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Pulse Modulation (PM)
is a method of modulation that represents information as a train of
pulses, wherein one or more characteristics of each pulse change with
the input signal's variation. There are many types of pulse
modulation, as shown by Table 1.
Table 1. Types of Pulse Modulation
|
Modulation |
Abbreviation |
Description |
|
Pulse
Amplitude |
PAM |
the
amplitude of the pulse is proportional to amplitude of the input
signal |
|
Pulse
Time |
PTM |
the
timing parameters of the pulse
is proportional to amplitude of the input signal |
|
Pulse
Width |
PWM |
also
known as Pulse Duration Modulation (PDM) and Pulse Length
Modulation (PLM);
the
width of the pulse is proportional to the input signal |
|
Pulse
Position |
PPM |
the position of the pulse is proportional to amplitude of the input
signal |
|
Pulse
Code |
PCM |
the input signal is converted into pulses by a coding method |
|
Delta |
----- |
also known as 'slope' modulation;
the pulses correspond to the derivative of the amplitude of the
input signal |
See also:
Reference Tables;
Articles
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