A multi-channel DVI video distribution device based on ARINC 429 signal selection

Abstract

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

Description

Technical Field

[0001] This invention relates to the field of aviation testing technology, and in particular to a multi-channel DVI video distribution device based on ARINC429 signal selection, which is suitable for scenarios involving long-distance transmission and selection distribution of multiple DVI video signals. Background Technology

[0002] DVI video signals are a widely used digital video format in modern aircraft flight testing, typically requiring simultaneous support from both onboard displays and acquisition equipment. This necessitates the addition of DVI video signal distribution equipment in the test link to split a single signal into two. However, existing DVI video distribution equipment on the market usually only supports single input and dual output, failing to meet the complex requirements of selecting and distributing multiple video signals in a flight testing environment.

[0003] Furthermore, DVI signals are susceptible to external interference during long-distance transmission, especially in complex aviation environments where signal attenuation and noise issues are particularly prominent. Therefore, there is an urgent need for a device capable of reliably selecting and allocating DVI video signals over long distances, with strong anti-interference capabilities to ensure signal transmission stability and quality.

[0004] While some DVI signal splitters exist in the existing technology, their functions and performance are insufficient to fully meet the requirements of multi-channel signal switching, long-distance transmission, and anti-interference, especially in aviation environments. Therefore, how to reliably select and distribute multiple DVI video signals based on ARINC429 signals and ensure signal quality during long-distance transmission is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] This 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 multiple DVI video signals over long distances based on ARINC429 signals, while ensuring the anti-interference capability and transmission quality of the signals in complex aviation environments.

[0006] To address the aforementioned problems, this invention provides a multi-channel DVI video distribution device based on ARINC429 signal selection, comprising: The ARINC429 control module is used to receive ARINC429 signals, parse control signals, and transmit them to the back-end circuit via I2C signals. The DVI selection and allocation unit is used to receive multiple DVI video signals and select the specified DVI signal for allocation and output according to the I2C signal sent by the ARINC429 control module. The equalization adjustment module is used to equalize the signal strength of the distributed DVI signal. The power conversion module is used to convert the externally 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 parsing module. The parsed signal is transmitted to the DVI selection and allocation unit via the I2C bus.

[0008] Furthermore, the DVI selection and allocation unit employs a multiplexer to support signal allocation where one DVI signal is split into two outputs and can be switched between two outputs.

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

[0010] Furthermore, the equalization adjustment module includes multiple equalization units, each of which 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 allocation unit supports 14 DVI signal inputs and can select and output 6 DVI signals.

[0014] Furthermore, the DVI selection and allocation unit adopts a cascaded approach to achieve switching between 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 DVI signal allocation via the I2C bus.

[0016] The key innovations of this invention include: (1) Application of ARINC429 signal control module: The ARINC429 signal is applied to the selection and distribution of DVI video signals, which ensures the control accuracy and stability in complex aviation environment.

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

[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 signal in long-distance transmission and reduces signal distortion and interference.

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

[0020] (3) Modular design facilitates expansion: The system supports 14 DVI inputs and 6 selectable outputs, which has high scalability and meets the needs of large aircraft for multi-channel video signal transmission.

[0021] (4) High-efficiency power management: Through the power conversion module, multiple power conversions are realized to ensure that the equipment can still stably provide the required voltage when operating under high load, thereby enhancing the reliability of the equipment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the operation process of a multi-channel DVI video distribution device based on ARINC429 signal selection provided in an embodiment of the present invention; Figure 2 This is a block diagram of the operational structure of a multi-channel DVI video distribution device based on ARINC429 signal selection, provided in an embodiment of the present invention. Figure 3 This invention provides a schematic block diagram of a multi-channel DVI video distribution device based on ARINC429 signal selection; Figure 4 This invention provides a block diagram of the DVI distribution module of a multi-channel DVI video distribution device based on ARINC429 signal selection; Figure 5 This invention provides a power module schematic diagram of a multi-channel DVI video distribution device based on ARINC429 signal selection. Detailed Implementation

