The invention discloses a acoustic power
amplifier circuit for multiple audio source sharing, including output circuit of audio source, input circuit of differential
audio power amplifier, feedback circuit of differential
audio power amplifier, differential
audio power amplifier,
baseband processor and loudhailer. Series resistance for multiple audio source output,
analogue switch is also included, wherein one end of series resistance for multiple audio source output is connected to corresponding output circuit of multiple audio source, which is used for receiving output
audio signal from output circuit of multiple audio source and compensating output resistance; the other end of series resistance for multiple audio source output is connected to
analogue switch, and the other end of
analogue switch is connected to input circuit of differential
audio power amplifier, wherein the analogue switch is used for switching series resistance for multiple audio source output to output
audio signal of multiple audio source to differential
audio power amplifier output circuit. The
baseband processor is connected to analogue switch, which is used for analogue switch to control switching channel of
audio signal of multiple audio source, and complete modulation and
demodulation of
baseband signal. The invention realize consistence of output volume from multiple audio source and adjustment range of the terminal device with low cost.