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Suppression of echo signals and the like

  • US 7,062,040 B2
  • Filed: 09/20/2002
  • Issued: 06/13/2006
  • Est. Priority Date: 09/20/2002
  • Status: Expired due to Term
First Claim
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1. A method for processing audio signals, comprising the steps of:

  • (a) receiving an input signal, wherein the input signal is applied to a speaker;

    (b) receiving a microphone signal generated by a microphone;

    (c) estimating the spectral envelope of the input signal;

    (d) estimating the spectral envelope of the microphone signal;

    (e) applying the estimated input signal envelope to a filter to generate an estimate of the spectral envelope of a signal component in the microphone signal, wherein the signal component corresponds to sound generated by the speaker in response to the input signal and picked up by the microphone; and

    (f) suppressing the signal component in the microphone signal based on the estimated signal component envelope and the estimated microphone signal envelope to generate an output signal.

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