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Noise reduction system

  • US 4,163,258 A
  • Filed: 12/21/1976
  • Issued: 07/31/1979
  • Est. Priority Date: 12/26/1975
  • Status: Expired due to Term
First Claim
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1. A method of reducing the noise of an input signal having components present in a give frequency spectrum, comprising the steps of deriving an orthogonal transform of said input signal, said orthogonal transform having n transformed signal components representing different respective portions of the frequency spectrum of said input signal;

  • suppressing those transformed signal components , other than the transformed signal component representing the lower portion of said frequency spectrum, whose signal levels are less than a threshold level; and

    reconverting said n transformed signal components, less said suppressed components, substantially into said input signal.

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