Crosstalk detection device and test method for audio patch cord
By using standard resistors to simulate audio load and customized audio modules, combined with the coordinated work of multiple modules, the problem of high cost and poor accuracy of crosstalk detection in the prior art is solved, and low-cost and high-accuracy crosstalk detection is achieved , suitable for mass production.
Patent Information
- Application Number
- CN202411311118.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-01-07
AI Technical Summary
The prior art has problems such as high cost, large volume, inconvenient integration and inaccurate calculation of crosstalk in the prior art, which is difficult to meet the needs of low cost, small size and high integration.
Using multiple standard resistors to simulate audio loads, crosstalk is calculated through segmented measurements, and customized audio modules are used to replace standard instruments. Combined with upper computers, control modules, signal adapter modules, power modules and USB-C adapter modules to achieve low cost , high-accuracy crosstalk detection.
It effectively reduces the testing cost, ensures the testing accuracy, and is compact in the equipment, easy to install and integrate, and is suitable for mass production.
Smart Images
Figure CN119270143A_ABST
Abstract
Description
Technical Field
[0001] The present invention is applied to the technical field of fast testing of finished product functions, and in particular relates to a crosstalk detection device and a testing method for an audio adapter cable. Background Art
[0002] With the advancement of technology, mobile phones and digital products have gradually cancelled the 3.5mm audio interface. Manufacturers have instead launched their own TWS true wireless headphones or headphones with Type-C interfaces. There are relatively few Type-C to 3.5mm adapters included with the products, which is not very friendly to some consumers who are not very accepting of wireless headphones and pursue the sound quality of wired headphones. With the gradual popularization of the C port, Type-C to 3.5mm audio conversion cables will become a popular category like TWS headphones, and the corresponding testing needs for this module are also increasing.
[0003] Crosstalk refers to the situation that when the sound source is played on a certain channel, the audio signal transmitted on the channel will be coupled to the path of another channel. For example, when the sound source is played on the left channel, the audio signal transmitted on the left channel will be coupled to the path of the right channel, resulting in strong crosstalk in the right channel. Since crosstalk will affect the sound playback effect, how to accurately test the crosstalk and ensure the product qualification rate and factory consistency has become an urgent problem to be solved. However, the existing special tooling has the disadvantages of large size and high cost. If standard instruments are used for testing, not only is the test cost high, but it is also not convenient to integrate into customized equipment, and the accuracy of the calculated values cannot be guaranteed. Therefore, it is necessary to provide a crosstalk detection device and detection method for audio adapter cables that is low in cost, small in size, and highly integrated, easy to install and integrate on the test board, easy to mass produce, and has a more reasonable calculation method. Summary of the invention
[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a crosstalk detection device and detection method for an audio adapter cable with low cost, small size, high integration, easy installation and integration on a test board, easy mass production, and more reasonable calculation method.
[0005] The technical solution adopted by the present invention is: the present invention includes a host computer, a control module, a signal adapter module, a power module, an audio module, a USB-C adapter module and a product to be tested, the product to be tested is connected to the USB-C port of the host computer via the USB-C adapter module and the signal adapter module in sequence, the RJ45 port of the control module is connected to the corresponding port of the host computer, the UART port of the power module is connected to the corresponding port of the control module, the VBUS port of the power module is connected to the corresponding port of the USB-C adapter module, and the input end of the audio module is divided into two paths, one path is grounded through a load, and the other path is connected to or disconnected from the audio output end of the product to be tested.
[0006] It can be seen from the above scheme that the present application utilizes multiple standard resistors to simulate audio loads, utilizes segmented measurement to calculate crosstalk, and utilizes customized audio modules to replace standard instruments, thereby effectively reducing testing costs while ensuring test accuracy. It has the advantages of low cost, small size, high integration, and easy installation and integration.
