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Muliplexing enables
several signals to be
sent over the same
channel simultaneously.
In the top diagram, the
Multiplexer rotary
switch samples each
channel in turn, and
connects it to the link.
The Demultiplexer switch
connects each listener
in turn, to the link.
As long as the two
switches are rotated in
synchronism, Listener 1
will only hear Talker 1,
etc.
The minimum sample rate
need only be twice the
highest frequency of a
talker signal, according
to Nyquist.
In practice, electronic
switches are used.
A synchronising signal
is required to keep
talkers and listeners in
step.
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