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Filter which tracks changing frequency of input signal

  • US 3,978,416 A
  • Filed: 04/30/1975
  • Issued: 08/31/1976
  • Est. Priority Date: 04/30/1975
  • Status: Expired due to Term
First Claim
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1. A band-pass filter having a pass band which tracks the changing frequency of an input signal, comprisinga voltage-controlled filter including a signal input terminal, a signal output terminal and a frequency control terminal,a trigger circuit connected to said signal output terminal to translate the sine wave passed through said filter to a pulse wave,a converter receptive to said pulse wave and operative repeatedly to translate the period between successive pulses to a frequency-representing voltage, andmeans to apply said frequency-representing voltage to the frequency control terminal of said voltage-controlled filter.

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