[0023] This invention belongs to the field of aviation testing technology, specifically relating to a multi-channel DVI video distribution device based on ARINC429 signal selection, used for selecting and distributing multiple DVI video signals. The device includes an ARINC429 control module, a DVI selection and distribution unit, an equalization module, and a power conversion module. The ARINC429 control module receives and analyzes ARINC429 signals; the DVI selection and distribution unit selects and outputs DVI video signals based on the analyzed signals; and the equalization module performs equalization processing on the DVI signals to improve transmission quality. The device supports long-distance transmission and has anti-interference capabilities, making it suitable for DVI video signal distribution in complex aviation environments. Compared with existing technologies, this invention provides higher signal stability and transmission quality.

[0024] The multi-channel DVI video distribution device based on ARINC429 signal selection provided in this embodiment of the invention is mainly used to solve the technical problem of "how to reliably select and distribute multiple DVI video signals over long distances based on ARINC429 signals, while ensuring the anti-interference capability and transmission quality of the signals in complex aviation environments".

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit and scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

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

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

[0029] S300, the equalization adjustment module, is used to perform signal strength equalization processing on the distributed DVI signal.

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

[0031] Step S100 includes steps S110-S130: S110. The ARINC429 signal control module receives command signals from the control system and transmits the signals to the microcontroller unit (MCU) via the SPI interface. The MCU reads and parses the ARINC429 control signals.

[0032] Specifically, when the system starts up, the ARINC429 signal selection control module will begin receiving ARINC429 signals transmitted by the airborne system. These signals are data signals collected by external devices and airborne sensors, primarily including AR_signal(t), where t represents the time variable of signal transmission. The signals then enter the MCU microcontroller module through the ARINC429 interface.

[0033] In the aforementioned steps, the input AR_signal(t) signal is generated by various airborne systems and test equipment, such as test flight instruments and display systems. The ARINC429 interface module transmits the control information in 32-bit word form via a standard serial communication protocol. The signal transmission primarily utilizes standard frames in the bus protocol, which include a synchronization bit (SYN), a data field (DATA), and a parity check (P) to ensure data integrity.

[0034] S120. Based on the parsed signal, the MCU analyzes the quality of the DVI video signal transmission process and feeds the data back to the video signal processing module. Specifically: Furthermore, the MCU microcontroller module reads and parses the received signals from the ARINC429 signal selection module via 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 Here, SYN represents the synchronization part of the frame and is used to identify the start of the signal; DATA represents the main data field of the frame, which contains the transmission instructions and control signals; and P represents the parity bit, which is used for data verification.

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

[0036] The parsed signal can be represented as AR_cmd and stored in the MCU's internal registers. The parsing logic for AR_cmd is as follows: AR_cmd=F(AR_frame) Here, F is the parsing function, which converts the received frame into specific control signal commands. The AR_cmd signal value indicates different operations, such as signal switching, equalization, and amplification.

[0037] S130: Through the I2C interface, the MCU transmits the analysis results to the video equalization module, providing equalization adjustment parameters. Specifically: The MCU (Microcontroller Unit) transmits the parsed AR_cmd signal to the next-level module, the video signal processing module, via the I2C bus. Specifically, the AR_cmd value determines the selection and switching of the DVI signal. For example, assuming the AR_cmd value is Switch_1, indicating that the video signal from 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 above steps can be represented as: I2C_cmd=G(AR_cmd) G is the I2C signal generation function, which converts the control commands parsed by the MCU into I2C signal format. 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 via the I2C bus, the module will perform video signal selection and allocation operations according to the transmitted instructions, such as performing a two-to-one selection of DPU1 and DPU2 signals, and other equalization adjustment operations.

