6G sdi/12g SDI Baseband signal uncompressed transmission scheme introduction

Cognitive Digital pixel resolution:   First from the resolution (digital pixel) perspective, from the SD ERA to HD, from 720x576 to the present 1920x1080, aspect ratio from 4:3 to 16:9, this is familiar to us, 4K is actually built on the basis of high-definition, We call it the "Ultra HD" UltraHD, from the 720x576 400,000 megapixel to the 20 million pixels of HD 1920x1080. By 4K, our resolution has risen 4 times times on a high-definition basis, from 1920x1080 (1080p60) to 3840x2160 (2160P60), which is the horizontal 1920x2, the vertical is 1080x2, the resolution has risen 4 times times, what has not changed, Is the aspect ratio has not changed, or 16:9, why is called Qfhd,q is Quad, it refers to 4 times times, F is full, is 4 times times the full HD.       There are two main 4K Gao Qingqi with signals on the market:   6G/12G-SDI Digital serial ultra-Gao Qingqi with signals for the film industry, such as for broadcast-grade markets, where the application scenario is more , studio, etc. parallel hdmi1.4/2.0 for consumer terminals Gao Qingqi with signals, such as consumer level cameras, game consoles, high-definition digital STB and other digital video output, the following digital video SDI interface highlights.   Digital Video SDI interface: Digital videos SDI interface:  SDI interface is the first acronym for the serial interface of the numeral components (serial digital Interface), is by the SMPTE (Society of M Otion picture and television Engineers) a digital video interface standard developed by the organization. SMPTE is an international organization dedicated to the production of SDI standards, which are currently being developed by all SDI standards.   The serial interface is the interface that transmits each bit of the data word and the corresponding data through a single channel sequence. Because the data rate of the serial digital signal is very high, it must be processed before transmission, it belongs to the digital baseband signal. The SMPTE organization formally released the 6G-SDI and 12G-SDI of serial data interfaces in 2015. 6G-SDI for 2160P30 applications, corresponding to 30 frames per second refresh. and 12G-SDI for 2160p60 (commonly known as true 4K) of the application, corresponding to the 60 frames per second screen refresh.  

Standard Standard	name Name	Release Time Release Time	Operating Rate Operating Rate	Digital Video Format Digital Video Format
SMPTE 424M	3g-sdi	2006	2.97 gbit/s	1080p60
SMPTE ST-2081	6g-sdi	2015	6 gbit/s	2160p30
SMPTE ST-2082	12g-sdi	2015	gbit/s	2160p60 (True 4K) 2160p60 (True 4K)

The 4K Ultra HD TV ecosystem includes: 4K Ultra Gao Qingqi with signal application scenario, 4k chip source production process:Film industry and radio stations and other scenes for 4K program recording, most of the use of professional 4K HD camera and system, the current market of high-definition 4K professional cameras using 4-way BNC simultaneously transmit 12G SDI high-definition signal, belong to 4x 3G-SDI parallel mode, such as Sonypmw-f55 This digital video interface is currently used in 4K cameras. is currently 4K high-definition video, in the retransmission test 60 meters high-quality cable or can meet the transmission, 3G SDI signal all the way to 60 meters close to the limit, otherwise the image quality will be problematic. Why choose the easy-flying 4x 3G-SDI Fiber Extender. In the test, we should pay attention to the compliance of baseband signal mapping format on SDI, the rationality of transmission delay between SDI, and the compliance of the SDI interface electrical characteristics. Baseband signal transmission usually using SDI interface or fiber interface, including single link, dual link, 4 links and other forms, at this stage, China's 4K baseband digital signal most of the 4 link 3Gbps SDI transmission form, therefore, the test is mainly for the 3Gbps SDI signal data format, interface electrical characteristics and 4 3Gbps SDI channels between the delay difference, due to signal processing and physical transmission and other aspects of the subtle differences, may cause 4 3Gbps SDI channels between the signal is not fully synchronized, serious can cause a picture anomaly, therefore,   Easy to fly strict testing and ensure that the signal relative delay between the channels in a relatively reasonable range.   4X 3G-SDI Optical Extension between the 4-channel fiber, can be used in the easy-flying 3G CWDM Optical module and home-made CWDM passive multiplexing module, very easy to achieve the use of a fiber transmission, easy to fly can provide a complete set of optical fiber transmission solutions. For 4K ultra-Gao Qingqi belt applications, easy to fly at the same time the development of a single 6G SDI optical module/module, and a single 12G-SDI optical module/module, will be widely used in non-compression transmission system, for example, 4K digital matrix, 4K optical transmission equipment, or even 4K cameras, as shown in the figure below.