Multi-channel DVI video distribution device based on ARINC429 signal selection

Abstract

The invention belongs to the technical field of aviation testing, and particularly relates to multichannel DVI video distribution equipment based on ARINC429 signal selection, which is used for selecting, distributing and outputting multichannel DVI video signals. The equipment comprises an ARINC429 control module, a DVI selection distribution unit, a balance adjustment module and a power supply conversion module. The ARINC429 control module receives and analyzes an ARINC429 signal, the DVI selection and distribution unit selects and outputs a DVI video signal according to the analyzed signal, and the equalization adjustment module carries out equalization processing on the DVI signal so as to improve the transmission quality. The device supports long-distance transmission, has an anti-interference capability, and is suitable for DVI video signal distribution in a complex aviation environment. Compared with the prior art, the invention provides higher signal stability and transmission quality.

Description

Technical Field

[0001] The invention relates to the field of aviation test technology, in particular to a multi-channel DVI video distribution device based on ARINC429 signal selection, which is suitable for the scenario of long-distance transmission and selective distribution of multi-channel DVI video signals. Background Art

[0002] DVI video signals are a digital video format widely used in modern aircraft flight test processes. They usually need to meet the needs of both onboard display screens and onboard acquisition devices during flight test missions. This leads to the need to add DVI video signal distribution equipment to the test link to achieve the function of distributing one signal into two. However, existing DVI video distribution equipment on the market usually only supports single-channel input and dual-channel output, and cannot meet the complex needs of selecting and distributing multiple video signals in a flight test environment.

[0003] In addition, DVI signals are susceptible to external interference during long-distance transmission, especially in complex aviation environments, where signal attenuation and noise are particularly prominent. Therefore, there is an urgent need for a device that can reliably select and distribute DVI video signals during long-distance transmission and has good anti-interference capabilities to ensure the stability and quality of signal transmission.

[0004] Although some DVI signal distributors exist in the prior art, their functions and performance cannot fully meet the requirements of multi-channel signal switching, long-distance transmission and anti-interference, especially in aviation environments. Therefore, how to achieve reliable selection and distribution of multi-channel DVI video signals based on ARINC429 signals and ensure the quality of signals in long-distance transmission is a technical problem that needs to be solved in this field. Summary of the invention

[0005] The present invention provides a multi-channel DVI video distribution device based on ARINC429 signal selection to solve the problem of how to reliably select and distribute multi-channel DVI video signals over a long distance based on ARINC429 signals while ensuring the anti-interference ability and transmission quality of the signals in a complex aviation environment.

[0006] In order to solve the above problems, the present invention provides a multi-channel DVI video distribution device based on ARINC429 signal selection, comprising: ARINC429 control module, used to receive ARINC429 signals, analyze control signals and transmit them to back-end circuits via I2C signals; A DVI selection and distribution unit is used to receive multiple DVI video signals and select a specified DVI signal for distribution and output according to the I2C signal sent by the ARINC429 control module; A balance adjustment module is used to balance the signal strength of the distributed DVI signal; The power conversion module is used to convert the external input power into the operating voltage required by each module of the system.

[0007] Furthermore, the ARINC429 control module includes an ARINC429 signal conversion module and a control signal analysis module, and the analyzed signal is transmitted to the DVI selection distribution unit through the I2C bus.

[0008] Furthermore, the DVI selection and distribution unit adopts a multiplexer to support signal distribution of one DVI signal divided into two outputs and two-to-one switching.

[0009] Furthermore, the equalization adjustment module performs adjustment according to the equalization setting parameters in the register, and selects a gain value to control the output of the DVI signal.

[0010] Furthermore, the equalization adjustment module includes a plurality of equalization units, each unit processes one DVI signal path, and the control signal is configured via an I2C bus.

[0011] Furthermore, the power conversion module adopts a two-stage power conversion method to convert the external DC28V power supply into the DC5V, 3.3V and 2.5V voltages required by the system.

[0012] Furthermore, the power conversion module includes overvoltage protection and overcurrent protection functions.

[0013] Furthermore, the DVI selection and distribution unit supports 14-channel DVI signal input and can selectively output 6-channel DVI signals.

[0014] Furthermore, the DVI selection allocation unit uses a cascaded manner to implement switching of multi-channel signal input and output.

[0015] Furthermore, the ARINC429 signal control module is connected to the MCU microcontroller via the SPI bus, and the MCU microcontroller controls the switching of the DVI signal distribution via the I2C bus.

[0016] The key innovative features of the present invention include: (1) Application of ARINC429 signal control module: ARINC429 signal is applied to DVI video signal selection and distribution to ensure control accuracy and stability in complex aviation environment.

