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用Graph画出FFT的代表什么意义?



CCS3.3下,用Graph/Time&Frequency/FFT Magnitude画出的图,其中input图为输入的信号,inputFFT图为对输入信号用FFT Magnitude得出的结果,我想问下就是inputFFT图的横坐标与纵坐标的意义,如(0.0234375,62924.8)代表什么含义?