Audio testing device and system

Abstract

This application discloses an audio testing device and system, belonging to the field of testing technology. The audio testing device includes: a main control module, including a first output terminal, a second output terminal, a first input terminal, and a second input terminal; a buffer module, whose input terminal is electrically connected to the first and second output terminals; a coupling module, whose input terminal is electrically connected to the output terminal of the buffer module, and whose output terminal is connected to the M / G and G / M terminals of the headphone jack under test via a headphone adapter cable; and a filtering module, whose input terminal is connected to the left and right channel terminals of the headphone jack under test via a headphone adapter cable, and whose output terminal is electrically connected to the first and second input terminals; a first loop is formed between the first output terminal and the first input terminal, and a second loop is formed between the second output terminal and the second input terminal. The first loop is used to test headphone jacks using the CTIA standard, and the second loop is used to test headphone jacks using the OMTP standard. This application can achieve dual-mode compatibility testing.

Description

Technical Field

[0001] This application relates to the field of testing technology, and in particular to audio testing apparatus and systems. Background Technology

[0002] Currently, the conventional production testing scheme for headphone interfaces in related technologies is manual testing. This testing scheme is highly dependent on manual operation, resulting in low testing efficiency, poor testing consistency, and the risk of human error and missed detection. Furthermore, this testing scheme is incompatible with the physical pin conflicts (MIC and GND pin positions are interchanged) of the CTIA (international standard) and OMTP (national standard) protocols. Utility Model Content

[0003] The main purpose of this application is to provide an audio testing device and system, which aims to solve the technical problem of how to automate the testing of headphone interfaces that adopt international and national standards.

[0004] To achieve the above objectives, this application provides an audio testing apparatus, the audio testing apparatus comprising:

[0005] The main control module includes a first output terminal, a second output terminal, a first input terminal, and a second input terminal;

[0006] A buffer module, wherein the input terminal of the buffer module is electrically connected to the first output terminal and the second output terminal;

[0007] A coupling module, wherein the input terminal of the coupling module is electrically connected to the output terminal of the buffer module, and the output terminal of the coupling module is connected to the M / G terminal and G / M terminal of the headphone interface under test via a headphone adapter cable;

[0008] A filtering module, wherein the input end of the filtering module is connected to the left and right channels of the headphone interface under test via the headphone adapter cable, and the output end of the filtering module is electrically connected to the first input end and the second input end;

[0009] A first circuit is formed between the first output terminal and the first input terminal, and a second circuit is formed between the second output terminal and the second input terminal. The first circuit is used to test headphone jacks using the CTIA standard, and the second circuit is used to test headphone jacks using the OMTP standard.

[0010] In one embodiment, the main control module includes:

[0011] A digital-to-analog converter unit, wherein the digital-to-analog converter unit is electrically connected to the first output terminal and the second output terminal respectively;

[0012] An analog-to-digital conversion unit, wherein the analog-to-digital conversion unit is electrically connected to the first input terminal and the second input terminal respectively;

[0013] The processing unit is electrically connected to both the digital-to-analog converter and the analog-to-digital converter.

[0014] In one embodiment, the buffer module includes a first buffer unit and a second buffer unit, the coupling module includes a first coupling unit and a second coupling unit, and the filtering module includes a first filtering unit and a second filtering unit;

[0015] The input terminal of the first buffer unit is electrically connected to the first output terminal, the output terminal of the first buffer unit is electrically connected to the input terminal of the first coupling unit, the output terminal of the first coupling unit is connected to the M / G terminal through the headphone adapter cable, the input terminal of the first filter unit is connected to the right channel terminal through the headphone adapter cable, and the output terminal of the first filter unit is electrically connected to the first input terminal.

[0016] The input terminal of the second buffer unit is electrically connected to the second output terminal, the output terminal of the second buffer unit is electrically connected to the input terminal of the second coupling unit, the output terminal of the second coupling unit is connected to the G / M terminal through the headphone adapter cable, the input terminal of the second filter unit is connected to the left channel terminal through the headphone adapter cable, and the output terminal of the second filter unit is electrically connected to the second input terminal.

[0017] In one embodiment, the first buffer unit includes:

[0018] A first resistor, wherein a first end of the first resistor is electrically connected to the first output terminal;

[0019] The second resistor has its first end electrically connected to the second end of the first resistor, and its second end grounded.