[0017] (2) DVI equalization adjustment technology: The innovative use of dynamic equalization adjustment method solves the attenuation and distortion problems in long-distance DVI signal transmission, improving video transmission quality and anti-interference capabilities.

[0018] The following are its main beneficial effects: (1) Enhanced reliability of long-distance signal transmission: Through the DVI equalization adjustment unit, the signal gain and attenuation during the transmission process are dynamically adjusted, which significantly improves the quality of DVI signals in long-distance transmission and reduces signal distortion and interference.

[0019] (2) Flexible selection and allocation of multi-channel signals: The use of ARINC429 signals for precise control enables the system to quickly and flexibly select and allocate multi-channel DVI video signals, improving the flexibility and efficiency of test tasks.

[0020] (3) Modular design facilitates expansion: The system supports 14-channel DVI input and 6-channel optional output, and is highly scalable, meeting the needs of multi-channel video signal transmission on large aircraft.

[0021] (4) Efficient power management: Through the power conversion module, multi-channel power conversion is realized to ensure that the equipment can still stably provide the required voltage when running at high load, thereby enhancing the mission reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the operation flow of a multi-channel DVI video distribution device based on ARINC429 signal selection provided by an embodiment of the present invention; Figure 2 It is a block diagram of the operation structure module of a multi-channel DVI video distribution device based on ARINC429 signal selection provided by an embodiment of the present invention; Figure 3 The present invention provides a functional block diagram of a multi-channel DVI video distribution device based on ARINC429 signal selection; Figure 4 The present invention provides a DVI distribution module principle block diagram of a multi-channel DVI video distribution device based on ARINC429 signal selection; Figure 5 The present invention provides a principle block diagram of a power module of a multi-channel DVI video distribution device based on ARINC429 signal selection. DETAILED DESCRIPTION

[0023] The present invention belongs to the field of aviation test technology, and specifically relates to a multi-channel DVI video distribution device based on ARINC429 signal selection, which is used for selecting and distributing multiple DVI video signals for output. The device includes an ARINC429 control module, a DVI selection and distribution unit, a balance adjustment module and a power conversion module. The ARINC429 control module receives and parses the ARINC429 signal, the DVI selection and distribution unit selects and outputs the DVI video signal according to the parsed signal, and the balance adjustment module performs balance processing on the DVI signal to improve the transmission quality. The device supports long-distance transmission and has anti-interference ability, and is suitable for DVI video signal distribution in complex aviation environments. Compared with the prior art, the present invention provides higher signal stability and transmission quality.

[0024] A multi-channel DVI video distribution device based on ARINC429 signal selection provided in an embodiment of the present invention is mainly used to solve the technical problem solved by the present invention, which is "how to reliably select and distribute multi-channel DVI video signals over long distances based on ARINC429 signals, while ensuring the signal's anti-interference ability and transmission quality in a complex aviation environment."

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit and scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0027] Embodiment 1: Reference Figure 1 , is a schematic diagram of a process of a multi-channel DVI video distribution device based on ARINC429 signal selection provided by an embodiment of the present invention. The multi-channel DVI video distribution device process based on ARINC429 signal selection may at least include steps S100-S400: S100, ARINC429 control module, is used to receive ARINC429 signals, analyze control signals and transmit them to back-end circuits via I2C signals.

[0028] S200, a DVI selection and distribution unit is used to receive multiple DVI video signals and select a specified DVI signal for distribution and output according to the I2C signal sent by the ARINC429 control module.

[0029] S300, a balance adjustment module, used for performing a signal strength balance process on the distributed DVI signal.

[0030] S400, a power conversion module, is used to convert external input power into the operating voltage required by each module of the system.

[0031] Step S100 includes steps S110-S130: S110, receiving a command signal from the control system through the ARINC429 signal control module, transmitting the signal to a microcontroller unit (MCU) through an SPI interface, and the MCU reading and parsing the ARINC429 control signal.

[0032] Specifically, when the system starts, the ARINC429 signal selection control module will start to receive the ARINC429 signal transmitted by the airborne system. The signal is a data signal collected by external devices and airborne sensors, mainly including AR_signal(t), where t represents the time variable of signal transmission. The signal enters the MCU microcontroller module through the ARINC429 interface.

[0033] In the steps, the input AR_signal(t) signal is generated by different airborne systems and test equipment, such as test flight instruments and display systems. The ARINC429 interface module transmits the control information in the form of 32-bit words through a standard serial communication protocol. The signal is mainly transmitted through a standard frame in the bus protocol, and the frame includes a synchronization bit (SYN), a data field (DATA) and a parity check (P) to ensure data integrity.

