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Signal filter method and apparatus

  • US 4,453,218 A
  • Filed: 11/24/1980
  • Issued: 06/05/1984
  • Est. Priority Date: 11/24/1980
  • Status: Expired due to Term
First Claim
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1. A method for filtering a signal including the steps ofreceiving the signal,generating a base line representation,varying the base line representation by a predetermined amount to adjust the base line representation toward the signal,determining a threshold representation related to the base line representation,comparing the signal with the threshold representation,transmitting the signal if the signal is less than the threshold representation, andtransmitting a predetermined output if the signal is greater than the threshold representation.

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