基于STM32单片机的音响品质测试仪  

Audio Quality Measuring Device Based on STM32

作　　者：刁楚涵 王艳[1] 陈敏杰 付山峰 林书乐 DIAO Chuhan;WANG Yan;CHEN Minjie;FU Shanfeng;LIN Shule(College of Physics and Electronic Engineering,Shanxi University,Taiyuan Shanxi 030000,China)

机构地区：[1]山西大学物理电子工程学院,山西太原030000

出　　处：《电子器件》2024年第4期935-940,共6页Chinese Journal of Electron Devices

基　　金：国家自然科学基金项目(11705108)。

摘　　要：基于STM32F407VET6单片机,设计出一款能够测试音响设备失真度、频响范围等参数的音响品质测试仪。该装置采用锂电池,配合降压电路进行供电,利用拾音电路采集声音信号,借助外置16位A/D模块进行信号的ADC采样,通过FFT算法对声音信号进行分析,得到基波电压幅值和四次谐波幅值,计算出音响设备的失真度,进而得到音响设备的频响范围,最终将结果显示在屏幕上。该装置填补了市面上音响品质测试系统的空白,具有较好的测试精度和可靠度,且结构紧凑,显示直观,使用简单,能够满足实际使用需求。To evaluate the total harmonic distortion(THD),frequency response range and other parameters of audio equipment,an audio quality measuring device is designed based on the STM32F407VET6 single-chip microcomputer.Powered by a lithium battery with a Buck circuit,the device uses the audio pickup circuit to complete the signal acquisition.With he external 16-bit A/D module for signal ADC sampling,the fundamental voltage amplitude and four harmonic amplitudes are obtained by using FFT algorithm.Accordingly the frequency response ranges of the equipment are obtained,which can be displayed on the screen ultimately.The results show that the device has high testing accuracy and reliability.Through comparing the testing data of the device with the data provided by the audio manufactures,it is found that both the THD and frequency response ranges have small errors.The device can meet the practical requirements of use.

关 键 词：STM32单片机 音响品质测试 FFT算法 失真度 频响范围 

分 类 号：TN709[电子电信—电路与系统]