Signal processing network for an automatic kinescope bias contro

Details Signal processing network for an automatic kinescope bias contro Signal processing network for an automatic kinescope bias contro

1982-10-14

1984-11-20

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 74, H04N 568, H04N 916

Patent

active

044842287

ABSTRACT:
An automatic kinescope bias (AKB) control system includes a sampling amplifier which provides an output current for charging and discharging a storage capacitor in response to the amplitude of a derived pulse representative of the black current level conducted by the kinescope of a television receiver. The derived pulse amplitude is greater than zero when the black current level is correct, and is applied to the amplifier via an input signal coupling path. During sampling intervals, an auxiliary pulse is applied to the input signal path with a magnitude and sense for negating the amplitude of the derived pulse at the amplifier input when the derived pulse amplitude corresponds to the correct black current level. Accordingly, the amplifier conduction and the voltage on the storage capacitor remain unchanged.

REFERENCES:
patent: 3872395 (1975-03-01), Holland
patent: 4055777 (1977-10-01), Black
patent: 4112460 (1978-09-01), Arnsson
patent: 4207592 (1980-06-01), Harwood
patent: 4263622 (1981-04-01), Hinn
patent: 4277798 (1981-07-01), Hinn
patent: 4331981 (1982-05-01), Parker
patent: 4331982 (1982-05-01), Parker
patent: 4414577 (1983-11-01), Tallant et al.
patent: 4450476 (1984-05-01), Tallant

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