[0020] The first operational amplifier has its positive input terminal electrically connected to the first terminal of the second resistor, and its negative input terminal and output terminal electrically connected.

[0021] The third resistor, the first end of which is electrically connected to the output terminal of the first operational amplifier;

[0022] A fourth resistor, wherein the first end of the fourth resistor is electrically connected to the first end of the first resistor, and the second end of the fourth resistor is electrically connected to the second end of the third resistor;

[0023] The fifth resistor has its first end electrically connected to the second end of the fourth resistor, and its second end electrically connected to the input end of the first coupling unit.

[0024] The sixth resistor is connected in parallel with the fifth resistor;

[0025] A first capacitor, the first terminal of which is electrically connected to the second terminal of the fifth resistor, and the second terminal of which is grounded.

[0026] In one embodiment, the second buffer unit includes:

[0027] The seventh resistor, wherein the first end of the seventh resistor is electrically connected to the second output terminal;

[0028] The eighth resistor has its first end electrically connected to the second end of the seventh resistor, and its second end is grounded.

[0029] The second operational amplifier has its positive input terminal electrically connected to the first terminal of the eighth resistor, and its negative input terminal and output terminal are electrically connected.

[0030] The ninth resistor, the first end of which is electrically connected to the output terminal of the second operational amplifier;

[0031] The tenth resistor has its first end electrically connected to the first end of the seventh resistor, and its second end electrically connected to the second end of the ninth resistor.

[0032] The eleventh resistor has its first end electrically connected to the second end of the tenth resistor, and its second end electrically connected to the input end of the second coupling unit.

[0033] The twelfth resistor is connected in parallel with the eleventh resistor;

[0034] The second capacitor has its first terminal electrically connected to the second terminal of the eleventh resistor, and its second terminal grounded.

[0035] In one embodiment, the first coupling unit includes:

[0036] The third capacitor has its first end electrically connected to the output end of the first buffer unit, and its second end connected to the M / G terminal via the headphone adapter cable.

[0037] In one embodiment, the second coupling unit includes:

[0038] The fourth capacitor has its first end electrically connected to the output end of the second buffer unit, and its second end connected to the G / M terminal via the headphone adapter cable.

[0039] In one embodiment, the first filtering unit includes:

[0040] The fifth capacitor has its first end connected to the right channel end via the headphone adapter cable, and its second end electrically connected to the first input end.

[0041] The thirteenth resistor has its first end electrically connected to the second end of the fifth capacitor, and its second end electrically connected to the power supply.

[0042] In one embodiment, the second filtering unit includes:

[0043] The sixth capacitor has its first end connected to the left channel end via the headphone adapter cable, and its second end electrically connected to the second input end.

[0044] The fourteenth resistor has its first end electrically connected to the second end of the sixth capacitor, and its second end electrically connected to the power supply.

[0045] In addition, to achieve the above objectives, this application also provides an audio testing system, which includes a headphone jack under test and an audio testing device as described above, wherein the audio testing device is connected to the headphone jack under test via a headphone adapter cable.

[0046] This application proposes an audio testing device and system that overcomes the problem in related technologies where headphone jack testing schemes are incompatible with automated testing of headphone jacks using international and national standards. The audio testing device includes: a main control module, comprising a first output terminal, a second output terminal, a first input terminal, and a second input terminal; a buffer module, the input terminal of which is electrically connected to the first and second output terminals; a coupling module, the input terminal of which is electrically connected to the output terminal of the buffer module, and the output terminal of which is connected to the M / G and G / M terminals of the headphone jack under test via a headphone adapter cable; and a filtering module, the input terminal of which is connected to the left and right channels of the headphone jack under test via a headphone adapter cable, and the output terminal of which is electrically connected to the first and second input terminals; a first loop is formed between the first output terminal and the first input terminal, and a second loop is formed between the second output terminal and the second input terminal. The first loop is used to test headphone jacks using the CTIA standard, and the second loop is used to test headphone jacks using the OMTP standard. The audio testing device provided in this application can be used to test headphone jacks that adopt the CTIA international standard as well as headphone jacks that adopt the OMTP national standard. The test results can be analyzed by the main control module, making it suitable for automated testing scenarios. It avoids the risk of human error and missed detection, and improves testing efficiency. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the structure of an audio testing device provided in an embodiment of this application;

