Signal processing network for an automatic kinescope bias...

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

H - Electricity

04

N

350/83

H04N 5/57 (2006.01) H04N 9/72 (2006.01)

Patent

CA 1206601

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.

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