1. Sampling a Waveform
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A sine wave signal can be generated with sin().
Two sine waves of different frequency
By taking measurements of a signal at regular intervals, a discrete signal results. Each measurement is called a sample:
Sine wave sampled at regular intervals
The first 10 samples are 0.00, 0.93, 0.68, -0.43, -1.00, -0.29, 0.78, 0.87, -0.15, and -0.97.