Burst gating signal generating circuit

Details Burst gating signal generating circuit Burst gating signal generating circuit

1977-12-22

1979-04-10

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

328139, H04N 946

Patent

active

041491807

ABSTRACT:
Disclosed herein are a circuit and a method for providing an appropriately-timed signal to the input of a chrominance burst gate. Horizontal synchronizing pulses are differentiated and clipped so that positive-going, exponentially decaying pulses are developed substantially coincidentally with the chrominance burst signal. The resultant pulses are then applied to one terminal of a switch. Horizontal flyback pulses are phase-delayed so that their peak amplitude occurs during the burst period. The phase-delayed pulses are applied to another terminal of the switch so that resultant pulses are shorted to ground except during a predetermined portion of the horizontal flyback period. As a result, a burst gating signal having a pulse width effectively equal to and coincident with the burst signal period is generated and applied to the input of the burst gate.

REFERENCES:
patent: 2726282 (1955-12-01), Bigelow
patent: 3024305 (1962-03-01), Wolfe
patent: 3544708 (1970-12-01), Buechel

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