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Harmonic-series filter

  • US 6,904,443 B2
  • Filed: 08/13/2001
  • Issued: 06/07/2005
  • Est. Priority Date: 08/13/2001
  • Status: Expired due to Fees
First Claim
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1. A filtering system comprising:

  • a first input that receives a signal contaminated with noise;

    a second input that receives a noise reference signal;

    a set of M notch filters, wherein each of the M notch filters is responsive to a corresponding tuning coefficient so as to attenuate a corresponding noise frequency in the signal contaminated with noise;

    a tuning parameter generator coupled to the second input, wherein the tuning parameter generator is arranged to generate a tuning parameter corresponding to a fundamental frequency of the noise based on the noise reference signal;

    a filter coefficient generator coupled to the tuning parameter generator and to each of the M notch filters, wherein the filter coefficient generator is responsive to the tuning parameter so as to provide each of the M notch filters with the corresponding tuning coefficient; and

    , a gain normalizer coupled to the M notch filters and to the first input, wherein the gain normalizer is arranged to adjust an overall gain of the M notch filters.

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