Code-excited linear predictive coder and decoder with conversion

Details Code-excited linear predictive coder and decoder with conversion Code-excited linear predictive coder and decoder with conversion

1995-11-14

1998-05-12

MacDonald, Allen R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704223, 704262, 704264, 704278, G01L 914

Patent

active

057522235

ABSTRACT:
A code-excited linear predictive coder or decoder for a speech signal has an adaptive codebook, a stochastic codebook, and a pulse codebook. A constant excitation signal is obtained by choosing between a stochastic excitation signal selected from the stochastic codebook and an impulsive excitation signal selected from the pulse codebook. The constant excitation signal is filtered to produce a varied excitation signal more closely resembling the original speech signal. The varied excitation signal is combined with an adaptive excitation signal selected from the adaptive codebook to produce a final excitation signal, which is filtered to generate a synthesized speech signal. The final excitation signal is also used to update the adaptive codebook.

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Allen Gersho, "Advances in Speech and Audio Compression," Proc. IEEE, vol. 82, No. 6, pp. 900-918, Jun. 1994.

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