Undesired signal canceller

Details Undesired signal canceller Undesired signal canceller

1976-06-22

1978-03-28

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358905, 325477, H04N 521, H04B 110

Patent

active

040818373

ABSTRACT:
An undesired signal canceller for a composite amplitude modulated signal including an undesired signal delayed by a time .tau..sub.o from a desired signal. The composite signal is supplied to a detector circuit. A carrier signal of the same frequency as that of the amplitude modulated carrier and delayed in phase by the time .tau..sub.o is produced. This carrier signal is amplitude modulated with a signal formed by delaying the output signal from the detector circuit by the time .tau..sub.o, and the amplitude modulated carrier signal is combined with the composite amplitude modulated signal to cancel the undesired signal therefrom.

REFERENCES:
patent: 2448635 (1948-09-01), Smith
patent: 3213450 (1965-10-01), Goor

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