Dual intensity video circuit

Details Dual intensity video circuit Dual intensity video circuit

1985-09-11

1987-10-06

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358174, 340793, H04N 5235

Patent

active

046986812

ABSTRACT:
A dual intensity video highlight circuit for enabling a maximum brightness display on a CRT includes a cascode connection of a video output transistor and a video driver transistor with the video driver transistor having a pair of series connected resistors in its emitter circuit. A character generator supplies pulse signals of different amplitudes to the video driver transistor, which inverts the signals. The inverted signals are amplified by the video output transistor and supplied to drive the CRT. A video intensifier transistor has its emitter collector junction connected across one of the emitter resistors for shorting out that resistor, responsive to a control signal, for changing the gain of the video output transistor to permit a maximum brightness display for highlighting.

REFERENCES:
patent: 3389222 (1968-06-01), Schoen
patent: 4013833 (1977-03-01), Zimmerman
patent: 4091419 (1978-05-01), Rhee
patent: 4270126 (1981-05-01), Bafaro
patent: 4355334 (1982-10-01), Fitzgibbon
patent: 4598316 (1986-07-01), Rogers

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