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Distortion-cancellation circuit for audio peak limiting

  • US 5,168,526 A
  • Filed: 10/29/1990
  • Issued: 12/01/1992
  • Est. Priority Date: 10/29/1990
  • Status: Expired due to Term
First Claim
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1. In an audio peak limiting apparatus, an improvement for reducing distortion comprising:

  • a clipper coupled to receive an input audio signal;

    a differencing means coupled to receive said input audio signal and the output of said clipper, for providing a signal representative of the clippings from said input audio signal;

    a band-pass filter coupled to said output of said clipper;

    a voltage-controlled amplifier for amplifying low-frequencies in said input audio signal;

    control signal generation means coupled to said differencing means for generating a control signal for said amplifier, said control signal representing a direct current level and low-frequency spectral energy in said signal representative of said clippings, said control signal coupled to said amplifier such that less amplification occurs as said low-frequency spectral energy increases;

    combining means for combining the outputs of said band-pass filter and said amplifier to provide an output signal.

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