Telegraphy – Systems – Printing
Patent
1974-07-30
1976-06-15
Heyman, John S.
Telegraphy
Systems
Printing
178DIG3, 307235A, 328179, 328180, 328186, 328187, 328188, H03K 513, H03K 402, H04N 504
Patent
active
039639916
ABSTRACT:
An apparatus for discriminating a peak level of a video signal, comprising a series circuit including a switch means, a discriminator with a video signal input, and at least one video signal peak clamping channel. This channel also comprises a series circuit which includes a coincidence circuit, a pulse counter, and a digital-analog converter, the first input of said coincidence circuit being connected to the output of the discriminator, the second input being connected to the output of said switch means, and the third input being connected to a timing pulse generator. The output of the digital-analog converter is connected to the input of said switch means.
REFERENCES:
patent: 3415950 (1968-12-01), Bartz et al.
patent: 3868477 (1975-02-01), Katzman
Olson, "Video Thresholding for Optical Scanners," IBM Tech. Discl. Bull., vol. 14, No. 4, 9/1971; pp. 1127-1128.
Pricer, "Artificial Generation of Grey Scales in Binary-Image Devices," IBM Tech. Discl. Bull., vol. 14, No. 4, 9/1971; p. 1086.
Alien Imant Karlovich
Khesin Arkady Yakovlevich
Nikonenko Anatoly Vasilievich
Popov Jury Olegovich
Yanson Boris Albertovich
Anagnos L. N.
Heyman John S.
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