A low bit rate codec for AMR standard

Author

Foodeei, M. ; Zarrinkoub, H. ; Matmti, R. ; Rabipour, R. ; Gabin, F. ; Gosné, S.

Author_Institution

Nortel Networks, Verdun, Que., Canada

fYear

1999

fDate

1999

Firstpage

123

Lastpage

125

Abstract

We describe a low bit rate speech codec based on the RCELP paradigm and designed as a candidate for GSM-AMR. The relaxation of the waveform-matching constraint in the RCELP model allows for reducing the bit rate without affecting the speech quality. New efficient quantization methods for the LSF and gain parameters coupled with some algorithmic improvements result in a high quality speech codec at bit rates as low as 4.55 kbit/s. Subjective tests show encouraging results in terms of quality and robustness under various operating conditions

Keywords

cellular radio; channel coding; linear predictive coding; quantisation (signal); spectral analysis; speech codecs; speech coding; speech intelligibility; telecommunication standards; 4.55 kbit/s; AMR standard; GSM-AMR; LSF parameters; RCELP model; bit rate reduction; channel coding; gain parameters; low bit rate speech codec; quantization methods; speech coding; speech quality; subjective tests; waveform-matching constraint; Bit rate; Business; Code standards; Delay estimation; Source coding; Speech analysis; Speech codecs; Speech coding; Testing; Vector quantization;

fLanguage

English

Publisher

ieee

Conference_Titel

Speech Coding Proceedings, 1999 IEEE Workshop on

Conference_Location

Porvoo

Print_ISBN

0-7803-5651-9

Type

conf

DOI

10.1109/SCFT.1999.781505

Filename

781505