SAMPLE / PREDICT / COMPAREWhen samples tell a different story
Sample a 7 Hz sine at 10 Hz. Predict the apparent frequency, then increase the sampling rate.
02 / CHECK YOUR PREDICTION
Did the result match your prediction?
Choose a measurable prediction before changing a setting. Record the current result, change one condition, then check. This compares complete recordings, not the replay cursor.
Prediction and baseline stay in memory for this page only. Use Start a new prediction to choose a new baseline.Observe and compare
x(t)=sin(2πft+φ), tₖ=k/fₛ · f_alias = f − round(f/fₛ)fₛ (principal band)
fₛ/2=5 Hz · Signed alias=-3 Hz · Source above Nyquist: ambiguous samples
t=0 s · x(t)=0.5
Cyan solid: source. Amber dashed: alias candidate. White circles: samples. All comparisons use physical seconds.
Pinned dashed traces compare the primary signal (continuous x or total y); the list preserves the settings. Up to three comparisons stay in page memory.