Video image blanking signal generator

Details Video image blanking signal generator Video image blanking signal generator

1985-09-23

1987-03-24

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358150, H04N 324

Patent

active

046529209

ABSTRACT:
A video monitor includes apparatus for generating a horizontal blanking pulse accurately timed with respect to a horizontal image retrace interval. The leading edge of the blanking pulse is derived from a differentiated horizontal oscillator signal which is applied to one input of a gate having a threshold operating level. The lagging edge of the blanking pulse is generated when the amplitude of a horizontal flyback pulse applied to another input of the gate falls below the gate threshold level.

REFERENCES:
patent: 4213151 (1980-07-01), Harford
patent: 4228464 (1980-10-01), Duijkers
Schematic Circuit Diagram of Tektronix Model 690 SR Video Monitor.

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