Video signal processing circuitry for compensating different ave

Details Video signal processing circuitry for compensating different ave Video signal processing circuitry for compensating different ave

1978-08-28

1979-11-20

Lucas, Jay P.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

358174, H04N 584, H04N 514

Patent

active

041752724

ABSTRACT:
Video signal processing circuitry for compensating a video signal having different average levels in alternate horizontal line intervals, such as in odd and even line intervals during a field or frame interval. A first average detector is operable during alternate ones of the line intervals, for example, during odd line intervals, for detecting the average level of the video signal in such alternate line intervals. A second average detector is operable during the remaining ones of the line intervals, for example, during the even line intervals, for detecting the average level of the video signal in such remaining line intervals. A compensating circuit is responsive to the difference between the detected average levels of the video signal in the alternate and remaining line intervals, respectively, for producing compensating signals. These compensating signals are combined with the video signal so as to minimize the difference between the average level of the video signal in successive line intervals.

REFERENCES:
patent: 3483318 (1969-12-01), Iwai
patent: 3610819 (1971-10-01), Thompson
patent: 3614308 (1971-10-01), Iwai
patent: 3651339 (1972-03-01), Herrmann
patent: 3716670 (1973-02-01), Lowry
patent: 3904818 (1975-09-01), Kovac
patent: 3969759 (1976-07-01), Amery
patent: 4001496 (1977-01-01), Clemens
patent: 4038688 (1977-07-01), Chow

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