Method for the modification of LPC coefficients of acoustic sign

Details Method for the modification of LPC coefficients of acoustic sign Method for the modification of LPC coefficients of acoustic sign

1996-03-11

1998-03-24

MacDonald, Allen R.

395 229, 395 271, G10L 904

Patent

active

057321884

ABSTRACT:
In a CELP coding scheme, p-order LPC coefficients of an input signal are transformed into n-order LPC cepctrum coefficients c.sub.j (S.sub.2), which are modified into n-order modified LPC cepstrum coefficients c.sub.j ' (S.sub.3). Log power spectral envelopes of the input signal and a masking function suited thereto are calculated (FIGS. 3B, C), then they are subjected to inverse Fourier transform to obtain n-order LPC cepstrum coefficients, respectively, (FIGS. 3D, E), then the relationship between corresponding orders of the LPC cepstrum coefficients is calculated, and the modification in step S.sub.3 is carried out on the basis of the relationship. The modified coefficients c.sub.j are inversely transformed by the method of least squares into m-order LPC coefficients for use as filter coefficients of a perceptual weighting filter. This concept is applicable to a postfilter as well.

REFERENCES:
patent: 4811376 (1989-03-01), Davis et al.

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