CCTV Digital Video Recording Systems
What is a DVR?
A Digital Video Recorder (DVR) stores video footage on Hard Disc Drives instead of on traditional video tape.
Benefits of DVR over tape:
1. Mass storage
Dependant on the system configuration, a DVR could store many weeks of surveillance footage.
2. Instant playback
Since the DVR does not use video tape, you can go straight to a selected recording instantly. The comparison is the same as that between your domestic VCR and DVDs - no fast forward, no rewind.
By their very nature, video tape recorders will wear out. Video tapes are in constant use; tape oxides clog the heads or heads wear out. By contrast, the DVRs only moving parts are inside the hard discs. The average modern hard disc has a service life of 5 years and a MTBF (Mean Time Between Failures) of around 500,000 hours - that's a long time in anyone's language.
4. Two Products In One
A DVR is actually two devices built into the one product. As well as the digital recorder, the Ness range of DVR's have built-in Triplex multiplexers, providing recording, playback and live viewing simultaneously.
5. Video Integrity
The range of Ness DVR's store video footage encrypted and watermarked which cannot be tampered with or disputed as evidence.
How does digital recording save you money?
Simple, by avoiding the need to constantly repair and or replace VCR's as they become tired and clogged up with the oxides from video tapes, by minimising the amount of time staff needs to archive and change tapes and by allowing you to efficiently replay "events" at call instead of having to sit and watch hours of video to find an event.
TAPE vs. DIGITAL
The Digital Video Revolution
This is a VERY difficult if not impossible question to answer generically. Don't let anyone say they can unless they are very specific about all the factors that must be considered. Frame Rate per camera, resolution, constant record rates, motion record rates, percentage of activation over a 24 hour period and numerous other factors all contribute to how much video can be stored for a given Hard Disc capacity.
This is arguably the most important part of the system's set up, for the more efficient you make your system in relation to YOUR requirements then the less hard drive capacity you need and hence the cheaper the system. I can't tell you strongly enough that you should be prepared to spend at least a couple of hours with your professional CCTV installation company to design your system to reach the outcomes that you expect.
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