Basic use of video matrix
The video matrix refers to an electronic device that outputs m video signals arbitrarily to an n-channel monitoring device through an array switching method. In general, an input of a matrix is ​​greater than an output, ie, m>n. Some video matrices also have audio switching capabilities that enable the simultaneous switching of video and audio signals. This matrix is ​​also called video and audio matrix. The current video matrix has two major categories: analog matrix and digital matrix. Video matrix is ​​generally used for various monitoring occasions.
The keyboard controller is a product that is matched with a terminal receiver such as a variable speed smart dome, a decoder, and a matrix. The EIA/RS-485 electrical interface is used between the control keyboard and the receiver. Without the bus driver, a keyboard can control up to 32 billiard machines or decoders. The maximum communication distance between the keyboard and receiver is 1.2Km. The control keyboard can be conveniently used to control and set the variable-speed dome camera. The control keyboard can also directly control the terminal decoder to control the front-end equipment such as constant-speed pan/tilt, lens, light, and wiper of the camera. Fast switching.
Three-dimensional vector variable speed joystick, controllable speed and variable speed PTZ and integrated fast ball, with 64 preset, 64 PTZ speed, 8 lens speed. Three-dimensional joysticks can be used for variable-speed control of ordinary and variable-speed lenses. Up to 168 PG1640 series decoders can be equipped to control 168 heads. The two-dimensional keyboard has relatively few functions.
one. The basic functions and requirements of the video matrix
As a video matrix, one of the most important functions is to achieve switching output of input video images. Accurately generalize it: Switch the video image from any input channel to any output channel display. In general, an M×N matrix means that it can support both M channels of image input and N channels of image output. What needs to be emphasized here is that it must be done arbitrarily, that is, an arbitrary input and an arbitrary output.
In addition, a matrix system should also generally include the following basic functions: character signal superposition; decoder interface to control pan and tilt and camera; alarm interface; control host, and audio control box, alarm interface box, control keyboard and other accessories. For domestic users, character superposition should be all Chinese, to facilitate the use of operators who do not understand English, the matrix system also needs to support cascading to achieve higher capacity, in order to adapt to different users of the matrix system capacity requirements, matrix The system should support modular and plug and play (PnP), which can be achieved by adding or subtracting video input and output cards.
The development direction of the matrix system is multi-functional, high-capacity, networked, and remote switching. In general, the capacity of the matrix system reaches 64×16 which is a large capacity matrix. If a larger capacity matrix system is needed, it can also be achieved by cascading multiple matrix systems. The greater the capacity of the matrix, the higher the required technical level, and the greater the difficulty of the design.
two. Classification of video matrix
According to the different ways to achieve video switching, video matrix is ​​divided into analog matrix and digital matrix.
1. Analog Matrix:
Video switching is done at the analog video layer. Signal switching is mainly implemented using a single-chip microcomputer or a more complex chip-controlled analog switch.
2. Digital Matrix:
Video switching is done at the digital video layer. This 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, change the analog signal to a digital signal, increase DA conversion at the video output, and convert the digital signal to analog signal output. The core part of the video switching is analog switch of the analog matrix, which will become the processing and transmission of digital video.
The keyboard controller is a product that is matched with a terminal receiver such as a variable speed smart dome, a decoder, and a matrix. The EIA/RS-485 electrical interface is used between the control keyboard and the receiver. Without the bus driver, a keyboard can control up to 32 billiard machines or decoders. The maximum communication distance between the keyboard and receiver is 1.2Km. The control keyboard can be conveniently used to control and set the variable-speed dome camera. The control keyboard can also directly control the terminal decoder to control the front-end equipment such as constant-speed pan/tilt, lens, light, and wiper of the camera. Fast switching.
Three-dimensional vector variable speed joystick, controllable speed and variable speed PTZ and integrated fast ball, with 64 preset, 64 PTZ speed, 8 lens speed. Three-dimensional joysticks can be used for variable-speed control of ordinary and variable-speed lenses. Up to 168 PG1640 series decoders can be equipped to control 168 heads. The two-dimensional keyboard has relatively few functions.
one. The basic functions and requirements of the video matrix
As a video matrix, one of the most important functions is to achieve switching output of input video images. Accurately generalize it: Switch the video image from any input channel to any output channel display. In general, an M×N matrix means that it can support both M channels of image input and N channels of image output. What needs to be emphasized here is that it must be done arbitrarily, that is, an arbitrary input and an arbitrary output.
In addition, a matrix system should also generally include the following basic functions: character signal superposition; decoder interface to control pan and tilt and camera; alarm interface; control host, and audio control box, alarm interface box, control keyboard and other accessories. For domestic users, character superposition should be all Chinese, to facilitate the use of operators who do not understand English, the matrix system also needs to support cascading to achieve higher capacity, in order to adapt to different users of the matrix system capacity requirements, matrix The system should support modular and plug and play (PnP), which can be achieved by adding or subtracting video input and output cards.
The development direction of the matrix system is multi-functional, high-capacity, networked, and remote switching. In general, the capacity of the matrix system reaches 64×16 which is a large capacity matrix. If a larger capacity matrix system is needed, it can also be achieved by cascading multiple matrix systems. The greater the capacity of the matrix, the higher the required technical level, and the greater the difficulty of the design.
two. Classification of video matrix
According to the different ways to achieve video switching, video matrix is ​​divided into analog matrix and digital matrix.
1. Analog Matrix:
Video switching is done at the analog video layer. Signal switching is mainly implemented using a single-chip microcomputer or a more complex chip-controlled analog switch.
2. Digital Matrix:
Video switching is done at the digital video layer. This 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, change the analog signal to a digital signal, increase DA conversion at the video output, and convert the digital signal to analog signal output. The core part of the video switching is analog switch of the analog matrix, which will become the processing and transmission of digital video.
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