System for switching analog high definition video

Abstract

The invention discloses a system for switching analog high definition video, and the system comprises: an ISP processor for performing post processing on a signal transmitted by a front end image sensor; a video operational amplifier for amplifying a video signal and enhancing brightness; chroma and synchronizing signal of the video, a DVR having functions of long time video recording, voice recording, remote monitoring and controlling for image / voice; a comparator of which two inputs are analog signals and two outputs are binary signals, when the difference value of input voltage is increased or decreased, the output keeps constant, an analog voltage signal is compared with a reference voltage, and a comparison result is obtained; and an ISP processor for switching the analog high definition video according to the comparison result obtained by the comparator. According to the invention, compared with the prior art, the system decreases the software version, unifies the hardware circuit, provides convenience to an actual test and optimizes the customization requirement, a COC circuit is adopted to perform protocol matching, and the disassembling and assembling complexity of complete machine product can be effectively reduced.

Description

Technical field [0001] The present invention relates to the technical field of switching analog high-definition video, in particular to a system for switching analog high-definition video. Background technique [0002] As digital video recorders (DVR) can support mixed signals, analog high-definition cameras need to be able to support switching solutions to achieve high-definition transmission on the coaxial line of cameras (TVI) and analog high-definition cameras (AHD) and their NTSC (National Television Standards) The switching between the committee) standard camera and the television broadcasting (PAL) standard, the existing operation methods include: [0003] 1. Existing equipment cannot achieve this function, and can only distinguish analog high-definition video TVI and AHD and their NTSC and PAL formats by burning the designated software, which increases the cumbersomeness of different preparation numbers; [0004] 2. The hardware adds the menu button control line. Set the vid...

AI Technical Summary

Problems solved by technology

[0003] 1. Existing equipment cannot realize this function. Only by burning the specified software to distinguish the analog high-definition video TVI and AHD and its NTSC and PAL standards, which increases the cumbersomeness of different material numbers;

[0004] 2. The hardware adds a menu button control line. By entering the menu or specifying a long button to set the video output format of the camera, there is also an input / output (IO) configuration line through the hardware, and setting the video output format of the camera by configuring and specifying the relevant IO level This method increases hardware cost, is easy to misuse, and is inconvenient to use after installation;

[0005] 3. Enter the camera menu through the COC protocol to set the analog high-definition video output format in the DVR. This method is cumbersome to operate, and the camera adds menu logic functions, character libraries, etc., which may lead to increased hardware costs.

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