Near-field radiation immunity test method and test system

Abstract

The present application relates to the technical field of acoustic testing, and particularly relates to a near-field radiation immunity test method and a test system. The near-field radiation immunity test method comprises controlling an antenna radiation test signal to form a radiation field of an acoustic device in a near-field radiation area; based on the radiation field formed by the test signal, controlling a performance analysis device to obtain an output response of the acoustic device; and based on the output response, the performance analysis device obtains at least one value of an electro-acoustic performance parameter of the acoustic device under the radiation field. The main purpose of the present application is to provide a near-field radiation immunity test method, which aims to test the acoustic performance of a microphone under the interference of near-field radiation.

Description

Technical Field

[0001] This invention relates to the field of acoustic testing technology, and in particular to a method and system for testing near-field radiated immunity. Background Technology

[0002] True wireless stereo (TWS) earbuds have gained widespread use due to their convenience in completely eliminating the constraints of cables. In order to achieve a smaller and lighter wearing experience, their internal structure design has become increasingly compact. Various electronic components, such as antennas, microphones, batteries, and main control chips, are highly integrated into an extremely limited space. This trend has resulted in the antennas used for wireless communication and the microphones used for calls or voice assistants being physically very close to each other.

[0003] In such miniaturized devices, when the communication module is operational, the antenna emits radio frequency signals for data transmission. These signals inevitably radiate in all directions. Due to the extremely close proximity of the microphone to the antenna, the radiated signals couple to the microphone's sensitive circuitry or diaphragm. This near-field radiated interference from the internal antenna directly affects the microphone's ability to properly pick up and convert target acoustic signals, leading to a deterioration in its electroacoustic performance and consequently impacting the microphone's call clarity and voice service quality. Summary of the Invention

[0004] The main objective of this invention is to provide a near-field radiation immunity test method, which aims to test the acoustic performance of a microphone under near-field radiation interference.

[0005] To achieve the above objectives, the present invention proposes a near-field radiated immunity testing method, applied to a testing system for testing the acoustic performance of acoustic devices. The testing system includes an antenna, a testing fixture, and a performance analysis device. The antenna is disposed within the testing fixture and is capable of radiating test signals within the fixture to generate a near-field radiation region. The performance analysis device is electrically connected to the acoustic device. The testing fixture is further configured to fix the acoustic device within the near-field radiation region. The near-field radiated immunity testing method includes:

[0006] The antenna is controlled to radiate the test signal to form a radiation field for the acoustic device in the near-field radiation region; Based on the radiation field formed by the test signal, the performance analysis device is controlled to obtain the output response of the acoustic device; Based on the output response, the performance analysis device obtains at least one electroacoustic performance parameter value of the acoustic device under the radiation field.

[0007] In one embodiment of the present invention, the test system further includes a signal generation module, which is independently disposed outside the test fixture. The antenna is electrically connected to the signal generation module. The step of controlling the antenna to radiate the test signal to form a radiation field for the acoustic device in the near-field radiation region includes: The signal generation module is controlled to generate the test signal; The test signal is fed to the antenna so that it is radiated by the antenna and forms the radiation field in the near-field radiation region.

[0008] In one embodiment of the present invention, the test system further includes a power meter, which is independently disposed outside the test fixture and electrically connected to the signal generation module. Before the step of controlling the signal generation module to generate the test signal, the system further includes: Obtain the real-time power value of the test signal measured by the power meter; Based on the real-time power value and the target power value of the test signal, the output of the signal generation module is adjusted so that the real-time power value of the test signal generated by the signal generation module reaches the target power value.

[0009] In one embodiment of the present invention, the test signal is a Bluetooth signal.

[0010] In one embodiment of the present invention, the electroacoustic performance parameter value is the sensitivity parameter value of the acoustic device.

