Bosch Plena - Line Supervision: Impedance and Short-Circuit

Bosch Security Systems | 2006-06 | 9922 141 10377 en
Plena Voice Alarm System | Installation and User Instructions | Configuration en | 80
19 Voice alarm controller
19.1 VOX configuration
19.1.1 Introduction
The type of source that is connected to the mic/line
input with VOX functionality is set using the Mic/Line
switch on the rear of the voice alarm controller (see
figure 19.1).
• If the source is a microphone, put the switch in the
Mic position.
• If the source is a line-level source, put the switch in
the Line position.
The mic/line input with VOX functionality is
configured using DIP switches on the rear of the voice
alarm controller (see figure 19.2). By default, all switches
are in the OFF position.
The settings that can be made using the DIP switches
are explained in a table on the rear of the voice alarm
controller (see figure 19.3).
The volume of the mic/line input with VOX
functionality is set with the VOX volume control (see
figure 19.4).
19.1.2 Vox
If the Vox switch is in the OFF position, the input is
activated when the voltage of the signal of the source is
above the specified threshold. If the Vox switch is in the
ON position, the input is activated when the VOX
Switch trigger input is closed (see also section 5.3.9).
19.1.3 Speech filter
If the Speech filter switch is in the OFF position, a
speech filter is activated for the mic/line input with
VOX functionality. The speech filter improves the
speech intelligibility by cutting off the lower frequencies.
19.1.4 Phantom power
If the Phantom power switch is in the ON position, a
phantom power supply is activated. This switch only has
to be put in the ON position if the source is a
microphone that must receive phantom power. If the
source is not a microphone or if the microphone does
not accept phantom power, leave the switch in the OFF
position.
figure 19.1: VOX input source switch
figure 19.2: VOX settings
figure 19.3: VOX settings table
Phantom power
Vox
Speech filter
Off
On
Mic/Line
Phantom power
Vox
Speech filter
Off
On
Mic/Line
1 VOX activate by mic .
2 Speech filter
3 Phantom power Off
VOX activate by VOX Switch
Flat
Phantom power On
Off On
figure 19.4: VOX volume control
Phantom power
Vox
Speech filter
Off
On
Mic/Line