Frequency-sensitive switching circuit and method

Details Frequency-sensitive switching circuit and method Frequency-sensitive switching circuit and method

1982-03-12

1983-12-06

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

328137, 328154, H04N 544

Patent

active

044196946

ABSTRACT:
A frequency-sensitive switching circuit includes a selectively-operable switch and a sampling circuit for controlling the switch. First and second signals are supplied to the switch. The first signal is also supplied to the sampling circuit, which senses the frequency of a series of pulses therein and compares such sensed pulse frequency with a set frequency. If the sensed pulse frequency is within the band width of the set frequency, the switch passes the first signal to an output terminal. If the sensed pulse frequency falls outside the band width of the set frequency, the switch passes the second signal to the output terminal.

REFERENCES:
patent: 4329675 (1982-05-01), Van Hulle
patent: 4361854 (1982-11-01), Wolfe

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