摘要
提出一种基于ARM平台的频谱分析方案,利用快速傅里叶变换原理,实现信号的频谱分析和显示。使用DDS电路作为频谱分析中的信号发生器,信号经过幅度调整电路后,由STM32内部的A/D进行采样,对数字化后的信号做快速傅里叶变换（FFT）运算,将变换后各频率点上的幅度谱显示在LCD上。实验结果表明,该频谱分析仪完全可以满足0~20 k Hz的低频段频谱分析需求,可应用于音频信号的频谱分析处理中,由于成本低,具有一定的应用价值。
A spectrum analysis scheme based on ARM platform is proposed,in which the fast Fourier transform（FFT）principle is used to realize signal,spectrum analysis and display. The DDS（direct digital synthesis）circuit is taken as the signal generator in spectral analysis. The signal processed by amplitude adjusting circuit is sampled by A/D inside STM32,and then operated with FFT. After that the amplitude spectrum of each frequency point is displayed on LCD. The experimental results show that the spectrum analyzer can entirely satisfy the spectrum analysis demand of 0~20 k Hz low-frequency band,and can be applied to spectrum analysis and process of the audio signal. The analyzer has a certain application value due to its low cost.
出处
《现代电子技术》
北大核心
2016年第9期78-81,共4页
Modern Electronics Technique
关键词
频谱分析
直接数字频率合成
幅度调整电路
快速傅里叶变换
spectrum analysis
direct digital synthesis
amplitude adjusting circuit
fast Fourier transform
