Nyquist frequency, fidelity, & perception

[Zeb T]

So if I understand correctly, we can’t sample a waveform with a frequency above the Nyquist frequency or we’ll get aliasing. At that point there’s a loss of fidelity, which is undesirable. Does loss of fidelity correspond to a loss of information at the level of perception? Do different aliases result in different degrees of information loss?

[Simon]

Aliasing is not so much a “loss of fidelity” as a distortion. We will introduce frequencies into the sampled signal that are false: they are related to the contents of the original signal above the Nyquist frequency (mirrored about the Nyquist frequency in fact).

[Author]

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