Speech parameter coding method and appparatus

Details Speech parameter coding method and appparatus Speech parameter coding method and appparatus

1992-02-26

1996-01-23

Knepper, David D.

395 228, G10L 500, G10L 914

Patent

active

054871280

ABSTRACT:
A speech parameter coding method and apparatus which can quantize a spectrum parameter of a speech signal with a smaller number of bits smaller than ever. A dividing section divides a predetermined order number of spectrum parameters, obtained by division of a speech signal into frames, for each order number of spectrum parameters smaller than the divisional order number. A vector quantizing section searches codebooks for the divided spectrum parameters for each order number and outputs a plurality of candidates of codevector in order of magnitude from the minimum one. An accumulated distortion calculating section calculates accumulated distortions for the entire order number for combinations of codevectors. A minimum judging section selectively outputs a combination of codevectors which minimizes the accumulated distortion thereby to quantize the spectrum parameter.

REFERENCES:
patent: 5142581 (1992-08-01), Tokuda et al.
patent: 5208862 (1993-05-01), Ozawa
patent: 5271089 (1993-12-01), Ozawa
Schroeder, et al., Code-Excited Linear Prediction (CLEP): High-Quality Speech At Very Low Bit Rates; pp. 937-940; 1985 IEEE.
Kleiijn, et al., Improved Speech Quality and Efficient Vector Quantization in Selp; pp. 155-158, 1988 IEEE.
Masaaki Honda, Speech Coding Using Waveform Matching Based on LPC Residual Phase Equalization; pp. 213-216; 1990 IEEE.
Iso, et al., Speaker-Independent Word Recognition Using a Neural Prediction Model pp. 441-444; 1990 IEEE.
Sugamura, et al., Quantizer Design in LSP Speech Analysis-Synthesis; pp. 432-440; IEEE Journal on Selected Areas in Communications, vol. 6, No. 2 Feb. 1988.

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