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Pattern recognition system using switched capacitors

  • US 4,483,017 A
  • Filed: 07/31/1981
  • Issued: 11/13/1984
  • Est. Priority Date: 07/31/1981
  • Status: Expired due to Fees
First Claim
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1. In a pattern recognition system the combination comprising:

  • a multiplexer having N inputs and an output, each one of said N inputs being adapted to receive an input signal;

    M band pass filters, each filter having a signal input connected to said multiplexer and a signal output, and each filter including a capacitor CF i and means for switching the capacitor at a particular frequency fF i for producing a desired particular equivalent resistance within each filter, where 1≦

    i≦

    M;

    means connecting said filter signal inputs to said multiplexer output;

    M integrators, one integrator per filter, each integrator having a signal input and a signal output and each integrator including a capacitor CI i and means for switching the capacitor at a particular frequency fI i for producing a desired particular equivalent resistance within each integrator;

    M rectifying means, one rectifying means per filter, each rectifying means being connected between the signal output of a filter and the signal input of an integrator;

    a summing amplifier having a summing node; and

    M weighting elements, one weighting element per integrator, each weighting element having a signal input and a signal output and including a capacitor CW i and means for switching the capacitor at a particular frequency fW i for producing a desired particular equivalent resistance in the signal path between said signal input and said signal output of each weighting element;

    means connecting the signal input of each weighting element to its corresponding integrator output; and

    means connecting the signal output of each weighting element to said summing node;

    where M and N are integers greater than one.

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