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How to represent spectrum repetitions in bandpass filtering?

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I am stuck in front of a non trivial task, and I hope that someone can manage to help me finding out how to do this.
I am trying to write a script to show the effects of signal sampling at several frequencies. Especially in case of a bandpass sampling, where a signal is sampled with a frequency lower than with the classical Shannon condition. What I would like to do is, finding a way to represent the spectrum repetitions of the signals at each multiple of the sampling frequency.
The normal fft function, is just limiting the calculation to the first Nyquist there a way to create those spectral repetitions for the higher Nyquist zones, in order to make some processing on them?
Thanks in advance for you help!

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