Noise suppression circuit

Details Noise suppression circuit Noise suppression circuit

1976-05-07

1977-08-16

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358157, 358177, H04N 544, H04N 521

Patent

active

040429598

ABSTRACT:
A noise suppression circuit for suppressing or cancelling noise pulses in a composite video signal coupled to television receiver synchronizing pulse separator and automatic gain control circuits is shown. Noise pulses in the video signal exceeding the amplitude of the synchronizing pulses are detected. The detected noise pulses are direct current coupled to the synchronizing pulse separator circuit and alternating current coupled to the automatic gain control circuit to inhibit hang-up of the automatic gain control system. The reference level for detecting the noise pulses is gated to inhibit detection of synchronizing pulses. The noise detecting reference level is also derived from the automatic gain control reference level.

REFERENCES:
patent: 3582551 (1971-06-01), Krug
patent: 3806646 (1974-04-01), Hofmann

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