Gated automatic beam current limiter in a video signal processin

Details Gated automatic beam current limiter in a video signal processin Gated automatic beam current limiter in a video signal processin

1978-02-09

1980-06-10

Cook, Daryl W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 74, 358243, H04N 516, H04N 916, H04N 568

Patent

active

042075912

ABSTRACT:
In a video signal processing system including a clamp for clamping the video signal to a reference level during periodic image blanking intervals of the video signal, and a kinescope for reproducing an image in response to the clamped video signal, apparatus for automatically limiting excessive beam currents drawn by the kinescope. A derived control signal representative of the magnitude of excessive beam currents is applied to the video signal processing path prior to the clamp. The control signal is inhibited during the blanking intervals, and serves to offset the D.C. level of the video signal in the black direction during image trace intervals to reduce the current conduction of the kinescope.

REFERENCES:
patent: 3562409 (1971-02-01), Freeman et al.
patent: 3735029 (1973-05-01), Sunstein
patent: 3898381 (1973-08-01), Amsen et al.
patent: 4067048 (1978-01-01), Norman
patent: 4096518 (1978-06-01), Tuma et al.

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