Very low complexity interpolative speech coding at 1.2 to 2.4 kbps
- 22 November 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 2 (15206149) , 1599-1602
- https://doi.org/10.1109/icassp.1997.596259
Abstract
The recently-introduced waveform interpolation (WI) coders provide good-quality speech at low rates but may be too complex for commercial use. This paper proposes new approaches to low-complexity WI speech coding at rates of 1.2 and 2.4 kbps. The proposed coders are 4 to 5 times faster than the previously reported ones. At 2.4 kbps, the complexity is about 7.5 and 2.5 MFLOPS for the encoder and decoder, respectively. At 1.2 kbps, the complexity is about 6 and 2.3 MFLOPS for the encoder and decoder, respectively. Informal subjective evaluation shows that, at 2.4 kbps, the quality is close to that of the high-complexity coders. The quality does not significantly degrade at 1.2 kbps and it is considered sufficient for messaging applications.Keywords
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