About HD HD-SDI capture card knowledge Wikipedia
Apr 28, 2018
About HD HD-SDI capture card knowledge Wikipedia
The HD-SDI interface is a "digital component serial interface". The HD-SDI interface is an acronym for serial digital interface. Introduction The HD-SDI interface is a "digital component serial interface," and the HD-SDI interface is a broadcast-grade, high-definition digital input and output port, where HD represents the high-definition signal. Because the SDI interface cannot directly transmit compressed digital signals, compressed signals recorded by devices such as digital video recorders and hard disks must be decompressed and output through the SDI interface before entering the SDI system. If decompression and compression are repeated, the quality of the image will be degraded and the delay will be increased. For this reason, various formats of digital video recorders and nonlinear editing systems specify their own interfaces for directly transmitting compressed digital signals. In the field of non-editing post production, broadcasting stations and other fields, HD-SDI is widely used. It is based on the SMPTE 292M interface specification transmitted under the condition of 1.485 Gb/s or 1.485/1.001 Gb/s signal rate. 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. The effective distance is 100M.
surveillance system
1, according to the rate: standard definition SD-SDI, HD standard HD-SDI and 3G-SDI, the corresponding rate is 270Mb/s, 1.485Gb/s and 2.97Gb/s. 2. HD-SDI interface corresponding monitoring products include HD-SDI conference camera, HD-SDI optical transceiver, HD-SDI to HDMI converter, HD-SDI hard disk recorder, HD-SDI matrix, and HD-SDI monitoring with large screen. system. 3, HD-SDI monitoring system advantages: Because the device uses BNC interface connection, which means that we are in the process of converting the existing traditional analog frame system to high-definition monitoring system, without re-wiring, just replace the front-end and back-end part This will save huge time and labor costs for the project.Ease of use Because the system framework used for HD-SDI camera product construction is the same as the frame of analog monitoring system, the system wiring can be realized with 75-5 coaxial cable, and the construction personnel and system operators do not need training and it is easier to get started. Uncompressed HD-SDI Conference Cameras Unlike IP surveillance, which transmits and compresses video signals over a network, it transmits uncompressed digital signals over coaxial cables at high speed, and the original image is not distorted. High-definition real-time HD-SDI high-definition conference camera monitoring is not affected by the transmission network, there will be no image delay caused by IP network monitoring, in real-time monitoring and high-definition requirements. High utilization rate The resolution of HD-SDI HD conference camera device video output image is 1920×1080, and the density of the conference camera per unit area is greatly reduced. Provide more details on the monitoring site, such as seeing the face and seeing the license plate.
Interface principle
