Method for adaptively controlling the pitch gain of a vocoder's adaptive codebook
US5960386A · kind A · utility
19Cited by
13References
15Claims
0Family size
Inventors
Key dates
| Filing date | May 17, 1996 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | May 17, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2007/145
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pitch gain of the adaptive codebook portion of a vocoder's encoder is monitored to determine when an instability condition is about to occur by examining a pitch gain value and an averaged pitch gain value. When an instability is likely, the output of a gain control unit is set to an adaptive gain control value. When an instability is unlikely, the gain control unit passes the pitch gain to its output unmodified.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.