An audio testing system based on DP signals

Abstract

This invention discloses an audio testing system based on DP signals, comprising: a main control module configured to generate and output test DP audio signals; a device under test (DUT) having at least one interface capable of receiving DP signals, configured to receive and decode the test DP audio signals; an output interface configured to output the decoded test DP audio signals; and an audio processing module connected to the output interface, configured to receive and parse the decoded test DP audio signals, and transmit the parsed test DP audio signals to the main control module to form a test transmission link. This invention uses the main control module to provide test DP audio signals, transmitting the complete signal to the DUT to simulate real audio signals. The audio signals received by the DUT are then fed back to the main control module for signal analysis via the output interface and the audio processing module, thereby achieving the conversion of acoustic and electrical signals and realizing a complete link test of the DP signal from transmission to reception within the system.

Description

Technical Field

[0001] This invention belongs to the field of virtual reality technology, and in particular relates to an audio testing system based on DP signals. Background Technology

[0002] Virtual Reality (VR) applications have extremely high requirements for transmission interfaces, and DisplayPort (DP) is one of the few ideal choices. DisplayPort is a high-definition digital display interface standard that can connect to computers, monitors, head-mounted displays, home theaters, and more. It provides a scalable digital display interface, with optional audio and high-definition content protection features, enhancing the ability to selectively transmit high-quality digital audio content.

[0003] Before electronic devices equipped with DisplayPort leave the factory, the configured DP interface and the transmitted signals also need to be tested. However, most test systems do not have the ability to test the communication transmission of DP interface. The testing of DP interface has problems such as low efficiency and difficulty in guaranteeing the stability of test results.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] To address the issues of low testing efficiency and difficulty in ensuring stable test results for DP interfaces in head-mounted display devices, this application designs and provides an audio testing system based on DP signals.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0007] An audio testing system based on DP signals includes: a main control module configured to generate and output test DP audio signals; a device under test (DUT) having at least one interface capable of receiving DP signals, configured to receive and decode the test DP audio signals; an output interface configured to output the decoded test DP audio signals; and an audio processing module connected to the output interface, configured to receive and parse the decoded test DP audio signals, and transmit the parsed test DP audio signals to the main control module to form a test transmission link.

[0008] In some optional embodiments of this application, the audio testing system further includes: a signal conditioning module, the input terminal of which is electrically connected to the main control module and the output terminal of which is electrically connected to the device under test. The signal conditioning module is configured to perform relay processing on the test DP audio signal generated and output by the main control module and output the processed test DP audio signal to the device under test.

[0009] In some optional embodiments of this application, the audio testing system further includes a UPS power supply module, which supplies power to the main control module, the signal conditioning module and the audio processing module respectively.

[0010] In some optional embodiments of this application, the power supply circuits of the main control module, signal conditioning module, and audio processing module are connected to the grounding terminal of the UPS power module.

[0011] In some optional embodiments of this application, the signal circuits of the signal conditioning module, the audio processing module, and the output interface are connected to the grounding terminal of the device under test.

[0012] In some optional embodiments of this application, differential communication is used between the device under test and the output interface, and differential communication is used between the output interface and the audio processing module.

[0013] In some optional embodiments of this application, the output interface and the audio processing module are provided with: a first differential signal line, one end of which is connected to the output interface and the other end of which is connected to the audio processing module; a second differential signal line, which is connected in parallel with the first differential signal line; a first resistor is provided between the first differential signal line and the ground terminal of the device under test, and a second resistor is provided between the second differential signal line and the ground terminal of the device under test; the resistance values ​​of the first resistor and the second resistor are the same.

[0014] In some optional embodiments of this application, the resistance values ​​of the first resistor and the second resistor are 8Ω.

[0015] In some optional embodiments of this application, the resistance values ​​of the first resistor and the second resistor are 16Ω.

[0016] In some optional embodiments of this application, the resistance values ​​of the first resistor and the second resistor are 32Ω.

[0017] In some optional embodiments of this application, the audio testing system further includes: an AC adapter module, one end of which is connected to the UPS power module and the other end of which is connected to the signal conditioning module, wherein the UPS power module supplies power to the signal conditioning module through the AC adapter module.

