Abstract
The traditional broadcast systems require specialized staff to operate broadcast regularly, poor automation, time and effort consuming. Design and implementation of the automatic bugle broadcast system based on the microcontroller AT89C51 and audio power amplifier LM386 is discussed. This approach truly realized the automatic broadcast of bugle. It is easy to expand because of its simple operation, programmable. Interruption signals arise from the internal timer in the SCM, thus achieve accurate timing by software. AT89C51 through the internal counter functions, change the count to generate different frequencies of different scales. Different frequency response of different scales for the frequency change of tone, after LM386 Audio Power Amplifier enlarge Finally, loudspeakers broadcast. Thus achieving the sound of automatic playback functions.
