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Aliasing
Aliasing makes different analogue frequencies indistinguishable after sampling. Unwanted signals may then appear inside the digital range of interest.
Also found under: Aliasing · Spiegelfrequenzen
A concrete example
A 30 kHz tone appears as 18 kHz when sampled at 48 kS/s with real samples unless sufficiently filtered first.
What to keep in mind
A subsequent digital filter cannot uniquely separate signals that have already folded onto each other.
Further reference
Original explanation based on the technical documentation. Reviewed on 15 October 2026.
Analog Devices · MT-002: Nyquist criterion ↗