An audio-video mixing matrix dual backup control system

Abstract

The application discloses an audio and video mixing matrix double backup control system and particularly relates to the field of video processing control, which comprises a CAN bus and a plurality of input collection units and output signal units which are electrically connected with each other through the CAN bus. The CAN bus is further electrically connected with a digital signal exchange unit, a main control unit and a backup control unit. The backup control unit has the same control processor CPU and control interface as the main control unit. The double backup control system can flexibly configure the number and type of matrix input and output ports according to user requirements, does not waste the matrix ports, effectively saves the user cost, builds a multi-channel audio and video matrix system by using the characteristics of the CAN bus, flexibly increases or reduces the number of input and output units according to user requirements, builds a multi-channel backup control system by using the characteristics of the CAN bus, can realize real multi-backup control, the backup control immediately takes over the control of the whole system when the main control system fails, and the safety of the system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of video processing control, more particularly, the present application relates to a kind of audio-video mixing matrix double backup control system. BACKGROUND

[0002] At present, audio-video mixing matrix system is widely used in video conference, energy power, smart city, public security traffic, exhibition display, production scheduling, broadcast television, education research and other fields due to supporting arbitrary switching and distribution of various audio and video signals, various control modes, directly controlling other peripheral devices, using pure hardware architecture design, strong system stability, high integration, strong compatibility, signal without compression, lossless, no delay, can restore the best quality picture to display terminal and other advantages.

[0003] Most of the matrix systems on the market have only one set of control interface and one set of control unit, and a few have two sets of control interfaces, but the two sets of control interfaces are actually connected to one set of control unit. Once the control interface or control unit of the former fails, the entire matrix system will be unusable, and the system data will be at risk of loss. Although the latter has a backup control interface, if the internal control unit fails, the entire matrix system will also be unusable. This cannot meet the needs of real-time requirements in video conferencing, smart city, public security traffic, broadcast television and other fields or some major security projects. SUMMARY

[0004] In order to overcome the above-mentioned defects of the prior art, the present application provides an audio-video mixing matrix double backup control system, and the technical problems to be solved by the present application are that the current audio-video mixing matrix system is prone to system downtime and data loss when it fails, and cannot meet the safety requirements of some high requirements.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an audio-video mixing matrix double backup control system, comprising: a CAN bus and a plurality of input acquisition units and output signal units electrically connected to each other through the CAN bus.

[0006] The CAN bus is also electrically connected to a digital signal switching unit, a main control unit and a backup control unit.

[0007] The backup control unit has the same control processor CPU and control interface as the main control unit. When the main control unit operates, the backup control unit receives the control parameters of the main control unit in real time and saves them in the storage module of the unit.

[0008] As a further scheme of the present application: the input acquisition unit uniformly converts external video signal sources of multiple formats into HDMI digital signals, and selectively embeds audio signal sources into the audio channel of the HDMI signal, and transmits the converted HDMI audio and video signal to the digital signal switching unit.

[0009] As a further scheme of the present application: the output signal unit converts the HDMI signal of the digital signal switching unit into multiple video formats receivable by a display terminal.

[0010] As a further scheme of the present application: the multiple formats include analog VGA, CVBS and YPbPr, and also include digital DVI, SDI and HDMI format signals.

[0011] As a further scheme of the present application: the user operation instruction of the master control unit is parsed into control instructions by the host computer software, remote controller or panel buttons, and the control instructions are uniformly distributed on the CAN bus to complete the overall cooperative work of the CAN bus.

[0012] As a further scheme of the present application: the digital signal switching unit transmits the HDMI signals converted by the input acquisition unit to the output signal unit after realizing arbitrary channel signal switching.

[0013] As a further scheme of the present application: the master control unit saves real-time control parameters in the storage module of the unit, and transmits the parameters to the backup control unit through the CAN bus.

[0014] As a further scheme of the present application: the multiple video formats include analog VGA, CVBS, YPbPr and digital DVI, SDI and HDMI format signals, and the output signal unit displays and processes the HDMI signal to independently output the audio.