[0018] In some optional embodiments of this application, the power supply circuit of the AC adapter module is connected to the grounding terminal of the UPS power module.

[0019] Compared with the prior art, the advantages and positive effects of the present invention are as follows: The audio testing system based on DP signal provided by the present invention provides a test DP audio signal through the main control module and transmits the complete signal to the device under test to simulate a real audio signal. The audio signal received by the device under test is fed back to the main control module for signal analysis through the output interface and audio processing module. This realizes the conversion of DP signal electrical signal to acoustic signal to electrical signal, and realizes the complete link test of DP signal from transmission to reception in the system, that is, completes the detection of the integrity and stability of DP signal during transmission.

[0020] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic block diagram of the structure of an audio testing system based on DP signals provided for some embodiments of this application;

[0023] Figure 2 A schematic block diagram of the structure of an audio testing system based on DP signals provided for some embodiments of this application;

[0024] Figure 3 This is a schematic diagram of the circuit structure of an audio testing system based on DP signals provided in some embodiments of this application. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] To address the issues of low testing efficiency and difficulty in guaranteeing stable test results for DisplayPort (DP) interfaces in electronic devices, this application designs and provides an audio testing system based on DP signals. The audio testing system provided in this application is suitable for testing electronic devices with DP interfaces and audio functions, including but not limited to head-mounted displays, monitors, home theaters, and game consoles.

[0028] The following is for reference Figure 1 An audio testing system based on DP signals is introduced. For example... Figure 1 As shown, the audio testing system 1 based on DP signals includes several components such as a main control module 10, a device under test 11, an output interface 12, and an audio processing module 13. The main control module 10, as an automatic testing device, is configured to generate and output test DP audio signals; in some optional embodiments of this application, the main control module 10 can be implemented by a host computer. The main control module 10 is equipped with at least one DP interface (e.g., ...). Figure 1 As shown in DP Port 1, the DP interface of the main control module 10 is connected to the device under test 11 (DuT) through one or more test channels. In some optional embodiments of this application, the main control module 10 may also be configured with multiple DP interfaces, which can simultaneously connect to multiple devices under test 11 (DuTs). During audio testing, the main control module 10 acts as the source of the test, and optionally includes an automated test application. The automated test application can generate and output corresponding test DP audio signals according to different devices under test 11 and test requirements. The automated test application can be a mature software development kit or conformance test program in the prior art, and is not further limited here.

[0029] The device under test (DUT) 11 is the object of the audio test, serving as the receiver. DUT 11 also has at least one interface under test (IUT) capable of receiving DP signals (e.g., ...). Figure 1As shown in DP port 2, the device under test (DUT) 11 is connected to the main control module 10, and the DUT 11 is equipped with a codec. The DUT 11 is configured to receive the test DP audio signal generated and output by the main control module 10, which serves as the source of the test. The codec in the DUT 11 decodes the received test DP audio signal. The test DP audio signal decoded by the codec is output to the outside through the output interface 12.

[0030] In the embodiments of this invention, the main control module 10 also serves as a device for receiving and analyzing test results. Specifically, the audio processing module 13 is connected to the output interface 12, and the audio processing module 13 is preferably implemented by a sound card chip or an audio analysis device with an integrated sound card. The audio processing module 13 is configured to receive the decoded test DP audio signal output from the output interface 12, parse the received decoded test DP audio signal, and transmit the parsed test DP audio signal back to the main control module 10 to form a complete test transmission link. The main control module 10 compares the output test DP audio signal with the received parsed test DP signal to determine whether the audio signal transmitted through the test transmission link meets the requirements for high-speed signal transmission. The judgment and analysis can be implemented by an automated test application.

[0031] The audio testing system 1 based on DP signals provided by this invention provides a test DP audio signal through the main control module 10, and transmits the complete signal to the device under test 11 to simulate a real audio signal. The audio signal received by the device under test 11 is fed back to the main control module 10 for signal analysis through the output interface 12 and the audio processing module 13. This realizes the conversion of DP signal from electrical signal to acoustic signal to electrical signal, and realizes the complete link test of DP signal from transmission to reception in the system, that is, the integrity and stability of DP signal during transmission are detected.