[0034] S120: Based on the analyzed signal, the MCU analyzes the quality of the DVI video signal during transmission and feeds the data back to the video signal processing module. Specifically: Furthermore, the MCU microcontroller module reads and parses the received signal from the ARINC429 signal selection module through the SPI bus. The specific parsing steps include reading the 32-bit ARINC429 signal frame and parsing the signal according to the following formula: AR_frame=SYN+DATA+P Among them, SYN represents the synchronization part of the frame, which is used to identify the beginning of the signal; DATA represents the main data field of the frame, which contains the transmitted instructions and control signals; P represents the parity bit, which is used for data verification.

[0035] The MCU reads the frame data and interprets the information in the DATA field into different control instructions. For example, if the value in the DATA field is CMD_1, the MCU will recognize the command for video signal switching.

[0036] The parsed signal can be expressed as AR_cmd and stored in the register inside the MCU. The parsing logic of AR_cmd is: AR_cmd=F(AR_frame) Among them, F is a parsing function that converts the received frame into a specific control signal instruction. The AR_cmd signal value indicates different operations, such as signal switching (Switch), equalization adjustment (Equalize), and signal amplification (Amplify).

[0037] S130, through the I2C interface, the MCU transmits the analysis results to the video equalization module and provides parameters for equalization adjustment. Specifically: The MCU microcontroller passes the parsed AR_cmd signal to the next level module, the video signal processing module, through the I2C bus. Specifically, the AR_cmd value determines the selection and switching of the DVI signal. For example, assuming that the value of AR_cmd is Switch_1, indicating that the video signal of DPU1 is selected for transmission, the MCU generates a corresponding I2C command to control the multiplexer in the video signal processing module to perform the switching operation.

[0038] The signal forwarding operation in the step can be expressed as: I2C_cmd=G(AR_cmd) Among them, G is the I2C signal generation function, which converts the control instructions parsed by the MCU into the I2C signal format, and I2C_cmd is used to control the specific switching behavior in the video signal processing module.

[0039] After the control signal is transmitted to the video signal processing module through the I2C bus, the module will perform video signal selection and allocation operations according to the transmitted instructions, such as performing one-or-the-other processing of DPU1 and DPU2 signals, and other equalization and adjustment operations.

[0040] Step connection and subsequent use: The parsed signal instruction AR_cmd and the generated control signal I2C_cmd directly affect the work of the subsequent video signal processing module. The instructions will be used to guide the subsequent video signal processing module to perform switching, equalization and distribution operations, and ensure the normal transmission and quality adjustment of the DVI signal. For example, when the video signal processing module receives the Switch_1 instruction of I2C_cmd, it will perform a two-choice switching operation of the DVI signal according to the information transmitted by the I2C bus, and output the video signal of DPU1 to the video display and acquisition device. The video equalization module will adjust the gain of the video signal through the I2C interface according to the equalization adjustment instruction Equalize_x in I2C_cmd to compensate for the attenuation during signal transmission. The I2C_cmd signal generated by step S130 plays a key bridge role in the entire system, effectively connecting the parsing results of the ARINC429 signal with the actual video signal processing operation.

[0041] Step S200 at least includes steps S210-S230: S210, receiving multiple DVI video signals from DPU1 and DPU2 through the video distribution module, and monitoring the input status of the signals. Specifically: Specifically, after the I2C_cmd signal generated in step S130 is transmitted to the video signal processing module, the video signal processing module starts to work. The module receives the DVI video signals of DPU1 and DPU2 through the DVI interface protection module. The input DVI signals are represented as DVI_in1 and DVI_in2, where DVI_in1 represents the input signal from DPU1, and DVI_in2 represents the input signal from DPU2. When the signal enters the system, it is first protected by the ESD protection module to ensure that the input signal is protected from interference such as static electricity and surge current.

[0042] The process of ESD protection can be expressed as: DVI_{protected}=ESD(DVI_{in1},DVI_{in2}) Among them, DVI_{protected} represents the DVI input signal after ESD protection, and ESD() is a function representing the protection mechanism to ensure that the input signal is not affected by external interference.

[0043] Through the interface protection module, the DVI signal can be completely transmitted to the system for use by the subsequent processing module. The module further ensures the signal quality and lays the foundation for subsequent signal allocation and selection operations.

