Method and device for coding and decoding speech signals using i

Details Method and device for coding and decoding speech signals using i Method and device for coding and decoding speech signals using i

1993-08-18

1995-11-07

MacDonald, Allen R.

395 229, 395 232, G10L 900

Patent

active

054653169

ABSTRACT:
The present invention relates to method and device for coding speech and to method and device for inverse-quantizing signals coded by the speech coding method. The object of the present invention is to realize an improved coding accuracy and an improved predictive gain by using a correlation between frames of a spectrum, if necessary, in an coding step. A first filter uses a coefficient determined by a predictive coefficient analyzed in a previous frame. After an input speech signal is subjected to a inverse filtering process by the first filter, the first predictive residual signal obtained is subjected to a linear predictive coding to obtain a predictive coefficient. A second filter subjects the predictive coefficient to an inverse filtering process and the resultant second predictive residual signal is quantized.

REFERENCES:
patent: 4924508 (1990-05-01), Crepy et al.
patent: 4965789 (1990-10-01), Bottau et al.
patent: 5060268 (1991-10-01), Asakawa et al.
patent: 5206884 (1993-04-01), Bhaskar
patent: 5307441 (1994-04-01), Tzeng
patent: 5327520 (1994-07-01), Chen
patent: 5341456 (1984-08-01), DeJaco

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