[0007] In a preferred embodiment, the testing method includes testing the noise floor of the audio module in a silent state, and the testing steps are as follows: Step 1: The power module cuts off the power to the product under test; Step 2: disconnecting the input end of the audio module from the audio output end of the product to be tested; Step 3, the input end of the audio module is grounded via a load, and the resistance of the load is 0R; Step 4: The input end of the audio module reads back the noise floor and records the test result as V0.
[0008] A preferred solution is that the test method further comprises testing the noise floor of the audio module and the noise floor of the left channel of the product to be tested in a silent state, the steps being as follows: Step 5: The product to be tested is connected to the host computer; Step 6, the control module controls the output of the power module through the UART port, and the power module supplies power to the product; Step 7: Setting the product to be tested to enter audio output mode; Step 8, setting the input end of the audio module to be connected to the left channel of the product to be tested; Step 9, the left channel of the audio output end of the product to be tested is grounded via a load, and the resistance of the load is 0R; Step 10: The input end of the audio module reads back the noise floor and records the test result as V1_L.
[0009] A preferred solution is that the test method further comprises testing the noise floor of the audio module and the noise floor of the right channel of the product to be tested in a silent state, the steps being as follows: Step 11, the product to be tested is connected to the host computer; Step 12, the control module controls the output of the power module through the UART port, and the power module supplies power to the product; Step 13, setting the product to be tested to enter audio output mode; Step 14, setting the input end of the audio module to be connected to the right channel of the audio output end of the product to be tested, and leaving the left channel of the product to be tested unconnected; Step 15, the right channel of the audio output end of the product to be tested is grounded via a load, and the resistance of the load is 0R; Step 16: The input end of the audio module reads back the noise floor and records the test result as V1_R.
[0010] In a preferred embodiment, the test method further comprises testing the noise floor of the audio module and the noise floor of the left channel of the product to be tested in a broadcasting state, the steps being as follows: Step 17, the product to be tested is connected to the host computer; Step 18, the control module controls the output of the power module through the UART port, and the power module supplies power to the product; Step 19, setting the product to be tested to enter audio output mode; Step 20, the left channel of the product to be tested is grounded via a load, and the resistance of the load is 0R; Step 21, the right channel of the product to be tested is grounded via a load, and the resistance of the load is 30R; Step 22, setting the host computer broadcast output an audio signal to the right channel of the product under test; Step 23, setting the input end of the audio module to be connected to the left channel of the product to be tested; Step 24, the input end of the audio module reads back the noise floor and records the test result as V2_L; Step 25, setting the input end of the audio module to be connected to the right channel of the product to be tested; Step 26: The input end of the audio module reads back the noise floor and records the test result as V2_R.
[0011] In a preferred embodiment, the test method further comprises testing the noise floor of the audio module and the noise floor of the right channel of the product to be tested in a broadcasting state, the steps being as follows: Step 27, the product to be tested is connected to the host computer; Step 28, the control module controls the output of the power module through the UART port, and the power module supplies power to the product; Step 29, setting the product to be tested to enter audio output mode; Step 30, the right channel of the product to be tested is grounded via a load, and the resistance of the load is 0R; Step 31, the left channel of the product to be tested is grounded via a load, and the resistance of the load is 30R; Step 32, setting the host computer broadcast output an audio signal to the left channel of the product under test; Step 33, setting the input end of the audio module to be connected to the right channel of the product to be tested; Step 34, the input end of the audio module reads back the noise floor and records the test result as V3_R; Step 35, setting the input end of the audio module to be connected to the left channel of the product to be tested; Step 36: The input end of the audio module reads back the noise floor and records the test result as V3_L.
