Automatic kinescope bias control system with digital signal proc

Details Automatic kinescope bias control system with digital signal proc Automatic kinescope bias control system with digital signal proc

1981-08-21

1983-06-07

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 27, 358 74, 358 34, H04N 568, H04N 920, H04N 9535

Patent

active

043874053

ABSTRACT:
Apparatus is disclosed in a video signal processing system for automatically monitoring and controlling the blanking (black) current level of an image reproducing kinescope. A kinescope cathode output signal proportional to the level of cathode black level current conduction is induced during periodic monitoring intervals during which image signals are absent. The cathode signal is induced in response to a grid drive pulse applied during the monitoring intervals. The induced cathode signal is processed by a digital signal processing network to produce incremental bias control voltage steps for modifying the cathode bias, if necessary, in a direction to produce a desired cathode black current level. In addition, there is disclosed a special form of grid drive pulse which serves to prevent system "hunting" in the vicinity of the correct cathode bias.

REFERENCES:
patent: 3558817 (1971-01-01), Avoort et al.
patent: 4012775 (1977-03-01), Smith
patent: 4263622 (1981-04-01), Hinn
patent: 4331982 (1982-05-01), Parker
Article, "Permanent Color Truth", by E. A. Jensen (from a publication by Bang and Olufsen, Denmark).
Report, "Towards True Color Stability in Television", by A. Lavigne (Videocolor S.A., Paris, France, No. 1600, Jun. 1978).
Article, "Color Receiver Design", by E. A. Jensen, (Wireless World, Jul. 1978).
Article by E. Gublass, ("Bildrohrenasteuerung . . . "), published in Funkschau, (1979, pp. 674-678).

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