Dvi video signal transmission method and system with adaptive equalization parameter correction

Abstract

The application provides a DVI video signal transmission method and system with adaptive equalization parameter correction. A feature code or a control word is added to a DVI signal transmitting end, and the form of the feature code or the control word is analyzed and recognized at a receiving end to diagnose whether the received video quality meets the display requirement. When the received video quality does not meet the display requirement, the related coefficient of the receiving end is adjusted by adaptive optimization of equalization parameters, so that high-quality display of the received video is realized. The application realizes self-defined video quality diagnosis technology to determine the video transmission quality, and automatically adjusts the equalization parameters of the receiving end by the method of optimization of equalization parameters, so that the problem that the equalization parameters need to be manually adjusted due to the inconsistency of the characteristics of different transmission cables in the process of high-speed DVI video transmission is solved, and the transmission compatibility of high-speed DVI video signals is improved.

Description

Technical Field

[0001] This invention belongs to the field of high-speed video signal transmission technology, specifically relating to a DVI video signal transmission method and system with adaptive equalization parameter correction. Background Technology

[0002] As display resolution continues to improve and the application of 2K / 4K video becomes more widespread and popular, the impact of attenuation and interference in high-speed video signals during transmission is becoming increasingly severe. To solve display problems caused by video signal transmission, technologies such as video receiver equalization introduced by the industry are becoming increasingly mature.

[0003] Considering that high-speed video signal transmission is significantly affected by transmission paths or cables, uniform receiver equalization parameters cannot accurately adapt to all transmission state changes. To address the issue of equalization parameter adaptability, this invention proposes an adaptive equalization parameter correction method to expand the application scope of equalization technology and increase the configuration compatibility of equalization parameters. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a DVI video signal transmission method and system with adaptive equalization parameter correction. By adding a feature code or control word to the DVI signal transmitter, the receiver parses and identifies the feature code or control word to diagnose whether the received video quality meets display requirements. If the display requirements are not met, the receiver correlation coefficient is adjusted through adaptive optimization of equalization parameters to achieve high-quality display of the received video. This invention determines video transmission quality through a custom video quality diagnosis technology and automatically adjusts the receiver equalization parameters through an optimization method. This solves the problem of requiring manual intervention to adjust equalization parameters due to inconsistencies in the characteristics of different transmission cables during high-speed DVI video transmission, improves the transmission compatibility of high-speed DVI video signals, avoids manually adjusting equalization parameters for each product, and thus improves product adaptability and production efficiency.

[0005] A method for DVI video signal transmission with adaptive equalization parameter correction, characterized by the following steps: Step 1: Generate a standard DVI parallel timing signal for final display. Add a feature code to the non-graphic signal timing region in the DVI timing signal. The feature code consists of three parts, including the feature code start identifier 0xaa55ff, the data value of the row number of the feature code, and the feature code check value. The feature code check value is equal to the data value obtained by summing the first two data items and then taking the inverse. Step 2: Transmit the DVI video signal containing the signature code; Step 3: The receiving end receives and identifies the DVI video signal containing the feature code to obtain its feature code; Step 4: Calculate the accuracy rate of feature code recognition and use the accuracy rate as the video quality evaluation value; Step 5: Incrementally adjust the equalization parameters at the receiving end until the recognition accuracy reaches 100%, which is considered the optimal video quality. Stop adjusting the equalization parameters, save and report the parameter values ​​at this time.

[0006] Furthermore, the feature code is replaced with a control word.

[0007] This invention also relates to a DVI video signal transmission system implementing the method described above, comprising a DVI transmitter module, a transmission cable, and a DVI receiver module. The DVI transmitter module includes a DVI signal generation unit and a feature encoding unit. The DVI signal generation unit generates a standard DVI parallel timing signal for final display. The feature encoding unit adds transmission feature codes or control words to the non-graphic signal timing region of the standard DVI parallel timing signal. The DVI receiver module includes an equalizer chip, a feature decoding unit, a video quality detection unit, and an equalizer parameter optimization and adjustment unit. The equalizer chip is a commercial or industrial-grade chip containing an equalizer parameter configuration interface. The feature decoding unit identifies the transmission feature codes or control words added to the non-graphic signal timing region of the transmitter and latches the feature codes and control words for subsequent use. The video quality detection unit detects the feature codes or control words of the feature decoding unit, judges and statistically analyzes the accuracy of the feature codes or the state of the control words within a certain period, and summarizes and reports the detection results to the subsequent stage. The equalizer parameter optimization and adjustment unit determines the adjustment target of the equalizer parameters based on the detection state of the video quality detection unit and implements equalizer parameter adjustment until the optimal equalizer parameter value for video quality is obtained.

[0008] The beneficial effects of this invention are: by implementing a custom video quality diagnostic technology to determine video transmission quality, and by automatically adjusting the equalization parameters at the receiving end through a method of optimizing equalization parameters, the need for manually adjusting equalization parameters for each product is avoided, the application scope of equalization technology is expanded, and the configuration compatibility of equalization parameters is increased, thereby improving product adaptability and production efficiency. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the timing signal for feature code encoding in this invention; Figure 2 This is a schematic diagram of the DVI video signal transmission system with adaptive equalization parameter correction according to the present invention. Detailed Implementation

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments. The present invention includes, but is not limited to, the following embodiments.

