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ACTIVE NOISE CONTROL USING VARIABLE STEP-SIZE ADAPTATION

  • US 20180240452A1
  • Filed: 02/23/2017
  • Published: 08/23/2018
  • Est. Priority Date: 02/23/2017
  • Status: Active Grant
First Claim
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1. A method that actively cancels noise in a vehicle using a plurality of microphones and a plurality of loudspeakers comprising:

  • generating one or more control output signals to drive the plurality of loudspeakers; and

    adapting a plurality of control coefficients of a control filter based on a plurality of secondary path transfer functions that model the acoustic paths between each loudspeaker and each microphone of the plurality of microphones;

    where the rate the plurality of control coefficients of the control filter adapt is time-varying and frequency dependent; and

    where the rate the plurality of control coefficients of the control filter adapt is based on an adaptive step size based on a predetermined secondary acoustic path.

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