Sampling Theorem & Aliasing Visualizer

True Signal Freq (f_sig): 5 Hz

Sampling Freq (f_s): 25 Hz

Time Domain

Frequency Domain (Spectrum)

Original Signal

Sample Replicas

Perceived (Baseband)

Nyquist Zone [-fs/2, fs/2]

Key Concepts

Nyquist Rate Sample at least 2× the highest frequency component to avoid aliasing.

Aliasing Effect Frequencies above fs/2 fold back and appear as lower-frequency imposters.

Anti-Aliasing A low-pass filter before the ADC removes frequencies above the Nyquist limit.