How to represent spectrum repetitions in bandpass filtering?

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Giovanni 2013-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/66168-how-to-represent-spectrum-repetitions-in-bandpass-filtering

评论： Emilija Lazdanaite 2020-9-29

Hello,

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 zone....is 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!