Earphone microphone sensitivity compensation calibration system and sensitivity test device

Abstract

The utility model provides an earphone microphone sensitivity compensation calibration system and a sensitivity test device.The system comprises a main control module, a sound card power amplifier module, a sensitivity test module and an earphone module, and the main control module is provided with an acquisition unit, a comparison calculation unit, a gain setting unit and a sending unit; the acquisition unit is used for acquiring gain values of a main microphone and an auxiliary microphone of the to-be-tested earphone, so that the gain values of the main microphone and the auxiliary microphone of the to-be-tested earphone are respectively marked as a first gain value and a second gain value; the comparison calculation unit is used for comparing whether the first gain value is in a first gain value interval and whether the second gain value is in a second gain value interval. When the obtained gain value is out of the corresponding range, the absolute difference value between the gain value and the upper limit of the gain value in the corresponding range is obtained, and the difference value is written into the chip of the earphone to be tested, so that the sensitivity value calibrated last is used as the reference value in the subsequent earphone test, and the requirement of batch test can be met.

Description

Technical Field

[0001] This disclosure relates to the field of headphone testing technology, and in particular to a headphone microphone sensitivity compensation calibration system and sensitivity testing device. Background Technology

[0002] The Teams wireless Bluetooth headset is designed for high-quality audio communication scenarios. With the rapid development of today's society, its practicality in online meetings, video calls, and voice communication is increasingly appreciated by consumers.

[0003] To ensure Teams certification, the production line currently only performs differential testing on the headphone's main microphone, and only verifies the curve characteristics at two angles: 0 degrees (facing the sound source) and 180 degrees (facing away from the sound source). It lacks testing of the headphone microphone's gain value under simulated usage scenarios. This makes it impossible to optimize the balance between voice sensitivity and background noise through the headphone microphone's gain value, leading to fluctuations in microphone sensitivity. Consequently, the headphones cannot effectively guarantee Teams certification, resulting in users experiencing issues such as poor microphone sensitivity, call abnormalities, or interruptions, significantly diminishing the user experience. Utility Model Content

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a headphone microphone sensitivity compensation calibration system and sensitivity testing device that can perform headphone microphone compensation value testing to ensure that users are less likely to have sensitivity and call problems when using headphones.

[0005] The purpose of this disclosure is achieved through the following technical solution:

[0006] A headphone microphone sensitivity compensation calibration system includes a main control module, a sound card amplifier module, a sensitivity testing module, and a headphone module. The unidirectional output terminal of the main control module is electrically connected to the power input terminal of the sound card amplifier module, and the unidirectional output terminal of the sound card amplifier module is electrically connected to the power input terminal of the sensitivity testing module. The bidirectional data communication terminal of the main control module is electrically connected to the bidirectional data interaction terminal of the sensitivity testing module. The headphone power supply terminal of the sensitivity testing module is electrically connected to the power input terminal of the headphone module. The communication output terminal of the main control module is communicatively connected to the communication receiving terminal of the headphone module. The signal output terminal of the sensitivity testing module is used to emit acoustic signals to the main and secondary microphones of the acoustic prototype, and to emit acoustic signals to the main and secondary microphones of the test headphones. The input terminal of the sensitivity testing module is used to electrically connect the acoustic prototype and the test headphones. The main control module has an acquisition unit, a comparison calculation unit, a gain setting unit, and a transmission unit. The data receiving terminal of the acquisition unit is electrically connected to the output transmission terminal of the sensitivity testing module. The data acquisition terminal of the comparison calculation unit is electrically connected to the transmission terminal of the acquisition unit. The comparison terminal of the gain setting unit is electrically connected to the numerical comparison terminal of the comparison calculation unit. The difference acquisition terminal of the transmitting unit is electrically connected to the difference output terminal of the comparison calculation unit, and the data transmitting terminal of the transmitting unit is communicatively connected to the communication receiving terminal of the headphone module; the acquisition unit is used to acquire the gain values ​​of the main microphone and the secondary microphone of the acoustic prototype in a first mode; and, in a second mode, acquire the gain values ​​of the main microphone and the secondary microphone of the acoustic prototype; and, in the second mode, acquire the gain values ​​of the main microphone and the secondary microphone of the headphone under test, so that the gain values ​​of the main microphone and the secondary microphone of the headphone under test are respectively recorded as the first gain value and the second gain value; the gain setting unit is used to set the first gain value range and the second gain value range, the... The comparison calculation unit is used to compare whether the first gain value is within the first gain value interval and whether the second gain value is within the second gain value interval. The comparison calculation unit is also used to perform an absolute subtraction calculation on the first gain value located outside the first gain value interval and the upper limit value of the first gain value interval to obtain a first difference value, and to perform an absolute subtraction calculation on the second gain value located outside the second gain value interval and the upper limit value of the second gain value interval to obtain a second difference value. The sending unit is used to write the first difference value and / or the second difference value into the chip of the earphone under test.

