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Administrator’s Guide and Operating Instructions
2
1.2 Technical Overview
1.2.1 Video Input and Output
The digital video recorder is designed to support either NTSC/EIA or
PAL/CCIR standard. To make the auto detection of video standard
work, at least one camera must be connected to the video input.
Camera input impedance termination is set independently for each
camera automatically.
Synchronizing or phasing cameras is not
required to achieve the frame rate of 30 fps for NTSC/EIA or 25
fps for PAL/CCIR.
1.2.2 Video Processing
The video processor controls the switching of the built-in video
matrix according to the system configurations. The video encoder
keeps analyzing the video signal from the cameras, and encoding the
incoming pictures in JPEG format or MPEG-1 format that is digitized
and smaller in size at 30 fps for NTSC/EIA or 25 fps for PAL/CCIR.
During video playback, the video decoder decodes the digitized
format, no matter it is JPEG or MPEG-1, and then displays the
decoded pictures on the VGA monitor screen.
1.2.3 Video Storage and Retrieval
The encoded pictures are stored in the hard disks, with the stored
frame rate for each camera set by the administrator. If any event
(Alarm, Motion, or Video Loss) happens, all the encoded pictures for
the correspondent camera for the preset pre-record duration will be
saved to the hard disk, and the recording rate for that camera will be
changed to its alarm recording rate afterwards for the preset
post-record duration.
During video playback, the selected pictures can be saved to ZIP disk,
DVD RAM etc. in .MPG format for MPEG-1 encoded video
or .MOV format for JPEG encoded video.
For Time-Lapse Mode Recording Time, please refer to Appendix B.
1.2.4 Motion Detection
The digital video recorder continuously monitors all camera inputs
for motion. When motion is detected, the system reacts according to
the motion action set by the administrator, including increase of
recording frame rate, sounding the buzzer, triggering the alarm output,