[0049] Figure 2 This is a schematic diagram of the main control module in an audio testing device provided in an embodiment of this application;

[0050] Figure 3 A detailed structural schematic diagram of an audio testing device provided in an embodiment of this application;

[0051] Figure 4 A schematic diagram of the circuit structure of the first buffer unit in an audio testing device provided in an embodiment of this application;

[0052] Figure 5 A schematic diagram of the circuit structure of the second buffer unit in an audio testing device provided in an embodiment of this application;

[0053] Figure 6 A schematic diagram of the circuit structure of the first coupling unit in an audio testing device provided in an embodiment of this application;

[0054] Figure 7 A schematic diagram of the circuit structure of the second coupling unit in an audio testing device provided in an embodiment of this application;

[0055] Figure 8 A schematic diagram of the circuit structure of the first filtering unit in an audio testing device provided in an embodiment of this application;

[0056] Figure 9 This is a schematic diagram of the circuit structure of the second filtering unit in an audio testing device provided in an embodiment of this application.

[0057] Explanation of icon numbers:

[0058] 10. Main control module; OUT1, first output terminal; OUT2, second output terminal; IN1, first input terminal; IN2, second input terminal; 20. Buffer module; 30. Coupling module; 40. Filtering module; L, left channel terminal; R, right channel terminal; 11. Digital-to-analog conversion unit; 12. Analog-to-digital conversion unit; 13. Processing unit; 21. First buffer unit; 22. Second buffer unit; 31. First coupling unit; 32. Second coupling unit; 41. First filtering unit; 42. Second filtering unit; R1~R14, first resistor~fourteenth resistor; C1~C6, first capacitor~sixth capacitor; U1, first operational amplifier; U2, second operational amplifier; VDD, power supply.

[0059] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0060] 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 a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0061] Currently, the conventional production testing scheme for headphone jacks in related technologies is manual testing. This testing scheme does not distinguish between CTIA (Cellular Telecommunications and Internet Association, referring to the international standard in this article) and OMTP (Open Mobile Terminal Platform, referring to the national standard in this article) modes. The general steps are as follows: 1) Connect the headphones to the headphone jack; 2) Input an audio signal to the headphone microphone through an external audio source; 3) Output the same audio signal to the left and right channels of the headphones; 4) Manually judge the quality of the output audio signal. This testing scheme is highly dependent on manual operation, resulting in low testing efficiency, poor test consistency, and the risk of human error and missed detections. Furthermore, the testing equipment used in this scheme is incompatible with testing headphone jacks using CTIA and those using OMTP because of physical pin conflicts (MIC and GND pin positions are interchanged).

[0062] Based on this, embodiments of this application provide an audio testing device and system. The audio testing device includes: a main control module, which includes a first output terminal, a second output terminal, a first input terminal, and a second input terminal; a buffer module, whose input terminal is electrically connected to the first and second output terminals; a coupling module, whose input terminal is electrically connected to the output terminal of the buffer module, and whose output terminal is connected to the M / G terminal and G / M terminal of the headphone jack under test via a headphone adapter cable; and a filtering module, whose input terminal is connected to the left and right channel terminals of the headphone jack under test via a headphone adapter cable, and whose output terminal is electrically connected to the first and second input terminals; a first loop is formed between the first output terminal and the first input terminal, and a second loop is formed between the second output terminal and the second input terminal. The first loop is used to test headphone jacks using the CTIA standard, and the second loop is used to test headphone jacks using the OMTP standard. The audio testing device provided in this application can be used to test headphone jacks that adopt the CTIA international standard as well as headphone jacks that adopt the OMTP national standard. The test results can be analyzed by the main control module, making it suitable for automated testing scenarios. It avoids the risk of human error and missed detection, and improves testing efficiency.

[0063] The audio testing device and system provided in this application are specifically described through the following embodiments, starting with the audio testing device.

[0064] This application provides an audio testing device, referring to... Figure 1 , Figure 1 This is a schematic diagram of an audio testing device provided in an embodiment of this application. The audio testing device includes:

[0065] The main control module 10 includes a first output terminal OUT1, a second output terminal OUT2, a first input terminal IN1, and a second input terminal IN2.

