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DVR - Data Information
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What is DVR (Digital
Video Recording)?
DVR Understanding
DVR
is an equipment which digitally records multiple video signals- generated
by CCTV devices. Images are recorded into Hard Disk Drive. DVR
is based on personal computer architecture. Consequently, advantages of
PC based DVR follows. First, capable of performing quick and easy access
of video archive, you can search and display your incidents instantly
by hours, minutes and even by seconds. Second, networking via internet
by using network adapter or modem, DVR allows
you to access CCTV images through internet. Enabling remote monitoring
from anywhere in the world. Finally, Data Transformation, one of the biggest
advantages of PC is transferring and transforming data. Same rule applies
to DVR transfer video data by using CD-RW.
This enables replay of video data at any location via PC.
Real
Time Recording
Still using old VCR tape recording devices? Tired of switching tapes over
and over again? Now with DVR, a new way of recording digitally. Experience
up to 2 weeks of recording time with basic HDD space and motion detect
record setting.
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Advantages
of DVR vs. VCR
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VCR
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DVR
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| 1. Reduced picture
quality as time progresses |
1. Quality images
stayed same all time |
| 2. Short recording
time |
2. Increased in time
recording |
| 3. Complicated search
task |
3. Multiplexer not
required (builit in) |
| 4. Chewed up tapes
getting stuck in VCR |
4. Built in motion
detector |
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5. Ease of video archiving |
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6. Transferring of
video data using cd-rom |
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7. Remotely access
DVR anywhere |
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8. Built in Pan/Tilt
camera control |
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9. Ability to record
while search function operate |
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| System Configuration |
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| Diagram A: Consist System connection w/out Pan &
Tilt Camera |
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| Diagram B. Consist connection with Pan & Tilt Camera/Controller |
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| Back Panel Slot |
| DVR Back Panel consist of the following connection. |
| 1. Keyboard Input |
11. 1-4 Channel Video Input |
| 2. PS/2 Mouse Input |
12. 5-8 Channel Video Input |
| 3. 2 USB Ports |
13. 9-12 Channel Video Input |
| 4. 2 RS-232 Serial Ports |
14. 13-16 Channel Video Input |
| 5. Printer Port |
15. 10/100 Mbps LAN Adapter |
| 6. Audio Out/In/Mic |
16. Phone Line In |
| 7. Joystic Fort |
17. Telephone Out |
| 8. S-Video Output |
18. AC Power Input |
| 9. SVGA Output |
19. 210V/115V AC |
| 10. Compostie Video Out |
20. Main Power Button |
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21. Power Supply Fan |
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| Recording Time |
| Recording time depends on the traffic/movement the camera
receives per day. It is hard to give an exact time for recording because
different user receives different traffic. Our DVR is equipped with option
of Motion Sensor or straight recording. Because of difference traffic received,
Digital Video Recording could be up to months. |
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| Recording Type |
| Recording type comes in Real Time and Non-Real
Time. Real Time Display or Recording usually cost more than Non-Real Time.
Recording type is basically a preference by the user. Selection of DVR comes
in Real Time or Non-Real Time Display and Real Time or Non-Real Time Recording.
Places such as casinos only use Real Time both in display and recording.
Places such as an office or home, might need Real Time Display but not need
Real Time Recording. Again, it comes down to preference. Below is a basic
understanding of what is consider Real Time and what is Not. |
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| Real Time |
| DVR comes in non-real time and real time. Real
Time records in 30 frame per second per camera (fps). |
| Example 1. (Non-Real Time) |
| 4 cameras dvr system running at total 60fps. Divide 60fps/4cam
= 15fps > Not Real Time. To be consider real time the equation sum must
equal to 30fps. |
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| Example 2. (Real Time) |
| 4 cameras dvr system running at total 120fps. Divide 120pfs/4cam
= 30fps > Real Time |
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