Burst gating signal generating circuit

Details Burst gating signal generating circuit Burst gating signal generating circuit

1979-06-20

1980-10-14

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

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H04N 946

Patent

active

042284562

ABSTRACT:
A circuit for generating an accurately-timed noise-free signal for gating the chrominance burst portion of the composite video signal. The horizontal sync pulses are differentiated and clamped to the horizontal blanking pulses. The output pulses are then applied to a gating diode that is conductive only when those pulses have an amplitude above a predetermined bias level. The resultant pulses are coupled to the input of a burst gate so that the gate is open only for a period of time substantially coterminous with the burst period.
The burst gate is thereby rendered immune to noise signals occurring during the active line period and the accuracy of the gating signal is independent of the television receiver's horizontal time base.

REFERENCES:
patent: 3544708 (1970-12-01), Buechel
patent: 4149180 (1979-04-01), Lovely

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