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In-wire selective active cancellation system

  • US 5,126,681 A
  • Filed: 10/16/1989
  • Issued: 06/30/1992
  • Est. Priority Date: 10/16/1989
  • Status: Expired due to Term
First Claim
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1. Active cancellation system for cancelling undesirable repetitive signal components from a primary electronic signal containing desired intelligent signal components and undesirable repetitive signal components, comprising:

  • an electronic mixer producing a mixer output signal and a residual signal representation of the residual error in the mixer output signal,primary signal input means conducting the primary electronic signal as an input signal to the electronic mixer, a timing generator generating a timing signal related to the frequencies of the undesired repetitive signal components,selective active cancellation controller means receiving said timing signal from said timing signal generator and developing a repetitive cancellation signal for supply as a second input signal to the electronic mixer, andoperator interface control means operatively connected to said selective active cancellation controller means for accommodating control of a range of frequencies within which the harmonics of desired fundamental frequency are to be cancelled,wherein said electronic mixer includes means for combining the primary electronic signal and the cancelling signal to produce the mixer output signal, the cancelling signal cancelling the undesirable repetitive signal components from the primary electronic signal while permitting passage of the desired intelligent signal components as the mixer output signal.

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