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Period detecting circuit

  • US 4,733,364 A
  • Filed: 02/19/1985
  • Issued: 03/22/1988
  • Est. Priority Date: 06/21/1983
  • Status: Expired due to Term
First Claim
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1. A period detecting circuit to which is supplied a pulse train to be measured and producing an output corresponding to its period comprising;

  • (a) multi-vibrating means receiving an input pulse train containing said pulse to be measured and generating an output pulse train having pulses delayed from the pulses of said input pulse train;

    (b) a function generator means controlled by said delayed pulse for generating a variable signal corresponding to the period of a pulse of said input pulse train;

    (c) first memory means for storing said variable signal from said function generator;

    (d) multiplying means for multiplying said variable signal by a predetermined set value greater than one with respect to time;

    (e) second memory means for storing the output from said multiplying means; and

    (f) comparing means for comparing outputs from said first and second means and for producing a stop mode detection output when the stored value in said first memory means becomes lower than the stored value in said second memory means.

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