At present, analog video matrix systems are welcomed by the market, so do you know the principle? Today Xiaobian introduces the working principle of the analog video matrix system.
At present, the matrix used in security is mostly an analog video matrix, which is mainly used for switching and distributing analog video signals. Generally, it is composed of a video matrix host and one or more control keyboards, and the matrix host contains audio and video. Input module, audio and video output module, central control module, alarm module, power module, etc.; control keyboard consists of buttons, display, joystick, and permission control lock.
The role of each module of the video matrix:
1. Video input module: It isolates, buffers and amplifies the input analog video signal. The main purpose is to convert the video signal into a signal that meets the switching requirements. The common video signal buffer isolation circuit adopts the form of the in-phase amplifying circuit composed of discrete triodes, and also uses the integrated circuit chip to buffer and amplify the video signal.
2. Video output module: The audio and video signals after switching are processed again to meet the signal input requirements of the display or recording device. Common video output modules need to perform amplitude amplification, character superposition and other processing on the input video signal. The character superimposing chip has UPD6450 (only superimposed English letters), UPD6453, and Fujitsu's MB90092 of Japan NEC Corporation.
3. Central control module: This module is the control core of the matrix switching system. It is generally composed of CPU (MCU microprocessor), memory, communication chip, Chinese character library chip and so on.
4. Alarm module: The alarm module is used to detect the alarm input, and usually the other CPU will do the alarm detection processing.
After understanding the components of the analog video matrix system, I believe you have a better understanding of it.
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