System and method for clock synchronization of acoustic echo canceller (AEC) with different sampling clocks for speakers and microphones
US9025762B2 · kind B2 · utility
6Cited by
2References
29Claims
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Key dates
| Filing date | Oct 23, 2012 |
| Grant date | May 5, 2015 |
| Priority date | — |
| Expiry date | Dec 17, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Clock synchronization for an acoustic echo canceller (AEC) with a speaker and a microphone connected over a digital link may be provided. A clock difference may be estimated by analyzing the speaker signal and the microphone signal in the digital domain. The clock synchronization may be combined in both hardware and software. This synchronization may be performed in two stages, first with coarse synchronization in hardware, then fine synchronization in software with, for example, a re-sampler.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.