Learn in the textbookUnits of Information and the Digitization Process
DefinitionSampling (標本化) is the step of taking, once every fixed time interval, the value that a signal changing over time has at that moment.
ExplanationThe time between readings is called the sampling period, and the number of readings taken per second is called the sampling frequency. A shorter period means correspondingly more values to record.
AnalogyIt is like taking burst photos of a runner at regular intervals: the shorter the gap between shots, the more of the motion in between you keep.
Memory hookThe kanji 標本 means a specimen taken from a larger whole, which links to picking sample points out of a continuous wave.