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10 RECORDED MESSAGE MODULE
(RMM) LBB 1285
A unique feature of SM30 is its Recorded
Message Module, which allows up to 4
individual messages to be recorded, and
played back as desired.
The recording is digitally stored in memory
chips, ensuring that the quality will not
deteriorate for as long as the message is in
memory. Messages will remain in memory so
long as the power is turned on. If SM30 is
switched off, a backup battery will enable
the messages to remain intact for up to 30
days. The maximum total recording time is
65 seconds, and up to 4 messages of varying
durations may be recorded, so long as the
sum of the durations does not exceed the
maximum recording time. SM30 can be
programmed so that a message is played
back either alone, or preceding a call
(following an attention signal, if desired).
Playback can be activated by a Control
Input; a microphone remote switch; or a
Call Station Keypad or Function Key.
Automatic Gain Control
A limiter ensures that, even though the
microphone signal fluctuates severely, the
message is recorded at a fairly constant level.
This, however, is not an overload protection
device. The operator should speak at about
30 cm from the microphone, with a normal
speaking voice, to ensure that the input is
not overloaded.
Headphone Monitoring
A headphone socket (fig.10A) allows the
recorded messages to be monitored, both
during and after recording, without them
having to be amplified via the system. This
is especially useful, during a recording
session, for checking that a recording is
being, or has been, successfully made.
10.1 Installation
Mounting in the Control Centre
The SM30 Control Centre provides space
for one Recorded Message Module, which
must be located in slot A (see fig.5.1).
Microphone Input
The microphone input (fig.10I), terminated
with a 5-pole 180° DIN socket, provides
phantom powering, so that either a Philips
electret microphone or a dynamic
microphone may be used to record the
messages. (See fig.8 for Microphone Input
plug wiring details).
10.2 Adjustments
Output Volume Control
A volume control potentiometer (fig.10B)
on the front panel allows the output volume
level to be “lined up” with other SM30
signal sources (attention signals,
microphones, music sources, etc.). Turning
the control clockwise increases the volume
level; anti-clockwise decreases the level.
10.3 Recording messages
Clearing the Memory
On delivery of the unit the memory of the
module must be cleared, before any messages
can be recorded, as following:
■ Slide the Message Selection switch
(fig.10C) to position ‘1’.
■ Move the Function switch (fig.10H) to
the top position ‘record’.
■ Now press the (erase) button (fig.10G).
Both the green Message Present LED
(fig.10E) and the red Record LED
(fig.10F) will illuminate for as long as the
button is pushed.
When recording for the first time, or when
the memory of the module has been cleared,
it is important to record messages in
GB/SM 30 user manual 5/26/98 10:18 AM Page 26