In signal processing
, the term pulse
has the following meanings:
- A rapid, transient change in the amplitude of a signal from a baseline value to a higher or lower value, followed by a rapid return to the baseline value.
- A rapid change in some characteristic of a signal, e.g., phase or frequency, from a baseline value to a higher or lower value, followed by a rapid return to the baseline value.
Pulse shapes can arise out of a process called pulse-shaping
. Optimum pulse shape depends on the application.
These can be found in pulse waves
, square waves
, boxcar functions
, and rectangular functions
. In digital signals the up and down transitions between high and low levels are called the rising edge
and the falling edge
. In digital systems the detection of these sides or action taken in response is termed edge-triggered, rising or falling depending on which side of rectangular pulse. A digital timing diagram
is an example of a well-ordered collection of rectangular pulses.
: from Federal Standard 1037C
and from MIL-STD-188