[0011] This invention provides a method for DVI video signal transmission with adaptive equalization parameter correction, the main implementation process of which is as follows: Step 1: Generate standard DVI parallel timing signals for final display, and add feature codes or control words to the non-graphics signal timing regions of the DVI timing signals. Figure 1 A schematic diagram of the timing signal for feature code encoding is given, which shows that the feature code is added at the rising edge of the line synchronization signal (non-graphic signal timing region) of the DVI timing signal. The feature code consists of three parts, including the feature code start identifier 0xaa55ff, the data value of the line number of the feature code, and the feature code check value. The feature code check value is equal to the sum of the first two data values ​​and the inverted value.

[0012] Step 2: Transmit the DVI video signal containing the signature code.

[0013] Step 3: The receiving end receives and identifies the DVI video signal containing the feature code to obtain its feature code.

[0014] Step 4: Calculate the accuracy rate of feature code recognition and use the accuracy rate as the video quality evaluation value.

[0015] Step 5: Incrementally adjust the equalization parameters at the receiving end until the recognition accuracy reaches 100%, which is considered the optimal video quality. Stop adjusting the equalization parameters, save and report the parameter values ​​at this time.

[0016] like Figure 2 As shown, the present invention also provides a DVI video signal transmission system for implementing the above-mentioned adaptive equalization parameter correction method, including a DVI transmitter module, a transmission cable, and a DVI receiver module. The DVI transmitter module includes a DVI signal generation unit and a feature encoding unit. The DVI signal generation unit is used to generate standard DVI parallel timing signals for final display, and can use GPU hardware for display rendering, such as commonly used iMX6 GPU graphics chips. The feature encoding unit adds transmission feature codes or control words to the non-graphic signal timing region of the standard DVI parallel timing signals, and is implemented based on FPGA hardware, such as Xilinx's 7 series FPGA.

[0017] DVI video signals containing feature codes or control word data reach the DVI receiver via a transmission cable. The DVI receiver module includes an equalizer chip, a feature decoding unit, a video quality detection unit, and an equalizer parameter optimization and adjustment unit. The equalizer chip is a commercial or industrial-grade chip with an equalizer parameter configuration interface; received data is transmitted to the feature decoding unit via the equalizer chip. The feature decoding unit identifies transmission feature codes or control words added in non-graphic signal timing regions at the transmitting end and latches them for subsequent use. The video quality detection unit detects the feature codes or control words from the feature decoding unit, judges and statistically analyzes the accuracy of the feature codes or the state of the control words within a certain period, and summarizes and reports the detection results to subsequent stages. The equalizer parameter optimization and adjustment unit determines the adjustment target of the equalizer parameters based on the detection status of the video quality detection unit, implements equalizer parameter adjustments, and obtains the equalizer parameter values ​​for optimal video quality. The adaptive equalizer parameter correction methods implemented by the feature decoding unit, video quality detection unit, and equalizer parameter optimization and adjustment unit are all based on FPGA hardware.

Claims

1. A method for DVI video signal transmission with adaptive equalization parameter correction, characterized in that... The steps are as follows: Step 1: Generate a standard DVI parallel timing signal for final display. Add a feature code to the non-graphic signal timing region in the DVI timing signal. The feature code consists of three parts, including the feature code start identifier 0xaa55ff, the data value of the row number of the feature code, and the feature code check value. The feature code check value is equal to the data value obtained by summing the first two data items and then taking the inverse. Step 2: Transmit the DVI video signal containing the signature code; Step 3: The receiving end receives and identifies the DVI video signal containing the feature code to obtain its feature code; Step 4: Calculate the accuracy rate of feature code recognition and use the accuracy rate as the video quality evaluation value; Step 5: Incrementally adjust the equalization parameters at the receiving end until the recognition accuracy reaches 100%, which is considered the optimal video quality. Stop adjusting the equalization parameters, save and report the parameter values ​​at this time.

2. The DVI video signal transmission method with adaptive equalization parameter correction as described in claim 1, characterized in that: The feature code is replaced with a control word.

3. A DVI video signal transmission system for implementing adaptive equalization parameter correction as described in claim 1 or 2, comprising a DVI transmitter module, a transmission cable, and a DVI receiver module, characterized in that: The DVI transmitter module includes a DVI signal generation unit and a feature encoding unit. The DVI signal generation unit generates a standard DVI parallel timing signal for final display. The feature encoding unit adds transmission feature codes or control words to the non-graphic signal timing region of the standard DVI parallel timing signal. The DVI receiver module includes an equalizer chip, a feature decoding unit, a video quality detection unit, and an equalizer parameter optimization and adjustment unit. The equalizer chip is a commercial or industrial-grade chip with an equalizer parameter configuration interface. The feature decoding unit identifies the transmission feature codes or control words added to the non-graphic signal timing region of the transmitter and latches the feature codes and control words for use by subsequent stages. The video quality detection unit detects the feature codes or control words of the feature decoding unit, judges and statistically analyzes the accuracy of the feature codes or the status of the control words within a certain period, and summarizes and reports the detection results to subsequent stages. The equalizer parameter optimization and adjustment unit determines the adjustment target of the equalizer parameters based on the detection status of the video quality detection unit, implements equalizer parameter adjustment, and obtains the equalizer parameter value with the best video quality.

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