Speech coding/decoding system with reduced quantization noise
US5113448A · kind A · utility
13Cited by
3References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1989 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | Dec 15, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/04
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An input speech signal is encoded by an adaptive quantizer device (16). The adaptive quantizer device quantizes the predicted residual signal produced by removing correlations from the digital input signal by predictors devices (6, 10). A coefficient or weighting factor, called a leakage, at the predictor device (6) is adaptively adjusted by a leakage selector device (47) depending upon a prediction gain. The prediction gain indicates the accuracy of the prediction. The value of leakage is in the range between 0 and 1, depending upon whether the speech signal is voiced sound or unvoiced sound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.