Variable frame rate speech coding using optimal interpolation

Author

Sin-Horng Chen

Volume

42

Issue

6

fYear

1994

fDate

6/1/1994 12:00:00 AM

Firstpage

2215

Lastpage

2218

Abstract

A VFR LPC vocoder using optimal interpolation is presented in this paper. In the encoder, some representative frames of an utterance are selected for transmission. In the decoder, LPC parameters of all untransmitted frames are restored by optimal interpolation. Simulation results show that this coding scheme outperforms the conventional VFR vocoder using linear interpolation. By incorporating contour quantization of gain and pitch information, a low variable-rate LPC vocoder is realized. An informal listening test shows that very high intelligible reconstructed speech was obtained at an average data rate of 300 bps

Keywords

interpolation; linear predictive coding; speech coding; speech intelligibility; vector quantisation; vocoders; 300 bit/s; LPC parameters; LPC vocoder; average data rate; contour quantization; encoder; gain information; informal listening test; intelligible reconstructed speech; optimal interpolation; pitch information; simulation results; speech coding; variable frame rate; Decoding; Feature extraction; Interpolation; Linear predictive coding; Oral communication; Quantization; Speech coding; Speech processing; Testing; Vocoders;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.293669

Filename

293669