Noise detecting circuit and television receiver employing the sa

Details Noise detecting circuit and television receiver employing the sa Noise detecting circuit and television receiver employing the sa

1982-02-22

1985-01-29

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 508

Patent

active

044969783

ABSTRACT:
A noise detecting circuit in a television receiver, which comprises a horizontal synchronizing signal separating circuit (17) for separating a horizontal synchronizing signal from a detected composite video signal, a differential circuit (101) for extracting a noise component included in the horizontal synchronizing signal period of the composite video signal as a function of the separated horizontal synchronizing signal, and a rectifying circuit (102) for rectifying the extracted noise component for providing a direct current voltage associated with the magnitude of the noise component in the composite video signal. The noise detected output is applied to an automatic frequency control circuit (26) for the purpose of controlling the sensitivity of an automatic frequency control operation thereof. The noise detected output is also applied to the automatic frequency control circuit (26) for the purpose of controlling the impedance of a filter thereof. Synchronization of a horizontal output signal with the horizontal synchronizing signal is also detected and the control of the automatic frequency control circuit (26) responsive to the noise detected output is disabled responsive to a non-synchronization detected output and the sensitivity of the automatic frequency control circuit (26) and the impedance of the filter thereof are also controlled responsive to the non-synchronization detected output.

REFERENCES:
patent: 3207844 (1965-09-01), Massman
patent: 3334182 (1967-08-01), Legler
patent: 4042959 (1977-08-01), Klein
patent: 4204219 (1980-05-01), Uchida
patent: 4212032 (1980-07-01), Harford
patent: 4376952 (1983-03-01), Troiano

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