Playback control circuit in the video song accompaniment system

摘要

The present invention relates to a reproduction control circuit in an audio visual accompaniment system, comprising a first filter (10) for removing a noise component of a voice signal input from a microphone and a pulse signal corresponding to a microphone touch, A first amplifier 12 for amplifying and outputting a filtered voice signal and a microphone touch pulse signal from the first amplifier 12, a voice level controller 14 for adjusting the level of the amplified voice signal from the first amplifier 12, And a second amplifier (16) for amplifying and outputting the audio signal adjusted by the audio level adjusting unit (14), wherein an output terminal of the first amplifier (12) is inverted An operational amplifier 18 for connecting a terminal (-) to the inverting terminal (-) thereof and a feedback capacitor (C6) for operational amplification of a microphone touch pulse signal from the first amplifier 12, A diode D1 connected in series with the output terminal of the diode 18, A second filter unit 20 connected to the second filter unit 20 via a resistor R9 to filter the microphone touch pulse signal at a predetermined level or higher output from the operational amplifier 18 to a predetermined level, And a counting unit 22 for counting the micro-touch pulse signal.