[0011] In one embodiment of the present invention, the acoustic device is a microphone, and the step of controlling the performance analysis device to acquire the output response of the acoustic device includes: An excitation signal is input to the microphone; The performance analysis device is controlled to acquire the electrical signal output by the microphone under the excitation signal and the radiation field, and the electrical signal serves as the output response.

[0012] In one embodiment of the present invention, the step of the performance analysis device obtaining at least one electroacoustic performance parameter value of the acoustic device under the radiation field based on the output response includes: The performance analysis device is controlled to perform frequency domain analysis on the output response to obtain the signal component amplitude under the excitation signal; Based on the amplitude of the signal components, the sensitivity parameter value of the microphone under the radiation field is obtained.

[0013] The present invention also proposes a testing system for testing the acoustic performance of an acoustic device. The testing system includes an antenna, a testing fixture, and a performance analysis device. The antenna is disposed in the testing fixture and is capable of radiating test signals to generate a near-field radiation region within the testing fixture. The performance analysis device is used to electrically connect to the acoustic device. The testing fixture is further configured to fix the acoustic device within the near-field radiation region. The antenna is configured to radiate the test signal to form a radiating field on the acoustic device in the near-field radiation region; The performance analysis device is configured to obtain at least one electroacoustic performance parameter value of the acoustic device under the radiation field.

[0014] In one embodiment of the present invention, the test system further includes a signal generation module, which is independently located outside the test fixture. The antenna is electrically connected to the signal generation module, and the signal generation module is configured to generate the test signal and transmit it to the antenna.

[0015] In one embodiment of the present invention, the test system further includes a power meter, which is independently disposed outside the test fixture and electrically connected to the signal generation module. The power meter is configured to measure the real-time power value of the test signal.

[0016] In this technical solution, the near-field radiation immunity testing method, by employing a test fixture integrating a radiating antenna and performance analysis equipment, can solve the problem that near-field radiation from the antenna in devices such as TWS earphones interferes with microphone performance and makes it impossible to effectively assess the degree of interference. Specifically, this method fixes the acoustic device under test in a simulated near-field radiation area within the test fixture and controls the antenna radiation test signal within the fixture to form a controllable radiation field that closely approximates the internal environment of the actual product. Under this state, the performance analysis equipment acquires the output response of the device and calculates its electroacoustic performance parameters. This solution combines "test fixture simulating a compact spatial structure" with "built-in antenna generating a near-field radiation field" to realistically reproduce the physical scenario of interference generation, resulting in high-fidelity test conditions. Simultaneously, through "quantitative analysis of the output response by the performance analysis equipment," the performance parameter changes of the acoustic device under a specific radiation field can be directly and accurately measured. This achieves an objective and repeatable quantitative assessment of the internal near-field radiation immunity, providing reliable test data support for device selection and product anti-interference design. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of an embodiment of the testing system provided by the present invention; Figure 2 This is a first flowchart illustrating an embodiment of the test-free method provided by the present invention; Figure 3 This is a second flowchart illustrating an embodiment of the test-free method provided by the present invention; Figure 4 This is a third flowchart illustrating an embodiment of the test-free method provided by the present invention; Figure 5 This is a schematic diagram of the fourth process of an embodiment of the test-free method provided by the present invention; Figure 6 This is a fifth flowchart illustrating an embodiment of the test-free method provided by the present invention.

[0019] Explanation of icon numbers: 100. Testing system; 10. Signal generation module; 11. Vector signal generator; 12. Power amplifier; 20. Antenna; 30. Test fixtures; 31. Circuit boards; 40. Performance analysis equipment; 50. Power meter; 60. Shielding cover; 200. Acoustic devices.

[0020] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention 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 the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention 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 indication will also change accordingly.

[0023] Furthermore, the use of terms such as "first" and "second" in this invention 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 with "first" or "second" may explicitly or implicitly include at least one of those features. 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 where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0024] The main objective of this invention is to provide a near-field radiation immunity test method, which aims to test the acoustic performance of a microphone under near-field radiation interference.

