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Article tell SD-SDI | HD-SDI | 3G-SDI | 6G-SDI | 12G-SDI

First, we need to understand what SDI is. The so-called SDI, the English name is Serial Digital Interface, SDI interface is the acronym of serial digital interface, It is a digital video interface standard developed by SMPTE(Society of Motion Picture andTelevision Engineers).


SDI interfaces can be roughly divided into SD-SDI(270Mbp, SMPTE259M),HD-SDI(1.485Gbps,SMPTE292M) and 3G-SDI(2.97Gbps,SMPTE424M). It can be seen from this division standard that rate is an important index.


Hd-sdi is HD digital component serial interface. HD-SDI is a real-time uncompressed high-definition radio and television camera, which is another scientific and technological progress in the field of security monitoring and provides high-definition image source equipment for the monitoring center. HD-SDI camera, based on SMPTE (Society of Motion Picture and Television Engineers) serial link standard, through 75 ohm coaxial cable to transmit uncompressed digital video is a high-definition real-time camera.


3G-SDI signal has been widely used in the radio and television industry. With the continuous development of the security industry, its advantages of high speed and uncompressed digital have been gradually tapped. At present, Huanzhan Technology has launched a large number of 3G-SDI series products, including SDI-HDMI conversion box, SDI repeater, SDI HD video acquisition card and SDI video signal splitter. These devices all use 3G signals and are also compatible with 1.5G signals for long-distance transmission, which can meet the diversified needs of users.


Article tell SD-SDI | HD-SDI | 3G-SDI | 6G-SDI | 12G-SDI - Sony Camera Information - 1

3G-SDI interface board


Hd-sdi HD digital video optical terminal can simultaneously transmit 1 channel HD-SDI HD digital video signal and reverse control data signal through single-mode optical fiber, and also support 1 channel HD video signal through loop on the sending end.


Plug and play, simple installation, without circuit and optical path adjustment can complete equipment installation, is currently with high reliability, high performance of serial digital optical transmission equipment.

Article tell SD-SDI | HD-SDI | 3G-SDI | 6G-SDI | 12G-SDI - Sony Camera Information - 2

Xuan Zhan technology HD-SDI optical terminal


It can be widely used in intelligent transportation (ITS), expressways, toll stations and other long-distance transmission places.


So, what is the specific difference between 3G-SDI and HD-SDI?

With the advent of high definition (HD) video standards such as 1080i and 720P, the interface was adapted to handle higher 1.485Gbps data rates. The 1.485-Gbps serial interface, often referred to as the HD-SDI interface, is defined by the SMPTE292M, which uses the same 75 ohm coaxial cable. SMPTE approved a new standard called SMPTE424M, which doubles the SDI data rate to 2.97Gbps over the same 75 ohm coaxial cable. This standard, also known as 3-Gbps (3G) SDI, supports higher resolution image quality such as 1080P and digital cinema.


In terms of resolution (digital pixels), from the standard definition era to HD, from 720×576 to the current 1920×1080, aspect ratio from 4:3 to 16:9, which is more familiar to us, 4K is actually built on the basis of HD, we call it Ultra HD, From 400,000 pixels at 720×576 to around two million pixels at 1920×1080 in HD. In terms of 4K, our resolution has increased by 4 times on the basis of HD, from 1920×1080 (1080p60) to 3840×2160 (2160p60), that is, the horizontal is 1920×2, the vertical is 1080×2, the resolution has increased by 4 times, what has not changed, is the aspect ratio has not changed, Again 16:9, why is it called QFHD? Q stands for QUAD, it means 4 times, F stands for FULL, it means 4 times full HD.


At present, there are two mainstream 4K UHD baseband signals in the market:

6G/12G-SDI digital serial UHD baseband signal for the film industry, such as for the broadcast market, application scenarios are mostly in TV stations, studios, etc. Parallel HDMI1.4/2.0 ultra HD baseband signals for consumer terminals, such as consumer cameras, game consoles, HD digital set-top boxes and other digital video output, the following focuses on the digital video SDI interface.


SMPTE organization officially released 6G-SDI and 12G-SDI of serial data interface in 2015. 6G-SDI is designed for 2160p30 applications and corresponds to 30 frames per second refresh. 12G-SDI is for 2160p60 (commonly known as true 4K) applications, corresponding to 60 frames per second refresh.


By virtue of its own technical advantages and years of SDI interface board development experience, Xuanzhang Technology has developed 12G-SDI interface board according to the general standard of 12G-SDI, so as to better meet the requirements of 4K-60 frame video transmission application.


Article tell SD-SDI | HD-SDI | 3G-SDI | 6G-SDI | 12G-SDI - Sony Camera Information - 3

12G-SDI coded control board


The 12G-SDI interface board developed by Xuanzhan Technology has the following advantages:

(1) Downward compatibility

The 12G-SDI interface board of Xuanzhan Technology can not only support 4K*60Hz signal acquisition, but also be downward compatible with 6G-SDI and 3G-SDI signals.


(2) Small volume

Because the number of signal connections is reduced by four times, the 12G-SDI code board can effectively simplify the cable connection and wiring system, eliminate the complexity of wiring, reduce the total weight of the cable, and reduce the possible failure points of signal connections.


(3) HD without delay

High coding efficiency, in the high compression ratio at the same time, but also to ensure high-quality image output effect, effectively prevent the occurrence of original image distortion phenomenon.

12G-SDI interface board of Xuanzhan Technology supports SONY ultra HD movement FCB-EW9500H, FCB-ES8230, FCB-ER8530, FCB-ER8550, FCB-ER8300.





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