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,

音频频谱分析.doc

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