[0012] A preferred solution is that the crosstalk calculation method is as follows: Step 37: Calculate the noise floor of the left channel of the product under test in a silent state; V4_L= SQRT(V1_L^2-V0^2) Step 38: Calculate the noise floor of the right channel of the product under test in a silent state; V4_R = SQRT(V1_R^2-V0^2) Step 39: Calculate the noise floor of the left channel of the product under test in the right channel broadcasting state; V5_L=SQRT(V2_L^2-V4_L^2) Step 40: Calculate the noise floor of the right channel of the product under test in the right channel broadcasting state; V5_R=SQRT(V2_R^2-V4_R^2) Step 41, in the left channel broadcasting state, calculating the noise floor of the right channel of the product to be tested; V6_R=SQRT(V3_R^2-V4_R^2) Step 42: Calculate the noise floor of the left channel of the product under test in the left channel broadcasting state; V6_L=SQRT(V3_L^2-V4_L^2) Step 43, calculating the crosstalk of the left channel of the product to be tested: Crosstalk_L=20*LOG10(V5_L / V5_R) Step 44, calculating the crosstalk of the right channel of the product to be tested: Crosstalk_R=20*LOG10(V6_R / V6_L). BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is a system block diagram of the present invention; Figure 2 is a test diagram of the audio module in a muted state; Figure 3 It is a test diagram for testing the noise floor of the audio module and the noise floor of the left channel of the product to be tested in a silent state; Figure 4 It is a test diagram for testing the noise floor of the audio module and the noise floor of the right channel of the product to be tested in a silent state; Figure 5 A first test diagram for testing the noise floor of the audio module and the noise floor of the left channel of the product under test in a broadcasting state; Figure 6 A second test diagram for testing the noise floor of the audio module and the noise floor of the right channel of the product under test in a broadcasting state; Figure 7 A first test diagram for testing the noise floor of the audio module and the noise floor of the left channel of the product under test in a broadcasting state; Figure 8 It is a second test diagram for testing the noise floor of the audio module and the noise floor of the right channel of the product to be tested in the broadcasting state. DETAILED DESCRIPTION
[0014] like Figure 1 As shown, in this embodiment, the present invention includes a host computer 1, a control module 2, a signal adapter module 3, a power module 4, an audio module 5, a USB-C adapter module 6 and a product to be tested 7. The product to be tested 7 is connected to the USB-C port of the host computer 1 via the USB-C adapter module 6 and the signal adapter module 3 in sequence. The RJ45 port of the control module 2 is connected to the corresponding port of the host computer 1, the UART port of the power module 4 is connected to the corresponding port of the control module 2, the VBUS port of the power module 4 is connected to the corresponding port of the USB-C adapter module 6, and the input end of the audio module 5 is divided into two paths, one path is grounded through the load, and the other path is connected to or disconnected from the audio output end of the product to be tested 7.
[0015] The host computer 1 is used to run the test program; the control module 2 exchanges information with the host computer 1, controls the output of the power module 4 through UART, and controls the output and input of the audio module 5 through I2S; the power module 4 is a programmable voltage output 0-10V, which supplies power to the product under test 7; the output end of the audio module 5 can simulate the output of an audio signal, and the input end of the audio module 5 can simulate the measurement of an audio signal; the signal adapter module 3 is used to transfer the audio module signal, transfer the USB C signal, and transfer the power signal; the USB-C adapter module 6 is used for Type C signal transfer of the product under test 7.
[0016] like Figure 2 As shown, in this embodiment, the testing method includes testing the noise floor of the audio module 5 in a silent state, and the testing steps are as follows: Step 1, the power module 4 cuts off the power to the product under test 7; Step 2: The input end of the audio module 5 is disconnected from the audio output end of the product to be tested 7; Step 3, the input end of the audio module 5 is grounded via a load, and the resistance of the load is 0R; Step 4: The input end of the audio module 5 reads back the noise floor and records the test result as V0.
