2. The signal using the FFT spectrum analysis     For continuous signal xa (t) = cos (2πf1t)+ 5cos (2πf2t)+ cos (2πf3t), where f1 = 6.5kHz, f2 = 7kHz, f3 = 9kHz, sampling frequency fs = 32 kHz is sampled, (1) xa (t) signal acquisition 16:00 samples, respectively, for 16:00 and zeros to the 256-point FFT, and were drawn corresponding amplitude-frequency characteristic curve. (2) xa (t) signal samples collected 256 points, respectively, for 256 points and FFT 512 points, and were drawn corresponding amplitude-frequency characteristic curve. (3) Comparison of (1) and (2) the results, analyze the impact of sampling points and the Fourier transform of FFT points, indicating that the spectral characteristics and differences between high density and high resolution spectrum.

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