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8
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User’s Manual included in the resources CD.
The following figure is based on the 4-channel series product.
2.4 Connecting Audio Input & Output, Bidirectional
Audio
2.4.1 Audio Input
These
HDCVI DVRs
audio input port adopt BNC port. Due to high impedance
of audio input, please use active sound pick -up. Audio transmission is similar
to video transmission. Try to avoid interference, dry joint, loose contact. And it
shall be away from high tension current.
2.4.2 Audio Output
The audio output signal parameter is usually over 200mv 1K
Ω
(BNC or RCA). 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:
Use better sound pick-up with better directing property
Reduce the volume of the sound box.
Using more sound-absorbing materials in decoration can reduce voice
echo and improve acoustics Environment.
Adjust the layout to reduce happening of the squeaking.