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Lecture 3: Sampling, Aliasing, Antialiasing (15)
yirenng

You can think of this as a time-varying signal f(t) that is sampled 30 times a second.

JiaweiChenKodomo

To add on @yirenng 's comment, each time this signal f(t) is sampled, it is actually sampled as the avarage within a 1/800 s window: $\frac{1}{800}\int_{t_0}^{t_0 + 1/800} f(t) dt$.

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