What is the classification of matrix matrix?
The video matrix refers to an electronic device that arbitrarily outputs m video signals to an n-channel monitoring device by means of array switching. In general, the input of the matrix is ​​greater than the output, ie, m>n. Some video matrices also have an audio switching function that can switch video and audio signals synchronously. This matrix is ​​also called an audio and video matrix. The current video matrix has two major categories of analog matrix and digital matrix in terms of its implementation method. Video matrix is ​​generally used in various monitoring situations.
Classification of video matrices
The video matrix is ​​divided into an analog matrix and a digital matrix in different ways of implementing video switching.
Analog matrix:
Video switching is done at the analog video layer. Signal switching is mainly achieved by using a single-chip microcomputer or a more complex chip-controlled analog switch.
Digital matrix:
Video switching is done at the digital video layer, and the process can be either synchronous or asynchronous. The core of the digital matrix is ​​the processing of digital video. It is necessary to add AD conversion at the video input end, convert the analog signal into a digital signal, add DA conversion at the video output end, and convert the digital signal into an analog signal output. The core part of the video switching is changed from the analog switch of the analog matrix to the processing and transmission of digital video.
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.
2, video output module
The switched audio and video signals are processed again to meet the signal input requirements of the display or recording device.
3, the central control module
This module is the control core of the matrix switching system, and is generally composed of a CPU (MCU microprocessor), a memory, a communication chip, a Chinese character library chip, and the like.
4, the alarm module
The alarm module is used to detect the alarm input, and usually the other CPU will do the alarm detection processing.
Video matrix switching principle and technical details
Output 1 input 1, output 2 input 2, and output 3 output 4 input 3, or each output can be selected "independently" in the input, without having to care about the output of other channels, that is, different from other outputs , can also be the same. For example, 8 to 4 means that there are 4 independent outputs, each of which can be selected from 8 inputs, or 4 independent 8 to 1, but only 8 inputs are the same. Often confused with this is the concept of allocation, such as 8 choices of 1 minute 4, which means that one output is selected from 8 inputs and is assigned to 4 identical outputs, although there are 4 outputs in appearance. But the four outputs are the same, not independent. In general practice, the structure that forms M×N is called a matrix, and the structure of M×1 is called a switch or a selector. In fact, it is only N1, and most of the discussion is treated as a matrix.
The function of the matrix switcher is to independently select multiple (including one) signals for output according to the needs of multiple signal inputs to complete the signal selection.
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