[0015] The present application has the following advantages:

[0016] The double backup control system can flexibly configure the number and type of matrix input and output ports according to user needs, so that a matrix port is not wasted, user costs are effectively saved, a multi-channel audio and video matrix system is built by using the characteristics of the CAN bus, the number of input and output units can be flexibly increased or decreased according to user needs, a multi-channel backup control system is built by using the characteristics of the CAN bus, and true multi-backup control can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 This is a schematic diagram of the system of the present invention;

[0018] Figure 2 This is a schematic diagram of the workflow of the present invention. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1:

[0021] A dual-backup audio-video hybrid matrix control system includes a CAN bus and several input acquisition units and output signal units electrically connected to each other via the CAN bus. The CAN bus is also electrically connected to a digital signal exchange unit, a main control unit, and a backup control unit. The backup control unit has the same control processor CPU and control interface as the main control unit. When the main control unit is operating, the backup control unit receives control parameters from the main control unit in real time and stores them in its own storage module. The input acquisition unit converts various external video signal sources into HDMI digital signals, and selectively embeds audio signal sources into the audio channel of the HDMI signal, transmitting the converted HDMI audio and video signals to the digital signal exchange unit. The output signal unit converts the HDMI signals from the digital signal exchange unit into various video formats that the display terminal can receive. These formats include analog VGA, CVBS, and YPbPr, as well as digital DVI, SDI, and HDMI signals. User operation commands from the main control unit are parsed into control commands via host computer software, remote control, or panel buttons and uniformly distributed on the CAN bus to complete the overall coordinated operation of the CAN bus. The digital signal switching unit converts HDMI signals from several input acquisition units into arbitrary channel signals and then transmits them to several output signal units. This channel switching correspondence is controlled by the user via host computer software, remote control, or panel buttons, sending switching commands to the control unit to control the digital signal switching unit to perform the corresponding channel switching operation. The main control unit stores real-time control parameters in its storage module and transmits these parameters to the backup control unit via the CAN bus. The various video formats include analog VGA, CVBS, YPbPr, and digital DVI, SDI, and HDMI signals. The output signal units display the signal while simultaneously processing the HDMI signal and de-embedding the audio for independent external playback.

[0022] In summary, combined with Figure 1As can be seen, this matrix system consists of several input acquisition units and several output signal units, one digital signal exchange unit, one main control unit, and one backup control unit. These are connected as single nodes to a single network composed of a CAN bus. Furthermore, this scheme specifically uses a pair of differential signals for CAN bus transmission, providing a data transmission rate of up to 1Mb / s during data communication. It features low cost, high speed, high resistance to electromagnetic interference, and superior error detection and correction capabilities.

[0023] In this invention, combined Figure 2 To explain further:

[0024] First, the system control unit receives the user's operation commands through host computer software, remote control, panel buttons, and other control methods.

[0025] The main control unit determines whether it is malfunctioning by correctly parsing the user's operation commands. If the main control unit is not malfunctioning, the control system will operate according to the following main control unit workflow steps:

[0026] a. The main control unit parses user commands and saves all control parameters in its own storage module. Generally, Flash chips are used to save parameters, which have a large storage space and will not be lost when power is off.

[0027] b. The main control unit transmits a copy of the control parameters to the backup control unit via the CAN bus. The backup control unit stores these control parameters in the Flash memory chip attached to the CPU of the backup control unit, ensuring that the control parameters in the main and backup control units are the same after each operation.

[0028] c. According to the working principle of the CAN bus, when the master control unit sends data to other units, the CPU of the master control unit transmits the data to be sent and its own identifier to the CAN chip of the master control unit and is in a ready state; when it receives a bus allocation, it switches to the message sending state. The CAN chip organizes the data into a message format according to the protocol and sends it out. At this time, other node units on the bus are in the receiving state. Each unit in the receiving state checks the received messages to determine whether these messages are addressed to it. For example, if the master control unit parses a user's control command and sends it to the bus network, the M input acquisition units, digital signal exchange units, and N output signal units on the bus will all receive this message and each will check the received message.

[0029] d. The input acquisition unit detects whether the message is sent to itself. If yes, the CPU of the input acquisition unit executes the message instruction, controlling the image processing module in the input unit to display the signal source type label or embed external audio, etc. If no, no operation is performed.

[0030] e. Simultaneously, the digital signal switching unit detects whether the message is sent to itself. If yes, the switching unit CPU executes the message instruction to control the high-speed signal switching chip to switch the HDMI channel correspondence. If no, no operation is performed.

[0031] F. Simultaneously, the output signal unit detects whether the message was sent to itself. If yes, the output unit CPU executes the message instruction, controlling the image processing module in the output unit to change parameters such as the output signal resolution. If no, no operation is performed.

[0032] Furthermore, since the CAN bus is a content-oriented addressing scheme, it can transmit and receive data in point-to-point, point-to-many, and global broadcast modes simply by filtering messages. We can easily add new node units to the CAN bus without modifying the hardware or software, providing a basis for the diversity of input acquisition and output signal units in matrix systems. This ensures no matrix ports are wasted, saving costs for users.

