| 摘要 |
PURPOSE:To reduce buzz interference, by providing a slope of a video IF selective characteristic near by a video carrier wave a filter having the slope equal in the absolute value but opposite in the polarity near by the video carrier wave between a video intermediate frequency amplifier and an voice detector. CONSTITUTION:To compensate the phase modultion phi produced at a video carrier, a filter 10 which has a frequency characteristic having a slope of -alpha around the video carrier and being flat around the voice carrier wave, is provided between a video intermediate frequency amplifier 4 and an voice detector 6. |