[0044] S220: The multiplexer in the video distribution module switches and selects the DVI signal source through the control signal transmitted by the MCU, and adjusts the signal distribution path according to the state of the input signal. Specifically: Furthermore, after receiving the DVI_{protected} signal, the system processes each DVI signal in two by using a four-way 1:2 multiplexer. At this time, the DPU1 signal DVI_in1 is divided into two independent signals, represented as DVI_out1a and DVI_out1b, and the DPU2 signal DVI_in2 is also divided into DVI_out2a and DVI_out2b. The distribution process can be expressed by the following formula: DVI_{out1a},DVI_{out1b}=Split(DVI_{in1}) DVI_{out2a},DVI_{out2b}=Split(DVI_{in2}) The Split() function represents the signal distribution operation. DVI_out1a and DVI_out2a are respectively transmitted to the video equalization module, and DVI_out1b and DVI_out2b are directly transmitted to the output interface module. Through the one-to-two processing, the signal can be effectively distributed to support parallel processing of multiple downstream modules and improve the processing efficiency of the system.

[0045] During this process, DVI_out1a and DVI_out2a will be further sent to the video equalization module for signal enhancement and attenuation compensation, while DVI_out1b and DVI_out2b will be used to directly output to the device to ensure complete signal transmission.

[0046] S230: The video distribution module distributes the processed signal to the equalization module and ensures that the distributed signal status is correctly recorded for subsequent adjustment and output. After receiving the control instruction I2C_cmd from the MCU, the multiplexer of the video signal processing module processes the DVI signal according to the control signal. Specifically, when the instruction transmitted by I2C_cmd is a signal to select DPU1, the system will select one signal from DVI_out1a and DVI_out1b for output; when I2C_cmd selects DPU2, the system will select one signal from DVI_out2a and DVI_out2b for output.

[0047] The selection process can be expressed by the following formula: DVI_{selected}=Select(I2C_{cmd},DVI_{out1a},DVI_{out2a},DVI_{out1b},DVI_{out2b}) The Select() function performs the signal selection operation according to the instruction in I2C_cmd. DVI_{selected} indicates the final selected output signal, which is used for downstream display devices and acquisition devices.

[0048] Connection between previous and next steps: The signal switching step of the I2C_cmd signal generated by S130 is transmitted to S230 to ensure that the entire system operates according to the predetermined logic and control instructions. According to the instructions parsed in I2C_cmd, the multiplexer in S230 switches and distributes the DVI signal, thereby realizing the dynamic switching of the DPU1 and DPU2 signals to meet the different needs during the flight test.

[0049] Step S300 at least includes S310-S330: S310, the video equalization module receives the equalization adjustment parameters from the MCU based on the I2C interface. Specifically: The video equalization module receives the DVI signal through the video signal processing module. Specifically, the module receives the DVI signal allocated by step S220, including DVI_out1a and DVI_out2a, that is, the signal after being split into two from DPU1 and DPU2. Through the I2C bus of the equalization module, the system obtains the equalization adjustment parameter from the MCU microcontroller module, specifically the gain value G_eq.

[0050] The gain value G_eq is used to adjust the signal strength to meet the signal transmission requirements of different distances. The equalization adjustment process can be expressed as: DVI_{eq}=EQ(DVI_{in},G_{eq}) Wherein, DVI_{eq} is the DVI signal after equalization adjustment, EQ() is the operation function of equalization adjustment, DVI_{in} represents the received DVI signal, and G_{eq} represents the equalization gain value transmitted through I2C.

[0051] Through this adjustment step, the system can adjust the equalization gain according to the real-time received signal transmission quality to ensure that the signal maintains stable quality after long-distance transmission. This step is closely dependent on the equalization adjustment parameters previously transmitted from the MCU and is dynamically adjusted according to the actual transmission distance and environmental conditions.

[0052] S320: According to different transmission distances and signal attenuation conditions, the video equalization module adjusts the amplitude and phase of the DVI signal and stores the adjusted signal in the module memory. Specifically: Next, the video equalization module compensates for the signal attenuation by adjusting the signal amplitude and gain according to the attenuation during signal transmission. Specifically, the system detects the signal after long-distance transmission, determines the signal attenuation A_{loss}, and adjusts the amplitude and gain through the registers in the equalization adjustment module to compensate for the attenuation loss during transmission.

[0053] The calculation formula for attenuation compensation is: DVI_{comp}=DVI_{eq}\times(1+A_{comp}) Among them, DVI_{comp} is the compensated DVI signal, A_{comp} is the compensation factor calculated by the system, which is dynamically adjusted according to the signal transmission distance and environmental parameters, and DVI_{eq} is the signal after equalization adjustment.

[0054] At this time, the system calculates the attenuation compensation value A_{comp} based on the transmission distance (such as the length of the transmission cable, the transmission medium, etc.) to ensure that the signal can maintain stable quality when it is transmitted to the subsequent modules.

