signal edge

{{Short description|Concept in electronics}}

{{More citations needed|date=December 2015}}

Image:Digital Signal Square Wave.svg indicated in blue]]

In electronics, a signal edge is a transition of a digital signal from low to high or from high to low:

• A rising edge (or positive edge) is the low-to-high transition.{{citation|first=Arnold S.|last=Berger|title=Hardware and Computer Organization|date=20 May 2005|page=32|publisher=Newnes |isbn=978-0-7506-7886-5}}
• A falling edge (or negative edge) is the high-to-low transition.

In the case of a pulse, which consists of two edges:

• The leading edge (or front edge) is the first edge of the pulse.
• The trailing edge (or back edge) is the second edge of the pulse.