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WAVE GENERATOR HAVING FREQUENCY-DEPENDENT TRIGGER LEVEL FOR CORRECTION OF LOOP DELAY

  • US 3,617,769 A
  • Filed: 03/12/1969
  • Issued: 11/02/1971
  • Est. Priority Date: 03/12/1969
  • Status: Expired due to Term
First Claim
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1. Signalling apparatus comprising:

  • integrator means having an input and an output;

    source means connected to the input of said integrator means for applying signal thereto of selected amplitude and polarity in response to control signal applied thereto;

    circuit means including a pair of trigger circuits connected to apply control signal to said source means for reversing the polarity of signal applied to said integrator means in response to the amplitude of the signal appearing at the output of said integrator means attaining selected upper and lower trigger levels which are altered in response to a level-adjusting signal applied thereto; and

    level-control means connected to apply to said circuit means for altering the trigger level thereof a level-adjusting signal which is representative of the delay in said source means reversing the polarity of signal applied to said integrator means, the level-control means including for each of said trigger circuits a peak detector responsive to a selected one of the upper and lower peak amplitudes of the signal appearing at the output of said integrator means for decreasing the respective one of said upper and lower trigger levels in response to increase in the corresponding one of the upper and lower peak amplitudes of the signal appearing at the output of said integrator means.

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