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The center of a bandpass frequency of 15MHz, the bandwidth is 750Hz (carrier on each side of the 375Hz). (1) the use of bandpass sampling theorem, identifying non-sampling error to restore the minimum bandpass sampling frequency (2) If (1) the sampling frequency, sampling frequency spectrum Draw (3) from (1) the sampling frequency start, consider increasing the frequency of sampling, how to increase the number of sampling frequency can be no aliasing error?