Frequency Domain
Aliasing Explorer

Signal Parameters

Signal Bandwidth f_max 8 Hz

Sampling Frequency f_s 24 Hz

Nyquist Rate (2f_max) 16 Hz

f_s / 2 12 Hz

Pre-sampling LPF

Attenuates frequency content above f_s/2 before sampling to prevent aliasing.

✓ No Aliasing

Original Spectrum |X(f)|

Spectral Replicas

Ideal LPF Passband

Aliasing Overlap

Anti-Aliasing Filter

Nyquist-Shannon: $f_s \geq 2 f_{\max}$

Aliasing when: $f_s < 2 f_{\max}$