[0007] In one embodiment, the sensitivity testing module includes a first simulated mouth, a second simulated mouth, and a testing fixture. Both the first simulated mouth and the second simulated mouth are disposed on the testing fixture. The first simulated mouth is used to emit acoustic signals to the main microphone of the acoustic prototype and the main microphone of the earphone to be tested, and the second simulated mouth is used to emit acoustic signals to the secondary microphone of the acoustic prototype and the secondary microphone of the earphone to be tested.

[0008] In one embodiment, the power supply terminal of the test fixture is electrically connected to the power connection terminal of the headphone module.

[0009] In one embodiment, the power terminals of the first and second simulated mouthpieces are both electrically connected to the unidirectional output terminal of the sound card amplifier module.

[0010] In one embodiment, the headphone module is an acoustic prototype or a headphone to be tested.

[0011] In one embodiment, the main control module is a test computer.

[0012] In one embodiment, the sound card amplifier module is an integrated sound card amplifier.

[0013] In one embodiment, the headphone microphone sensitivity compensation calibration system further includes a number system conversion module. The value receiving end of the number system conversion module is electrically connected to the value output end of the transmitting unit, and the value conversion output end of the number system conversion module is electrically connected to the data receiving end of the sensitivity test module, so that the number system conversion module is used to convert the acquired first difference and second difference into number systems and write them into the chip of the headphone under test.

[0014] In one embodiment, the number system conversion module is a hexadecimal conversion module; and the number system conversion module is used to convert the acquired first difference and second difference into hexadecimal and write them into the chip of the earphone to be tested.

[0015] A sensitivity testing device includes the headphone microphone sensitivity compensation calibration system described in any of the above embodiments.

[0016] Compared with the prior art, this disclosure has at least the following advantages:

[0017] The aforementioned headphone microphone sensitivity compensation calibration system calibrates the gain values ​​of the main / secondary microphones in the headphone under test to ensure that the calibrated sensitivity is consistent with that of the acoustic prototype. When the acquired gain value is within the corresponding range, no calibration is performed. When the gain value is outside the corresponding range, the absolute difference between the gain value and the upper limit of the corresponding range is calculated and written into the chip of the headphone under test. This allows subsequent headphone tests to use the previously calibrated sensitivity value as a reference value. This can meet the needs of batch testing, ensure the production quality of the headphones, and thus prevent users from experiencing call interruptions when using the headphones. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a module of an earphone microphone sensitivity compensation calibration system in one embodiment;

[0020] Figure 2 for Figure 1 The diagram shows the specific schematic of the headphone microphone sensitivity compensation calibration system module.

[0021] Figure 3 for Figure 1 The flowchart shown corresponds to the headphone microphone sensitivity compensation calibration system.

[0022] Figure 4 for Figure 1 The flowchart shown is for testing headphones with a headphone microphone sensitivity compensation calibration system.

[0023] Figure 5 This is a schematic diagram of a module for a headphone microphone sensitivity compensation calibration system in another embodiment.

