Quantization of linear prediction coefficients

(19)

(11)

EP 0 899 720 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	15.09.1999 Bulletin 1999/37

(43)	Date of publication A2:
	03.03.1999 Bulletin 1999/09

(21)	Application number: 98306906.3

(22)	Date of filing: 27.08.1998

(51)	International Patent Classification (IPC)⁶: G10L 9/14

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

28.08.1997 US 57114 P

(71)	Applicant: TEXAS INSTRUMENTS INC.
	Dallas, Texas 75243 (US)

(72)	Inventor:
	McCree, Alan V. Dallas Texas 75248 (US)

(74)	Representative: Potter, Julian Mark et al
	D. Young & Co., 21 New Fetter Lane London EC4A 1DA London EC4A 1DA (GB)

(54)	Quantization of linear prediction coefficients

(57) A new method for quantization of the LPC coefficients in a speech coder includes a new weighted error measure including every frame sampling an impulse response from LPC filter (21) of said coder, filtering the samples using a perceptual weighting filter (47) and processing in a computer (39) to calculate autocorrelation function of the weighted impulse response, computing Jacobian matrix for LSF (Line Spectral Frequency), computing correlation of rows of Jacobian matrix and calculating LSF weights by multiplying correlation matrices.

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