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Adaptive LPC noise reduction system

  • US 8,447,044 B2
  • Filed: 05/17/2007
  • Issued: 05/21/2013
  • Est. Priority Date: 05/17/2007
  • Status: Active Grant
First Claim
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1. A noise suppression system comprising:

  • a sampling circuit adapted to sample an audio input signal at a predetermined sampling rate;

    a low-pass filter coupled with the sampling circuit and configured to pass low-frequency components of the sampled audio input signal;

    a plurality of delay circuits configured to sequentially delay the low-frequency components of the sampled audio input signal to provide sequentially delayed signals;

    an adaptive processor configured to process the sequentially delayed signals and update a plurality of linear predictive coefficient (LPC) values on a sample-by-sample basis, based on an error signal, where the error signal is based on a difference between an output of the low-pass filter and an output of the adaptive processor; and

    a decision logic device coupled with the adaptive processor and configured to inhibit an update of the LPC values applied to a portion of the sampled audio input signal based on a determination that a wind buffet is not present in the portion of the sampled audio input signal;

    a high-pass filter coupled with the sampling circuit and configured to pass high-frequency components of the sampled audio input signal; and

    an adder configured to sum the error signal and an output of the high-pass filter to generate an output signal.

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