Average beam current limiter

Details Average beam current limiter Average beam current limiter

1977-05-05

1978-06-20

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358243, H04N 916

Patent

active

040965180

ABSTRACT:
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.

REFERENCES:
patent: 3578903 (1971-05-01), Willis
patent: 3980822 (1976-09-01), Suzuki et al.

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