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Frequency-domain-stereophonic-acoustic-echo-canceller-utilizing-non-linear-transformations

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Frequency domain stereophonic acoustic echo canceller utilizing non-linear transformations

Details

Inventors: Benesty, Jacob;
Assignee: Agere Systems, Inc. (Allentown, PA)
Primary Examiner: Tieu; Binh
Assistant Examiner:
Attorney, Agent or Firm: Synnestvedt & Lechner LLP

The invention is a multiple channel teleconferencing system employing a stereophonic acoustic echo canceler that exploits the coherence between multiple channels. In accordance with the invention a small non-linearity is incorporated into each channel path between the microphone and the speaker and an efficient frequency domain adaptive algorithm is implemented in the echo canceler circuit. The frequency domain algorithm converges to a solution much more quickly, than, for instance, a time domain, normalized least mean squares, solution.

DETAILED DESCRIPTION The invention is a multiple channel teleconferencing system employing a stereophonic acoustic echo canceller that exploits the coherence between multiple channels.
In accordance with the invention a small non-linearity is incorporated into each channel path between the microphone and the speaker and an efficient frequency domain adaptive algorithm is implemented in the echo canceler circuit.
The frequency domain algorithm converges to a solution much more quickly, than, for instance, a time domain, FRLS, solution.

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