[0033] Because nodes on the CAN bus network are not distinguished by master and slave, any node can actively send information to other nodes on the network at any time. Based on these characteristics of the CAN bus, the backup control module can both receive control parameters sent by the master control module and switch to the active control unit at any time to control the entire audio-visual matrix system. This achieves the purpose of multiple backup control.

[0034] If the main control unit fails, the backup control unit will take over the main control unit's workflow, parsing user commands, saving control parameters, and sending control messages to the CAN bus network. Each unit will operate according to the steps outlined above to ensure the normal operation of the matrix system.

[0035] Finally, it should be noted that although the present invention has been described in detail above with general descriptions and specific embodiments, the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-backup audio-video hybrid matrix control system, characterized in that, include: The CAN bus and several input acquisition units and output signal units that are electrically connected to each other via the CAN bus; The CAN bus is also electrically connected to a digital signal exchange unit, a main control unit, and a backup control unit; The main control unit stores the real-time control parameters in its own storage module and transmits the parameters to the backup control unit via the CAN bus. The backup control unit has the same control processor CPU and control interface as the main control unit. When the main control unit is operating, the backup control unit receives the control parameters of the main control unit in real time and saves them in its own storage module. The input acquisition unit converts various external video signal sources into HDMI digital signals in a unified manner, and selectively embeds audio signal sources into the audio channel of the HDMI signal, and transmits the converted HDMI audio and video signals to the digital signal switching unit. When the main control unit is functioning correctly, the control system operates according to the following main control unit workflow steps: a. The main control unit parses user commands and saves all control parameters in the unit's storage module; b. The main control unit transmits a copy of the control parameters to the backup control unit via the CAN bus. The backup control unit stores these control parameters in the Flash memory chip attached to its CPU, ensuring that the control parameters in the main control unit and the backup control unit are identical after each operation. c. According to the working principle of the CAN bus, when the main control unit sends data to other units, the CPU of the main control unit transmits the data to be sent and its own identifier to the CAN chip of the main control unit and is in a ready state; when it receives the bus allocation, it switches to the message sending state. The CAN chip organizes the data into a message format according to the protocol and sends it out. At this time, other node units on the bus are in the receiving state. Each unit in the receiving state detects the received message and determines whether the message is addressed to it. The main control unit parses a user control command and sends it to the bus network. The M input acquisition units, digital signal exchange units and N output signal units on the bus will receive this message and detect it. d. The input acquisition unit detects whether the message is sent to itself. If yes, the CPU of the input acquisition unit executes the message instruction and controls the image processing module in the input acquisition unit to display the signal source type label or embed external audio; otherwise, no operation is performed. e. At the same time, the digital signal switching unit detects whether the message is sent to itself. If yes, the CPU of the digital signal switching unit executes the message instruction and controls the high-speed signal switching chip to switch the HDMI channel correspondence; otherwise, no operation is performed. f. Simultaneously, the output signal unit detects whether the message is sent to itself. If yes, the CPU of the output signal unit executes the message instruction and controls the image processing module in the output signal unit to change the output signal resolution parameter; otherwise, no operation is performed. If the main control unit fails, the backup control unit will take over the main control unit's workflow, parse user commands, save control parameters, and send control messages to the CAN bus network.

2. The audio / video hybrid matrix dual backup control system according to claim 1, characterized in that: The output signal unit converts the HDMI signal from the digital signal exchange unit into various video formats that the display terminal can receive.

3. The audio / video hybrid matrix dual backup control system according to claim 1, characterized in that: The various formats include analog VGA, CVBS, and YPbPr, as well as digital DVI, SDI, and HDMI signal formats.

4. The audio / video hybrid matrix dual backup control system according to claim 1, characterized in that: The user operation commands of the main control unit are parsed into control commands through the host computer software, remote control or panel buttons and uniformly distributed on the CAN bus to complete the overall collaborative work of the CAN bus.

5. The audio / video hybrid matrix dual backup control system according to claim 3, characterized in that: The digital signal switching unit converts the HDMI signals from several input acquisition units into arbitrary channel signals and then transmits them to several output signal units. This channel switching correspondence is controlled by the user through the host computer software, remote control or panel buttons to send switching commands to the control unit, thereby controlling the digital signal switching unit to perform the corresponding channel switching operation.

6. The audio / video hybrid matrix dual backup control system according to claim 2, characterized in that: The various video formats include analog VGA, CVBS, YPbPr and digital DVI, SDI and HDMI signals. The output signal unit displays the signal and processes the HDMI signal, and de-embeds the audio for independent external playback.

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