[0040] Step Connection and Subsequent Use: The parsed signal instruction AR_cmd and the generated control signal I2C_cmd directly affect the operation of the subsequent video signal processing module. These instructions guide the subsequent video signal processing module in switching, equalization, and allocation operations, ensuring the normal transmission and quality adjustment of the DVI signal. For example, when the video signal processing module receives the I2C_cmd Switch_1 instruction, it will perform a two-to-one switching operation of the DVI signal according to the information transmitted by the I2C bus, outputting the video signal of DPU1 to the video display and acquisition device. The video equalization module will then 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 signal attenuation during transmission. The I2C_cmd signal generated in step S130 plays a crucial bridging role in the entire system, effectively connecting the parsed ARINC429 signal with the actual video signal processing operations.

[0041] Step S200 includes at least steps S210-S230: S210: Receives multiple DVI video signals from DPU1 and DPU2 via the video distribution module and monitors 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 begins operation. This module receives DVI video signals from DPU1 and DPU2 through a 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. Upon entering the system, the signals are first protected by an ESD protection module to ensure they are not affected by interference from electrostatic discharge, surge current, etc.

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

[0043] The interface protection module ensures that the DVI signal is transmitted intact to the system for use by subsequent processing modules. This module further guarantees signal quality, laying the foundation for subsequent signal allocation and selection operations.

[0044] The multiplexer in the S220 video distribution module switches and selects the DVI signal source via control signals transmitted from the MCU, and adjusts the signal distribution path according to the state of the input signal. Specifically: Furthermore, upon receiving the DVI_{protected} signal, the system uses a four-way 1:2 multiplexer to split each DVI signal into two. At this point, 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 similarly divided into DVI_out2a and DVI_out2b. This allocation process can be represented 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 passed to the video equalization module, while DVI_out1b and DVI_out2b are passed directly to the output interface module. Through this split-signal process, the signal is effectively distributed to support parallel processing by multiple downstream modules, improving the system's processing efficiency.

[0045] During this process, DVI_out1a and DVI_out2a will be further fed into the video equalization module for signal enhancement and attenuation compensation, while DVI_out1b and DVI_out2b will be used for direct 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 state is correctly recorded for subsequent adjustment and output. Specifically: Upon receiving the control command I2C_cmd from the MCU, the multiplexer of the video signal processing module performs a two-to-one selection of the DVI signals according to the control signal. Specifically, when the command transmitted by I2C_cmd is to select DPU1, the system selects one signal from DVI_out1a and DVI_out1b for output; when I2C_cmd selects DPU2, the system selects one signal from DVI_out2a and DVI_out2b for output.

[0047] The selection process can be represented by the following formula: DVI_{selected}=Select(I2C_{cmd},DVI_{out1a},DVI_{out2a},DVI_{out1b},DVI_{out2b}) The Select() function performs a signal selection operation based on the instructions in I2C_cmd. DVI_{selected} represents the final selected output signal, which is used by downstream display devices and acquisition devices.

[0048] The connection between the preceding and following steps: The signal switching step in S230, which transmits the I2C_cmd signal generated by S130, ensures that the entire system operates according to the predetermined logic and control commands. Based on the commands parsed from the I2C_cmd, the multiplexer in S230 performs switching and distribution operations on the DVI signal, thereby realizing dynamic switching between DPU1 and DPU2 signals to meet different needs during flight testing.

[0049] Step S300 includes at least S310-S330: The S310 video equalization module receives equalization adjustment parameters from the MCU via an I2C interface. Specifically: The video equalization module receives DVI signals through the video signal processing module. Specifically, the module receives the DVI signals allocated in step S220, including DVI_out1a and DVI_out2a, which are the signals from DPU1 and DPU2 after being split in two. The system obtains the equalization adjustment parameters, specifically the gain value G_eq, from the MCU microcontroller module via the equalization module's I2C bus.

