Coefficient domain history storage of voice processing systems
US7085245B2 · kind B2 · utility
3Cited by
8References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 5, 2001 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Aug 7, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2021/02082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for canceling a near-end echo of a far-end signal for each channel of a voice over packet multi-channel communications gateway. The invention applies “off-the-shelf” coding mechanisms as well as novel coding schemes to provide fixed compression rate and with options to maintain perfect speech integrity on certain processing components, such as network echo canceller, acoustic echo canceller, Voice Activity Detector, Comfort Noise Generation, etc. The off-the-shelf compression algorithm includes LPC-10, G.723.1, G.729A. The alternatives are Wavelet transform, DPCM, and ADPCM, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.