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Not true

If you modulate a sine wave in the frequency as well as amplitude domains, you never have a signal that exceeds fs/2 because at any given instant in time, what you have is pure sine wave not exceeding Nyquist.

Yet, you can construct signals consisting of such sine waves that CANNOT be correctly reconstructed due to quantization error. This is NOT a violation of the sampling theorem, because one of the conditions for the theorem to hold has not been met.


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