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NOISE CANCELLATION SYSTEM WITH LOWER RATE EMULATION

  • US 20100310086A1
  • Filed: 12/12/2008
  • Published: 12/09/2010
  • Est. Priority Date: 12/21/2007
  • Status: Active Grant
First Claim
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1. A noise cancellation system, comprising:

  • an input for a digital signal, the digital signal having a first sample rate;

    a digital filter, connected to the input to receive the digital signal;

    a decimator, connected to the input to receive the digital signal and to generate a decimated signal at a second sample rate lower than the first sample rate; and

    a processor, wherein the processor comprises;

    an emulation of the digital filter, connected to receive the decimated signal and to generate an emulated filter output; and

    a control circuit, for generating a control signal on the basis of the emulated filter output,wherein the control signal is applied to the digital filter to control a filter characteristic thereof.

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