| 摘要 |
<p>PURPOSE:To omit recording of narration and record only music, by controlling the temporary stop means by the detection of narration for recording of the musical program of FM broadcasting. CONSTITUTION:When sound recording circuit part 8 is recording the music of stereo broadcasting of FM receiver 1, an output is generated from voltage comparator 21 in narration circuit part 9 due to the occurrence of the difference between output levels of noninverting amplifier 17 and inverting amplifier 18 of level detecting circuit 14, and AND gate 32 is closed, and temporarily stopping plunger 33 is not operated. When narration is started, no output is generated from voltage comparator 21, and frequency spectrum detecting circuit 15 is cut off by band cut-off filter 24, and an output is generated from no-sound detecting circuit 16, and AND gate 32 is opened, and temporarily stopping plunger 33 is driven. When the music restarts, AND gate 32 is closed to set the temporary stop mode.</p> |