[0050] The gain value G_eq is used to adjust the signal strength to adapt to the signal transmission requirements at different distances. The equalization adjustment process can be represented as: DVI_{eq}=EQ(DVI_{in},G_{eq}) Where DVI_{eq} is the DVI signal after equalization adjustment, EQ() is the equalization adjustment operation function, 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, ensuring that the signal maintains stable quality after long-distance transmission. This step relies heavily 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: Based on 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's memory. Specifically: Next, the video equalization module compensates for signal attenuation by adjusting the signal amplitude and gain based on the signal attenuation during transmission. Specifically, the system detects the signal after long-distance transmission to determine the signal attenuation A_{loss}, and adjusts the amplitude and gain through registers in the equalization module to compensate for the attenuation loss during transmission.

[0053] The formula for calculating attenuation compensation is: DVI_{comp}=DVI_{eq}\times(1+A_{comp}) Where 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 point, 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 subsequent modules.

[0055] The S330 equalizer module feeds back the equalization adjustment status to the MCU through its internal registers, preparing for the next signal output. Specifically: After equalization 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 signal during display and acquisition.

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

[0057] The connection between the preceding and following steps: In step S310, the equalization gain value G_eq obtained via the I2C bus is determined by the MCU control signal transmitted in step S130. This equalization adjustment parameter is closely related to the signal transmission conditions. The attenuation compensation parameter A_{comp} in step S320 is calculated through analysis of the transmission distance and real-time environmental monitoring to ensure that the signal quality does not significantly degrade under long-distance transmission conditions. Step S330, through the adjustment and compensation of the first two steps, outputs a high-quality video signal to the subsequent processing module, ultimately completing the signal transmission and display.

[0058] Step S400 includes at least S410-S430: The S410 and MCU transmit the equalized DVI signal to the output module via the I2C interface. The output module then controls the output of the video signal according to current requirements. Specifically: In the implementation of this invention, the dynamic power management module receives a 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 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 through a second-stage voltage conversion module to provide power to various sub-modules according to their different power requirements.

[0059] Specifically, the system operates according to the power requirements of each module. For example, the MCU microcontroller module requires 3.3V, while the DVI distribution module and the ARINC429 signal selection control module require 2.5V. Through this first-stage and second-stage voltage conversion, a stable power distribution is provided for the entire system, ensuring its normal operation. The formula is expressed as: V_{out1}=f(V_{in},G_{p1}) V_{out2}=f(V_{out1},G_{p2}) Wherein, V_{in} is the DC28V input voltage, G_{p1} and G_{p2} are the gain factors of the first and second stage 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] The S420 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 (e.g., higher than the specified maximum voltage or lower than the minimum voltage threshold), the system will immediately trigger the protection mechanism to prevent damage to the equipment caused by excessively high or low voltage.

[0061] Simultaneously, the power protection module also monitors the current. If the detected current exceeds the rated value, the system will automatically cut off the power supply through the fuse and protection circuit to prevent damage to the module due to excessive current. The protection trigger conditions for voltage and current can be expressed by the following formula: Where P_{voltage} represents the voltage protection state, and 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} or P_{current} is triggered, it will interrupt the power supply and feed back the fault information to the MCU microcontroller module for further processing.

[0063] The S430 output module transmits signals to the final display and acquisition terminal, and the system adjusts the output status in real time through a dynamic feedback mechanism. Specifically: During system operation, the dynamic power management module also monitors and dynamically adjusts energy consumption based on actual load requirements. Specifically, the power management module monitors the power consumption of each module in real time and, in conjunction with load data provided by the MCU microcontroller module, dynamically adjusts power distribution. Through this mechanism, the system can minimize power consumption and improve system energy efficiency while meeting normal operating requirements.

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

[0065] In addition, real-time monitoring of energy consumption data is fed back to the MCU microcontroller module to ensure that the power consumption of the entire system is always at an optimal level. This dynamic adjustment process also helps extend the lifespan of the equipment and improve task reliability.

