Design of Emergency Audio Switcher for Medium Wave Broadcasting Based on Single-chip Microcomputer
As an important signal source link device,an audio switcher is widely used in broadcasting systems.This paper designs a signal source emergency audio switcher based on single-chip microcomputer technology,including single-chip microcomputer circuit,audio selection circuit,signal source detection and judgment circuit,indicator circuit,key circuit,power off guaranteed circuit,etc.In manual mode,users can select the desired signal source output through buttons;In automatic mode,the device automatically selects the signal source output based on the preset priority.In addition,the device will automatically alarm when all signal sources are interrupted.When the whole equipment is powered off,as a signal source emergency device,it can ensure the output of the main signal source,to avoid the suspension of broadcasting,and better ensure the safe and high-quality broadcasting of radio and television signals.
万方数据
维普
