DVR systems DVRxx04HF-U Series User Manual
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HD-SDI Series
960H Series
Figure 3-2
3.7 Connecting Audio Input & Output, Bidirectional Audio
3.7.1 Audio Input
BNC port is adopted for audio input 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.