Talking about Definition of HD-CCTV HD Monitoring What is HD-CCTV
HD-CCTV was proposed by several chip and system suppliers in 2009 for the application of High Definition Surveillance Systems to jointly develop a new standard. Its horizontal resolution and vertical resolution are about twice that of current analog color television systems, and the 16:9 aspect ratio digital television system has a resolution of about 800 television lines or more, and a resolution of at least 1280x720.
HDCCTV market is also known as closed-circuit high-definition (in its form) or digital high-definition (in its bones), but the latter is easily confused with the network HD, because some users in the past have been accustomed to analog / The numbers are different, so based on this point and considering the application as the starting point, HDCCTV will be used to make a distinction with analog/network.
What is the core technology of HD-CCTV?
HD-CCTV utilizes the SDI (Serial digital interface) link originally developed for the professional broadcast market, that is, the transmission line from the camera-DVR in the analog security system that is now widely used. A handshake protocol that defines information such as video resolution and frame rate for high-definition video transmission. Such a digital HD video transmission mode (HD-SDI) is the most important basic core technology in HD-CCTV.
Currently, the mainstream HD-SDI resolution on the market is 720p (1280x720)/1080p (1920x1080). Most of the interfaces use the BNC interface to output the video line, but there are also direct fiber interfaces. The application of optical fiber is expected to be significant in the high-definition era. Grow, its frequency bandwidth, low loss, anti-interference, light weight and high scalability, this trend is worth attention.
What are the transmission interfaces of HD-CCTV?
The HD interface in the real sense includes HD-SDI, YPbPr, HDMI, and DVI. From the figure below, you can clearly see the advantages of the HD-SDI interface in the current high-definition digital interface. The HD-SDI interface is currently a better HD interface. At the same time, the HD-SDI interface is also the current high-definition industry standard HD interface.
HD-SDI Glossary
HD-SDI is a broadcast-grade HD digital input and output port. SID (Serial Digital Input) is a serial digital interface that is used to transmit uncompressed digital video signals; HD (High Definition) is a high-definition signal. HD-SDI is an interface specification transmitted under the condition of a signal rate of 1.485 Gb/s or 1.485/1.001 Gb/s according to SMPTE292M. This specification specifies data formats, channel coding methods, signal specifications for coaxial cable interfaces, connectors and cable types, and fiber interfaces. HD-SDI interface uses coaxial cable and BNC interface as cable standard. Effective distance 100 meters
HDMI Glossary
High Definition Multimedia Interface (English: High Definition Multimedia Interface, HDMI) is a digital video/audio interface technology. It is a dedicated digital interface suitable for image transmission. It can simultaneously transmit audio and video signals. The maximum data transmission speed is 5 Gbps. At the same time, it is not necessary to perform digital/analog or analog/digital conversion before signal transmission. HDMI can be combined with Wideband Digital Content Protection (HDCP) to prevent unauthorized copying of copyrighted audio and video content. The additional space provided by HDMI can be used in future audio and video formats. And because the demand for a 1080p video and an 8-channel audio signal is less than 4 Gbps, HDMI has a large margin. This allows it to use one cable to connect the DVD player, receiver and PRR, respectively.
