Auto-tuning of an acoustic echo canceller
US9692882B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2015 |
| Grant date | Jun 27, 2017 |
| Priority date | — |
| Expiry date | Apr 22, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/002
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that estimate from a microphone signal to output an echo cancelled signal, the system comprising an echo measurement unit configured to calculate a ratio of the microphone signal to the far-end signal, an attenuation unit configured to attenuate at least one of the microphone signal and the far-end signal to output a second microphone signal and a second far-end signal to the echo canceller, the ratio of the second microphone signal to the second far-end signal being different from the calculated ratio, and an attenuation controller configured to control the attenuation unit, in dependence on the calculated ratio, so as to alter the ratio of the second microphone signal to the second far-end signal and control the echo-cancelled signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.