A low bit rate codec for AMR standard

A low bit rate codec for AMR standard

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...

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Bibliographische Detailangaben
Hauptverfasser: Foodeei, M., Zarrinkoub, H., Matmti, R., Rabipour, R., Gabin, F., Gosne, S.
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Bit rate
Business
Code standards
Delay estimation
Source coding
Speech analysis
Speech codecs
Speech coding
Testing
Vector quantization
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Beschreibung
Zusammenfassung: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.
DOI:10.1109/SCFT.1999.781505