A Cascading Method Based on Twisted Pair Video Transmission
A video transmission and cascading technology, used in cable transmission adaptation, color TV parts, TV system parts, etc., can solve problems such as inability to display, insignificant influence, image effect deviation, etc., to achieve user-friendly, solution The effect of crosstalk
Active Publication Date: 2017-09-26
SHANDONG CHAOYUE DATA CONTROL ELECTRONICS CO LTD
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Problems solved by technology
[0002] When VGA video is transmitted over a long distance using a VGA cable, the external electromagnetic interference can be solved by using the shielding layer to shield the ground, wearing a metal tube, etc.; but the internal interference of the VGA video signal itself cannot be solved well. The RGB three primary color signals are all unbalanced signals. During the transmission process, they will radiate radio waves to the outside, and then cause mutual interference. In short-distance transmission, this effect is not obvious; but as the distance increases, this interference becomes stronger and stronger. In the end, the image effect will be obviously deviated, or even not displayed at all.
In addition, when cascading, the keyboard and mouse signals are transmitted by I2C, which will be greatly limited by the transmission distance.
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[0017] Below with reference to accompanying drawing, the present invention is further described by specific implementation method:
[0018] A cascading method based on twisted-pair video transmission. The entire cascading circuit realizes the encoding and decoding of differential video signals and RS485 signals through ISL59311, ISL59921 and ISL59911 related circuits, and at the same time completes the USB keyboard and mouse through the related control of MCU and CPLD cascade.
[0019] Described cascading method comprises steps as follows:
[0020] A. The RED, GREEN, BLUE, VSYNC and HSYNC output by the server A management unit are encoded by ISL59311 to generate differential signals, and the signal SDATA controlled by MCU and CPLD is converted into RS485+ and RS485- signals through ISL59311, and then transmitted to the other side through the network a server management unit;
[0021] B、服务器B管理单元接收到网络视频信号后经过ISL59911解码分别生成RED_JI_59911、GREEN_JI_59911、BLUE_JI_59911、VSYNC_JI_59911...
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The invention discloses a cascade mode based on twisted-pair video transmission. The cascade mode based on the twisted-pair video transmission is characterized in that coding and decoding of differential video signals and RS485 signals are achieved in a whole cascade circuit through related circuits of an ISL59311, an ISL59921 and an ISL59911, and cascade of a USB keyboard and a USB mouse are completed through related control of an MCU and a CPLD. According to the cascade mode based on the twisted-pair video transmission, VGA video signals are transmitted by using balance differential signals to achieve cascade management among servers. Compared with a traditional mode, great advantages are achieved, the problem of crosstalk of VGA videos is solved thoroughly and technologically, management of the cascade servers at longer distances can be achieved, and great convenience is brought to users.
Description
technical field [0001] The invention relates to the design of a novel device management technology of a multi-unit server based on twisted-pair video transmission. technical background [0002] When VGA video is transmitted over a long distance using a VGA cable, the external electromagnetic interference can be solved by using the shielding layer to shield the ground, wearing a metal tube, etc.; but the internal interference of the VGA video signal itself cannot be solved well. The RGB three primary color signals are all unbalanced signals. During the transmission process, they will radiate radio waves to the outside, and then cause mutual interference. In short-distance transmission, this effect is not obvious; but as the distance increases, this interference becomes stronger and stronger. Eventually, the image effect will be obviously deviated, or even not displayed at all. In addition, when cascading, the keyboard and mouse signals are transmitted by I2C, which will be g...
Claims
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IPC IPC(8): H04N7/10H04N5/222
Inventor 朱忠客朱书杉
Owner SHANDONG CHAOYUE DATA CONTROL ELECTRONICS CO LTD