Adaptive codebook

Details Adaptive codebook Adaptive codebook

1998-06-16

2000-04-18

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704223, G10L 1912

Patent

active

060526602

ABSTRACT:
In a CELP system, a coder and a decoder have identical codebooks, and the amount of data to be transmitted is compressed by transmission and reception of codebook indexes. Past excitation signals are stored in a memory and used as an adaptive codebook to improve the speech quality. The coder and the decoder each comprise memory means for storing index data for at least one frame, and means for generating an adaptive codebook afresh by initialization to zero for each frame when generating an excitation signal according to stored indexes.

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Gerson, "Vector Sum Excited Linear Prediction (VSELP) Speech Coding For Japan Digital Cellular" IEICE pp. 35-40 (1990).

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