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78 Handbook of Intercom Systems Engineering
Figure 5.9
TW and Matrix Signal Flows
In a wireless intercom system, the communication may be full duplex, with the two sides
of the conversation carried on two separate frequencies. This is the case with all the
Telex
®
RadioCom
™
products. In this way, the signal format is essentially the same as the
matrix intercom system shown in Figure 5.9.
In some wireless communications systems (two-way radios for example), both talk and
listen may share a single frequency, in which case the communication must be half duplex,
with the users taking turns between talking and listening. A good example of such a
system is low cost walkie-talkies, wherein the speaker you hear audio from doubles as the
microphone you speak into when you press the transmit button. In the following
discussion, we do not concern ourselves with that variety of two-way radio systems
because those systems are rarely encountered in installations with intercom systems. For
more detailed information, refer to the chapters on wireless intercom.
Interconnecting Matrix, PL, and Wireless Systems
As discussed earlier, the signal format for ADAM
™
, ADAM
™
-CS and Zeus
™
Matrices is
the same as used in the Telex
®
RadioCom
™
line of wireless intercoms. This makes
interfacing between the two systems very easy, and in fact, Telex provides connectors
specifically for this on the RadioCom
™
products. To make the two systems work
together, you simply connect two audio lines.
Speaker
User Station
TW Signal Flow
“Generic”
Bidirectional
Audio to
Other Stations
Microphone
Sidetone
+
+
BASIC SIGNAL FLOW DIFFERENCES
BETWEEN TW
&
MATRIX INTER
CO
M
S
Speaker
User Station
Matrix Signal Flow
“Generic”
Balanced
Audio
To Matrix
Microphone
Volume
Balanced Audio
From Matrix