[0025] To achieve the above objectives, the near-field radiated immunity testing method proposed in this invention is applied to a testing system 100. The testing system 100 is used to test the acoustic performance of an acoustic device 200. Please refer to [link to relevant documentation]. Figure 1 The test system 100 includes an antenna 20, a test fixture 30, and a performance analysis device 40. The antenna 20 is disposed in the test fixture 30 and is capable of radiating test signals within the test fixture 30 to generate a near-field radiation region. The performance analysis device 40 is used to electrically connect to the acoustic device 200. The test fixture 30 is also configured to fix the acoustic device 200 within the near-field radiation region. Please refer to [link to relevant documentation]. Figure 2 Near-field radiated immunity testing methods include: S10: Control the antenna 20 to radiate test signals to form a radiation field for the acoustic device 200 in the near-field radiation region; S20: Based on the radiation field formed by the test signal, control the performance analysis device 40 to obtain the output response of the acoustic device 200; S30: Based on the output response, the performance analysis device 40 obtains at least one electroacoustic performance parameter value of the acoustic device 200 under the radiation field.

[0026] First, it needs to be explained that the test fixture 30 of the test system 100 proposed in this invention includes at least one circuit board 31. The acoustic device 200 to be tested is fixed on the circuit board 31 by soldering. Electronic components such as sound sources and amplifiers can be set on the circuit board 31. The circuit board 31 can be connected to an external power source. When the circuit board 31 is connected to an external power source, the electronic components on the circuit board 31 are powered on. For example, the current passes through the amplifier, filter, etc. and is input to the sound source. The sound source emits sound, which is picked up by the acoustic device 200 to be tested, and thus outputs a corresponding output response. At the same time, the test fixture 30 has at least one connector. The antenna 20 can establish an electrical connection with external electrical devices through the connector, thereby radiating test signals in the test fixture 30, and forming a near-field radiation region inside the test fixture 30. The near-field radiation region refers to the spatial region within one wavelength of the radiating body of the antenna 20. In this region, the electromagnetic field is mainly an induced field, and its field strength changes drastically with distance, which can realistically simulate the near-field coupling interference of the internal antenna 20 of the electronic product to the adjacent acoustic device 200.

[0027] The test fixture 30 is a hollow structure, and its internal space is used to accommodate the antenna 20, the circuit board 31, and the acoustic device 200. The antenna 20 and the acoustic device 200 maintain a predetermined relative positional relationship in the test fixture 30. The relative positional relationship is set according to the assembly relationship of the product under test in actual application, including but not limited to geometric parameters such as the distance, angle, and orientation between the antenna 20 and the acoustic device 200, so as to simulate the relationship between the antenna 20 and the acoustic device 200 in the actual product.

[0028] The performance analysis device 40 is electrically connected to the acoustic device under test 200. Its core function is to measure and analyze the electrical signals output by the acoustic device 200. When the acoustic device under test 200 is a microphone, the performance analysis device 40 is preferably an audio analyzer. This audio analyzer is used to measure the voltage signal output by the microphone and calculate its electroacoustic performance parameters such as sensitivity, signal-to-noise ratio, and total harmonic distortion. When the acoustic device under test 200 is a loudspeaker, the performance analysis device 40 is preferably a combination of a measuring microphone and an audio analyzer. The measuring microphone is used to collect the sound signal emitted by the loudspeaker and convert it into an electrical signal. The audio analyzer analyzes this electrical signal and calculates the loudspeaker's output sound pressure level, sensitivity, total harmonic distortion, and other electroacoustic performance parameters.

