| 摘要 |
<p>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.</p> |