[0066] The buffer module 20 has its input terminal electrically connected to the first output terminal OUT1 and the second output terminal OUT2.

[0067] The input terminal of the coupling module 30 is electrically connected to the output terminal of the buffer module 20, and the output terminal of the coupling module 30 is connected to the M / G terminal and G / M terminal of the headphone interface under test through the headphone adapter cable.

[0068] The filter module 40 has its input terminals connected to the left channel L and right channel R of the headphone jack under test via a headphone adapter cable. The output terminal of the filter module 40 is electrically connected to the first input terminal IN1 and the second input terminal IN2.

[0069] A first circuit is formed between the first output terminal OUT1 and the first input terminal IN1, and a second circuit is formed between the second output terminal OUT2 and the second input terminal IN2. The first circuit is used to test headphone jacks using the CTIA standard, and the second circuit is used to test headphone jacks using the OMTP standard.

[0070] In this embodiment, the audio testing device has two test circuits, a first circuit and a second circuit, adapted to headphone interfaces using different standards. Therefore, the audio testing device can be used for testing scenarios using headphone interfaces with the CTIA standard as well as those using headphone interfaces with the OMTP standard. Before conducting audio testing, the standard protocol type corresponding to the headphone interface under test, i.e., CTIA or OMTP, only needs to be provided to the main control module 10. The main control module 10 can then select to use the first circuit or the second circuit for audio testing, while disabling the other circuit that is not needed for the current test, thereby achieving dynamic configuration of the test signal source path.

[0071] In this embodiment, the headphone adapter cable includes a portion that plugs into the audio testing device and a headphone plug that plugs into the headphone jack.

[0072] In this embodiment, the headphone jack can be a common 3.5mm headphone jack, or other headphone jacks that can be manufactured using either the CTIA standard or the OMTP standard. This embodiment does not impose any restrictions on this.

[0073] In this embodiment, M / G stands for Mic / Ground, and G / M stands for Ground / Mic. The difference between the two is that the arrangement order of the microphone pin and the ground pin is different on headphone interfaces made using different standards.

[0074] In this embodiment, the audio testing device can be used to test the audio circuit performance of the headphone jack under test. First, the main control module 10 can output a standard sine wave signal with a specified frequency and effective value. After the standard sine wave signal is processed by the buffer module 20 and the coupling module 30, a high-stability, low-noise reference signal can be generated. After the reference signal is received at the MIC end of the headphone jack under test, an audio signal will be synchronously transmitted back to the audio testing device. The main control module 10 collects the transmitted signal after it has been filtered by the filtering module 40, and can synchronously calculate the RMS (Root Mean Square) amplitude accuracy and THD (Total Harmonic Distortion) distortion. Then, by comparing the measured values ​​with the preset tolerance range, the signal fidelity within the audio passband can be verified.

[0075] In this embodiment, DET on the headphone jack under test stands for Detect (headphone insertion detection) and is used for insertion and removal testing. The headphone jack under test can be set on the terminal under test. When the headphone plug is inserted into the headphone jack under test, the DET pin level is actively pulled low. Therefore, the terminal under test can confirm the reliability of the device insertion and removal detection function by monitoring the level transition state of the DET pin.

[0076] In this embodiment, the audio testing device can perform protocol compatibility testing: for headphone jacks using the CTIA standard, testing can be performed through the first circuit in the audio testing device, in which case the test signal is injected into the headphone jack under test from the M / G terminal; for headphone jacks using the OMTP standard, testing can be performed through the second circuit in the audio testing device, in which case the test signal is injected into the headphone jack under test from the G / M terminal.

[0077] Reference Figure 2 In some feasible embodiments, the main control module 10 includes:

[0078] Digital-to-analog converter 11 is electrically connected to the first output terminal OUT1 and the second output terminal OUT2, respectively.

[0079] Analog-to-digital converter 12 is electrically connected to the first input terminal IN1 and the second input terminal IN2 respectively;

[0080] Processing unit 13 is electrically connected to digital-to-analog conversion unit 11 and analog-to-digital conversion unit 12, respectively.

