Signal edge

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Signal edges shown in rectangular pulse amplitude modulation with polar non-return-to-zero, inverted coding waveform

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.[1]
  • A falling edge (or negative edge) is the high-to-low transition.[1]

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.

See also[edit]


  1. ^ a b Berger, Arnold S. (20 May 2005), Hardware and Computer Organization, p. 32, ISBN 978-0-7506-7886-5