HDcctv (
High Definition
High definition or HD may refer to:
Visual technologies
*HD DVD, discontinued optical disc format
*HD Photo, former name for the JPEG XR image file format
*HDV, format for recording high-definition video onto magnetic tape
* HiDef, 24 frames-pe ...
Closed Circuit Television
Closed-circuit television (CCTV), also known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the signal is not openly t ...
) is an open industrial standard for transmitting uncompressed high-definition analog (AHD) or
digital video
Digital video is an electronic representation of moving visual images (video) in the form of encoded digital data. This is in contrast to analog video, which represents moving visual images in the form of analog signals. Digital video comprises ...
over
point-to-point coaxial cable
Coaxial cable, or coax (pronounced ) is a type of electrical cable consisting of an inner conductor surrounded by a concentric conducting shield, with the two separated by a dielectric ( insulating material); many coaxial cables also have a p ...
links for
video surveillance applications.
HDcctv uses the
SMPTE HD-SDI protocol and can transmit
720p or
1080p
1080p (1920×1080 progressively displayed pixels; also known as Full HD or FHD, and BT.709) is a set of HDTV high-definition video modes characterized by 1,920 pixels displayed across the screen horizontally and 1,080 pixels down the screen vert ...
video over at least 100 m of
RG59
RG-59/U is a specific type of coaxial cable, often used for low-power video and RF signal connections. The cable has a characteristic impedance of 75 ohms, and a capacitance of around 20pF/ft (60pF/m). The 75 ohm impedance matches a dipo ...
cable.
The HDcctv Alliance is a non-profit, global consortium that develops and promotes the HDcctv standard. Advantages over
IP video surveillance
An Internet Protocol camera, or IP camera, is a type of digital video camera that receives control data and sends image data via an IP network. They are commonly used for surveillance, but, unlike analog closed-circuit television (CCTV) cameras, ...
are claimed to include low
latency and zero configuration.
Devices incorporating HDcctv interfaces include video cameras,
DVRs and repeaters.
Cabling
One of the main advantages of HDcctv is that it does not require significant modification for existing
CCTV
Closed-circuit television (CCTV), also known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the signal is not openly t ...
systems designed for analog cameras originally using composite
NTSC or
PAL video, for which extensive cabling and labor was invested for installation of the original analog system.
Since the coaxial cables originally used for the analog system have significant unused data spectrum available, it is a simple matter to just replace the camera and the recorder to obtain nearly seven times higher detail (1920x1080 vs 640x480) than the original camera system. Since coaxial cable is capable of carrying a hundred
HDTV channels simultaneously, there is still more unused data capacity available for future resolution improvements.
References
*
Resource for High Definition CCTV News & Applications
Surveillance
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