Security Camera Systems DVR
Security Camera System DVR, or Digital Video Recording, has some amazing new high quality technology today. A lot of the technology that is used in security camera DVR’s has been adapted from the personal computer industry.
How does a DVR work?
The modern digital video recording surveillance and security systems are basically plug and play items that are used in computers. The different components are not made by only one manufacture, but can be made by different manufacturer and can work with each other. As a result this provided great versatility in the application systems as Digital Video Recording (DVR) security cameras no longer need to use the same components to be operational. A good example is an 8 channel system could have 6 bullet cameras made by one manufacturer and the 2 Pan-Tilt-Zoom cameras made by a completely different manufacture and will work together.
DVR security cameras are many and varied but the basic way they work is to transfer reflecting light in the ‘field of vision’ which is then channeled into the electrical impulses, these are capable of being manipulated, as well as being measured, and then compiled to create a digital video file. This information will then be sent to the Digital Video Recorder monitor for viewing and processing.
The camera works using one of two electronic types of sensor chips, these electronic chips are known as complementary metal oxide semiconductor (CMOS) or a charge coupled device (CCD), these two work in different ways but create the same end product, creating electrical data that can be used to create a DVR file.
The Camera accomplishes this using its lens and focusing on the ‘field of view’ onto one of the chosen chips, these can range from ¼” to ½” square. When the light strikes a sensor chip, a small electrical impulse is created by the pixels in the chip. Each is capable of being measured and is used to create the data that is used to display the ‘field of view’ as a digital video.
The signal is in analog, the camera will then send the analog data through processor chip, called an analog-to-digital, which then converts the data into binary or digital format. The camera can make fine adjustments to the data by the use of a Digital Signal Processor (DSP) chip. Once this digital information is ready it is then sent through a video transmission cable, or other methods, to the DVR.
When the has signal reached the DVR, it will apply its built in DSP technology together with a COmpression.DECcompression (CODEC) utility. CODEC uses a special algorithm program that will reduce this very large file into a fraction of the original size and will not sacrifice on the quality. Once this is completed the file is then saved on the DVR’s hard disk or can be displayed on a monitor.
Purchasing a DVR security camera
Price can dictate the decision to purchase a DVR security camera, the prices can be between $600 up to $5,000, this vast difference in price is dictated by various factors, such as the number of supported camera in the system, the compression technology, how many frames per second, how much hard drive space, remove viewing or network connection capability, scheduling, motion detection, and its ability to be able to save the data into an audio, video, flash drive or CD. A color CCD security camera can contain storage of up to a terabyte.