Editing Pulse (signal processing) (section)

===Dirac pulse===
A Dirac pulse has the shape of the [[Dirac delta function]].  It has the properties of infinite amplitude and its integral is the [[Heaviside step function]].  Equivalently, it has zero width and an area under the curve of unity.  This is another pulse that cannot be created exactly in real systems, but practical approximations can be achieved.  It is used in testing, or theoretically predicting, the [[impulse response]] of devices and systems, particularly [[filter (signal processing)|filters]].  Such responses yield a great deal of information about the system.