基于单片机的音频信号分析仪的设计  

Design of Audio Frequency Analyzer Based on Single Chip Computer

作　　者：王平[1] 江华丽[1] 王毅[1] 郑孔华[1] 

机构地区：[1]福建师范大学物理与光电信息科技学院,福建福州350007

出　　处：《现代电子技术》2009年第19期122-124,共3页Modern Electronics Technique

基　　金：福建省科技厅"基于嵌入式的网络便携式终端的研究"(2007F5039)

摘　　要：着重介绍音频信号分析仪的软硬件结构、特征及其工作原理,设计采用DSPIC30F6014A单片机为主控制器,基于A/D转换和快速傅里叶变换方法对采集的音频信号进行频谱分析,能检测20 Hz^10 kHz,100 mV^5 V的音频输入信号,频率分辨率达到20 Hz,检测出的各频率分量的功率之和不小于总功率值的95%,单个频率功率误差小于10%,因此在嵌入式系统方面具有较好的应用价值。The audio frequency analyzer r s software and hardware structure, the characteristics and the principle of work are introduced. This design uses DSPIC30F6014A monolithic integrated circuit as the controller,it bases on the A/D transformation and FFT transformation to analyze the audio frequency signal, which can exaruine 20 Hz- 10 kHz and 100 mV- 5 V audio frequency input signal, frequency distinguish can reach to 20Hz,the various frequency eomponent＇s sum of power is not smaller than the total performance 95%, the single frequency power error is smaller than 10% ,therefore it has good aspect in the embedded system＇s application.

关 键 词：音频信号 DSP FFT DSPIC30F6014A 

分 类 号：TH89[机械工程—仪器科学与技术]