[0029] Specifically, in step 10, the test signal is generated by an external device and transmitted to the test fixture 30 via a cable. The test fixture 30 is equipped with a connector that is electrically connected to the antenna 20, used to feed the externally input test signal to the antenna 20. After receiving the test signal, the antenna 20 converts it from guided electromagnetic waves into spatially radiated electromagnetic waves and radiates them into the internal space of the test fixture 30. Since the relative positional relationship between the antenna 20 and the acoustic device 200 within the test fixture 30 is predetermined based on their assembly relationship in the actual product, the distance between them is usually much smaller than the wavelength of the test signal. Therefore, the radiation field formed by the antenna 20 within the test fixture 30 is a near-field radiation field. This near-field radiation field forms a specific near-field radiation region within the test fixture 30, and the acoustic device 200 is fixed within this near-field radiation region. The test signal is a wireless communication radio frequency signal, which may include, but is not limited to, Bluetooth signals, Wi-Fi signals, Zigbee signals, or cellular communication signals. The frequency, modulation method, and other parameters of the test signal can be selected according to different test requirements to simulate the near-field radiation interference generated by different types of wireless communication modules on the adjacent acoustic device 200 in actual operation.

[0030] In step 20, under the condition that the radiation field formed by the radiated test signal from antenna 20 continues to exist, performance analysis equipment 40 begins to perform measurement operations on acoustic device 200. Performance analysis equipment 40 is electrically connected to the electrical output port of acoustic device 200 via a test cable to receive the electrical signal output by acoustic device 200 in its operating state. Acoustic device 200 is subjected to excitation conditions required for its normal operation in the radiation field. These excitation conditions include, but are not limited to, acoustic excitation or electrical excitation. Under the combined action of the excitation conditions and the radiation field, acoustic device 200 converts the received excitation signal into an electrical signal and outputs it from its electrical output port. Performance analysis equipment 40 acquires this electrical signal in real time, using it as the output response of acoustic device 200 under the current radiation field. The output response is an analog or digital electrical signal, and its waveform, amplitude, frequency components, and other characteristic information carry the operating state data of acoustic device 200 under the influence of the radiation field.

[0031] In step 30, the performance analysis device 40 performs signal processing and analysis on the acquired output response. Signal processing includes, but is not limited to, analog-to-digital conversion, time-domain analysis, frequency-domain analysis, and statistical calculation. According to a preset analysis algorithm, the performance analysis device 40 extracts characteristic quantities from the output response that characterize the electroacoustic conversion capability of the acoustic device 200. These characteristic quantities are quantified by the internal calculation unit of the performance analysis device 40 to generate electroacoustic performance parameter values ​​of the acoustic device 200 under the current radiation field. Electroacoustic performance parameter values ​​are quantitative indicators used to describe the conversion efficiency, linearity, fidelity, or purity of the acoustic device 200 when converting one form of energy to another. Electroacoustic performance parameter values ​​include, but are not limited to, sensitivity, signal-to-noise ratio, total harmonic distortion, and frequency response. These electroacoustic performance parameter values ​​directly reflect the degree to which the acoustic device 200 maintains its acoustic-to-electric or electro-acoustic conversion performance under specific intensity and type of near-field radio frequency radiation interference.

[0032] In one test scenario, the acoustic device under test (DUT) 200 is a microphone, specifically a MEMS microphone used in TWS earphones to pick up voice during calls. The test signal is a Bluetooth signal with a carrier frequency of 2.402 GHz to 2.480 GHz and a modulation scheme of GFSK (Gaussian Frequency Shift Keying). The performance analysis device 40 is an audio analyzer; the specific model is selected adaptably based on factors such as test accuracy and cost, and is not limited here. The DUT is soldered onto the circuit board 31 of the test fixture 30, and a miniature speaker is integrated as a standard sound source. This miniature speaker is used to apply a standard acoustic excitation signal to the DUT. An audio power amplifier is also provided on the circuit board 31 to drive the miniature speaker.

[0033] Before the test begins, the external vector signal generator 11 is electrically connected to the antenna 20 through the connector on the test fixture 30. The radiated power of the Bluetooth signal is calibrated and stabilized to a preset target power value through the closed-loop feedback system of the power meter 50 and the vector signal generator 11.