[0017] like Figure 3 As shown, in this embodiment, the test method further includes testing the noise floor of the audio module 5 and the noise floor of the left channel of the product to be tested 7 in a silent state, and the test steps are as follows: Step 5, the product to be tested 7 is connected to the host computer 1; Step 6, the control module 2 controls the output of the power module 4 through the UART port, and the power module 4 supplies power to the product; Step 7, setting the product under test 7 to enter audio output mode; Step 8, setting the input end of the audio module 5 to be connected to the left channel of the product to be tested 7; Step 9, the left channel of the audio output end of the product to be tested 7 is grounded via a load, and the resistance of the load is 0R; Step 10: The input end of the audio module 5 reads back the noise floor and records the test result as V1_L.
[0018] like Figure 4 As shown, in this embodiment, the test method further includes testing the noise floor of the audio module 5 and the noise floor of the right channel of the product to be tested 7 in a silent state, and the test steps are as follows: Step 11, the product to be tested 7 is connected to the host computer 1; Step 12, the control module 2 controls the output of the power module 4 through the UART port, and the power module 4 supplies power to the product; Step 13, setting the product under test 7 to enter audio output mode; Step 14, setting the input end of the audio module 5 to be connected to the right channel of the audio output end of the product under test 7, and leaving the left channel of the product under test 7 unconnected; Step 15, the right channel of the audio output terminal of the product to be tested 7 is grounded via a load, and the resistance of the load is 0R; Step 16: The input end of the audio module 5 reads back the noise floor and records the test result as V1_R.
[0019] like Figure 5 and Figure 6 As shown, in this embodiment, the test method further includes testing the noise floor of the audio module 5 and the noise floor of the left channel of the product to be tested 7 in the broadcasting state, and the test steps are as follows: Step 17, the product to be tested 7 is connected to the host computer 1; Step 18, the control module 2 controls the output of the power module 4 through the UART port, and the power module 4 supplies power to the product; Step 19, setting the product under test 7 to enter audio output mode; Step 20, the left channel of the product to be tested 7 is grounded via a load, and the resistance of the load is 0R; Step 21, the right channel of the product to be tested 7 is grounded via a load, and the resistance of the load is 30R; Step 22, setting the host computer 1 broadcast output an audio signal to the right channel of the product under test 7; Step 23, setting the input end of the audio module 5 to be connected to the left channel of the product to be tested 7; Step 24, the input end of the audio module 5 reads back the noise floor and records the test result as V2_L; Step 25, setting the input end of the audio module 5 to be connected to the right channel of the product to be tested 7; Step 26: The input end of the audio module 5 reads back the noise floor and records the test result as V2_R.
[0020] like Figure 7 and Figure 8 As shown, in this embodiment, the test method further includes testing the noise floor of the audio module 5 and the noise floor of the right channel of the product to be tested 7 in the broadcasting state, and the test steps are as follows: Step 27, the product to be tested 7 is connected to the host computer 1; Step 28, the control module 2 controls the output of the power module 4 through the UART port, and the power module 4 supplies power to the product; Step 29, setting the product under test 7 to enter audio output mode; Step 30, the right channel of the product to be tested 7 is grounded via a load, and the resistance of the load is 0R; Step 31, the left channel of the product to be tested 7 is grounded via a load, and the resistance of the load is 30R; Step 32, setting the host computer 1 broadcast output an audio signal to the left channel of the product under test 7; Step 33, setting the input end of the audio module 5 to be connected to the right channel of the product to be tested 7; Step 34, the input end of the audio module 5 reads back the noise floor and records the test result as V3_R; Step 35, setting the input end of the audio module 5 to be connected to the left channel of the product to be tested 7; Step 36: The input end of the audio module 5 reads back the noise floor and records the test result as V3_L.
