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What is DVR ? | Details analysis and Specification of Digital video recorder.

DVR (Digital Video Recorder)

DVR is a part of a closed-circuit system. It stands for digital video recorder, which is a device that records video in a digital format to a storage device such as a Hard Disk, SD memory, or another storage device, sometimes a personal computer used for storing the video. But generally, DVR stores video from the camera to a hard disk drive. The video of the Analog camera is encoded and processed in the DVR.

History of DVR:

Surveillance of dangerous places like rocket launchers, for space research, industries and research and development purposes we need the CCTV system. The first consumer DVR came in the market name as PVR(personal video recorder) in 1999 in a technology expo in America. At the same time, Microsoft also launched a DVR capability device with the help of Microsoft software, but the consumer market was not available till 2000.




 " A modern DVR in the above picture "


Types of DVR: 

There are three types of digital video recorders.

Embedded DVR: 

An embedded DVR is a standalone piece of equipment or technology that accepts Analog CCTV camera video for compression and is stored on a local HDD. 
Hikvision DS-720X series DVR is the best example of an embedded DVR.

Hybrid DVR or XVR:  


Hybrid digital video recorders support Analog cameras as well as a small number of network cameras. It comes with an embedded processor and supports compression technologies H.265 and H.265+.
The Dahua XVR series is the best example of a Hybrid DVR.

PC-based DVR: 

It is integrated with hardware and software. Any personnel computer upgraded with a DVR card, network card and extra video board can work as PC PC-based digital video recorder.
PC-based DVR is high in cost but one advantage is to increase storage capacity very easily by adding extra hard disk.

Application of DVR:

  1. Digital Video Recorder is a good option for small shops, Restaurants, Coffee outlets etc. because it is cost-effective and easy to install.

  2. In my opinion, DVR is the best option for the home because most houses do not wire CCTV cables during building the house. Coaxial cable is best for outdoor wiring because it is hard, rigid and durable. It is nearly weatherproof for 3 to 5 years.

  3. DVR is also the best suitable surveillance device for small businesses like Poultry farms, Goat farms, and farmhouses.


Understanding the installation structure of the DVR and camera in the below Image.


 

 " Arrow represents the coaxial cable directly connecting all cameras with DVR"



Differentiate between the Advantages and Disadvantages of DVR:-



Advantages of DVR

Disadvantages of DVR

DVR system is cheap/low cost in comparison to NVR.

DVR does not support IP /Wireless cameras.

DVR is technically easy to install and program.

Coaxial cable does not provide power so we need another cable for power supply to every camera.

Low data consumption.

A limited number of camera support.

Due to low frame rate video processing, there is no video lag.

A DVR can commonly support a maximum of 32 cameras.

Low maintenance.

DVR system is also not very good at cable management because the coaxial cable is more rigid and also has more width.

There is no need for switches multiplexors or any middle devices.

It has a limited number of audio ports. So some of the cameras can only record the video.

All Cameras are directly connected to the DVR.

DVR work with coaxial cable will decrease the quality of the video after 100 meters.

There is no need to provide every camera’s a single IP address.

DVR does not support a high level of application such as License plate recognition or facial recognition.



Conclusion : 


In the end, What is the best surveillance system for your business or your home, you should have to consult with a security professional?






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