Reverse control signal extraction device and video data collection equipment

Abstract

The invention discloses a reverse control signal extraction device and video data collection equipment. The invention mainly comprises the following steps: an extracting module obtains the voltage of a first node at a reverse control signal output end of a build-out resistor and obtains the voltage of a second node at a reverse control signal input end of the build-out resistor; on the condition that the voltage of the first node is not higher than the voltage of the second node, the extracting module extracts a reverse control signal generated in the blanking zone of video data. In this way, reverse control signals received by a video processing module are ensured to be effective. Meanwhile, according to the technical scheme of the invention, reverse control signals, outputted by the extracting module, are directly transmitted to the video processing module without any interface module or being analyzed by the interface module. Therefore, the transmission rate of reverse control signals is improved. The delay caused by the analyzing treatment of the interface module is avoided, and the efficiency of the reverse control is increased.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a reverse control signal extraction device and video data acquisition equipment. Background technique [0002] At present, there are many analog video data interfaces on the market, which can not only transmit forward video data on the coaxial line, but also transmit reverse control signals on the coaxial line. Such as figure 1 As shown, it is a frame diagram of an existing coaxial anti-control video transmission system. The coaxial anti-control video transmission system includes a camera 11 and a video storage device 12. After the video signal collected by the camera 11 is processed, it passes through a 75 ohm The coaxial cable is sent to a video storage device for subsequent use. Wherein, the camera 11 specifically includes: a video processing module 111 , an interface module 112 , a matching resistor 113 , and a comparator 114 . The reverse control signal is all sent...

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a device for extracting reverse control signals and video data acquisition equipment to solve the problem in the prior art that the interface module needs to perform video protocol analysis on the extracted reverse control signals, which cannot be sent to the The video processing module performs processing, which leads to the problem of delaying the anti-control effect

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