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RATE DECODER WITH ACTIVE FILTERS

  • US 3,715,579 A
  • Filed: 10/22/1970
  • Issued: 02/06/1973
  • Est. Priority Date: 10/22/1970
  • Status: Expired due to Term
First Claim
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1. A decoding system for providing a control signal in response to an input of one of a plurality of selected code rates, each of said code rates coded to designate a restrictive control signal varying from a most restrictive control signal to a least restricted control signal, wherein the improvement comprises:

  • a plurality of band-pass filtering means, each of said band-pass filtering means responsive to a code rate input for producing an output when the input is within the band of each of said filter means;

    a plurality of comparator means each having a triggering level responsive to a corresponding one of said filter means output for producing a step signal when the amplitude of said corresponding filtering means output exceeds said triggering level;

    said comparator including an amplifier triggered fOr producing its step output each time said filter output exceeds the triggering level, and cut-off for terminating the step output each time said filter output is less than said trigger level, thereby producing substantially a square wave output having a frequency in accordance with said code rate a plurality of output means, each output means coupled to a corresponding one of said comparator means for producing an output control signal when the corresponding one of said square wave outputs exceeds a minimum frequency; and

    a restrictive circuit having parallel inputs from each of said band-pass filtering means and switching means governed by said output control signals from said output means, said restrictive circuit providing means for conducting only the output from said band-pass filtering means corresponding to the most restrictive control signal.

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