Speech classification embedded in adaptive codebook search for low bit-rate CELP coding

Author

Kuo, Chih-Chung ; Jean, Fu-Rong ; Wang, Hsiao-Chuan

Author_Institution

Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan

Volume

3

Issue

1

fYear

1995

fDate

1/1/1995 12:00:00 AM

Firstpage

94

Lastpage

98

Abstract

This correspondence proposes a new CELP coding method which embeds speech classification in adaptive codebook search. This approach can retain the synthesized speech quality at bit-rates below 4 kb/s. A pitch analyzer is designed to classify each frame by its periodicity, and with a finite-state machine, one of four states is determined. Then the adaptive codebook search scheme is switched according to the state. Simulation results show that higher SEGSNR and lower computation complexity can be achieved, and the pitch contour of the synthesized speech is smoother than that produced by conventional CELP coders

Keywords

adaptive codes; finite state machines; linear predictive coding; search problems; speech coding; speech synthesis; 4 kbit/s; adaptive codebook search; embedding; finite-state machine; higher SEGSNR; low bit-rate CELP coding; periodicity; pitch analyzer; pitch contour; pitch-based-finite-state CELP coding; simulation; speech classification; synthesized speech quality; Computational modeling; Councils; Decoding; Delay; Filters; Linear predictive coding; Speech analysis; Speech coding; Speech recognition; Speech synthesis;

fLanguage

English

Journal_Title

Speech and Audio Processing, IEEE Transactions on

Publisher

ieee

ISSN

1063-6676

Type

jour

DOI

10.1109/89.365377

Filename

365377