[0021] In this embodiment, the steps for calculating the crosstalk are as follows: Step 37, in a silent state, calculating the noise floor of the left channel of the product to be tested 7; V4_L= SQRT(V1_L^2-V0^2) Step 38, calculating the noise floor of the right channel of the product under test 7 in a silent state; V4_R = SQRT(V1_R^2-V0^2) Step 39, in the right channel broadcasting state, calculating the noise floor of the left channel of the product under test 7; V5_L=SQRT(V2_L^2-V4_L^2) Step 40, in the right channel broadcasting state, calculating the noise floor of the right channel of the product to be tested 7; V5_R=SQRT(V2_R^2-V4_R^2) Step 41, in the left channel broadcasting state, calculating the noise floor of the right channel of the product under test 7; V6_R=SQRT(V3_R^2-V4_R^2) Step 42, in the left channel broadcasting state, calculating the noise floor of the left channel of the product to be tested 7; V6_L=SQRT(V3_L^2-V4_L^2) Step 43, the crosstalk calculation of the left channel of the product to be tested 7: Crosstalk_L=20*LOG10(V5_L / V5_R) Step 44, the crosstalk calculation of the right channel of the product to be tested 7: Crosstalk_R=20*LOG10(V6_R / V6_L).
[0022] Among them, the noise floor refers to the minimum signal strength that the receiver can perceive when the received signal-to-noise ratio is 0dB; crosstalk refers to the coupling between two signal lines, and the mutual inductance and mutual capacitance between the signal lines cause noise on the lines; SQRT is the square root calculation; ^ is the square power; LOG is the logarithmic function.
[0023] Although the embodiments of the present invention are described with practical solutions, they do not constitute limitations on the meaning of the present invention. For those skilled in the art, it is obvious to modify the implementation scheme and combine it with other solutions based on this description.
Claims
1. A crosstalk detection device for an audio adapter cable, characterized in that: It comprises a host computer (1), a control module (2), a signal transfer module (3), a power module (4), an audio module (5), a USB-C transfer module (6) and a product to be tested (7), wherein the product to be tested (7) is connected to a USB-C port of the host computer (1) via the USB-C transfer module (6) and the signal transfer module (3) in sequence, an RJ45 port of the control module (2) is connected to a corresponding port of the host computer (1), a UART port of the power module (4) is connected to a corresponding port of the control module (2), a VBUS port of the power module (4) is connected to a corresponding port of the USB-C transfer module (6), and an input end of the audio module (5) is divided into two paths, one path is grounded via a load, and the other path is connected to or disconnected from an audio output end of the product to be tested (7).
2. A method for testing the crosstalk detection device of the audio adapter cable as claimed in claim 1, characterized in that: The testing method comprises testing the noise floor of the audio module (5) in a silent state, and the testing steps are as follows: Step 1: The power module (4) cuts off power to the product to be tested (7); Step 2: disconnecting the input end of the audio module (5) from the audio output end of the product to be tested (7); Step 3, the input end of the audio module (5) is grounded via a load, and the resistance of the load is 0R; Step 4: The input end of the audio module (5) reads back the noise floor and records the test result as V0.
3. A testing method according to claim 2, characterized in that: The test method further comprises testing the noise floor of the audio module (5) and the noise floor of the left channel of the product to be tested (7) in a silent state, the test steps being as follows: Step 5: the product to be tested (7) is connected to the host computer (1); Step 6: The control module (2) controls the output of the power module (4) through the UART port, and the power module (4) supplies power to the product; Step 7, setting the product to be tested (7) to enter audio output mode; Step 8, setting the input end of the audio module (5) to be connected to the left channel of the product to be tested (7); Step 9, the left channel of the audio output end of the product to be tested (7) is grounded via a load, and the resistance of the load is 0R; Step 10: The input end of the audio module (5) reads back the noise floor and records the test result as V1_L.
4. A testing method according to claim 3, characterized in that: The test method further comprises testing the noise floor of the audio module (5) and the noise floor of the right channel of the product to be tested (7) in a silent state, the test steps being as follows: Step 11, the product to be tested (7) is connected to the host computer (1); Step 12: the control module (2) controls the output of the power module (4) through the UART port, and the power module (4) supplies power to the product; Step 13, setting the product to be tested (7) to enter audio output mode; Step 14, setting the input end of the audio module (5) to be connected to the right channel of the audio output end of the product to be tested (7), and leaving the left channel of the product to be tested (7) unconnected; Step 15, the right channel of the audio output end of the product to be tested (7) is grounded via a load, and the resistance of the load is 0R; Step 16: The input end of the audio module (5) reads back the noise floor and records the test result as V1_R.
