What is a video surveillance matrix?

The surveillance video matrix is ​​a complete video surveillance system device that integrates video switching, audio switching, alarm management, follow-up control, and IP network matching control. It can display any video signal of the access matrix on the monitor that you want to see. In the above, the control keyboard of the matrix can also be used to realize the camera with controllable function on the front end. The video matrix refers to the electronic device that outputs the M video signal to the N-channel monitoring device through the array switching method. The input of the matrix is ​​larger than the output, ie m>n. Some video matrices also have audio switching function, which can synchronously switch video and audio signals. This matrix is ​​also called video and audio matrix. The current video matrix is ​​implemented in terms of its implementation. There are two major categories of analog matrix and digital matrix. Video matrix is ​​generally used in various monitoring situations.

(1) The concept of monitoring video matrix

The concept of matrix refers to the concept of linear algebra in high numbers. Generally speaking, there are multiple output selections in the case of multiple inputs. The video matrix switcher is specially used to switch and distribute computer display signals, and can multi-channel signals. It is switched from the input channel to any channel in the output channel, and the output channels are independent of each other. Simply put, any one of the incoming multiple input signals can be displayed to any one of your designated displays.

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, ie Unlike other outputs, it can 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, N=1, we treat them as a matrix in the discussion.

(2) The role of monitoring video matrix

The role of the surveillance video matrix is ​​mainly to use the limited monitoring equipment to see more pictures, and to remotely control the relevant pan/tilt and lens, so as to clearly see the situation that needs to be monitored, and also use the keyboard with the random input to input the The image can be switched to any output at will, and the up, down, left and right of the pan/tilt, the distance of the lens, the length and the switch of the camera can be controlled. The current video matrix has two major categories of analog matrix and digital matrix in terms of its implementation method. The video matrix can be used in many occasions, such as the monitoring center of the security industry, the multimedia classrooms of the education industry, conference rooms, etc. Relatively speaking, the video matrix used by the monitoring industry (also called the monitoring matrix, video surveillance matrix, monitoring video matrix) many.

(3) Monitoring the characteristics of the video matrix

The monitoring video matrix host adopts a large-scale audio and video switching dedicated chip as a multi-channel multi-channel switching device for audio and video switching matrix circuits, and combines advanced matrix switching technology and computer technology to provide users with excellent overall performance. The host adopts a modular plug-in board, and the user can select a variety of plug-in boards to combine the capacity and function of the system.

A variety of functions such as audio switching, video switching, alarm input and post-alarm linkage recording in a standard 19-inch chassis greatly simplify the system configuration and improve the reliability of the support system. The monitoring matrix host has complete matrix switching capability. It can display the image of any camera and the sound corresponding to it on any monitor, and this control can be realized by manual operation and automatic switching. Users can use a full-featured, ergonomic system. The keyboard designed by the principle of operation operates and programs the system. Up to 16 keyboards or multimedia terminals can be used in the system. The monitoring matrix host combines various control protocols, which can directly control the popular decoders and high-speed balls in the market, and can be jointly controlled by digital hard disk recorders. Different configurations of the system.

(4) Monitoring matrix switcher

The monitor matrix switcher is specifically designed to switch and distribute computer monitor signals, and can switch multiple signals from the input channel to any of the output channels, and the output channels are independent of each other. Simply put, it is a mathematical concept to display any one of the incoming multiple input signals to any one of the monitors you specify. It is an abbreviation for a class of electronic products in the electronics industry. The name is called "matrix switcher." The word "matrix" in the matrix switcher refers to the concept of matrix in higher mathematical linear algebra. Specifically, in the electronic product of the matrix switcher, generally speaking, in the case of multiple input, there are multiple output selections to form a matrix structure.

In production and life, the wisdom of the working people is powerful, so it is referred to as a "matrix". In general, matrix switchers are a type of device that switches the input and output of multiple signals.

Generally speaking, the matrix switcher actually transmits one or more audio and video signals to one or more display devices respectively. For example, two computer mainframes share a single display, and the matrix switcher can be used on two computer mainframes. The content can be switched to the same or multiple displays at will, matrix switcher, according to the signal source can be divided into: VGA, AV, DVI matrix switcher and so on.

At present, the main applications of matrix switchers are large screen splicing, video conferencing engineering, audio and video engineering, monitoring, etc., which require the use of multiple audio and video signals alternately.

(5) Classification of surveillance video matrix

The selection of monitoring matrix types, broadcasting and video conferencing applications should use broadcast-grade products, monitoring applications can use monitoring products, video signals (some people also regard it as video) to use monitoring signal matrix, monitoring matrix size selection: in one In engineering, audio and video signals and VGA signals should be considered as three different media.

The video matrix is ​​divided into an analog matrix and a digital matrix in different ways of implementing video switching:

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 video matrix can be said to have been widely used in our daily monitoring system. By switching the signal to any display input to the set display terminal, it can zoom in, zoom out, zoom in and out, switch the lens, etc. Series operation. This can not only play a monitoring role, but also largely avoid the waste of one input terminal corresponding to one input signal. This is the convenient operation of the video matrix.

Divide the types of video matrices according to the number of interfaces:

According to the number of interfaces, the common ones are 8-way-16--24-32-48-64-80-96-112-128-144-160-176-192 -208 Road - 224 Road - 240 Road - 256 Road - 384 Road - 512 Road, etc.;

It can also be divided into analog matrix and digital matrix according to the type of signal processed, and of course there is a hybrid matrix. Analog matrix, video switching is done at the analog video layer. Signal switching is mainly realized by using a single-chip microcomputer or a more complex chip control analog switch; digital matrix, video switching is completed at the digital video layer, and the process can be 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, convert the digital signal into an analog signal output, and the core part of the video switching. The analog switch of the analog matrix will become the processing and transmission of digital video.