Long range image signal transmitting system based on SPI and RS422 bus

Abstract

The invention relates to a long range image signal transmitting system based on SPI and RS422 bus, and belongs to the field of the video and image transmission. The long range image signal transmitting system overcomes the restricting problems in the prior art that video and image signal of equipment such as an unmanned turntable needs to be transferred through a conducting ring, low anti-interference capability in image transmitting of SPI bus when the requirement for transmission distance is high, and overabundant in Cameralink bus data lines. The system comprises a SPI input mainframe, two serial-parallel conversion modules, two parallel-serial conversion modules and a SPI output subordinate computer. When transmitting video and image, video and image are inputted into the SPI input mainframe in two ways, namely, a clock signal and an image data signal. After receiving the two ways data, the two serial signals are converted into RS422 format differential signals by the two serial-parallel conversion modules, and then the RS422 format differential signals are outputted. The received RS422 differential signals are converted back into SPI serial data format by the two parallel-serial conversion modules, and then are sent into the SPI output subordinate computer to complete the image transmission task.

Description

technical field [0001] The invention relates to a long-distance image signal transmission system based on SPI and RS422 buses, belonging to the field of video image transmission. Background technique [0002] The SPI (Serial Peripheral Interface-Serial Peripheral Interface) bus mechanism circuit design is simple (the number of signal lines is small), and it is easy to use, so it is widely used in the field of data communication. In many advanced image processing integrated chips, the SPI bus is also used as a standard configuration. When transmitting video images, the SPI bus only needs two lines of clock and signal, so SPI is also used to transmit images in systems with short distances or excellent electromagnetic environments. The biggest problem with the SPI bus is its poor anti-interference ability, and the effective transmission distance is less than 5 meters. In the field of UAV photoelectric turntable and other fields, the image transmission is mostly completed by t...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the constraints of poor anti-interference ability of SPI bus transmission image and too many Cameralink bus data lines when the video image signal needs to be transferred through the conductive ring and the transmission distance is relatively high in the existing UAV turntable and other equipment, the present invention proposes a A long-distance image signal transmission system based on SPI and RS422 bus

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