Average beam current limiter

Details Average beam current limiter Average beam current limiter

H - Electricity

04

N

350/60

H04N 9/16 (2006.01) H04N 5/59 (2006.01)

Patent

CA 1096489

RCA 71,468 IMPROVED AVERAGE BEAM CURRENT LIMITER Abstract of the Invention An average beam current limiter for a kinescope responsive to video signals coupled to the kinescope via a signal transmission channel comprises a source of control signals representative of average current drawn by the kinescope. When average beam current exceeds a predetermined threshold level by an amount within a first range of beam current, a corresponding control signal is coupled to the signal transmission channel to vary the D.C. content of the video signal in a direction to limit beam current above the threshold level within the first range. When beam current exceeds the threshold level by a relatively greater amount within a second range of current, a corresponding control signal serves to vary the peak amplitude of the video signal to limit beam current within the second range.

302568

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