Video signal processor with automatic kinescope beam current lim

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

1984-03-08

1986-12-30

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 74, H04N 568, H04N 916

Patent

active

046333207

ABSTRACT:
In a digital video signal processing system including an image reproducing kinescope and a digital-to-analog converter (DAC), excessive kinescope beam current 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.

REFERENCES:
patent: 4207591 (1980-06-01), Parker
patent: 4209808 (1980-06-01), Harwood
Selected pages from a technical bulletin of the Semiconductor Division of ITT Corporation, titled "DIGIT 2000 VLSI Digital TV System".

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