Kinescope black level current sensing apparatus

Details Kinescope black level current sensing apparatus Kinescope black level current sensing apparatus

1982-07-01

1984-07-31

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 33, 358 65, 358165, H04N 568, H04N 324, H04N 920, H04N 324

Patent

active

044633858

ABSTRACT:
In a television receiver including an automatic kinescope bias (AKB) control system, a kinescope cathode is driven by a video output amplifier. A feedback network is provided from the output to the input of the amplifier. A sensing resistor is included in the main current conduction path of the amplifier. During AKB operating intervals, a cathode output signal proportional to the cathode black current level is coupled via the feedback network for varying the amplifier conduction such that a voltage developed across the sensing resistor is proportional to the black current representative cathode output signal. This voltage is utilized to control the cathode bias to maintain a desired black current level.

REFERENCES:
patent: 4012775 (1977-03-01), Smith
patent: 4160995 (1979-07-01), Jensen
patent: 4207592 (1980-06-01), Harwood
patent: 4224640 (1980-09-01), Hovens et al.
patent: 4237479 (1980-12-01), Lavigne
patent: 4263622 (1981-04-01), Hinn
patent: 4277798 (1981-07-01), Hinn
patent: 4319166 (1982-03-01), Lavigne
patent: 4387405 (1983-06-01), Hinn
An article "Permanent Color Truth"--E. A. Jensen (from a publication by Bang & Olufsen, Denmark).
An article "Color Receiver Design"--E. A. Jensen (Wireless World, Jul. 1978).

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