| 摘要 |
PURPOSE:To improve the quality of the B/W picture, by switching the operation of the first video signal path including the chroma trap and the delay line and the second video signal path, which does not include them, at the color receiving time and the B/W receiving time. CONSTITUTION:The first video signal path including the video first amplifier, the trap incorporating Y delay line, and the video second amplifier and the second video signal path including the video first amplifier and the B/W video amplifier are provided. Further, switch circuit 8 which is operated by the killer voltage is provided, and the first and the second video signal paths are controlled by this switch 8. By the control of switch 8, the video signal is processed by the first signal path, which includes the first amplifier, the Y delay line, and the second amplifier, at the color receiving time to output the video signal, and the video signal is processed by the second signal path, which includes the first amplifier and the B/W video amplifier, at the B/W receiving time, thus improving the quality of the B/W picture signal. |