[0055] S330, the equalization module feeds back the equalization adjustment status to the MCU through the internal register, and prepares for the next signal output. Specifically: After equalization adjustment and attenuation compensation, the DVI signal is output to the DVI output interface module through the output port of the video equalization module. In this step, the compensated signal DVI_{comp} is transmitted to the downstream output device to ensure high-quality signals during display and acquisition.

[0056] The output formula is: DVI_{out}=DVI_{comp} Among them, DVI_{out} represents the final output DVI signal, which will be transmitted to the display device and acquisition device in the subsequent DVI interface. The signal after equalization processing not only improves the transmission stability, but also can adapt to the needs of video signals with different resolutions, such as 1920x1080@60Hz.

[0057] Connection between previous and next steps: The equalization gain value G_eq obtained through the I2C bus in step S310 is determined by the MCU control signal transmission in step S130, and the equalization adjustment parameter is closely related to the signal transmission conditions. The attenuation compensation parameter A_{comp} in step S320 is calculated by analyzing the transmission distance and real-time environmental monitoring to ensure that the signal quality will not drop significantly under long-distance transmission conditions. Step S330 outputs a high-quality video signal to the subsequent processing module through the adjustment and compensation of the first two steps, and finally completes the transmission and display of the signal.

[0058] Step S400 at least includes S410-S430: S410, MCU transmits the balanced DVI signal to the output module through the I2C interface, and the output module controls the output of the video signal according to the current demand. Specifically: In the implementation process of the present invention, the dynamic power management module receives the DC28V power input voltage from the airborne system. This input voltage is processed by a two-stage voltage conversion module. First, the DC28V voltage is converted to a DC5V output by the first-stage voltage conversion module. After the DC5V voltage is output, the system further converts it to 3.3V and 2.5V voltages through the second-stage voltage conversion module to provide power supply for each submodule with different requirements.

[0059] Specifically, the system is based on the power requirements of each module. For example, the MCU microcontroller module requires a 3.3V voltage, while the DVI distribution module and the ARINC429 signal selection control module require a 2.5V voltage. Through this level and the second level of voltage conversion, it can provide a stable power distribution for the entire system to ensure the normal operation of the system. The formula is: V_{out1}=f(V_{in},G_{p1}) V_{out2}=f(V_{out1},G_{p2}) Among them, V_{in} is the DC28V input voltage, G_{p1} and G_{p2} are the gain factors of the primary and secondary voltage conversion modules respectively, V_{out1} is the DC5V output voltage, and V_{out2} is the final 3.3V and 2.5V voltage output.

[0060] S420, the dynamic adjustment module monitors the status of each signal output port in real time and adjusts the power and frequency of the output signal. Specifically: The system is equipped with overvoltage and overcurrent protection mechanisms. Specifically, the power protection module monitors the input DC28V voltage signal in real time. When the input voltage exceeds the specified range (for example, higher than the specified maximum voltage, lower than the minimum voltage threshold), the system will immediately trigger the protection mechanism to prevent the voltage from being too high or too low, causing damage to the device.

[0061] At the same time, the power protection module also monitors the current. If it detects that the current exceeds the rated value, the system will automatically cut off the power supply through the fuse and protection circuit to prevent the module from being damaged by excessive current. The protection trigger conditions of voltage and current can be expressed by the following formula: Among them, P_{voltage} represents the voltage protection state, V_{max} and V_{min} are the set voltage thresholds; P_{current} represents the current protection state, and I_{max} is the maximum current value.

[0062] When the protection module detects that P_{voltage} and P_{current} are triggered, the power supply will be interrupted and the fault information will be fed back to the MCU microcontroller module for further processing.

[0063] S430: The output module transmits the signal to the final display acquisition end, and the system adjusts the output state in real time through a dynamic feedback mechanism. Specifically: During system operation, the dynamic power management module will also monitor and dynamically adjust energy consumption according to actual load requirements. Specifically, the power management module monitors the power consumption of each module in real time and dynamically adjusts the power distribution based on the load data provided by the MCU microcontroller module. Through this mechanism, the system can reduce power consumption as much as possible and improve system energy efficiency while meeting normal working requirements.

[0064] The formula for energy consumption monitoring can be expressed as: P_{total}=sum_{i=1}^{n}P_i Where P_{total} is the total power consumption of the system, and P_i is the power consumption of each module. The system will adjust the power supply according to the real-time load of each module. When the load of a module decreases, the system will reduce the power supply of the module to save energy.