[0032] like Figure 2As shown, considering the potential attenuation of audio signals during transmission, to ensure the integrity of the audio signal, in some optional embodiments of this application, the audio test system 1 further includes a signal conditioning module 15. The signal conditioning module 15 is implemented using a display port re-timer chip, such as the DP159 display port re-timer chip manufactured and sold by Texas Instruments, or other display port re-timer chips that can perform the same function. The input terminal of the signal conditioning module 15 is electrically connected to the main control module 10, and the output terminal is electrically connected to the device under test 11. The signal conditioning module 15 is configured to perform relay processing on the test DP audio signal generated and output by the main control module 10, and output the processed test DP audio signal to the device under test 11. The relay processing of the test DP audio signal by the signal conditioning module 15 can compensate for the attenuation of the DP audio signal, thereby transmitting the complete signal to the device under test 11 to simulate a real audio signal.

[0033] To meet the requirements of continuous testing, in some optional embodiments of this application, the audio test system based on DP signal further includes a UPS power supply module 16, which supplies power to the main control module 10, the signal conditioning module 15 and the audio processing module 13 respectively.

[0034] Regarding anti-interference design, in some optional embodiments of this application, different grounding methods are used to shield interference. In the power ground section, the power circuits of the main control module 10, signal conditioning module 15, and audio processing module 13 are respectively connected to the grounding terminal of the UPS power module 16 (e.g., Figure 3 As shown in the UPS GND diagram, the UPS power module 16, the host computer (which acts as the main control module 10), the display port re-timer chip (which acts as the signal conditioning module 15), and the sound card chip (which acts as the audio processing module 13) all share the same ground terminal of the UPS power module 16. In the signal ground section, the signal loops of the signal conditioning module 15, the audio processing module, and the output interface 12 are connected to the ground terminal of the device under test 11. The display port re-timer chip (which acts as the signal conditioning module 15), the sound card chip (which acts as the audio processing module 13), the device under test 11, and the output interface 12 all share the same ground terminal of the device under test 11 (e.g., the ground terminal of the UPS GND diagram). Figure 3 As shown in the diagram of DUT GND.

[0035] The UPS power module 16 supplies power to the signal conditioning module 15 via a matching AC adapter module 17. One end of the AC adapter module 17 is connected to the UPS power module 16, and the other end is connected to the signal conditioning module 15. The UPS power module 16 supplies power to the signal conditioning module 15 through the AC adapter module 17. Also for interference prevention, the power circuit of the AC adapter module 17 is connected to the grounding terminal of the UPS power module 16.

[0036] In some alternative embodiments of this application, differential signals are used for communication to achieve anti-interference effect. Specifically, during audio signal transmission, differential communication is used between the device under test 11 and the output interface 12, and differential communication is also used between the output interface 12 and the audio processing module 13.

[0037] In some optional embodiments of this application, the output interface 12 adopts an analog headphone jack design. Specifically, as shown below... Figure 3 As shown, a first differential signal line 18 and a second differential signal line 19 are provided between the output interface 12 and the audio processing module 13. One end of the first differential signal line 18 is connected to the output interface 12, and the other end is connected to the audio processing module 13. The second differential signal line 19 is connected in parallel with the first differential signal line 18. A first resistor R1 is provided between the first differential signal line 18 and the ground terminal of the device under test 11, and a second resistor R2 is provided between the second differential signal line 19 and the ground terminal of the device under test 11. The resistance values ​​of the first resistor R1 and the second resistor R2 are the same. The output interface 12 is designed to simulate a headphone jack, making the testing process closer to the usage process of electronic devices. This ensures that the decoded test DP audio signal received by the audio processing module 13 is consistent with the real scene, ensuring the integrity and stability of the test transmission link.

[0038] In some optional embodiments of this application, the resistance values ​​of the first resistor R1 and the second resistor R2 may optionally be designed to be 8Ω.

[0039] In some alternative embodiments of this application, the resistance values ​​of the first resistor R1 and the second resistor R2 may optionally be designed to be 16Ω.

[0040] In some alternative embodiments of this application, the resistance values ​​of the first resistor R1 and the second resistor R2 may optionally be designed to be 32Ω.

