Interactive Online Nyquist Simulator

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Interactive Online Nyquist Simulator

The Nyquist Folding Simulator

Nyquist Limit (The "Mirror")

f_limit = f_s / 2

Observed Frequency

f_obs = f_sig

Signal Frequency: 4 Hz

Sampling Frequency: 20 Hz

Signal is safe (f_sig < f_limit)

Instructions for Students:
1. Keep Sampling Freq at 20 Hz. The Red Mirror is now at 10 Hz.
2. Move Signal Frequency from 1 Hz up to 9 Hz. Notice the Yellow spike follows the Blue spike exactly.
3. Push Signal Frequency past 10 Hz. Notice the Blue spike crosses the mirror, but the Yellow spike folds back.
4. The Yellow spike is an "Alias"—an imposter that the computer thinks is the real signal.

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