[0065] In addition, real-time monitoring of energy consumption data will also be fed back to the MCU microcontroller module to ensure that the power consumption of the entire system is always at an optimal level. At the same time, this dynamic adjustment process also helps to extend the service life of the equipment and improve mission reliability.

[0066] Notes on the connection between steps: During the S410 intelligent power supply process, the system completes two-level voltage conversion to provide the required voltage for each module. In step S420, by real-time monitoring of input voltage and current, the system ensures that any overvoltage and overcurrent conditions can be handled in a timely manner during the power supply process to avoid damage to the equipment. S430 further optimizes power distribution and power consumption management through real-time energy consumption monitoring, making the system's power distribution more intelligent and efficient during the entire operation process.

[0067] Embodiment 2: The present invention provides a multi-channel DVI video distribution device based on ARINC429 signal selection, comprising a DVI interface protection module, a DVI distribution module, a video equalization module, an ARINC429 signal selection control module, an MCU microcontroller module, a power conversion module and an indicator light. Figure 3 shown.

[0068] The above-mentioned DVI interface protection module adopts the high-speed data line ESD protection device RCLAMP0524P, which is connected to the input / output connector interface of the device. It is a low-capacitance TVS diode array that protects high-speed data and lines from transient overvoltage and overcurrent damage caused by electrostatic discharge, cable discharge, and electrical fast transients.

[0069] The above-mentioned DVI distribution module adopts a four-way 1:2-2:1 multiplexer to receive the DVI multi-channel video signals of DPU1 and DPU2 input through the DVI interface protection circuit for one-to-two and two-to-one distribution processing. After the DPU1 signal is divided into two, one of the signals is input into the video equalization module and connected to the two-to-one multiplexer after equalization adjustment, and the other is connected to the DVI interface protection circuit output; after the DPU2 signal is divided into two, one of the signals is connected to the DVI interface protection circuit output to the aviation plug, and the other is directly connected to the two-to-one multiplexer.

[0070] The above four-channel 1:2-2:1 multiplexer uses the SN65LVCP114 chip with three ports that supports multi-rate operation up to 14.2Gbps serial data rate. The DVI signal is input through the CIN port, adjusted by the linear receiving equalizer, connected to the 1:2 multiplexer for one-to-two processing, and then output from AOUT and BOUT respectively through the linear driver; the DVI signals switched by DPU1 and DPU2 are input from the BIN and AIN ports respectively, adjusted by the linear receiving equalizer, connected to the 2:1 multiplexer for two-to-one processing, and then output from COUT through the linear driver. Each port of the linear receiving equalizer and the linear driver can independently program the corresponding configuration registers through the I2C configuration interface, such as Figure 4 shown.

[0071] The above-mentioned video equalization module adopts the video equalizer DS16EV5110A with 8 equalization levels for DVI source / repeater / sink applications. According to the on-board signal transmission conditions, the appropriate equalization level can be selected through the I2C configuration interface to configure the corresponding registers to provide the best signal enhancement and reduce inter-symbol interference, thereby improving the signal transmission quality.

[0072] The MCU microcontroller module is connected to the ARINC429 signal selection control module through the SPI bus interface to obtain the input ARINC429 control switching signal state, and is connected to the DVI distribution module two-to-one multiplexer through the I2C bus to perform switching configuration of multi-channel DVI video signals. The MCU microcontroller module is also connected to the DVI distribution module and the video equalization module through the I2C bus interface to perform signal one-to-two distribution, amplitude, gain, and equalization adjustment configuration.

[0073] The above-mentioned MCU microcontroller module adopts a 32-bit microcontroller STM32F103C8T6 single-chip microcomputer based on the ARMCortex-M3 core with an operating frequency of up to 72MHz. After the single-chip microcomputer is powered on, it initializes and configures the internal registers of each module chip through the I2C1 and I2C2 buses, uses the signal input by DPU1 as the default display, and then reads the ARINC429 control switching signal state in the corresponding register of the ARINC429 signal selection control module through the SPI bus, and judges the RIFLAG and R1INT interrupt flag signals. After determining the switching signal, it configures the corresponding registers inside the DVI distribution module through the I2C1 and I2C2 bus write operations to realize signal switching DPU1 output and DPU2 output, which is a mixed output of DPU1 and DPU2.

[0074] The ARINC429 signal selection control module uses a CMOS integrated circuit chip HI-3593 that is used to connect a microcontroller supporting a serial peripheral interface (SPI) to the ARINC429 serial bus. The chip provides two receivers, each of which has a user-programmable tag recognition function. The programmable external interrupt pin can be used to monitor the status of the transmission and reception FIFOs, the priority tag buffer, and the ability to switch the validity of the ARINC429 tag bit by polling the HI-3593 status register.

