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System and method for providing noise suppression utilizing null processing noise subtraction

  • US 9,185,487 B2
  • Filed: 06/30/2008
  • Issued: 11/10/2015
  • Est. Priority Date: 01/30/2006
  • Status: Active Grant
First Claim
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1. A method for suppressing noise, comprising:

  • receiving at least a primary acoustic signal from a primary microphone and a secondary acoustic signal from a different, secondary microphone;

    applying a coefficient to the primary acoustic signal to generate a desired signal component, the coefficient representing a source location, the desired signal component not being a function of the secondary acoustic signal;

    subtracting the desired signal component from the secondary acoustic signal to obtain a noise component signal;

    performing a first determination of at least one energy ratio related to the desired signal component and the noise component signal;

    performing a second determination of whether to adjust the noise component signal based on the at least one energy ratio;

    adjusting the noise component signal based on the second determination;

    subtracting the adjusted noise component signal from the primary acoustic signal to generate a noise subtracted signal; and

    outputting the noise subtracted signal.

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