Filtering functions {comb function} {shah function} {sampling function} can have unit amplitude, zero width, and unit area at regular intervals: _|_|_|_|_. Comb filter selects points or intervals.
Filtering functions {Dirac delta function} {pulse filter} can have infinite amplitude, zero width, and unit area: __|__. The pulse filter selects point or interval.
Functions {filter function} can sample another function at intervals, to measure spatial wave-front spectrum or reveal pattern shape and size.
Filtering functions {rectangle function} {pi function} can equal one over interval and equal zero elsewhere: __-__. Filter selects point or interval.
Filtering functions {triangle function} can equal zero except over interval where it rises then falls linearly at 45-degree angle: __A__. Filter selects interval and weights middle most and ends least.
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Date Modified: 2022.0225