Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1980-08-28
1982-02-16
Masinick, Michael A.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 39, 358160, 358166, H04N 576
Patent
active
043162100
ABSTRACT:
The luminance component of a video signal subject to overshoot is preemphasized and clipped prior to application as a modulating signal to a frequency modulator. Overshoot of the luminance signal, which tends to cause clipping distortion of the modulating signal is minimized by generating a compensating signal representative of the horizontal detail component of the luminance signal. The luminance signal is delayed relative to the compensating signal and subtractively combined therewith prior to application to the clipping circuitry such that the resultant modulating signal exhibits preshoot and reduced overshoot thereby minimizing the clipping distortion. Compensation is effectively disabled for luminance signal overshoots below the clipping level by means of an adjustable coring circuit in the compensating signal path whereby luminance signals exhibiting overshoot below the clipping level are not distorted by the compensating signal.
REFERENCES:
patent: 3872498 (1975-03-01), Pritchard
patent: 4057826 (1977-11-01), Baker
patent: 4096513 (1978-06-01), Ross
patent: 4219842 (1980-08-01), Miller
H. E. Ennes, "Television Broadcasting, Equipment, Systems, and Operating Fundamentals" Second Edition, 1979, p. 227.
Coalter R. G.
Masinick Michael A.
RCA Corporation
Tripoli J. S.
Whitacre E. M.
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