Automatic kinescope beam current limiter with sequential control

Details Automatic kinescope beam current limiter with sequential control Automatic kinescope beam current limiter with sequential control

1979-12-14

1981-02-24

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 39, 358168, 358169, 358243, H04N 9535, H04N 558

Patent

active

042531101

ABSTRACT:
An automatic kinescope beam current limiter for a television receiver comprises a source of signal representative of kinescope beam current conduction, a first transistor responsive to the representative signal over first, second and third ranges of excessive beam currents above a threshold level, and a second transistor. A first control signal derived from the first transistor modifies the video signal peak-to-peak amplitude (contrast level) when beam currents above the threshold level occur. The output of the first transistor is selectively coupled to an input of the second transistor when beam currents beyond the first range occur. A second control signal derived from the second transistor modifies the video signal D.C. component (brightness level) to limit beam currents beyond the first range, whereby both the peak amplitude and D.C. components are modified over the second range. The first control signal is clamped to a fixed level in response to beam currents beyond the second range, whereby the video signal D.C. component is modified alone to limit beam currents over the third range.

REFERENCES:
patent: 4096518 (1978-06-01), Tuma
patent: 4126884 (1978-11-01), Shanley

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