Extron electronics VoiceLift User Manual page 12

FIG_Audio signal path
3
PoleVault Switcher
INPUTS OUTPUT AUDIO OUT
L R
1/2 3/4
HDMI
POWER SIG LINK SIG LINK
INPUT 5
12V
3A MAX
L R
PVT IN PVT IN
Figure 3. VoiceLift System Connections and Audio Signal Path
a
Microphone — The VLP 202 Pendant Microphone or the VLH 102 Handheld
Microphone picks up speech from the instructor and transmits a mono audio signal
via infrared (IR) on the selected channel (2.3 MHz or 2.8 MHz).
b
Receiver — The VLR 102 receiver picks up the IR signal from the microphone. The
receiver outputs a balanced -10 dBV line level signal via an RJ-45 connector. The
signal passes to the PoleVault switcher through a shielded twisted pair (STP) cable.
c
PoleVault switcher — The PoleVault switcher also functions as an amplifier for the
VoiceLift System. It receives the audio signal from the VLR 102 receiver, amplifies it,
and sends it to strategically placed speakers. The switcher powers speakers placed
throughout the room to improve the signal-to-noise ratio of the voice of the speaker
to at least +15 dB.
VoiceLift System with PVS 405D • Features and Operation
1
VLP 202
Pendant
Microphone
or
VLH 102
Handheld
Microphone
+
VLR 102
2
Receiver
To Speakers
PVS 405D
PAGING
SENSOR
VOICELIFT
+V
AUX OVER PVT
OUT IN
MLC
Controller
Connection
AMPLIFIED AUDIO OUT
LAN 1 LAN 2
L R
DO NOT
GROUND
OR SHORT
4/8
SPEAKER
OUTPUTS
REMOTE
IR RS-232
S G Tx Rx G
LAN 3
6