Video Encoders & Decoders
Encoders are used to take video signals in analog or digital form and make them suitable for transmission where bandwidth or storage capacity is an issue. Encoding applies to many video surveillance system applications where digital recording devices are used or viewing across a network is desired. Analog signals must first be converted to a digital format, but then each source must be compressed into a smaller size file or video "stream." There are several standards for encoding/decoding and compression; each has advantages and disadvantages. Typically the trade-offs are quality for reduced file size.
A decoder is a device that does the reverse of an encoder, undoing the encoding so that the original information can be retrieved. The same method used to encode is usually just reversed in order to decode. These are still relatively simple devices which can be a software program running on a PC, a DVD player or even a cell phone. They may also be hardware devices that take the digital video format and convert it back into an analog signal that can be displayed on a TV monitor. This allows the networked video to become switched across any output device. Usually the decoding and encoding functions reside in 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 significant financial investment in analog CCTV, many security managers opt for a phased transition to IP, blending both analog and digital security technologies wherever possible during the migration. Integrating existing analog equipment with products that provide the functionality of a digital system offers several benefits:
Remote accessibility Cost-effectiveness Flexibility Scalability
In the simple illustration below, the analog cameras are connected to an analog video switcher, an analog monitor, a VCR and a video server. This traditional setup provides sequential monitoring and recording of multiple analog cameras. By connecting a video server to convert the analog video into digital data, images can be sent over an Ethernet/IP network (through a router/switch) which provides Ethernet connections for networked IP cameras. With this configuration, authorized security personnel in local or remote locations can view video originating from both analog and digital, networked IPcameras. In the transition from analog to digital surveillance systems, no system is too small or too tightly tied to analog technology not to benefit from some measure of digital technology.
In conclusion the migration of a Digital Network Solution to your existing Analogy System can be done and still have the capability to add the latest software and hardware. Some of the latest in security surveillance system software is the Dual Sensor as listed below in more detail.
The latest camera systems would be a combanation of network camera and high end analogy cameras.
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