[0066] Explanation of the transitions between steps: In the S410 intelligent power supply process, the system completes two-stage voltage conversion to provide the required voltage to each module. In step S420, by monitoring the input voltage and current in real time, the system ensures that any overvoltage or overcurrent situations during power supply can be handled promptly 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 throughout the entire operation.

[0067] Example 2: This invention provides a multi-channel DVI video distribution device based on ARINC429 signal selection, including 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 indicator lights, such as... Figure 3 As shown.

[0068] The aforementioned DVI interface protection module uses 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 electrostatic discharge, cable discharge, and transient overvoltage and overcurrent damage caused by electrical fast transients.

[0069] The aforementioned DVI distribution module uses a four-channel 1:2-2:1 multiplexer to receive the DVI multi-channel video signals from DPU1 and DPU2 input via the DVI interface protection circuit. It then performs a 1-to-2 and 2-to-1 distribution process. One of the signals from the DPU1 signal after being split into two is input to the video equalization module, adjusted, and then connected to the 2-to-1 multiplexer. The other signal is connected to the output of the DVI interface protection circuit. Similarly, one of the signals from the DPU2 signal after being split into two is connected to the DVI interface protection circuit output to the aviation connector, and the other signal is directly connected to the 2-to-1 multiplexer.

[0070] The aforementioned four 1:2 to 2:1 multiplexers utilize the SN65LVCP114 chip, which has three ports and supports multi-rate operation up to 14.2Gbps serial data rates. The DVI signal is input through the CIN port, regulated by a linear receiver equalizer, then processed by a 1:2 multiplexer, split into two, and output from AOUT and BOUT via linear drivers. The DVI signals from DPU1 and DPU2 switching are input through the BIN and AIN ports respectively, regulated by a linear receiver equalizer, then processed by a 2:1 multiplexer, and output from COUT via a linear driver. Each port of the linear receiver equalizer and linear driver can be independently programmed via the I2C configuration interface to access the corresponding configuration registers, such as... Figure 4 As shown.

[0071] The aforementioned video equalization module uses the DS16EV5110A video equalizer for DVI source / repeater / sink applications, which has 8 equalization levels. It can select the appropriate equalization level and configure the corresponding registers through the I2C configuration interface according to the onboard signal transmission conditions to provide optimal signal enhancement and reduce inter-symbol interference, thereby improving signal transmission quality.

[0072] The aforementioned MCU microcontroller module connects to the ARINC429 signal selection control module via an SPI bus interface to obtain the input ARINC429 control switching signal status. It also connects to the DVI distribution module's 2-to-1 multiplexer via an I2C bus to configure the switching of multi-channel DVI video signals. Simultaneously, the MCU microcontroller module connects to the DVI distribution module and the video equalization module via an I2C bus interface to configure signal splitting (one-to-two), amplitude, gain, and equalization adjustments.

[0073] The aforementioned MCU microcontroller module uses an ARM Cortex-M3 core-based 32-bit STM32F103C8T6 microcontroller with a maximum operating frequency of 72MHz. After the device is powered on, the microcontroller initializes and configures the internal registers of each module chip via the I2C1 and I2C2 buses. The signal input from DPU1 is used as the default display. Then, the ARINC429 signal is read from the ARINC429 control switch signal state in the corresponding register of the selection control module via the SPI bus, and the RIFLAG and R1INT interrupt flag signals are judged. After determining the switching signal, the corresponding register inside the DVI allocation module is configured via the I2C1 and I2C2 buses to realize the signal switching between DPU1 output and DPU2 output, which is a mixed output of DPU1 and DPU2.

[0074] The aforementioned ARINC429 signal selection control module uses a CMOS integrated circuit chip, HI-3593, which supports a microcontroller connected to the ARINC429 serial bus via a Serial Peripheral Interface (SPI). This chip provides two receivers, each with user-programmable tag identification functionality. The status of the transmit and receive FIFOs, priority tag buffers, and the ability to toggle ARINC429 tag bit validity can be monitored using a programmable external interrupt pin and by polling the HI-3593 status register.