[0081] In this embodiment, the main control module 10 can be an MCU (Micro Controller Unit) or other devices with similar functions. Taking an MCU as an example, it can have a built-in digital-to-analog converter unit 11 and an analog-to-digital converter unit 12, namely a DAC (Digital to Analog Converter) and an ADC (Analog to Digital Converter). The first output terminal OUT1 can be regarded as the MCU_DAC0 pin on the MCU, the second output terminal OUT2 can be regarded as the MCU_DAC1 pin on the MCU, the first input terminal IN1 can be regarded as the MCU_ADC0 pin on the MCU, and the second input terminal IN2 can be regarded as the MCU_ADC1 pin on the MCU. The processing unit 13 can be the processor of the MCU, such as a CPU (Central Processing Unit 13). The processing unit 13 processes the output and input data, so that the audio testing device can perform test results without manual judgment.

[0082] Reference Figure 3 In some feasible embodiments, the buffer module 20 includes a first buffer unit 21 and a second buffer unit 22, the coupling module 30 includes a first coupling unit 31 and a second coupling unit 32, and the filtering module 40 includes a first filtering unit 41 and a second filtering unit 42.

[0083] The input terminal of the first buffer unit 21 is electrically connected to the first output terminal OUT1, the output terminal of the first buffer unit 21 is electrically connected to the input terminal of the first coupling unit 31, the output terminal of the first coupling unit 31 is connected to the M / G terminal through the headphone adapter cable, the input terminal of the first filter unit 41 is connected to the right channel terminal R through the headphone adapter cable, and the output terminal of the first filter unit 41 is electrically connected to the first input terminal IN1.

[0084] The input terminal of the second buffer unit 22 is electrically connected to the second output terminal OUT2, the output terminal of the second buffer unit 22 is electrically connected to the input terminal of the second coupling unit 32, the output terminal of the second coupling unit 32 is connected to the G / M terminal through a headphone adapter cable, the input terminal of the second filter unit 42 is connected to the left channel terminal L through a headphone adapter cable, and the output terminal of the second filter unit 42 is electrically connected to the second input terminal IN2.

[0085] In this embodiment, the input terminals of the first buffer unit 21 and the second buffer unit 22 together form the input terminal of the buffer module 20, and the output terminals of the first buffer unit 21 and the second buffer unit 22 together form the output terminal of the buffer module 20; the input terminals of the first coupling unit 31 and the second coupling unit 32 together form the input terminal of the coupling module 30, and the output terminals of the first coupling unit 31 and the second coupling unit 32 together form the output terminal of the coupling module 30; the input terminals of the first filtering unit 41 and the second filtering unit 42 together form the input terminal of the filtering module 40, and the output terminals of the first filtering unit 41 and the second filtering unit 42 together form the output terminal of the filtering module 40.

[0086] In this embodiment, the buffer module 20, the coupling module 30, and the filtering module 40 respectively include a first buffer unit 21, a first coupling unit 31, and a first filtering unit 41 in the first loop, and a second buffer unit 22, a second coupling unit 32, and a second filtering unit 42 in the second loop, thereby enabling the audio testing device to be compatible with testing headphone interfaces using different standard protocol types.

[0087] Reference Figure 4 In some feasible embodiments, the first buffer unit 21 includes:

[0088] The first resistor R1 is electrically connected to the first output terminal OUT1.

[0089] The second resistor R2 has its first end electrically connected to the second end of the first resistor R1, and its second end is grounded.

[0090] The first operational amplifier U1 has its positive input terminal electrically connected to the first terminal of the second resistor R2, and its negative input terminal and output terminal are electrically connected.

[0091] The third resistor R3, the first end of the third resistor R3 is electrically connected to the output terminal of the first operational amplifier U1;

[0092] The fourth resistor R4 has its first end electrically connected to the first end of the first resistor R1, and its second end electrically connected to the second end of the third resistor R3.

[0093] The fifth resistor R5 has its first end electrically connected to the second end of the fourth resistor R4, and its second end electrically connected to the input end of the first coupling unit 31.

[0094] The sixth resistor R6 is connected in parallel with the fifth resistor R5;

[0095] The first capacitor C1 has its first terminal electrically connected to the second terminal of the fifth resistor R5, and its second terminal is grounded.

[0096] In this embodiment, the first end of the first resistor R1 and the first end of the fourth resistor R4 together form the first end of the first buffer unit 21, and the second end of the fifth resistor R5, the second end of the sixth resistor R6 and the first end of the first capacitor C1 together form the second end of the first buffer unit 21.

