Why a fast wheel looks slow on video, how a filter removes noise without removing the signal, and how one transform finds a hidden tone inside a mess.
3 units, about 3 hours. Free.
Demonstrate aliasing numerically and state the sampling rate a signal requires.
2Build a moving-average filter, measure its effect on noise, and explain the smoothing trade-off.
3Use a discrete Fourier transform to recover buried frequencies and explain what the spectrum shows.