可调频手持发射器的倍频和音量控制电路设计

Design of Octave and Volume Control Circuit for FM Handheld Transmitter

中文关键词:  手持发射器  锁相倍频  音量控制电路  OLED

英文关键词:handheld transmitter  phase-locked frequency multiplier  volume control circuit  OLED

中文摘要:

      为了保证多媒体教学正常进行，避免无线话筒在使用时出现同频干扰，提出了手持发射器的可调频设计方案。设计选用IAP15L2K61S2单片机为微控制器，利用单片机内部定时器并结合外部锁相倍频电路，产生几种不同频率的脉冲，作为音频信号的载波；利用音频芯片M62429控制音频信号幅度调节无线话筒音量，实现音频信号的可调频传输和音量调节功能。测试结果表明，该设计方案可产生多种频率稳定的脉冲信号作为音频信号载波，并具有音量控制功能，有一定的工程价值和良好的应用前景。

英文摘要:

      A FM handheld transmitter is designed to ensure the normal multimedia teaching and avoid frequency interference of a wireless microphone.With IAP15L2K61S2 microcontroller as the control core,combining MCU internal timer with the external octave circuit,the system generates several different frequencies pulse signals as the audio carrier signals.The audio chip M62429 is used to control the audio signal amplitude for adjusting the volume of the wireless microphone,FM audio signals can be transmitted and volume can be adjusted.Test results show that the design can produce a variety of stable frequency pulse signal as an audio signal carrier and has function of volume control,and it has been used in practical application.