1969-04-02
1976-12-21
Heyman, John S.
328140, 328 48, H03K 906
Patent
active
039991369
ABSTRACT:
A circuit for detecting the occurrence of incoming pulses at a predetermined repetition rate while remaining unresponsive to pulses occurring at an even harmonic of such rate, the circuit including a clock pulse generator and resettable counter arranged to count the pulses produced by the generator and to produce an output representing its current count, resetting means for resetting the counter to its "0" count state when an incoming pulse arrives at a time after the arrival of a preceding pulse which started the clock pulse generator which is equal to or greater than the time between pulses occurring at the repetition frequency to be detected, signal producing means for producing an output signal only when the time of arrival between such incoming pulses is equal to the time between pulses at the repetition frequency to be detected, and output signal suppressing means arranged to prevent the production of an output signal when an incoming pulse arrives at a time after the arrival of an incoming pulse which started the clock pulse generator equal to one-half the time between incoming pulses occurring at the repetition frequency to be detected. The clock pulse generator has a preferably variable repetition frequency which is a multiple of the repetition frequency to be detected.
REFERENCES:
patent: 3413449 (1968-11-01), Brown
Lang, Jr. Milton R.
O'Berry William A.
Wise Carl D.
Henson F. H.
Heyman John S.
Westinghouse Electric Corporation
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