| 摘要 |
The circuit includes a sound player, a microphone amplifier, a DSP(Digital Signal Processing) chip attenuating the output from the sound player and the amplifier under attenuation control data to mix the 1st and 2nd channel sound(L)(R) with the microphone signal, variable resistors for surround and echo effects linked between a power and an earth, a level shift detected data transmitter detecting a level shift of control voltages from the variable resistors to provide corresponding attenuation data for the DSP.
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