[0075] The power conversion module is powered by the DVI distribution module, video equalization module, ARINC429 signal selection control module, MCU microcontroller module and indicator light. It adopts a two-stage voltage conversion method. The first-stage voltage conversion circuit is connected to the onboard DC28V power supply voltage, and outputs DC5V voltage through self-recovery fuse overcurrent protection, rectifier diode and TVS diode polarity protection, overvoltage protection and high surge current protection, MD10-3DW DC EMI filter, and DC / DC converter. The second-stage voltage conversion circuit uses LT1764A chip to convert DC5V into 3.3V and 2.5V voltages required by each sub-module, such as Figure 5 The above indicator light is a 28V power indicator light, which is used to display the power supply status of the device.

[0076] Embodiment three: Figure 2 This is a block diagram of the operating structure module of a multi-channel DVI video distribution device based on ARINC429 signal selection in the patent of the present invention.

[0077] DVI interface protection module 10, located at the input end, is used to receive DVI video signals from DPU1 and DPU2. The module uses the ESD protection device RCLAMP0524P for high-speed data lines to prevent electrostatic discharge, overvoltage and transient current from damaging the signal line. It ensures that the input DVI video signal is not interfered by static electricity when entering the distribution system and provides stable signal transmission.

[0078] DVI distribution module 20, the module is responsible for processing the input DVI signal into two parts and performing two-to-one signal switching. Signal distribution: The module adopts a four-way 1:2-2:1 multiplexer SN65LVCP114 chip. For the input DPU1 and DPU2 signals, the module divides them into two parts, and sends one of the signals back to the audio and video recorder, and the other signal enters the subsequent equalization processing module and is directly output. Signal switching: Through the multiplexer, two-to-one switching is performed, and the DPU1 signal and the DPU2 signal are selected for output. The switched signals will be transmitted to the subsequent processing module.

[0079] Video equalization module 30, which is responsible for adjusting the DVI signal affected by attenuation during transmission. Signal equalization adjustment: Using the video equalizer DS16EV5110A chip, the module selects the appropriate equalization gain according to the signal transmission distance and attenuation, and adjusts the amplitude and gain through the adjustment parameters transmitted through the I2C interface. The purpose is to compensate for the loss of the signal during long-distance transmission and ensure the signal quality. Gain control: The module has 8 gain levels, and the signal is adjusted by configuring the register to ensure that the video signal reaches the best quality during the transmission process.

[0080] ARINC429 signal selection control module 40, the module is used to receive and parse ARINC429 signals, and control the selection and allocation of DVI signals. Signal reception and analysis: the module receives and parses ARINC429 signals from the outside through the HI-3593 chip. The parsed signal is transmitted to the MCU module through the SPI interface. Control instruction generation: according to the parsed control signal, the MCU module sends instructions to the DVI allocation module through the I2C bus to complete the switching and selection operation of the DVI signal.

[0081] MCU microcontroller module 50, which is used for overall control and coordination of the system, is responsible for managing signal transmission and video distribution. Signal control: The MCU microcontroller is connected to the ARINC429 control module via SPI, receives the ARINC429 signal selection instruction, and is connected to the DVI distribution module and the video equalization module via the I2C bus to adjust the switching, equalization and distribution operations of the signal. Task scheduling: After the device is powered on, the microcontroller initializes the internal registers of each module and ensures that the signal processing and distribution tasks are correctly completed under different video signal input states.

[0082] The power conversion module 60 provides stable power supply support for each component of the system. Voltage conversion: Through a two-stage voltage conversion method, DC28V is converted into 3.3V, 2.5V and other voltages required by the system to ensure the normal operation of each module. The module includes overcurrent protection, polarity protection and high surge current protection to ensure stable power supply of the equipment under various working conditions. Real-time monitoring: Dynamically monitor the power consumption of each module to ensure stable operation of the system under high load conditions.

[0083] Indicator light 70, the module is used to indicate the power supply status of the device. The indicator light is a 28V power indicator light, which is installed on the device to facilitate the operator to monitor the working status of the device. When the device is powered on and operating normally, the indicator light will light up to indicate that the device is in a power supply state.

