Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-10-01
1986-09-16
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358242, 358 34, 358 64, H04N 516
Patent
active
046125760
ABSTRACT:
A video processing and display system includes an image displaying kinescope, an AC coupled kinescope driver stage, and a system for automatically controlling the kinescope bias. During image blanking intervals the kinescope grid electrode is excited to induce a cathode output pulse related to the magnitude of the kinescope black current level. A DC restoration circuit responds to the induced pulse and provides to the kinescope a bias control signal related to the magnitude of the induced pulse, for maintaining a desired kinescope black current bias.
REFERENCES:
patent: 3647944 (1972-03-01), Anderson
patent: 4082996 (1978-04-01), Hinn
patent: 4263622 (1981-04-01), Hinn
patent: 4285008 (1981-08-01), Osawa et al.
patent: 4387405 (1983-06-01), Hinn
patent: 4549214 (1985-10-01), Hinn
Copending U.S. patent application Ser. No. 549,478 of W. Hinn filed 11/7/83, titled "Video Signal DC Restoration Circuit".
Copending U.S. patent application Ser. No. 532,333 of R. L. Rodgers, III, filed 5/31/83, titled "Brightness Control Network in a Video Signal Processor with AC Coupled Output Stages".
Emanuel P. M.
Groody James J.
Kurdyla R. H.
Rasmussen P. J.
RCA Corporation
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