Vector quantinizer with distance measure calculated by using cor

Details Vector quantinizer with distance measure calculated by using cor Vector quantinizer with distance measure calculated by using cor

1997-05-16

1998-06-02

MacDonald, Allen R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704216, 704217, 704222, 704219, 704220, G10L 302

Patent

active

057616329

ABSTRACT:
A vector quantizer for a speech coder for coding speech signals at low bit rates. The vector quantizer includes an auto-correlation calculation circuit for calculating an impulse response of a weighting function for each sub-interval of an input signal vector. The vector quantizer also includes a weighted cross-correlation calculation circuit for calculating a weighted cross-correlation of the weighted input signal vector and the weighted codevector having a code length equal to that of the input signal vector. The vector quantizer further includes a weighted auto-correlation calculation circuit for calculating an auto-correlation of the weighted codevectors, by using respective auto-correlations of the impulse responses, the codevectors and the cross-correlations. A distance between the input signal vector and the codevector is calculated by using the cross-correlations of the weighted input signal vector and the weighted codevectors, and the auto-correlation of the weighted codevector, and an index of a codevector corresponding to the minimum distance is obtained by an inspection circuit.

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