Acoustic echo processing system
US6744887B1 · kind B1 · utility
24Cited by
12References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1999 |
| Grant date | Jun 1, 2004 |
| Priority date | — |
| Expiry date | Oct 5, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/23
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system and method of Acoustic Echo Cancellation includes a digital filter used to estimate the echo path is split into 2 filters: one fixed infinite impulse response (IIR) filter and one adaptive finite impulse response (FIR) filter. The fixed filter models the composite frequency response of the loudspeaker, its cabinet enclosure and the direct coupling path between the loudspeaker and the microphone(s). The adaptive filter models the time varying characteristics of the indirect coupling path between the loudspeaker and microphone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.