This paper designs a switcher for audio system,with 8 input channels(1～8)and 2 output channels,which can be switched manually and automatically.In manual mode,the output signal of different channels can be selected by pressing the button to monitor the broadcast signal of the corresponding channel;In the automatic mode,the output signal is cycled,the received broadcast signal is cycled,and the cycle time is set by the button combined with the OLED.In this paper,a medium wave broadcast audio loop switcher is developed based on the control principle of single chip microcomputer,which realizes the monitoring work of medium wave broadcast signal,including monitoring the audio broadcast signal source of medium wave transmitting station and receiving the demodulated broadcast signal.This design proposes an improved method to detect whether there is audio input by A/D level on the traditional audio switcher design,so as to achieve the purpose of intelligent audio cycle.The design mainly includes MCU circuit,audio circuit,A/D level detection circuit,key and indicator circuit,display circuit,serial communication circuit.
关键词
单片机控制/智能音频循环切换器/音频选通/A/D
Key words
single chip control/intelligent audio loop switcher/audio selector circuit/A/D
维普
万方数据