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Digital filters for remote control receivers

  • US 4,653,016 A
  • Filed: 09/23/1983
  • Issued: 03/24/1987
  • Est. Priority Date: 10/01/1982
  • Status: Expired due to Fees
First Claim
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1. A digital filter for remote control receivers which operates in response to control signals at a predetermined input frequency superimposed on a power supply voltage, comprising first and second digital filter stages of the second order connected in cascade, each of said first and second digital filter stages including means for positioning the zeros in the pass-band of the filter stage so as to reduce the resonant frequency amplification of the filter wherein the filter coefficients of each filter stage are such that the zeros in the pass-band of the filter are positioned in terms of frequency, between + and -50% of the resonant frequency (fg) adjacent thereto by placing conjugate complex zeros on the circle of unit radius of the z-plane.

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