5. A testing method according to claim 4, characterized in that: The test method further comprises testing the noise floor of the audio module (5) and the noise floor of the left channel of the product to be tested (7) in a broadcasting state, the test steps being as follows: Step 17, the product to be tested (7) is connected to the host computer (1); Step 18, the control module (2) controls the output of the power module (4) through the UART port, and the power module (4) supplies power to the product; Step 19, setting the product to be tested (7) to enter audio output mode; Step 20, the left channel of the product to be tested (7) is grounded via a load, and the resistance of the load is 0R; Step 21, the right channel of the product to be tested (7) is grounded via a load, and the resistance of the load is 30R; Step 22, setting the host computer (1) to broadcast and output an audio signal to the right channel of the product under test (7); Step 23, setting the input end of the audio module (5) to be connected to the left channel of the product to be tested (7); Step 24, the input end of the audio module (5) reads back the noise floor and records the test result as V2_L; Step 25, setting the input end of the audio module (5) to be connected to the right channel of the product to be tested (7); Step 26: The input end of the audio module (5) reads back the noise floor and records the test result as V2_R.
6. A testing method according to claim 5, characterized in that: The test method further comprises testing the noise floor of the audio module (5) and the noise floor of the right channel of the product to be tested (7) in a broadcasting state, the test steps being as follows: Step 27, the product to be tested (7) is connected to the host computer (1); Step 28, the control module (2) controls the output of the power module (4) through the UART port, and the power module (4) supplies power to the product; Step 29, setting the product to be tested (7) to enter audio output mode; Step 30, the right channel of the product to be tested (7) is grounded via a load, and the resistance of the load is 0R; Step 31, the left channel of the product to be tested (7) is grounded via a load, and the resistance of the load is 30R; Step 32, setting the host computer (1) to broadcast and output an audio signal to the left channel of the product under test (7); Step 33, setting the input end of the audio module (5) to be connected to the right channel of the product to be tested (7); Step 34, the input end of the audio module (5) reads back the noise floor and records the test result as V3_R; Step 35, setting the input end of the audio module (5) to be connected to the left channel of the product to be tested (7); Step 36: The input end of the audio module (5) reads back the noise floor and records the test result as V3_L.
7. A testing method according to claim 6, characterized in that: The steps to calculate crosstalk are as follows: Step 37, in a silent state, calculating the noise floor of the left channel of the product to be tested (7); V4_L= SQRT(V1_L^2-V0^2) Step 38, calculating the noise floor of the right channel of the product to be tested (7) in a silent state; V4_R = SQRT(V1_R^2-V0^2) Step 39, in the right channel broadcasting state, calculating the noise floor of the left channel of the product to be tested (7); V5_L=SQRT(V2_L^2-V4_L^2) Step 40, in the right channel broadcasting state, calculating the noise floor of the right channel of the product to be tested (7); V5_R=SQRT(V2_R^2-V4_R^2) Step 41, in the left channel broadcasting state, calculating the noise floor of the right channel of the product to be tested (7); V6_R=SQRT(V3_R^2-V4_R^2) Step 42, in the left channel broadcasting state, calculating the noise floor of the left channel of the product to be tested (7); V6_L=SQRT(V3_L^2-V4_L^2) Step 43, calculating the crosstalk of the left channel of the product to be tested (7): Crosstalk_L=20*LOG10(V5_L / V5_R) Step 44, calculate the crosstalk of the right channel of the product to be tested (7): Crosstalk_R=20*LOG10(V6_R / V6_L).