Acoustic echo and noise cancellation

Details Acoustic echo and noise cancellation Acoustic echo and noise cancellation

2006-06-06

2006-06-06

Lee, Ping (Department: 2644)

Electrical audio signal processing systems and devices

Feedback suppression

C381S066000, C379S406080, C708S322000

Reexamination Certificate

active

07058185

ABSTRACT:
Stereo echo cancellation is necessary to overcome the objections observed by, for example, teleconferencing, voice controlled video/audio apparatuses, etc. To improve the existing filters, an adaptive filter is used along with a signal processing device which obtain the coefficient updates in the transformed domain, reducing the required calculation complexity. Further, the filter includes circuitry for reducing the correlation between the input signals on the coefficient updates.

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John J. Shynk, “Frequency-domain and Multirate Adaptive Filtering”, IEEE SP Magazine, Jan. 1992, pp. 15-37.

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