Use Of Dvr And Cctv Video Security Camera System

A DVR OR Digital Video Recorder can record video.the video can be recorded in a digital

format to diskdrive,usb key driveor any memory medium within a device.the term DVR includes stand-alone set-top boxes, portable media players and camcorders that record in memory card and software for personal computers which enables video capture and playback to and from disk.LG ELECTRONICS in 2007 offer televisions with DVR hardware and software built into the television itself.

The two early consumer DVR was ReplayTV and TiVo.they were were launched at the 1998 Consumer Electronics Show in Las Vegas.these are harddisk based DVR.There are also Pc based DVR which is very popular.there are many DVD-based DVRs have the capability to copy content from a source DVD. In the U.S. This type of copy is disallowed under the Digital Millennium Copyright Act if the disc is encrypted.

There are several application of it.DVR is configured for physical security applications and record video signals from CCTV cameras for detection and documentation purposes. Many are also designed to record audio .A DVR CCTV system provides a multiple functions over VCR technology including video searches by event, time, date and camera.

Digital video recorders(DVR) are also changing the way television programs advertise products.users are Watching pre-recorded programs which allow to fast-forward through commercials,. some technology also allows users to remove commercials entirely. This feature has been controversial for the last decade.Major television networks and movie studios claiming that it violates copyright and should be banned.

CCTV Video Security Camera Systems is closed circuit television.CCTV Video Security Camera Systems.tv is different from broadcast television .because all the equipment is directly connected together with cables or wireless transmitters that can not be received by standard television as equipment..CCTV is increased in the areas where increased need for security, such as banks, airports and town centres.cctv was generally developed in banks for increased security but now after time in general video surveillance and home security it is also used.

A basic CCTV system comprises of the following;

Camera, lens and power supply.

Recording device, VCR or a digital video recorder.

A monitor.

Wiring

The primary work of a cctv camera is to convert light into a video signal,.All cctv cameras require an optical lens to focus the light onto an image sensor located directly behind the lens inside the cctv camera.Different types of cctv cameras are Board Cameras,C Mount Cameras,IR Cameras,IP Cameras,Zoom Cameras,Speed Dome Cameras.All cctv camera requires optical lenses.The function of the lens is to limit and focus light at the image sensor of the cctv camera. A lens can automatically control the amount of light that reaches the imaging sensor, are used in where amount of light vary and varying weather.

by: Rajib

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