May 2014
Beginner
266 pages
11h 32m
English
Content preview from Students' Guide to Information Technology, 2nd Edition
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Students Guide to Information
Technology
Figure 6.3 Amplitude modulation
Phase modulation
(PM)
This can be used to carry digital information, and involves reversing
the phase of the carrier wave each time
a
binary
1
is encountered. The
process is also illustrated in Figure 6.5.
Multiplexing
This is the term used to describe techniques which allow
a
number of
different signals to use the same transmission link (normally air space
in the case of
radio,
wire in the case of telephone). The use of carrier
waves is one multiplexing technique. Another, suitable for use with
digital communications, splits the signals into short
packets,
inter-
140
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