SDI multi-level retiming real-time transmission device and transmission method
A real-time transmission and retiming technology, applied in closed-circuit television systems, selective content distribution, electrical components, etc., can solve the problems of high cost of debounce technology and chips, increase the complexity of transmission equipment design and equipment power consumption, etc., to achieve Reduce design cost, improve system stability, and reduce device power consumption
Active Publication Date: 2019-04-23
杭州中葳数字科技有限公司
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Problems solved by technology
In this process, the cost of debounce technology and chips is very high, and the design complexity and power consumption of transmission equipment are additionally increased, especially for multi-channel SDI transmission defects.
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[0025] Further description will be given below in conjunction with specific embodiments and accompanying drawings.
[0026] Assume that the error of the local clock is 100ppm, that is, the error between the local clock and the data recovery clock is 1 / 10,000. Indicates that in the BT1120 format, if the local clock is used to retransmit data, then within 10,000 data, one byte must be transmitted repeatedly or one byte will be transmitted less. Taking 1080p@25Hz as an example, one line has 2640 bytes, so a transmission error will occur after 3.78 lines are transmitted. See formula a for the calculation scheme.
[0027]
[0028] Among them, l represents the number of error interval lines, p represents the accuracy error between the local clock and the recovered clock, w represents the number of bytes in a line of the specified video format, p1 represents the local clock, and p2 represents the recovered clock. According to the calculation of Formula 1, it is easy to calculate...
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The invention discloses a SDI multi-stage re-timing real-time transmission apparatus and a transmission method thereof. A SDI transmission protocol is changed into a general SDI transmission protocol CSDI (Common Serial Digital Interface). The novel protocol defines last bytes in a horizontal row blanking zone as redundancy bytes. An original rigorous protocol format is broken so that a certain quantity of the redundancy bytes is arranged between rows. Simultaneously, a local clock is used to retransmit data. In a redundancy byte interval, the number of bytes is added and deleted conditionally according to a relation of the local clock and a recovered clock so that a purpose of being synchronous with a new clock under the condition that information is not lost is reached. During multistage retransmission, in order to prevent disappearance of the redundancy bytes, the redundancy byte interval needs to be determined and coordinative distribution of operations of deleting the bytes among rows is controlled. In addition, in a multipath SDI transmission system, design cost and equipment power consumption are greatly reduced and system stability is increased.
Description
technical field [0001] The invention relates to an uncompressed high-bandwidth transmission system in the field of video monitoring, in particular to an SDI multi-stage retiming real-time transmission device and a transmission method. Background technique [0002] At present, the video surveillance system is mainly divided into front-end video imaging, intermediate optical fiber transmission, center matrix platform switching, and back-end large screen on the wall. For the transmission of provinces, cities and counties, matrix cascading is required. With the continuous improvement of customers' requirements for image quality and continuous breakthroughs in imaging and transmission technologies, the field of video surveillance has entered the era of digital high-definition. Front-end imaging has generally reached 1080p resolution, and is rapidly moving towards 4K. In order to ensure the best image reproduction, uncompressed video transmission has become the choice of everyone...
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IPC IPC(8): H04N7/18H04N21/236H04N21/434
CPCH04N7/18H04N21/23602H04N21/4342
Inventor 石旭刚叶挺史故臣周骏华伍一帆
Owner 杭州中葳数字科技有限公司