How To Pick The Right Dvr Digital Video Recorder

in Security
Digital video recorders configured for physical security applications record video signals from closed circuit television cameras for detection and documentation purposes. Many are designed to record audio as well. DVRs have evolved into devices that are feature rich and provide services that exceed the simple recording of video images that was previously done through VCRs.

A DVR CCTV system provides a multitude of advanced functions over VCR technology including video searches by event, time, date and camera. There is also much more control over quality and frame rate allowing disk space usage to be optimized and the DVR can also be set to overwrite the oldest security footage should the disk become full. In some DVR security systems remote access to security footage using a PC can also be achieved by connecting the DVR to a LAN network or the internet. videoNEXT also makes a NVR surveillance application for the Mac OS X. Some of the latest professional digital video recorders include video analytics firmware, to enable functionality such as 'virtual tripwire' or even the detection of abandoned objects on the scene.

Security DVRs may be categorized as being either PC based or embedded. A PC based DVR's architecture is a classical personal computer with video capture cards designed to capture video images. An embedded type DVR is specifically designed as a digital video recorder with its operating system and application software contained in firmware or read only memory.

Choosing the right security DVR for your security system application can be a daunting task and I hope I can shed some light on the subject for you. These Days DVR's come in a variety of sizes not only physical but the size of the drive located in them, each will have to be picked out for your specific application.

The first thing you will want to consider before buying your DVR would be how many channels or how many cameras you need to record; typical security DVR's come in 4, 6, 8, 10 ,12, 16, 32 and 64 channel formats. Once you have determined how many cameras you would like to record you must now think about security expansion; will you want to add cameras in the future, if so you may want to consider buying the next model up that supports more channels or cameras.

Once you have figured out how many channels you need now and in the future you will need to determine the pictures per second (PPS) or frames per second (FPS) that you will need to record at. Frame rates vary widely between manufactures and models. Now lets figure out how many frames per second you would like to record. Surveillance applications usually require only 2.5 to 7.5 frames per second (FPS) compared to 30 FPS for entertainment quality video. A DVR's total frame rate should be at least equal to your required frame rate per camera times the number of cameras. If you are recording faster motion than someone walking around you may want to think about getting a DVR that has a higher frame rate. Here is an example; if you have 4 cameras and would like to record camera 1 at 10 fps, camera 2 at 30 fps, camera 3 at 7 fps and camera 4 at 40 fps you will need a DVR that is able to record at least 87 fps.

In the previous paragraph we talked about frames per second (FPS), keep in mind that the more frames or pictures that are being recorded per second will take up more space on your hard drive as you are having more pictures taken per second. Picking the hard drive space for your new DVR is not as cut and dry as picking frame rate. Your hard drive needs to support a period of time like 2 weeks to a month so that you are able to go back and reference the recordings if need be and that your recordings do not get recorded over. Hard drive space is getting cheaper and cheaper every day so going bigger than you will need will help you out later if you decide to expand. A 4 channel DVR recording at 25 to 30 FPS with a hard drive of 1TB will record roughly 30 days of video which is plenty of time to catch the video before it is recorded over.

I hope these quick tips will help you get the right attitude when purchasing your new video security DVR. Buying a DVR system can be a struggle, but these simple tips will help you buy your new system and feel good about it.
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douglas Wolfanger has 1 articles online


Nashville Security Cameras is a Nashville Video Security Supply Company where they Sell hybrid copper and fiber security systems for commercial and industrial applications.

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How To Pick The Right Dvr Digital Video Recorder

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This article was published on 2010/11/08