[0084] Figure 3 The present invention provides a functional block diagram of a multi-channel DVI video distribution device based on ARINC429 signal selection, such as Figure 3As shown, an embodiment of the present invention provides a multi-channel DVI video distribution device based on ARINC429 signal selection, including an ARINC429 control module, a DVI selection distribution unit, a balance adjustment module, and a power conversion module. The ARINC429 control module includes an ARINC429 receiver and an MCU microcontroller. The ARINC429 receiver receives an externally input ARINC429 signal to the MCU microcontroller. After receiving the SPI signal, the MCU microcontroller parses the selection control instruction therein and sends the instruction to each DVI selection distribution unit. The DVI selection distribution unit, each selection distribution unit works independently, each receives the DVI signal input from the front end and the I2C signal sent by the ARINC429 bus control module, modifies the value in the register, and implements the DVI signal 2-to-1 function according to the value in the register. The device includes 11 DVI selection distribution units, which use a cascaded method to implement 14-way DVI input, and finally implement the functions of 14-way output and 6-way selection output.

[0085] The key innovative features of the present invention include: (1) Application of ARINC429 signal control module: ARINC429 signal is applied to DVI video signal selection and distribution to ensure control accuracy and stability in complex aviation environment.

[0086] (2) DVI equalization adjustment technology: The innovative use of dynamic equalization adjustment method solves the attenuation and distortion problems in long-distance DVI signal transmission, improving video transmission quality and anti-interference capabilities.

[0087] The following are its main beneficial effects: (1) Enhanced reliability of long-distance signal transmission: Through the DVI equalization adjustment unit, the signal gain and attenuation during the transmission process are dynamically adjusted, which significantly improves the quality of DVI signals in long-distance transmission and reduces signal distortion and interference.

[0088] (2) Flexible selection and allocation of multi-channel signals: The use of ARINC429 signals for precise control enables the system to quickly and flexibly select and allocate multi-channel DVI video signals, improving the flexibility and efficiency of test tasks.

[0089] (3) Modular design facilitates expansion: The system supports 14-channel DVI input and 6-channel optional output, and is highly scalable, meeting the needs of multi-channel video signal transmission on large aircraft.

[0090] (4) Efficient power management: Through the power conversion module, multi-channel power conversion is realized to ensure that the equipment can still stably provide the required voltage when running at high load, thereby enhancing the mission reliability of the equipment.

[0091] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes and substitutions within the technical scope disclosed in the present application, and the above should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A multi-channel DVI video distribution device based on ARINC429 signal selection, characterized in that: include: ARINC429 control module, used to receive ARINC429 signals, analyze control signals and transmit them to back-end circuits via I2C signals; A DVI selection and distribution unit is used to receive multiple DVI video signals and select a specified DVI signal for distribution and output according to the I2C signal sent by the ARINC429 control module; A balance adjustment module is used to balance the signal strength of the distributed DVI signal; The power conversion module is used to convert the external input power into the operating voltage required by each module of the system.

2. The multi-channel DVI video distribution device based on ARINC429 signal selection according to claim 1, characterized in that: The ARINC429 control module comprises an ARINC429 signal conversion module and a control signal analysis module, and the analyzed signal is transmitted to the DVI selection distribution unit through the I2C bus.

3. The multi-channel DVI video distribution device based on ARINC429 signal selection according to claim 1, characterized in that: The DVI selection and distribution unit adopts a multiplexer to support the signal distribution of one DVI signal being divided into two outputs and two-to-one switching.

4. The multi-channel DVI video distribution device based on ARINC429 signal selection according to claim 1, characterized in that: The equalization adjustment module performs adjustment according to the equalization setting parameters in the register, and selects a gain value to control the output of the DVI signal.

5. The multi-channel DVI video distribution device based on ARINC429 signal selection according to claim 4, characterized in that: The equalization adjustment module includes a plurality of equalization units, each unit processes a DVI signal path, and the control signal is configured through an I2C bus.

6. The multi-channel DVI video distribution device based on ARINC429 signal selection according to claim 1, characterized in that: The power conversion module adopts a two-stage power conversion method to convert the external DC28V power supply into the DC5V, 3.3V and 2.5V voltages required by the system.

7. The multi-channel DVI video distribution device based on ARINC429 signal selection according to claim 6, characterized in that: The power conversion module includes overvoltage protection and overcurrent protection functions.

8. The multi-channel DVI video distribution device based on ARINC429 signal selection according to claim 1, characterized in that: The DVI selection distribution unit supports 14-channel DVI signal input and can selectively output 6-channel DVI signals.

9. The multi-channel DVI video distribution device based on ARINC429 signal selection according to claim 8, characterized in that: The DVI selection and distribution unit uses a cascaded manner to implement the switching of multi-channel signal input and output.

10. The multi-channel DVI video distribution device based on ARINC429 signal selection according to claim 1, characterized in that: The ARINC429 signal control module is connected to the MCU microcontroller via the SPI bus, and the MCU microcontroller controls the switching of the DVI signal distribution via the I2C bus.

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