Video Card Dual Monitor
Analog Video Surveillance System
Video Cassette Recording (VCR)
Today, the security camera system can consist of many different products and technologies. Many suppliers build pieces of the system, if it is part of a hybrid analog / digital or application of end to end IP network solution. The following sections explain the evolution of the system of closed circuit television, starting with a fully analog and adding components until it achieves the network capacity.
A traditional analog surveillance system consists of analog cameras, players time lapse video and monitors. A coaxial cable runs from each camera to a multiplexing device that allows multiple cameras to record for a device video, with a monitor for display. The time lapse VCR allows the operator to adjust when the video records for the VHS standard two hours can used for much longer. The compensation results in lower quality images for less frequent tape changes or overwrite the image.
Devices recording systems closed circuit television have been the basis for surveillance and monitoring of the last twenty years. This technology is very old and obsolete and is being rapidly replaced by digital recording technology, which now represents over 80% of all new installations.
Digital Video Recording (DVR)
A DVR is a computer with a special video graphics card that connects to an analog camera through 75 ohm coaxial cable. The card also converts the analog signal to digital signal and compresses the image resulting so it can be stored on an internal hard drive, viewed or transported through a network. DVR commonly used computer operating system like Windows or Linux along with the video Management System (VMS) software. DVRs are controlled and accessed via keyboard, mouse and external monitor settings to run the surveillance software and play stored video. DVR usually have internal Ethernet LAN or WAN attachments.
Network-Attached Digital Video Recorder (nDVR)
A Networked PC Digital Video Recorder is a party and party "Network Appliance" A nDVR is very similar to a DVR and is sometimes called "Network Appliance", because that does not require registered keyboard, mouse or video monitor. The device is connected directly to an Ethernet switch and the only way to access the device via the network. The device has an operating system yet, but that resides in the firmware recorded on a chip on the motherboard. Most of these NDVRs rely on video management software (VMS) loaded on a PC connected to the customer's network, however, some have 'embedded' in other chip motherboard, which is accessible from any PC via an Internet browser. Most of these products have internal hard drives for local storage video files, but can be interconnected with Arrays Direct Attached Storage (DAS), Network Attached Storage (NAS) equipment or storage area networks (SAN) through LAN or WAN.
Network Video Recorders (NVR)
The "pure" Network Video Recorder (NVR) is not a "turn-key box" or network device, but created with a combination of network devices. An NVR can be a standard network server with internal storage or attached, together with the software recording, video surveillance system or communication software and video analysis, possibly even intelligent software. Digitization of analog video is made by an independent 'Video Video Encoder "or" Server "which is also attached to the Ethernet / IP. Using a configuration of NVR, a network cameras can act as video servers and the input images directly to the NVR and will be managed directly by the NVR video software.
Video Encoders & Decoders
Encoders are used to take video signals in analog form or digital and make them suitable for transmission in a bandwidth or storage capacity is a problem. Consolidation applies to many applications where video surveillance system digital recording devices are used or viewed through a network is desired. Analog signals must first be converted to a digital format, but then every source must be compressed into a smaller size video file or "stream". There are several standards for encoding / decoding and compression each has advantages and disadvantages. Usually the advantages and disadvantages are quality for reduced file size.
A decoder is a device that makes it Instead of an encoder, the annulment of the encoding for the original information can be retrieved. The same method used for encoding is usually only invests in order to decipher. These are still relatively simple devices that can be a software program running on a PC, DVD player or even a phone cell. They can also be hardware devices that have digital video format and convert it back into an analog signal that can be displayed on a monitor television. This allows the network video to be changed through any output device. Normally the decoding and encoding functions of residence on the same device and is commonly referred to as a codec "," an acronym for code / decode.
Migration to a digital network solution
Because there is a significant financial investment in analog CCTV, administrators security of many opt for a gradual transition to IP, mixed analog and digital security technologies whenever possible during the migration. Integrate an existing analog equipment with products that provide the functionality of a digital system offers several advantages:
Remote Access
Cost-effectiveness
Flexibility
Scalability
In the simple illustration below, analog cameras are connected to an analog video switch, an analog monitor, a VCR and a video server. This configuration provides traditional sequential control and recording of multiple analog cameras. When connecting a video server to convert analog video into digital data, images can be sent over an Ethernet / IP (through a router / switch), which provides Ethernet network connections for IP cameras. With this configuration, the security personnel authorized local or remote locations can watch the video from both analog and digital network IPcameras.
In the transition from analog to digital surveillance systems, no system is too small or too tightly tied to analog technology do not benefit from some degree of digital technology.
In conclusion, the migration of a digital network solution to your existing system analogy can be made and still have the ability to add the latest software and hardware.
Some of the latest system software security surveillance sensor is twice below in more detail.
The last camera systems would be a network camera combanation cameras and high-end analogy.
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