摘要
基于ARM Cortex-M3内核的32位处理器STM32F103和快速傅里叶变换(FFT)算法实现了音频信号频谱的分析。整个系统由前级信号调理、A/D采样电路、CPU运算电路和LCD显示电路等组成。实验表明,系统能够检测20 Hz^10 kHz范围内的频率成份并显示音频信号频谱,该方案成本低,具有一定的应用价值。
The spectrum analysis of audio signal is implemented by ARM Cortex-M3-based 32 bit processor STM32F103 and FFT algorithm. The system includes signal-processing stage, A/D sampling circuit, CPU computing circuit and LCD display circuit. Experiment result shows that the system can detect frequency component from 20 Hz to 10 kHz and display audio signal spectrum. This scheme has a lower cost and application value.
出处
《现代电子技术》
2014年第1期19-21,共3页
Modern Electronics Technique