[0024] Reference numerals: 10, Headphone / Microphone Sensitivity Compensation Calibration System; 100, Main Control Module; 110, Acquisition Unit; 120, Comparison and Calculation Unit; 130, Gain Setting Unit; 140, Transmission Unit; 200, Sound Card Amplifier Module; 300, Sensitivity Testing Module; 310, First Simulated Mouth; 320, Second Simulated Mouth; 330, Test Fixture; 400, Headphone Module; 500, Number System Conversion Module. Detailed Implementation

[0025] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0029] Please see Figures 1 to 3This is an embodiment of the headphone microphone sensitivity compensation calibration system 10, comprising a main control module 100, a sound card amplifier module 200, a sensitivity testing module 300, and a headphone module 400. The unidirectional output terminal of the main control module 100 is electrically connected to the power input terminal of the sound card amplifier module 200, and the unidirectional output terminal of the sound card amplifier module 200 is electrically connected to the power input terminal of the sensitivity testing module 300. The bidirectional data communication terminal of the main control module 100 is electrically connected to the bidirectional data interaction terminal of the sensitivity testing module 300. The headphone power supply terminal of the sensitivity testing module 300 is electrically connected to the power input terminal of the headphone module 400. The communication output terminal of the main control module 100... The output terminal is connected to the communication receiving terminal of the headphone module 400; the signal output terminal of the sensitivity test module 300 is used to send acoustic signals to the main and auxiliary microphones of the acoustic prototype, and to send acoustic signals to the main and auxiliary microphones of the test headphones; the input terminal of the sensitivity test module 300 is used to electrically connect the acoustic prototype and the test headphones; the main control module 100 has an acquisition unit 110, a comparison calculation unit 120, a gain setting unit 130, and a transmission unit 140; the data receiving terminal of the acquisition unit 110 is electrically connected to the output transmitting terminal of the sensitivity test module 300, and the data acquisition terminal of the comparison calculation unit 120 is electrically connected to the transmitting terminal of the acquisition unit 110. The comparison terminal of the gain setting unit 130 is electrically connected to the numerical comparison terminal of the comparison calculation unit 120, the difference acquisition terminal of the sending unit 140 is electrically connected to the difference output terminal of the comparison calculation unit 120, and the data sending terminal of the sending unit 140 is communicatively connected to the communication receiving terminal of the headphone module 400; the acquisition unit 110 is used to acquire the gain values ​​of the main microphone and the secondary microphone of the acoustic prototype in a first mode; and, in a second mode, acquire the gain values ​​of the main microphone and the secondary microphone of the acoustic prototype; and, in the second mode, acquire the gain values ​​of the main microphone and the secondary microphone of the headphone under test, so that the gain values ​​of the main microphone and the secondary microphone of the headphone under test are recorded as the first gain value and the second gain value, respectively; The gain setting unit 130 is used to set a first gain value range and a second gain value range. The comparison calculation unit 120 is used to compare whether the first gain value is within the first gain value range and whether the second gain value is within the second gain value range. The comparison calculation unit 120 is also used to perform an absolute subtraction calculation between the first gain value located outside the first gain value range and the upper limit value of the first gain value range to obtain a first difference value, and to perform an absolute subtraction calculation between the second gain value located outside the second gain value range and the upper limit value of the second gain value range to obtain a second difference value. The sending unit 140 is used to write the first difference value and / or the second difference value into the chip of the earphone under test.

[0030] In this embodiment, a first gain value interval is formed between the upper limit and the lower limit of the first gain value, and a second gain value interval is formed between the upper limit and the lower limit of the second gain value. Furthermore, both the first and second gain value intervals are set according to user needs.

[0031] It is understandable that the first mode represents a mode that simulates the user's real-world usage environment, using only a single simulated mouthpiece to test the sensitivity of the main and secondary microphones of the acoustic prototype; the second mode represents a mode that uses dual simulated mouthpieces.

[0032] In this embodiment, the headphone microphone sensitivity compensation calibration system 10 calibrates the gain values ​​of the main / secondary microphones in the headphone under test to ensure that the calibrated sensitivity matches that of the acoustic prototype. When the acquired gain value is within the corresponding range, no calibration is performed. When the gain value is outside the corresponding range, the absolute difference between the gain value and the upper limit of the corresponding range is calculated and written into the chip of the headphone under test. This allows subsequent headphone tests to use the previously calibrated sensitivity value as a reference value, thus meeting the needs of batch testing, ensuring the production quality of the headphones, and preventing users from experiencing call interruptions. Furthermore, the sound card amplifier module 200 amplifies the acoustic signal emitted by the simulated mouth in the sensitivity test module 300 so that the display area of ​​the main control module 100 can display the corresponding curve data of the main / secondary microphones of the headphone.

