IC Realtime Combo Series: 8 Channel DVR with built-in 10 LCD monitor - Manual (Page 26)

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Figure 3-4
3.8 Connecting Audio Input & Output, Bidirectional Audio
3.8.1 Audio Input
These series products adopt BNC port.
Due to high impedance of audio input, please use active sound pick-up. See
X285H285H285H
Figure 3-.5.
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 3-5
3.8.2 Audio Output
The audio output signal parameter is usually over 200mv 1KΩ (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
X286H286H286H
Figure 3-6.