Comfort noise generator for echo cancelers
US5949888A · kind A · utility
57Cited by
7References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1995 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Sep 15, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2021/02082
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The invention describes a method and device of comfort noise generation for echo cancelers. The invention stores the actual background noise of a channel in a noise buffer. When the echo suppressor is activated by the echo canceler to suppress any unwanted signals on the channel, the buffer provides the stored noise to the channel to provide continuous background noise. To ensure that neither speech nor impulse noise enters the buffer, hangover delays and energy threshold levels are provided such that signals within the delay period or signals which exceed the energy threshold level are screened from entering the buffer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.