Aliasing
When a signal is sampled below twice its highest frequency, the replicated spectra overlap and high-frequency content folds down and masquerades as lower frequencies — irreversibly, which is why anti-alias low-pass filtering must happen before sampling, not after.
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When a signal is sampled below twice its highest frequency, the replicated spectra overlap and high-frequency content folds down and masquerades as lower frequencies — irreversibly, which is why anti-alias low-pass filtering must happen before sampling, not after.
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