Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1990-08-02
1992-03-03
Groody, James J.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358184, 315403, H04N 568, H04N 5228
Patent
active
050937286
ABSTRACT:
In a 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 driver amplifier performs a coring operation that 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: 4309725 (1982-01-01), Groeneweg
patent: 4314184 (1982-02-01), Ryan
patent: 4639785 (1987-01-01), Tallant, II et al.
patent: 4642533 (1987-02-01), Carpenter
patent: 4994756 (1991-02-01), Brilka
Schematic of SVM circuitry for Toshiba color television receiver Model No. 30ID1, published in the magazine "Gijutsu," Oct. 1988 issue, p. 301.
Article from "Best of the Expander vol. II," entitled Scan Velocity Modulation--Making It Crisp Around the Edges!, 1988, pp. 74-79.
U.S. patent application Ser. No. 562,006, M. R. Anderson, filed Aug. 2, 1990 entitled Beam Scan Velocity Modulation Apparatus with Disabling Circuit.
Groody James J.
Laks Joseph J.
Murrell Jeffrey S.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
LandOfFree
Beam scan velocity modulation apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Beam scan velocity modulation apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Beam scan velocity modulation apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-276314