You can think of this as a time-varying signal f(t) that is blurred in time (according to ideas later in lecture, convolved with a box-filter with a width of 1/30 in time), before being sampled 30 times a second.
You can think of this as a time-varying signal f(t) that is blurred in time (according to ideas later in lecture, convolved with a box-filter with a width of 1/30 in time), before being sampled 30 times a second.