references of WO 0013173A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

DE 19840548 A1 20000302; DE 19840548 C2 20010215; AT 253765 T 20031115; CA 2305652 A1 20000309; EP 1048025 A1 20001102; EP 1048025 B1 20031105; US 7013266 B1 20060314; WO 0013173 A1 20000309

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