[0075] The aforementioned power conversion module supplies power to the DVI distribution module, video equalization module, ARINC429 signal selection control module, MCU microcontroller module, and indicator lights. It employs a two-stage voltage conversion method. The first-stage voltage conversion circuit connects to the onboard DC 28V power supply, protected by a self-resetting fuse for overcurrent, rectifier diode and TVS diode polarity protection, overvoltage protection, and high surge current protection. It also includes an MD10-3DW DC EMI filter and a DC / DC converter outputting DC 5V. The second-stage voltage conversion circuit uses an LT1764A chip to convert the DC 5V to the 3.3V and 2.5V voltages required by each sub-module, such as... Figure 5 As shown above, the indicator light is a 28V power indicator, used to display the power supply status of the device.

[0076] Example 3: Figure 2 This is a block diagram of the operational structure of a multi-channel DVI video distribution device based on ARINC429 signal selection, as per this invention patent.

[0077] DVI interface protection module 10, located at the input end, is used to receive DVI video signals from DPU1 and DPU2. This module employs an ESD protection device RCLAMP0524P for high-speed data lines to prevent damage to the signal lines from electrostatic discharge, overvoltage, and transient current. It ensures that the input DVI video signal is not subject to electrostatic interference when entering the distribution system and provides stable signal transmission.

[0078] DVI distribution module 20 is responsible for splitting the input DVI signal into two and performing a two-to-one signal switching. Signal distribution: The module uses a four-channel 1:2-2:1 multiplexer chip SN65LVCP114. For the input DPU1 and DPU2 signals, the module splits them into two, sending one signal back to the audio / video recorder, while the other signal enters the subsequent equalization processing module and is directly output. Signal switching: The multiplexer performs a two-to-one switching, selecting the DPU1 signal or the DPU2 signal for output. The switched signal is then transmitted to the subsequent processing module.

[0079] The video equalization module 30 is responsible for adjusting the DVI signal affected by attenuation during transmission. Signal equalization adjustment: Employing a DS16EV5110A video equalizer chip, the module selects an appropriate equalization gain based on the signal transmission distance and attenuation, adjusting the amplitude and gain according to the adjustment parameters transmitted via the I2C interface. Its purpose is to compensate for signal loss during long-distance transmission and ensure signal quality. Gain control: The module has eight gain levels, and signal adjustment is performed through configuration registers to ensure optimal video signal quality during transmission.

[0080] ARINC429 signal selection control module 40 is used to receive and parse ARINC429 signals to control the selection and allocation of DVI signals. Signal reception and parsing: The module receives and parses ARINC429 signals from external sources via a HI-3593 chip. The parsed signal is then transmitted to the MCU module via the SPI interface. Control command generation: Based on the parsed control signal, the MCU module sends commands to the DVI allocation module via the I2C bus to complete the switching and selection operation of the DVI signal.

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

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

[0083] Indicator light 70 is used by the module to indicate the power supply status of the device. The indicator light is a 28V power indicator and is installed on the device to allow the operator to monitor its operation. When the device is powered on and operating normally, the indicator light will illuminate, indicating that the device is powered.

[0084] Figure 3 This invention provides a schematic diagram of a multi-channel DVI video distribution device based on ARINC429 signal selection, as shown below. Figure 3As shown, this embodiment of the invention provides a multi-channel DVI video distribution device based on ARINC429 signal selection, including an ARINC429 control module, DVI selection and distribution units, an equalization adjustment module, and a power conversion module. The ARINC429 control module includes an ARINC429 receiver and an MCU microcontroller. The ARINC429 receiver receives externally input ARINC429 signals and sends them to the MCU microcontroller. After receiving the SPI signal, the MCU microcontroller parses the selection control instructions and sends them to each DVI selection and distribution unit. Each DVI selection and distribution unit operates independently, receiving both the DVI signals input from the front end and the I2C signals sent by the ARINC429 bus control module, modifying the values ​​in its registers, and implementing a 2-to-1 DVI signal selection function based on the register values. The device includes 11 DVI selection and distribution units, cascaded to achieve 14 DVI inputs, ultimately realizing 14 outputs and 6 selection outputs.

