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Mixer and audio processor units
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DLC9000
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Automatic controller of audio level
DAG9300 • Alarm-tone generator and voice recorder
The DLC9000 is a device for automatic control of the audio level for
broadcasting messages in places featuring variable background noise
levels such as, by way of example, a railway station or a chain sto-
re where the level of the background noise is higher when the area
is crowded than when there is no movement. The DLC9000 uses a
microphone, not included in the supply (for example, an M936 dyna-
mic microphone or an MC102 flat electret microphone) to detect the
ambient noise. The output of the control is connected between the
pre-amplifier and the power amplifier of the zone considered.
The noise measuring device is extremely simple to configure. The va-
rious different stages of programming can be selected easily using
only three push-buttons (Up/Down and Select) in the menu shown on
the 16-digit backlit display.
The DAG9300 is an alarm-signal generator that can be used to record
and play out two voice messages. 12 different alarms (to be chosen
from among the 20 different synthesised tones available). The tones
and pre-recorded messages can be activated either by means of the
front-panel controls or by means of contacts on the rear panel. One
very interesting feature is that a microphone station of the
B711
ran-
ge can be used to record a voice message and play it out with a certain
functional features
• Level of background noise shown in real time
• Storage of background noise level (minimum and maximum)
• Level of attenuation definable on the basis of the required S/N ratio
• Incremental adjustment of the ratio
• “Precedence” contact or “VOX” function for emergency calls
• Monitoring loudspeaker
delay after completion of the recording (“DELAY PLAY” mode). In this
way it will be possible to make voice announcements to be broadcast
with a certain delay, so as to avoid triggering the Larsen effect, created
when the microphone is too close to the loudspeakers. With the “REC
PLAY” mode, on the other hand, it will be possible to use the base for
sending out a pre-recorded message.