Method and apparatus for distinguishing aperiodic noise input si

Details Method and apparatus for distinguishing aperiodic noise input si Method and apparatus for distinguishing aperiodic noise input si

1972-09-29

1976-02-24

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G04B 1700

Patent

active

039396894

ABSTRACT:
A method and apparatus for detection whether an input signal is periodic or aperiodic, wherein reference pulses at a constant frequency are added during a first interval determined by a number of cycles of the input signal and reference pulses at the same frequency are substracted during a second interval determined by an equal number of cycles of the input signal. If the input signal is periodic, the counting result is zero or nearly zero since the counting intervals have been of equal duration. If the input signal is aperiodic, the counting result differs from zero because the counting intervals have not been of equal duration.

REFERENCES:
patent: 2931217 (1960-03-01), Wendt
patent: 3238764 (1966-03-01), Greiner
patent: 3370456 (1968-02-01), Jucker
patent: 3407645 (1968-10-01), Jucker
patent: 3678252 (1972-07-01), Payne
patent: 3777547 (1973-12-01), Izumi
patent: 3868845 (1975-03-01), Shimizu

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