[0041] Reference Figure 3This paper describes the working principle of the DP signal-based audio testing system 1 provided in this application. In the power connection section, the UPS power module 16 is electrically connected to the AC adapter module 17, the host computer (PC) serving as the main control module 10, and the audio analysis device (Audio Analysis Device) with an integrated sound card chip serving as the audio processing module 13. The AC adapter module 17 is electrically connected to the display port re-timer chip (Power & Signal Delivery Board) serving as the signal conditioning module 15. In the communication connection section, one end of the display port re-timer chip serving as the signal conditioning module 15 is connected to the host computer (PC) serving as the main control module 10 via a DP cable, and the other end is connected to the electronic device under test 11 via a high-speed cable (or DP cable). The audio analysis device serving as the audio processing module 13 is connected to both the host computer (PC) serving as the main control module 10 and the output interface 12. The output interface 12 is connected to the electronic device under test 11.

[0042] The AC adapter module 17, the host computer (as the main control module 10), and the audio analysis device (as the audio processing module 13) are directly powered by the UPS power module 16. The display port re-timer chip (as the signal conditioning module 15) is indirectly powered by the AC adapter module 17. After the circuit connection is completed, the device is powered on. The host computer (as the main control module 10) simulates a sine wave audio signal and outputs the corresponding test DP audio signal in the form of a DP interface signal. The display port re-timer chip (as the signal conditioning module 15) compensates for the attenuation of the DP audio signal during transmission and transmits the DP audio signal completely to the device under test 11 for decoding. The device under test 11 is connected to the output interface 12 and outputs the decoded test DP audio signal through the output interface 12. The audio processing module 13, connected to the output interface 12, receives the decoded test DP audio signal, analyzes the decoded test audio signal, and re-analyzes it into a sine wave form. Then, the analyzed test DP audio signal is transmitted to the host computer (as the main control module 10) for signal analysis, thereby achieving complete and stable transmission of the DP audio signal in the high-speed transmission link.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims

1. An audio testing system based on DP signals, characterized in that, include: The main control module is configured to generate and output test DP audio signals; The device under test (DUT) has at least one interface capable of receiving DP signals, and the DUT is configured to receive and decode the test DP audio signal. An output interface, configured to output the decoded test DP audio signal to the outside; An audio processing module is connected to the output interface. The audio processing module is configured to receive and parse the decoded test DP audio signal, and transmit the parsed test DP audio signal to the main control module to form a test transmission link. A signal conditioning module, wherein the input terminal of the signal conditioning module is electrically connected to the main control module, and the output terminal is electrically connected to the device under test (DUT). The signal conditioning module is configured to perform relay processing on the test DP audio signal generated and output by the main control module, and output the processed test DP audio signal to the DUT; wherein the signal conditioning module is implemented by a display port re-timer chip; and The UPS power supply module provides power to the main control module, the signal conditioning module, and the audio processing module respectively. The power circuits of the main control module, signal conditioning module, and audio processing module are connected to the grounding terminal of the UPS power module. The signal circuits of the signal conditioning module, the audio processing module, and the output interface are connected to the grounding terminal of the device under test.

2. The audio testing system based on DP signals according to claim 1, characterized in that, Differential communication is used between the device under test and the output interface, and differential communication is used between the output interface and the audio processing module.

3. The audio testing system based on DP signals according to claim 2, characterized in that, The output interface and the audio processing module are provided with the following: The first differential signal line has one end connected to the output interface and the other end connected to the audio processing module. The second differential signal line is connected in parallel with the first differential signal line; A first resistor is provided between the first differential signal line and the ground terminal of the device under test, and a second resistor is provided between the second differential signal line and the ground terminal of the device under test; the resistance values ​​of the first resistor and the second resistor are the same.

4. The audio testing system based on DP signals according to claim 3, characterized in that, The resistance values ​​of the first resistor and the second resistor are 8Ω, 16Ω, or 32Ω.

5. The audio testing system based on DP signals according to claim 1, characterized in that, The audio testing system also includes: An AC adapter module is connected at one end to the UPS power module and at the other end to the signal conditioning module. The UPS power module supplies power to the signal conditioning module through the AC adapter module.

6. The audio testing system based on DP signals according to claim 5, characterized in that, The power circuit of the AC adapter module is connected to the grounding terminal of the UPS power module.

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