[0097] Reference Figure 5 In some feasible embodiments, the second buffer unit 22 includes:

[0098] The seventh resistor R7 has its first terminal electrically connected to the second output terminal OUT2.

[0099] The eighth resistor R8 has its first terminal electrically connected to the second terminal of the seventh resistor R7, and its second terminal is grounded.

[0100] The positive input terminal of the second operational amplifier U2 is electrically connected to the first terminal of the eighth resistor R8, and the negative input terminal and the output terminal of the second operational amplifier U2 are electrically connected.

[0101] The ninth resistor R9 has its first terminal electrically connected to the output terminal of the second operational amplifier U2.

[0102] The tenth resistor R10 is electrically connected to the first end of the seventh resistor R7, and the second end of the tenth resistor R10 is electrically connected to the second end of the ninth resistor R9.

[0103] The eleventh resistor R11 has its first end electrically connected to the second end of the tenth resistor R10, and its second end is electrically connected to the input end of the second coupling unit 32.

[0104] The twelfth resistor R12 is connected in parallel with the eleventh resistor R11;

[0105] The second capacitor C2 has its first terminal electrically connected to the second terminal of the eleventh resistor R11, and its second terminal grounded.

[0106] In this embodiment, the first end of the seventh resistor R7 and the first end of the tenth resistor R10 together form the first end of the second buffer unit 22, and the second end of the eleventh resistor R11, the second end of the twelfth resistor R12, and the first end of the second capacitor C2 together form the second end of the second buffer unit 22.

[0107] Combination Figure 4 and Figure 5 As can be seen, in this embodiment, the first buffer unit 21 and the second buffer unit 22 can be implemented as buffers, consisting of operational amplifiers, resistors, and capacitors. They mainly serve to match impedance, enhance current driving capability, and provide signal isolation and protection, preventing damage to the internal circuitry of the main control module 10 when the load is short-circuited or overcurrent occurs, thereby ensuring that the main control module 10 can output a standard sine wave signal to meet audio testing requirements. It is understood that, in addition to... Figure 4 and Figure 5 In addition to the buffer shown, the first buffer unit 21 and the second buffer unit 22 can also be implemented by other devices with similar buffering functions, and this embodiment does not limit this.

[0108] Reference Figure 6 In some feasible embodiments, the first coupling unit 31 includes:

[0109] The third capacitor C3 has its first end electrically connected to the output end of the first buffer unit 21, and its second end connected to the M / G terminal via an earphone adapter cable.

[0110] In this embodiment, the first end of the third capacitor C3 can be regarded as the input end of the first coupling unit 31, and the second end of the third capacitor C3 can be regarded as the output end of the first coupling unit 31.

[0111] Reference Figure 7 In some feasible embodiments, the second coupling unit 32 includes:

[0112] The fourth capacitor C4 has its first end electrically connected to the output of the second buffer unit 22, and its second end connected to the G / M terminal via an earphone adapter cable.

[0113] In this embodiment, the first end of the fourth capacitor C4 can be regarded as the input end of the second coupling unit 32, and the second end of the fourth capacitor C4 can be regarded as the output end of the second coupling unit 32.

[0114] Combination Figure 6 and Figure 7 It can be seen that in this embodiment, the first coupling unit 31 and the second coupling unit 32 can be AC ​​(alternating current) couplers implemented by capacitors. Through the characteristics of capacitors, DC bias can be blocked, preventing the M / G or G / M pins at the headphone jack under test from being damaged. It is understood that, in addition to... Figure 6 and Figure 7 In addition to the AC coupler shown, the first coupling unit 31 and the second coupling unit 32 can also be implemented by other devices with similar coupling functions, and this embodiment does not limit this.

[0115] Reference Figure 8 In some feasible embodiments, the first filtering unit 41 includes:

[0116] The fifth capacitor C5 has its first end connected to the right channel terminal R via a headphone adapter cable, and its second end electrically connected to the first input terminal IN1.

[0117] The thirteenth resistor R13 has its first terminal electrically connected to the second terminal of the fifth capacitor C5, and its second terminal is electrically connected to the power supply VDD.