[0033] Under normal circumstances, the sensitivity calibration of headphone microphones can only be completed in a specific laboratory and cannot be applied to general headphone production testing lines. The process steps of this solution are as follows: Figure 4As shown, first select the acoustic prototype (Golden) To simulate a real user environment, a single simulated mouthpiece was first used for testing. The main microphone of the acoustic prototype was aligned with this simulated mouthpiece, and both the main and secondary microphones of the acoustic prototype were turned on to receive the acoustic signal emitted by the single simulated mouthpiece. Then, the audio curve data of the main and secondary microphones were acquired, and the sensitivity difference between the two was limited to greater than or equal to 19dB. Then, a simulated mouthpiece was added. The main microphone of the acoustic prototype was aligned with one simulated mouthpiece, and the secondary microphone was turned off. After testing and obtaining curve data, the main microphone was turned off, the secondary microphone was turned on, and the secondary microphone was aligned with another simulated mouthpiece. After testing and obtaining another curve data, this data was uploaded to the main control module 100. Subsequently, the earphone under test will use two simulated mouthpieces. The same steps were followed. First, the curve data of the main microphone of the earphone under test (i.e., the curve data between frequency and sensitivity) was acquired. Then, a 1kHz frequency was selected, and the corresponding sensitivity was acquired. Finally, this data was uploaded to the main control module 100 as a reference value. Each execution of the test steps for the earphone under test will serve as a calibration reference value for the next execution of the test steps for the earphone under test. Subsequently, according to user needs, a first gain value range (the gain range of the main microphone) and a second gain value range (the gain range of the secondary microphone) are set. Then, the sensitivities of the main and secondary microphones of the test earphones, as measured by the main control module 100, are compared to see if they fall within their respective gain value ranges. If both are within their ranges, no calibration is performed. If the main microphone's sensitivity is outside its range, the absolute value of the current gain value is subtracted from the upper limit of the main microphone's gain value to obtain a calibration difference, which is then written to the earphone's chip for calibration. Similarly, if the secondary microphone's sensitivity is outside its range, the absolute value of the current gain value is subtracted from the upper limit of the secondary microphone's gain value to obtain a calibration difference, which is also written to the earphone's chip (IC) for calibration. Further, the absolute value subtraction step involves subtracting the earphone gain value from the upper limit of the gain value to obtain the absolute value of the difference.

[0034] For example, based on user needs, the first gain range can be set to -13dB to -12dB, with an upper limit of -12dB. The second gain range can be set to -16dB to -14dB, with an upper limit of -14dB. When the sensitivity of the main microphone is -12.5dB and the sensitivity of the secondary microphone is -17dB, the main microphone is not calibrated, but the secondary microphone is calibrated. The absolute value of the current value is subtracted from the corresponding upper limit of the gain value, and the difference is 3. This difference is written into the chip of the headphone to calibrate the secondary microphone of the headphone under test. This reduces the sound quality distortion caused by signal enhancement or attenuation at specific frequencies during subsequent use.

[0035] like Figure 2 and Figure 3As shown, in one embodiment, the sensitivity testing module 300 includes a first simulated mouth 310, a second simulated mouth 320, and a testing fixture 330. The first simulated mouth 310 and the second simulated mouth 320 are both disposed on the testing fixture 330. The first simulated mouth 310 is used to emit acoustic signals to the main microphone of the acoustic prototype and the main microphone of the earphone under test, and the second simulated mouth 320 is used to emit acoustic signals to the auxiliary microphone of the acoustic prototype and the auxiliary microphone of the earphone under test. Understandably, in the first mode, which simulates the user's actual usage environment, only the first simulated mouthpiece 310 is used. The main microphone of the acoustic prototype is aligned with the first simulated mouthpiece 310 to test the sensitivity of the main and secondary microphones of the acoustic prototype, ensuring that the difference between their sensitivities is greater than 19dB, so as to ensure that the test environment is consistent with the user's actual usage environment. At this time, the first simulated mouthpiece 310 emits an acoustic signal to the main microphone. In the second mode, which uses a dual simulated mouthpiece, the main microphone of the acoustic prototype is first aligned with the first simulated mouthpiece 310, and the secondary microphone is aligned with the second simulated mouthpiece 320. Then, each simulated mouthpiece emits an acoustic signal to display the corresponding curve data in the main control module 100 as a test reference value. Subsequently, the headphone to be tested is used, and the steps are the same as in the second mode. The corresponding curve data is displayed in the main control module 100, and the gain value at the specified frequency is saved for subsequent comparison of the gain value with the upper limit of the gain value. The calibrated data is used as a reference value for the next headphone to be tested.

