说明：  由32位MCU为主控制器，通过AD转换，对音频信号进行采样，把连续信号离散化，然后通过FFT快速傅氏变换运算，在时域和频域对音频信号各个频率分量以及功率等指标进行分析和处理，然后通过高分辨率的LCD对信号的频谱进行显示。该系统能够精确测量的音频信号频率范围为20Hz-10KHz，其幅度范围为5mVpp-5Vpp，分辨力分为20Hz和100Hz两档。测量功率精确度高达1 ,并且能够准确的测量周期信号的周期，
(Main controller by a 32-bit MCU, via the AD converter, for sampling the audio signal, the continuous signal is discretized, and then by FFT fast Fourier transform operation, in the time domain and frequency domain, the respective frequency components of the audio signal and a power indicator analysis and processing, and then displayed on the spectrum of the signal through a high resolution LCD. The system is able to accurately measure the audio signal frequency range of 20Hz-10KHz, The amplitude range 5mVpp-5Vpp, resolution is divided into two tranches of 20Hz and 100Hz. Measuring power accuracy of up to 1 , and capable of accurate measurement of the cycle of the periodic signal,)