Automatic kinescope bias control system compensated for sense po

Details Automatic kinescope bias control system compensated for sense po Automatic kinescope bias control system compensated for sense po

1982-10-14

1984-11-20

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 29, 358 65, 358243, H04N 568, H04N 9535

Patent

active

044842279

ABSTRACT:
In an automatic kinescope bias (AKB) control system, a signal with a magnitude representative of the black current level conducted by the kinescope of a television receiver is derived from a sense point. The derived signal is coupled via a signal path to a processing network including input clamping and sampling networks for developing a bias correction voltage. A source of auxiliary control signal, coupled to the signal path prior to the clamping network, is subject to being undesirably influenced by impedance variations manifested by the sense point. An impedance included in the signal path between the sense point and the auxiliary signal source compensates for the sense point impedance variations, and also increases the immunity of the clamping network to spurious signals including noise and locally generated interference.

REFERENCES:
patent: 4263622 (1981-04-01), Hinn
patent: 4319166 (1982-03-01), Lavigne
patent: 4331982 (1982-05-01), Parker
patent: 4387405 (1983-06-01), Hinn
patent: 4414577 (1983-11-01), Tallant

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