Predictive speech signal coding with reduced noise effects
US4133976A · kind A · utility
58Cited by
4References
14Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 7, 1978 |
| Grant date | Jan 9, 1979 |
| Priority date | — |
| Expiry date | Apr 7, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/042
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A predictive speech signal processor features an adaptive filter in a feedback network around the quantizer. The adaptive filter essentially combines the quantizing error signal, the formant related prediction parameter signals and the difference signal to concentrate the quantizing error noise in spectral peaks corresponding to the time-varying formant portions of the speech spectrum so that the quantizing noise is masked by the speech signal formants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.