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Spectrum analysis can quickly extract signal features, and is widely used in digital signal processing (DSP). Fast Fourier Transform (FFT) is chosen in the application for audio signal frequency spectrum analysis. The paper is based on FFT, aiming at audio signal acquisition, do optimization of the reverse position and butterfly algorithm, and then utilize the optimized algorithm to do frequency spectrum...
According to the IEC and national standards, the powerful data-processing capability of DSP and the high precision A/D data acquisition chip are used for data synchronous acquisition and analysis, monitoring values are computed in the DSP which communicates with ARM via serial port and FIFO. Making full use of some characteristics of ARM module, such as its high performance and ample periphery interfaces...
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