Gain control method for acoustic echo cancellation and suppression
US6961422B2 · kind B2 · utility
17Cited by
10References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 28, 2001 |
| Grant date | Nov 1, 2005 |
| Priority date | — |
| Expiry date | May 16, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A gain control method for reducing or eliminating the undesirable effects of acoustic echo coupling between a speaker and a microphone while providing a full-duplex connection. Weighted normalized far-end and near-end powers are used to first calculate a suppression value which is used to determine the attenuation factor between an upper and a lower limit, thus improving reliability in noisy environments. To further improve the quality of the full-duplex connection, a smoothing factor is applied to the attenuation calculation to provide a low power and constant sounding echo without annoying transient-like sounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.