[0118] In this embodiment, the first end of the fifth capacitor C5 can be regarded as the input end of the first filter unit 41, and the second end of the fifth capacitor C5 and the first end of the thirteenth resistor R13 together form the output end of the first filter unit 41.

[0119] Reference Figure 9 In some feasible embodiments, the second filtering unit 42 includes:

[0120] The sixth capacitor C6 has its first end connected to the left channel L via a headphone adapter cable, and its second end is electrically connected to the second input terminal IN2.

[0121] The fourteenth resistor R14 has its first terminal electrically connected to the second terminal of the sixth capacitor C6, and its second terminal electrically connected to the power supply VDD.

[0122] In this embodiment, the first end of the sixth capacitor C6 can be regarded as the input end of the second filter unit 42, and the second end of the sixth capacitor C6 and the first end of the thirteenth resistor R13 together form the output end of the second filter unit 42.

[0123] Combination Figure 8 and Figure 9 As can be seen, in this embodiment, the first filtering unit 41 and the second filtering unit 42 can be low-pass filters implemented by RC circuits, which mainly play a noise suppression role, used to filter out the high-frequency part of the audio signal output from the headphone jack under test; it is understood that, in addition to Figure 8 and Figure 9 In addition to the low-pass filter shown, the first filter unit 41 and the second filter unit 42 can also be implemented by other devices with similar filtering functions, and this embodiment does not limit this.

[0124] This embodiment provides an audio testing device that constructs two test channels through a main control module, a buffer module, a coupling module, and a filtering module. It can be used to test headphone interfaces that adopt the CTIA international standard as well as those that adopt the OMTP national standard. The test results can be analyzed by the main control module, making it suitable for automated testing scenarios. It avoids the risk of human error and missed detection, and improves testing efficiency.

[0125] Compared to traditional testing methods that require changing test equipment based on different headphone jacks under test, this embodiment is compatible with different headphone jacks under test, achieving protocol compatibility. Compared to traditional testing methods that rely on manual judgment of test results, this embodiment can automatically determine signal quality by calculating THD through the main control module, with an accuracy of ±0.05%. Compared to traditional testing methods that require configuring signal sources and analyzers, this embodiment can complete the entire testing process solely through the main control module, reducing hardware costs by approximately 60%.

[0126] In addition, this application embodiment also provides an audio testing system, which includes a headphone jack under test and the audio testing device provided in the above embodiment. The audio testing device is connected to the headphone jack under test through a headphone adapter cable.

[0127] Since the audio testing system proposed in this embodiment includes the audio testing device proposed in the above embodiments, it has the beneficial effects of the above embodiments. For details on the specific working process and principle of the audio testing device, please refer to the audio testing devices provided in the above embodiments. They will not be described in detail here, and all are within the protection scope of this embodiment.

[0128] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0129] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B.

[0130] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0131] It should also be understood that references to "one embodiment" or "some embodiments" in the specification of embodiments of this application mean that one or more embodiments of this application include the specific features, structures, or characteristics described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0132] It should be noted that the technical solutions of the various embodiments of this application can be combined with each other, but only if they are implemented by those skilled in the art. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0133] The above are merely optional embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An audio testing device, characterized by, The audio testing device includes: The main control module includes a first output terminal, a second output terminal, a first input terminal, and a second input terminal; A buffer module, wherein the input terminal of the buffer module is electrically connected to the first output terminal and the second output terminal; A coupling module, wherein the input terminal of the coupling module is electrically connected to the output terminal of the buffer module, and the output terminal of the coupling module is connected to the M / G terminal and G / M terminal of the headphone interface under test through a headphone adapter cable; A filtering module, wherein the input end of the filtering module is connected to the left and right channels of the headphone interface under test via the headphone adapter cable, and the output end of the filtering module is electrically connected to the first input end and the second input end; A first circuit is formed between the first output terminal and the first input terminal, and a second circuit is formed between the second output terminal and the second input terminal. The first circuit is used to test headphone jacks using the CTIA standard, and the second circuit is used to test headphone jacks using the OMTP standard.

2. The audio testing apparatus of claim 1, wherein, The main control module includes: A digital-to-analog converter unit, wherein the digital-to-analog converter unit is electrically connected to the first output terminal and the second output terminal respectively; An analog-to-digital conversion unit, wherein the analog-to-digital conversion unit is electrically connected to the first input terminal and the second input terminal respectively; The processing unit is electrically connected to both the digital-to-analog converter and the analog-to-digital converter.

