Microphone sensitivity
The setting for the microphone sensitivity sets the gain of the microphone amplifier in front of
the signal limiter. The output level preset (item (8) in Call Station hardware configuration, page
24) sets the volume of the output after the signal limiter. Note that these are two different
things. The output level sets the maximum loudness of the announcements in the zones, while
the sensitivity setting compensates for loud or soft speaking voices. Soft speakers or speakers
that keep much distance from the microphone should use a high sensitivity. Be careful with
selecting a high sensitivity in combination with a high output level, when the zone
loudspeakers are in the same area as the call station. This might result in acoustic feedback
(howling).
1. Press the PTT button and Zone 5 button simultaneously for more than 3 seconds, the
Talk LED and Zone 5 LED will flash to indicate this configuration mode.
2. Press button Zone 5 repeatedly to step through the six different sensitivity settings
sequentially. The Zone 1-3 LEDs show the selected sensitivity (0 = LED off, 1 = LED on).
3. Press the PTT button to store the selected sensitivity and exit.
Sensitivity
Zone 3 LED Zone 2 LED Zone 1 LED
1 0 0 1
2 0 1 0
3 0 1 1
4 1 0 0
5 1 0 1
6 (max) 1 1 0
Table 7.4: Microphone sensitivity settings
Speech filter
The speech filter removes the lowest frequencies of the speech signal, that are especially
present when talking close into the microphone. Removing the lowest frequencies reduces the
risk for amplifier overloading and in general improves intelligibility.
1. Press the PTT button and Zone 2 button simultaneously for more than 3 seconds, the
Talk LED and Zone 2 LED will flash to indicate this configuration mode.
2. Press button Zone 2 to toggle between a flat frequency response and the filtered
response. The Zone 2 LED shows the selected filter setting (0 = LED off, 1 = LED on).
3. Press the PTT button to store the speech filter setting and exit.
Speech filter Zone 2 LED Remark
Filtered response 0 Low cut @ 315 Hz (-3 dB), 6 dB/
octave
Flat response 1
Table 7.5: Speech filter settings
Priority mode
This setting determines what happens when more than one Call Station is connected to the
All‑in‑One Unit. For consistent behavior make sure that all connected Call Stations use the
same setting.
7.3.2
7.3.3
7.3.4
26 en | Configuration Plena All-in-One System
2014.09 | V1.2 | Installation and Operating Manual Bosch Security Systems B.V.
To Next Page
Loading...
