Acoustic echo cancellation in an integrated audio and telecommunication system
US5706344A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 1996 |
| Grant date | Jan 6, 1998 |
| Priority date | — |
| Expiry date | Mar 29, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/505
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Robust acoustic echo cancellation in a single-channel integrated audio and intercom system is provided by adapting echo cancellation filters in accordance with an optimized autocorrelation matrix. This is carried out in a modified FIR LMS filter in which the adaptation regressor signal is formed by a combination of one or more of the received voice signal, the received audio signal, and/or a random noise signal. In a SISO system, it is usually desirable to shelter the regressor signal from tonal components such as voice signals. In a multiple-channel system, it is usually desirable to shelter regressor signals for a particular channel from acoustic components that are likely to be correlated to acoustic components in other parts of the system and are likely to affect that particular channel. In multi-channel applications, it is therefore usually desirable to shelter regressor signals from audio signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.