Digital Video Recorder
Digital video recorders, or DVR to record video's that are in digital format to support. A disk drive is a sample of this medium. These digital video recorders come in the form of stand-alone set-top boxes that are connected to a monitor or TV for viewing. In connecting a digital video recorder to your video surveillance system, you can easily save images from your security camera.
DVR vs VCR
Unlike the VCR and other older methods, video recorder digital will impress you with its wide range of features and benefits. On the one hand, you can store more video films when you use a VCR Since digital video is compressed on a hard drive.
Another advantage of using a digital video recorder is to have more options viewing and recording. The recording only when there is motion is the most popular, but programmed and registration alarm are also available. Being able to score the films that you store it may be easier for you to find them later. There no more need for you to go through piles of video tapes just to find the images you are looking for. With an IP-based digital video recorder, you also have the option of sending streaming video over the Internet you can watch them wherever you go. This system is usually used by BPO companies monitor their employees around the world.
With DVR, you can also store images taken by multiple cameras simultaneously. You can also view more than one camera on your monitor in direct mode or read. You just need choosing a digital video recorder that the number of channels you need. This service is not available in the recording apparatus as conventional VCRs.
Another advantage of a digital video recorder instead of the old recording equipment is you can order to alert you when it detects certain security threats. Since some digital video recorders were equipped with sensors that can detect motion and changes in the environment, you can program it to send you a notification through your e-mail to warn you of the event. With the help of a digital video recorder, business owners can monitor their employees even if they are away. Even parents who left on business trips can make sure their children are safe. And they need not worry about allowing their children to a babysitter because they can monitor every movement.
Formats Video Compression
Video compression DVR is necessary because raw video takes up gigabytes of space on a hard drive. Also, in order to use of limited space drive the video is compressed when recorded and decompressed when viewed. You 've probably seen a number of compression formats indicating different DVR, such as MJPEG, MPEG-2, MPEG-4, Wavlet, H.263, H.264. These are different methods called compression Codec, Codec is a short name for coder-decoder. When you buy a DVR that you will find is primarily MJPEG be used in models cheaper to be the owner or persons who may not be continuously recorded. These models do a good job of compression and decompression the video adequately and playback quality is good. In many cases MJPEG is just what you need. However, if you intend to use network and view or record video remote MPEG-4 or H.264 are better choices. For frame size is less resulting in more images per second you can get when viewing on the Internet and they also take less space on your hard drive. The MPEG-4 and recorders H.264 digital video cost more but may worth the investment in the long term.
About the Author:
William M Ward is an author and technical adviser for Protection Depot, a leading online supplier of
digital video recorders
and
security cameras
. For more information about security cameras and related equipment, please visit
Protection Depot
Article Source: ArticlesBase.com – What You Need to Know About Digital Video Recorders
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