Auxiliary kinescope beam current limiter with plural cascaded lo

Details Auxiliary kinescope beam current limiter with plural cascaded lo Auxiliary kinescope beam current limiter with plural cascaded lo

1986-07-14

1987-08-25

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358243, H04N 920, H04N 568

Patent

active

046896686

ABSTRACT:
An auxiliary kinescope beam current limiter in a television receiver includes a control circuit responsive to a sensed signal representative of the combined instantaneous magnitudes of plural color video signals. The control circuit includes, in the order named, a first low pass filter, a first peak detector, a second low pass filter, and a second peak detector which provides a control signal to video signal processing circuits for limiting the amplitudes of the plural color video signals when a given amplitude threshold value is sensed as having been exceeded. The auxiliary beam current limiter is able to prevent warping or blistering of a shadow mask in a color kinescope due to scenes having a high beam current in, for example, an area equal to or greater than five to ten percent of the display screen area of the kinescope in both the horizontal and vertical directions.

REFERENCES:
patent: 4017681 (1977-04-01), Smeulers et al.
patent: 4096517 (1978-06-01), Hinn
patent: 4167025 (1979-09-01), Willis
patent: 4209808 (1980-06-01), Harwood
patent: 4253110 (1981-02-01), Harwood et al.
patent: 4451849 (1984-05-01), Fuhrer
patent: 4549217 (1985-10-01), Sendelweck
patent: 4562479 (1985-12-01), McDonald
patent: 4599643 (1986-07-01), Harlan

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