[0036] Furthermore, the power supply terminal of the test fixture 330 is electrically connected to the power input terminal of the headphone module 400. Furthermore, the test fixture 330 and the headphone module 400 can be connected via wired or wireless means, allowing the test computer to read specific headphone information for obtaining corresponding curve data in subsequent tests.

[0037] In one embodiment, the power terminals of the first simulated mouth 310 and the second simulated mouth 320 are both electrically connected to the unidirectional output terminal of the sound card power amplifier module 200, so that the acoustic signals emitted by the first simulated mouth 310 and the second simulated mouth 320 are amplified by the power amplifier section of the sound card power amplifier module 200, so as to better reflect the corresponding data of the main microphone and the auxiliary microphone in the test headphone, and facilitate the subsequent comparison of the sensitivity of the main microphone or the auxiliary microphone with the corresponding gain value range, and the corresponding absolute difference calculation.

[0038] In one embodiment, the headphone module 400 is an acoustic prototype or a headphone to be tested, so that the acoustic prototype is used as the test object during the initial test and the relevant parameters are used as reference points for the subsequent testing process of the headphone to be tested.

[0039] In one embodiment, the main control module 100 is a test computer. In this embodiment, the test computer serves as the core control unit of the system. It communicates with the sound card amplifier module 200 and the sensitivity test module 300 through a dedicated interface. Furthermore, during the testing of the acoustic prototype and the headphones under test, the test data is sent to the test computer, and the corresponding curve data is displayed through the human-machine interface (HMI) of the test computer, so that the operator can view the test status in real time, the sensitivity of the main and auxiliary microphones, and whether they are within the corresponding gain value range.

[0040] In one embodiment, the sound card amplifier module 200 is an all-in-one sound card amplifier.

[0041] like Figure 5 As shown, in one embodiment, the headphone microphone sensitivity compensation calibration system 10 further includes a base conversion module 500. The value receiving end of the base conversion module 500 is electrically connected to the value output end of the transmitting unit 140, and the value conversion output end of the base conversion module 500 is electrically connected to the data receiving end of the sensitivity test module 300. This allows the base conversion module 500 to convert the acquired first difference and second difference into bases and write them to the chip of the headphone under test. It can be understood that when the gain value of the main / secondary microphone is outside the corresponding gain value range, after calculating the absolute difference between the sensitivity and the upper limit of the gain value, the calculated value is sent to the base conversion module 500 to convert the decimal value into a value in another base. Finally, the value is written to the headphone chip so that the chip can read the converted value and perform headphone sensitivity calibration. Further, the base conversion module 500 is a hexadecimal conversion module; and the base conversion module 500 is used to convert the acquired first difference and second difference into hexadecimal and write them to the chip of the headphone under test.

[0042] This disclosure also provides a sensitivity testing device, including the headphone microphone sensitivity compensation calibration system 10 of any of the above embodiments.

[0043] Compared with the prior art, this disclosure has at least the following advantages:

[0044] The aforementioned headphone microphone sensitivity compensation calibration system 10 calibrates the gain values ​​of the main / secondary microphones in the headphone under test to ensure that the calibrated sensitivity is consistent with that of the acoustic prototype. When the acquired gain value is within the corresponding range, no calibration is performed. When the gain value is outside the corresponding range, the absolute difference between the gain value and the upper limit of the corresponding range is calculated and written into the chip of the headphone under test. This allows subsequent headphone tests to use the previously calibrated sensitivity value as a reference value. This can meet the needs of batch testing, ensure the production quality of the headphone, and thus prevent users from experiencing call interruptions when using the headphone.

