Enhanced waveform interpolative coder
US7643996B1 · kind B1 · utility
8Cited by
5References
34Claims
0Family size
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Key dates
| Filing date | Dec 1, 1999 |
| Grant date | Jan 5, 2010 |
| Priority date | — |
| Expiry date | Dec 1, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/097
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An Enhanced analysis-by-synthesis Waveform Interpolative speech coder able to operate at 4 kbps. Novel features include analysis-by-synthesis quantization of the slowly evolving waveform, analysis-by-synthesis vector quantization of the dispersion phase, a special pitch search for transitions, and switched-predictive analysis-by-synthesis gain vector quantization. Subjective quality tests indicate that it exceeds MPEG-4 at 4 kbps and of G.723.1 at 6.3 kbps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.