EverFocus eDR400 operating instructions Technical Overview, Video Input and Output

Administrator’s Guide and Operating Instructions

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,

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