[0045] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A headphone microphone sensitivity compensation calibration system, characterized in that, The device includes a main control module, a sound card amplifier module, a sensitivity testing module, and an earphone module. The unidirectional output terminal of the main control module is electrically connected to the power input terminal of the sound card amplifier module. The unidirectional output terminal of the sound card amplifier module is electrically connected to the power input terminal of the sensitivity testing module. The bidirectional data communication terminal of the main control module is electrically connected to the bidirectional data interaction terminal of the sensitivity testing module. The earphone power supply terminal of the sensitivity testing module is electrically connected to the power input terminal of the earphone module. The communication output terminal of the main control module is communicatively connected to the communication receiving terminal of the earphone module. The signal output terminal of the sensitivity test module is used to send acoustic signals to the main and auxiliary microphones of the acoustic prototype, and to send acoustic signals to the main and auxiliary microphones of the test headphones. The input terminal of the sensitivity test module is used to electrically connect the acoustic prototype and the test headphones. The main control module includes an acquisition unit, a comparison calculation unit, a gain setting unit, and a transmission unit. The data receiving end of the acquisition unit is electrically connected to the output transmitting end of the sensitivity test module. The data acquisition end of the comparison calculation unit is electrically connected to the transmitting end of the acquisition unit. The comparison end of the gain setting unit is electrically connected to the numerical comparison end of the comparison calculation unit. The difference acquisition end of the transmission unit is electrically connected to the difference output end of the comparison calculation unit. The data transmitting end of the transmission unit is communicatively connected to the communication receiving end of the headphone module. The acquisition unit is used to acquire the gain values ​​of the main microphone and the auxiliary microphone of the acoustic prototype in the first mode; In addition, the gain values ​​of the main microphone and the auxiliary microphone of the acoustic prototype were obtained in the second mode; In addition, in the second mode, the gain values ​​of the main microphone and the secondary microphone of the earphone under test are obtained, so that the gain values ​​of the main microphone and the secondary microphone of the earphone under test are recorded as the first gain value and the second gain value, respectively; the gain setting unit is used to set the first gain value range and the second gain value range; The comparison calculation unit is used to compare whether the first gain value is within the first gain value interval and whether the second gain value is within the second gain value interval. The comparison calculation unit is also used to perform an absolute subtraction calculation between the first gain value located outside the first gain value interval and the upper limit value of the first gain value interval to obtain a first difference value, and to perform an absolute subtraction calculation between the second gain value located outside the second gain value interval and the upper limit value of the second gain value interval to obtain a second difference value. The sending unit is used to write the first difference value and / or the second difference value into the chip of the earphone under test.

2. The headphone microphone sensitivity compensation calibration system according to claim 1, characterized in that, The sensitivity testing module includes a first simulated mouthpiece, a second simulated mouthpiece, and a testing fixture. Both the first and second simulated mouthpieces are mounted on the testing fixture. The first simulated mouthpiece is used to emit acoustic signals to the main microphone of the acoustic prototype and the main microphone of the earphone under test. The second simulated mouthpiece is used to emit acoustic signals to the secondary microphone of the acoustic prototype and the secondary microphone of the earphone under test.

3. The headphone microphone sensitivity compensation calibration system according to claim 2, characterized in that, The power supply terminal of the test fixture is electrically connected to the power input terminal of the earphone module.

4. The headphone microphone sensitivity compensation calibration system according to claim 2, characterized in that, The power terminals of the first and second simulated mouthpieces are both electrically connected to the unidirectional output terminals of the sound card amplifier module.

5. The headphone microphone sensitivity compensation calibration system according to claim 1, characterized in that, The headphone module is an acoustic prototype or a headphone to be tested.

6. The headphone microphone sensitivity compensation calibration system according to claim 1, characterized in that, The main control module is a test computer.

7. The headphone microphone sensitivity compensation calibration system according to claim 1, characterized in that, The sound card amplifier module is an integrated sound card amplifier unit.

8. The headphone microphone sensitivity compensation calibration system according to claim 1, characterized in that, The headphone microphone sensitivity compensation calibration system also includes a base conversion module. The value receiving end of the base conversion module is electrically connected to the value output end of the transmitting unit, and the value conversion output end of the base conversion module is electrically connected to the data receiving end of the sensitivity test module, so that the base conversion module can convert the acquired first difference and second difference into bases and write them into the chip of the headphone under test.

9. The headphone microphone sensitivity compensation calibration system according to claim 8, characterized in that, The number system conversion module is a hexadecimal conversion module; and, The number system conversion module is used to convert the acquired first difference and second difference into hexadecimal and write them into the chip of the earphone to be tested.

10. A sensitivity testing device, characterized in that, Includes the headphone microphone sensitivity compensation calibration system according to any one of claims 1-9.

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