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Method and device for noise reduction control using microphone array

  • US 8,942,976 B2
  • Filed: 12/15/2010
  • Issued: 01/27/2015
  • Est. Priority Date: 12/28/2009
  • Status: Active Grant
First Claim
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1. A noise reduction method using a microphone array, characterized by comprising steps of:

  • S1;

    collecting, by the microphone array, acoustic signals;

    S2;

    estimating incidence angles of all acoustic signals collected by the microphone array, and;

    distinguishing between target speech components and noise components based on the incidence angles, wherein the target speech components have incidence angles within an angle of protection, and wherein the noise components have incidence angles outside the angle or protection;

    S3;

    conducting a statistics on signal components according to the incidence angles;

    S4;

    determining a control parameter α

    from a ratio of noise components according to the statistical result and using the parameter α

    as a control parameter for updating an adaptive filter for reducing noise from the collected acoustic signals,wherein the more noise components, the larger the control parameter α

    , and the faster the updating of the adaptive filter,wherein when all the collected acoustic signals are noise components, α

    is determined to be 1, and the adaptive filter conducts the fastest update to suppress noise, andwherein when all the collected acoustic signals are target speech components, α

    is determined to be 0, and the adaptive filter stops updating weights of the filter to protect the target speech components from being damaged.

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