As people's level of science and technology increases day by day, the development of multimedia audio has become faster and faster, and because of people's living standard is getting better and better, the quality of music sound put forward higher requirement. So the 5.1channel multimedia audio gradually goes into the ordinary people 's home，but normal family only equip with 2.0 interface，can not output 5.1 signal directly，it also restrict the development of 5.1channel multimedia audio.
This design uses HT6221 chip to design the circuit of remote control transmitting, using SM8951A to design a remote control receiving circuit and power amplifier circuit to the other control circuit, the power amplification circuit is composed of an input mode switching circuit, the channel volume control circuit and the audio amplification circuit. Mode switching circuit can transform 2.0 input signal into a 5.1 input signal or 5.1 input to 2.0. Sound volume control uses the M61538fp control chip, the way for data exchange with single chip microcomputer is serial communication.
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