Method and circuit for nonlinear transmission-processing of a vi

Details Method and circuit for nonlinear transmission-processing of a vi Method and circuit for nonlinear transmission-processing of a vi

1987-06-10

1989-01-10

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 32, 358 34, 358168, 358169, 358171, 358172, 358174, 358176, H04N 520, H04N 516

Patent

active

047977442

ABSTRACT:
A gamma stage of a television camera is automatically provided with regulation removing effect of variations in temperature, supply voltage and the like by means of two series of control pulses added to the video signal in blanking intervals of the signal before processing by the gamma stage. One series of pulses inserted in the horizontal blanking intervals, is compared after passing through the circuit with a reference value in a gated comparison amplifier providing a constant voltage output for the duration of a horizontal scanning interval, which is utilized to correct the d.c. offset of the video signal before it enters the gamma stage. Another set of control pulses inserted in the vertical blanking intervals is supplied to a gated comparison amplifier to produce an output signal that remains constant for a vertical scanning interval, which is used to provide a multiplicative correction to the output of the gamma stage for controlling the amplification of the circuit as a whole. The output of the multiplicative correction stage proceeds to the usual circuit for d.c. level clamping in the horizontal blanking intervals to produce the output available for further processing, which is also utilized by the comparison amplifiers for regulation purposes.

REFERENCES:
patent: 4202009 (1980-05-01), Ushiyama et al.
patent: 4249208 (1981-03-01), Haenen et al.
patent: 4625240 (1986-11-01), Yablonski et al.
patent: 4651210 (1987-03-01), Olson
patent: 4682231 (1987-07-01), Yamakawa
patent: 4686562 (1987-08-01), Yamanaka
patent: 4701786 (1987-10-01), Yamanaka

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