[0085] The key innovations of this invention include: (1) Application of ARINC429 signal control module: The ARINC429 signal is applied to the selection and distribution of DVI video signals, which ensures the control accuracy and stability in complex aviation environment.

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

[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 signal in long-distance transmission and reduces signal distortion and interference.

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

[0089] (3) Modular design facilitates expansion: The system supports 14 DVI inputs and 6 selectable outputs, which has high scalability and meets the needs of large aircraft for multi-channel video signal transmission.

[0090] (4) High-efficiency power management: Through the power conversion module, multiple power conversions are realized to ensure that the equipment can still stably provide the required voltage when operating under high load, thereby enhancing the reliability of the equipment.

[0091] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations and substitutions within the technical scope disclosed in this application, and all such variations should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A multi-channel DVI video distribution device based on ARINC429 signal selection, characterized in that, include: The ARINC429 control module is used to receive ARINC429 signals, parse control signals, and transmit them to the back-end circuit via I2C signals. The MCU microcontroller is connected to the ARINC429 control module via the SPI bus. It is used to receive and parse the ARINC429 signals, generate control commands, and output them via the I2C bus. The DVI selection and allocation unit includes a multiplexer for receiving multiple DVI video signals, splitting each DVI signal into two, and configuring the internal registers via the I2C bus according to the MCU microcontroller to select the specified DVI signal by performing a two-to-one output. The multiplexer is a four-channel 1:2-2:1 multiplexer using the SN65LVCP114 chip, which has a linear receiver equalizer and a linear driver. Each DVI signal is input through the CIN port, adjusted by the linear receiver equalizer, and then input to the 1:2 multiplexer for splitting into two, before being output from the two output ports via the linear driver. The linear receiver equalizer and linear driver at each port are independently programmed through the I2C configuration interface to configure their respective registers. The multiplexer splits each input DVI signal into two, outputting the first DVI signal to the equalization module for equalization, and directly outputting the second DVI signal to the DVI output interface; the two-to-one output selects one of the signals from the signal equalized by the equalization module and the directly output signal as the specified DVI signal output. The equalization adjustment module is connected to the MCU microcontroller via the I2C bus. It is used to receive the first DVI signal and perform signal strength equalization processing on the first DVI signal according to the equalization level register value configured by the MCU microcontroller, and generate the equalized signal as a candidate signal for the two-to-one output. The power conversion module is used to convert the externally input power into the operating voltage required by each module of the system; After the MCU microcontroller is powered on, it initializes and configures the internal register of the DVI selection allocation unit through the I2C bus, and uses the default input DVI signal as the default output. During operation, the MCU microcontroller reads the ARINC429 control switching signal status in the register of the ARINC429 control module via the SPI bus, and determines the interrupt flag signal. When it is determined that signal switching is required, it configures the internal register of the DVI selection allocation unit through the I2C bus write operation to realize the switching of the DVI signal source.

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

3. 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.

4. The multi-channel DVI video distribution device based on ARINC429 signal selection according to claim 3, characterized in that, The power conversion module includes overvoltage protection and overcurrent protection functions.

5. The multi-channel DVI video distribution device based on ARINC429 signal selection according to claim 1, characterized in that, The DVI selection and allocation unit supports 14 DVI signal inputs and can select and output 6 DVI signals.

6. The multi-channel DVI video distribution device based on ARINC429 signal selection according to claim 5, characterized in that, The DVI selection and allocation unit uses a cascaded approach to switch between multi-channel signal input and output.

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