Vector quantization encoder and vector quantization decoder

Details Vector quantization encoder and vector quantization decoder Vector quantization encoder and vector quantization decoder

1990-08-03

1992-09-29

Shaw, Dale M.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

381 31, G10L 300

Patent

active

051519682

ABSTRACT:
An apparatus for compressing and decompressing speech signals. The encoder or decoder comprises a plurality of codebooks each controlling a plurality of indexed code vectors for a different frequency band. Each of the codebooks is provided with a synthesis filter for reproducing a signal wave shape based on a code vector provided by the corresponding codebook. The encoder or decoder further comprises an adder for computing a sum of signal wave shapes reproduced by the synthesis filters. This arrangement can reduce the memory size of each codebook used for an encoding or a decoding process and an amount of operations of the encoding or decoding process.

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Schroeder, M. R. and Atal, B. S. "Code-Excited Linear Prediction (Celp): High-Auality Speech at very Low Bit Rates" pp. 937-940 Proceedings of ICASSP '85.
Davidson, G. and Gersho. A. "Complexity Reduction Methods for Vector Excitation Coding" pp. 3055-3058 Proceedings of ICASSP '86.

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