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Noise reducing system

  • US 4,296,436 A
  • Filed: 08/21/1979
  • Issued: 10/20/1981
  • Est. Priority Date: 08/21/1978
  • Status: Expired due to Term
First Claim
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1. A noise reducing system comprising first circuit means for detecting a variation of a picture from an input picture signal and a past picture signal by mixing said signals with a selectively variable ratio;

  • second circuit means for controlling the mixing ratio between the input picture signal and the past picture signal in response to an output signal of said first circuit means; and

    memory circuit means for delaying the output of said second circuit means a fixed time period to provide said past picture signal;

    said second means comprising movement detector circuit means for detecting displacement of the variation of the picture per frame from the output of said memory circuit means and the output of said first circuit means, and movement compensator circuit means coupled between said memory circuit means and said first circuit means and controlled by an output of said movement detector circuit means for generating and providing to the first circuit means a past picture signal which corresponds to the same area as the input picture signal.

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