Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1992-01-27
1993-03-23
Groody, James J.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358184, 358167, 315387, H04N 332
Patent
active
051969416
ABSTRACT:
In beam scan velocity modulation (SVM) system for a television receiver, a video signal is applied to a differentiator followed by a limiting differential amplifier. A driver amplifier coupled to the limiting amplifier drives an output stage that supplies current to an SVM coil. Certain video signals with large high frequency content may tend to produce excessive dissipation in the devices of the output stage. To prevent this, a current source for the differential amplifier is controlled by a voltage which is a measure of the average current through the output stage. The magnitude of the current source is varied to thereby vary the peak-to-peak signal output from the limiting amplifier to prevent overdissipation of the output devices. The presence of random noise in the video signal can produce unwanted SVM operation which can impair the viewed image. The unwanted noise component in the video signal can be reduced in amplitude by coring. The coring is unaffected by the variable limiting.
REFERENCES:
patent: 4170785 (1979-10-01), Yoshida et al.
patent: 4183064 (1980-01-01), Sahara et al.
patent: 4185301 (1980-01-01), Mitsuda et al.
patent: 4261014 (1981-04-01), Lee
patent: 4309725 (1982-01-01), Groeneweg
patent: 4314184 (1982-02-01), Ryan
patent: 4639785 (1987-01-01), Tallant et al.
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patent: 4994756 (1991-07-01), Brilka
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Schematic of SVM circuitry for Toshiba color television receiver model No. 30ID1, published in the magazine Gijutsu, Oct. 1988 p. 301.
Article from "Best of the Expander vol. II", entitled Scan Velocity Modulation--Making It Crisp Around The Edges!, 1988, pp. 74-79.
"TV-Video Schematic Diagrams," published 1990 by Dempa Shimbun, p. 387--National TH-29Xl and p. 389--National TH--37X1.
Davenport Francis A.
Groody James J.
Laks Joseph J.
Murrell Jeffrey
RCA Licensing Corporation
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