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Reference signal generation for acoustic echo cancellation

  • US 9,978,387 B1
  • Filed: 08/05/2013
  • Issued: 05/22/2018
  • Est. Priority Date: 08/05/2013
  • Status: Active Grant
First Claim
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1. A speech interface system, comprising:

  • a housing;

    a speaker positioned at least partly within the housing and configured to generate output audio based at least in part on an output audio signal;

    one or more input microphones positioned to produce an input audio signal, the input audio signal representing user speech and one or more echoed components of the output audio from the speaker;

    a reference microphone positioned within a compartment of the housing, the reference microphone to produce a reference audio signal, wherein a relative magnitude of the output audio to the user speech is greater in the reference audio signal than in the input audio signal, wherein the compartment is disposed at least partly between the speaker and the one or more input microphones;

    an adaptive filter configured to produce an estimated echo signal representing the one or more echoed components of the output audio from the speaker as represented by the input audio signal, based at least in part on the reference audio signal;

    a subtraction component configured to subtract the estimated echo signal from the input audio signal to produce an echo-suppressed audio signal; and

    one or more speech processing components configured to perform speech recognition on the echo-suppressed audio signal.

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