Title :
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
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;
Conference_Titel :
Speech Coding Proceedings, 1999 IEEE Workshop on
Conference_Location :
Porvoo
Print_ISBN :
0-7803-5651-9
DOI :
10.1109/SCFT.1999.781505
