Plural sequential operating mode automatic kinescope beam curren

Details Plural sequential operating mode automatic kinescope beam curren Plural sequential operating mode automatic kinescope beam curren

1979-09-11

1981-02-24

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 74, H04N 568, H04N 514

Patent

active

042531217

ABSTRACT:
An automatic kinescope beam current limiter in a television receiver comprises a sensing network for deriving a signal representative of average and peak beam current demand directly from the video signal cathode current of the kinescope, and a control circuit responsive to the derived signal. When excessive average beam current is sensed, the control circuit supplies a control voltage for modifying the D.C. level (brightness level) of the video signal in a direction to limit beam current demand over a first range of average beam currents, and subsequently supplies a control voltage for reducing the peak amplitude (contrast level) of the video signal to limit beam currents over a second range of relatively greater average beam currents. Conversely, when excessive peak beam current is sensed, the control circuit supplies a control voltage for reducing the peak amplitude of the video signal to limit beam current demand over a first range of peak beam currents, and subsequently supplies a control voltage for modifying the D.C. level of the video signal in a direction to limit beam current demand over a second range of relatively greater peak beam currents.

REFERENCES:
patent: 3914545 (1975-10-01), Engel
patent: 4096518 (1978-06-01), Tuma et al.
patent: 4126884 (1978-11-01), Shanley
Motorola TDA 3300 Specification Sheet, Mar. 1979.
"Funkschau", Heft 12, 1979, pp. 675-678.

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