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Audio communication device and method using fixed echo cancellation filter coefficients

  • US 9,185,233 B2
  • Filed: 05/25/2010
  • Issued: 11/10/2015
  • Est. Priority Date: 05/25/2010
  • Status: Expired due to Fees
First Claim
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1. An apparatus, comprising:

  • a downlink;

    andan echo cancellation module configured to filter a first signal on the downlink using a dynamic set of filter coefficients and one static set of filter coefficients selected from a static first set of filter coefficients and a static second set of filter coefficients to generate a second signal, and to generate a third signal based on a difference between the second signal and a fourth signal that is based on sound received by a first microphone,wherein the echo cancellation module is configured to use the static first set of filter coefficients for a first mode of operation and the static second set of filter coefficients for a second, different mode of operation and wherein the one static set of filter coefficients for the first mode of operation improves a single talk echo performance by about 5 to 10 dB compared to filtering the first signal using only the dynamic set of filter coefficients.

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