Split vector quantization using unequal subvectors

Details Split vector quantization using unequal subvectors Split vector quantization using unequal subvectors

1995-12-26

2000-10-17

Knepper, David D.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

G10L 500

Patent

active

061345202

ABSTRACT:
A 1200 b/s vocoder providing a high degree of speech intelligibility and natural voice quality includes a tenth-order linear prediction analyzer, a split vector quantizer for line spectral frequencies, circuitry providing voicing classification and pitch estimation, a differential pitch and gain quantizer and a multiplexer for producing an encoded word transmitted to a receptive demultiplexer. The vocoder provides a characteristic encoded word including a first codeword, a second codeword, a pitch codeword and a gain codeword, wherein the first and second codewords are selected from respective first and second codebooks having a equal number of codewords and wherein the first and second codewords represent unequal numbers of elements of respective first and second sub-vectors. A codebook populating method for a split vector quantizer vocoder is also utilized.

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K. K. Paliwal et al, "Efficient Vector Quantization of LPC Parameters at 24 Bits/Frame", ICASSP 91, vol. 1, 1991 International Conference on Acoustics, Speech and Signal Processing, May 14-17, 1991, pp. 661-664.

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