Video signal processor with automatic kinescope beam current...

Details Video signal processor with automatic kinescope beam current... Video signal processor with automatic kinescope beam current...

H - Electricity

04

N

350/79

H04N 5/16 (2006.01) H04N 3/20 (2006.01) H04N 9/64 (2006.01)

Patent

CA 1228159

ABSTRACT In a digital video signal processing system including an image reproducing kinescope and a digital-to-analog converter (DAC), excessive kinescope beam currents are automatically limited in response to a control signal which varies a reference voltage for the DAC such that the peak-to-peak amplitude of analog video signals from the DAC is reduced. A version of the control signal is applied to the output of the DAC with a magnitude and polarity for substantially negating unwanted shifts of the video signal black level during the beam current limiting mode.

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