Recorder Dvr
Digital Video Recorder (DVR) For Security
A Digital Video Recorder (DVR) offeres a superior way of processing a Video signal, as opposed to older methods which utilize analog techniques. The method of storage being the main difference where Video tape is replaced by a Digital Storage Device such as Flash memory, or a Hard Disk Drive. Digital data transfer is not as prone to the effects of noise, crosstalk, or signal coupling issues.
Once a Video Image consisting of single or multiple frames has been stored it is extremely easy to modify or add effects to. In a lot of cases a Personal Computer (PC) is involved in the storage and image modification process. The digital information (Digitized from incoming Video) usually originated from a PCI board which is plugged into the PC’s internal backplane, or simpler yet, via the USB (Universal Serial Bus) port.
(Video Digitizers) that plug into the computers USB port are often in the form of a small dongle. Some versions provide Composite Video, S-Video, and Stereo Audio inputs while others provide multiple Composite Video inputs. The later, is more suitable for Security Camera applications where Composite Video is still the accepted standard.
These devices also have the advantage of being able to rob their power supply ( 5VDC) from the USB port that they are plugged into.
There are some advantages to digitizing S-Video (the ‘S’ stands for Separate) over a Composite Video Signal. S-Video consists of Separate channels for the Luminance (Y) and Chrominance (C) Video components (both are in time synchronism). The Luminance signal conveys the brightness component of the image (like Composite Video without any Color component) while the Chrominance component is simply the Color information. As both S-Video channels are separated, there are no crosstalk issues and detrimental Bandwidth limitations due to low pass filtering. Due to these characteristics, S-Video offers improved image reproduction.
For Security and Night Vision Applications a reliable method of recording events is paramount. Use of a DVR PCI Card often provides a superior solution for time lapse image capture, and date and time stamping requirements. Also, due to advances in technology, it is often the most cost effective solution to recording Video images over long periods of time without image degradation.
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