3. The audio testing apparatus of claim 1, wherein, The buffer module includes a first buffer unit and a second buffer unit, the coupling module includes a first coupling unit and a second coupling unit, and the filtering module includes a first filtering unit and a second filtering unit. The input terminal of the first buffer unit is electrically connected to the first output terminal, the output terminal of the first buffer unit is electrically connected to the input terminal of the first coupling unit, the output terminal of the first coupling unit is connected to the M / G terminal through the headphone adapter cable, the input terminal of the first filter unit is connected to the right channel terminal through the headphone adapter cable, and the output terminal of the first filter unit is electrically connected to the first input terminal. The input terminal of the second buffer unit is electrically connected to the second output terminal, the output terminal of the second buffer unit is electrically connected to the input terminal of the second coupling unit, the output terminal of the second coupling unit is connected to the G / M terminal through the headphone adapter cable, the input terminal of the second filter unit is connected to the left channel terminal through the headphone adapter cable, and the output terminal of the second filter unit is electrically connected to the second input terminal.

4. The audio testing apparatus as described in claim 3, characterized in that, The first buffer unit includes: A first resistor, wherein a first end of the first resistor is electrically connected to the first output terminal; The second resistor has its first end electrically connected to the second end of the first resistor, and its second end grounded. The first operational amplifier has its positive input terminal electrically connected to the first terminal of the second resistor, and its negative input terminal and output terminal electrically connected. The third resistor, the first end of which is electrically connected to the output terminal of the first operational amplifier; A fourth resistor, wherein the first end of the fourth resistor is electrically connected to the first end of the first resistor, and the second end of the fourth resistor is electrically connected to the second end of the third resistor; The fifth resistor has its first end electrically connected to the second end of the fourth resistor, and its second end electrically connected to the input end of the first coupling unit. The sixth resistor is connected in parallel with the fifth resistor; A first capacitor, the first terminal of which is electrically connected to the second terminal of the fifth resistor, and the second terminal of which is grounded.

5. The audio testing apparatus of claim 3, wherein, The second buffer unit includes: The seventh resistor, wherein the first end of the seventh resistor is electrically connected to the second output terminal; The eighth resistor has its first end electrically connected to the second end of the seventh resistor, and its second end is grounded. The second operational amplifier has its positive input terminal electrically connected to the first terminal of the eighth resistor, and its negative input terminal and output terminal are electrically connected. The ninth resistor, the first end of which is electrically connected to the output terminal of the second operational amplifier; The tenth resistor has its first end electrically connected to the first end of the seventh resistor, and its second end electrically connected to the second end of the ninth resistor. The eleventh resistor has its first end electrically connected to the second end of the tenth resistor, and its second end electrically connected to the input end of the second coupling unit. The twelfth resistor is connected in parallel with the eleventh resistor; The second capacitor has its first terminal electrically connected to the second terminal of the eleventh resistor, and its second terminal grounded.

6. The audio testing apparatus of claim 3, wherein, The first coupling unit includes: The third capacitor has its first end electrically connected to the output end of the first buffer unit, and its second end connected to the M / G terminal via the headphone adapter cable.

7. The audio testing apparatus as described in claim 3, characterized in that, The second coupling unit includes: The fourth capacitor has its first end electrically connected to the output end of the second buffer unit, and its second end connected to the G / M terminal via the headphone adapter cable.

8. The audio testing apparatus of claim 3, wherein, The first filtering unit includes: The fifth capacitor has its first end connected to the right channel end via the headphone adapter cable, and its second end electrically connected to the first input end. The thirteenth resistor has its first end electrically connected to the second end of the fifth capacitor, and its second end electrically connected to the power supply.

9. The audio testing apparatus of claim 3, wherein, The second filtering unit includes: The sixth capacitor has its first end connected to the left channel end via the headphone adapter cable, and its second end electrically connected to the second input end. The fourteenth resistor has its first end electrically connected to the second end of the sixth capacitor, and its second end electrically connected to the power supply.

10. An audio test system characterized by, The audio testing system includes a headphone jack under test and an audio testing device as described in any one of claims 1 to 9, wherein the audio testing device is connected to the headphone jack under test via a headphone adapter cable.

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