23
These series products audio input port adopt BNC port, matrix and loop use BNC port. Device
supports bidirectional talk via BNC.
Due to high impedance of audio input, please use active sound pick-up. See
X285H285H285H
Figure 3-3.
Audio transmission is similar to video transmission. Try to avoid interference, dry joint, loose contact
and it shall be away from high tension current.
Figure 3-3
3.7.2 Audio
Output
The audio output signal parameter is usually over 200mv 1K
Ω
(BNC). It can directly connect to low
impedance earphone, active sound box or amplifier-drive audio output device.
If the sound box and the pick-up cannot be separated spatially, it is easy to arouse squeaking. In this
case you can adopt the following measures:
z
Use better sound pick-up with better directing property.
z
Reduce the volume of the sound box.
z
Using more sound-absorbing materials in decoration can reduce voice echo and improve
acoustics environment.
z
Adjust the layout to reduce happening of the squeaking.
Please refer to
X286H286H286H293H
Figure 3-4
X
.
