A vector ADPCM analysis-by-synthesis configuration for 16 kbit/s speech coding

Author

Watts, Lloyd ; Cuperman, Vladimir

Author_Institution

Dept. of Eng. Sci., Simon Fraser Univ., Burnaby, BC, Canada

fYear

1988

fDate

28 Nov-1 Dec 1988

Firstpage

275

Abstract

A speech-coding algorithm based on the introduction of a vector quantizer into an ADPCM (adaptive differential pulse code modulation) configuration is presented. This vector ADPCM (VADPCM) algorithm is directed toward low-complexity, low-delay (0-5 ms), 16-kb/s applications. An analysis-by-synthesis configuration is used to allow the vector quantizer to operate with the usual scalar linear predictor. Performance/complexity tradeoffs are described. Methods for reducing the implementation complexity to the level of the standard 32-kb/s CCITT algorithm are indicated. Noise feedback, postfiltering, and gain-adaptive vector quantization are used to improve the performance while maintaining low complexity

Keywords

data compression; encoding; noise; pulse-code modulation; speech analysis and processing; 16 kbit/s; adaptive differential pulse code modulation; data compression; noise feedback; postfiltering; scalar linear predictor; speech-coding algorithm; vector ADPCM analysis-by-synthesis configuration; vector quantisation; Degradation; Delay; Feedback; Noise figure; Predictive coding; Speech analysis; Speech coding; Speech enhancement; Transmitters; Vector quantization;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 1988, and Exhibition. 'Communications for the Information Age.' Conference Record, GLOBECOM '88., IEEE

Conference_Location

Hollywood, FL

Type

conf

DOI

10.1109/GLOCOM.1988.25850

Filename

25850