Burst gate pulse generating circuit

Details Burst gate pulse generating circuit Burst gate pulse generating circuit

1989-06-26

1991-08-06

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

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358 19, H04N 9455

Patent

active

050382039

ABSTRACT:
A first circuit generates a first voltage which increases at a predetermined time constant in synchronism with the leading edge of a pulse contained in a sync signal. A second circuit compares the first voltage with a fixed second voltage. When the trailing edge of the pulse contained in the sync signal arrives at the first circuit before the increasing first voltage reaches the fixed second voltage, the first circuit stops generating the first voltage. A third circuit compares the first voltage with a fixed third voltage and a fixed fourth voltage which are higher than the fixed second voltage, and generates a train of burst gate pulses which become high in level after the first voltage exceeds the fixed third voltage, and low in level after the first voltage exceeds the fixed fourth voltage.

REFERENCES:
patent: 3585285 (1971-06-01), Rennick
patent: 3949418 (1976-04-01), Srivastava
patent: 4228456 (1980-10-01), Lovely
patent: 4410907 (1983-10-01), Vinekar

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