音频信号分析仪的设计

本文介绍了音频信号频谱分析的原理以及音频分析仪的硬件结构和软件设计。该设计是基于快速傅立叶变换(FFT)的方法对采集的音频信号进行频谱分析,得到音频信号的频率及功率。FFT算法采用凌阳SPCE061A单片机C语言实现,可以完成256点的FFT运算,频率分辨率达到100 Hz,输入信号电压(峰峰值)可以达到100 mV~4 V,检测出的各频率分量的功率之和不小于总功率值的96%,单个频率功率误差小于8%,可测量被测正弦信号的失真度和周期性。

Design of audio frequency signal analyzer

This article introduced the principle of frequency signal analyzer,and also introduced the audio frequency signal analyzer's hardware structure and design of software.The design analyzed collected audio signal frequency based on FFT.It can get audio signal's frequency and power.The arithmetic of FFT is realized by C program.It can accomplish 256 point FFT operation.The frequency distinguish reached to 100 Hz,The input of voltage could reach to 100 mV~4 V,The frequency ponderance power was checked is more than total power's 96%,Single frequency power error is less than 8%,It can measure sine signal's distortion and period.