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Echo canceler circuit and method

  • US 7,680,265 B2
  • Filed: 12/12/2003
  • Issued: 03/16/2010
  • Est. Priority Date: 12/12/2003
  • Status: Active Grant
First Claim
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1. A method of reducing echoes and noise in data, the method comprising:

  • receiving data;

    linearly filtering the data to produce pre-noise suppression data;

    removing noise from the pre-noise suppression data to provide noise suppressed data;

    dynamically determining at least one weighted filter coefficient using at least in part the pre-noise suppression data and not the noise suppressed data, the determining occurring independently from and not being affected by removing the noise from the pre-noise suppression data;

    wherein removing the noise occurs independently from and is not affected by dynamically determining the at least one weighted coefficient such that the noise is removed without encountering an artificial variation in a noise floor; and

    subsequently filtering echoes from the noise suppressed data using the at least one weighted filter coefficient to produce final data, the final data being substantially free of noise and substantially free of echoes.

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