| 摘要 |
A system for automatically controlling the bias of a kinescope in a television receiver comprises a clamping reference network including an input coupling capacitor, and a sampling amplifier. Signals to be sampled are coupled from the clamping capacitor to the amplifier by a level shifting network for providing signals compatible with the input requirements of the amplifier. The level shifting network is non-conductive at all times except during the kinescope bias control intervals, thereby effectively decoupling the clamping capacitor to prevent its being discharged.
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