[0034] First testing method: Under the presence of a Bluetooth signal radiation field, the audio analyzer controls a miniature loudspeaker to apply an acoustic excitation signal with preset standard values ​​for both frequency and sound pressure level to the microphone under test. Under the combined effect of this acoustic excitation signal and the Bluetooth signal radiation field, the microphone under test converts the picked-up acoustic signal into an electrical signal and outputs it from its electrical output port. The audio analyzer collects this electrical signal through a test cable and performs frequency domain analysis, extracting the signal component amplitude at the preset standard frequency point. This signal component amplitude represents the actual output level of the microphone under test under the Bluetooth signal radiation field. The lower this actual output level, the weaker the microphone's response to the standard acoustic excitation signal under the current Bluetooth signal radiation field; that is, the greater the reduction in its ability to convert sound energy into electrical energy due to radiation, thus reflecting a weaker resistance to near-field radiation interference. Conversely, the higher the actual output level, the stronger the microphone's resistance to near-field radiation interference.

[0035] By setting different target power values ​​for Bluetooth signals and repeating the above test procedure, the actual output level of the microphone under different radiation intensities can be obtained, thereby enabling a complete quantitative evaluation of its ability to resist near-field radiation interference.

[0036] The second testing method: In the absence of Bluetooth signal radiation, the audio analyzer controls a miniature speaker to apply an acoustic excitation signal with preset standard values ​​for both frequency and sound pressure level to the microphone under test. The microphone under test converts this acoustic excitation signal into an electrical signal and outputs it to the audio analyzer. The audio analyzer performs frequency domain analysis on this electrical signal, extracts the signal component amplitude at the preset standard frequency point, and records this signal component amplitude as the theoretical output level of the microphone under test in the absence of interference.

[0037] Subsequently, while keeping the acoustic excitation signal completely unchanged, the vector signal generator 11 is turned on to generate a Bluetooth signal, which is then radiated to the microphone under test through the antenna 20 within the test fixture 30, forming a Bluetooth radiation field with a preset target power value in the near-field radiation region. While the Bluetooth radiation field continues to exist, the audio analyzer again collects the electrical signal output by the microphone under test and performs frequency domain analysis, extracting the signal component amplitude at a preset standard frequency point. This signal component amplitude is taken as the actual output level of the microphone under test under the Bluetooth radiation field.

[0038] The audio analyzer compares the actual output level with the theoretical output level and calculates the degree of difference between the two. The smaller the degree of difference, the less the microphone's response capability under the Bluetooth signal radiation field decreases compared to the theoretical response capability under interference-free conditions. In other words, the less its sound-to-electric conversion efficiency is affected by radiation, thus reflecting its stronger resistance to near-field radiation interference. Conversely, the larger the degree of difference, the weaker its resistance to near-field radiation interference.

[0039] By setting different target power values ​​for Bluetooth signals and repeating the above test procedure, the variation curve of the actual output level of the microphone relative to the theoretical output level under different radiation intensities can be obtained, thereby enabling a complete quantitative evaluation of its resistance to near-field radiation interference.

[0040] In another test scenario, the acoustic device under test 200 is a miniature speaker, specifically a dynamic speaker used in TWS earphones for playing audio. The test signal is a Wi-Fi signal operating at 2.4 GHz. The performance analysis device 40 includes a measuring microphone and an audio analyzer. The measuring microphone is used to collect the acoustic signal emitted by the speaker under test and convert it into an electrical signal, while the audio analyzer is used to analyze this electrical signal. The miniature speaker under test is soldered onto the circuit board 31 of the test fixture 30, which also includes an audio power amplifier. This audio power amplifier is used to input a standard audio electrical signal to the speaker under test. The measuring microphone is fixed to the front of the speaker under test using a special clamp to simulate the position of a human ear.

[0041] Before the test begins, the external vector signal generator 11 is electrically connected to the antenna 20 through the RF connector on the test fixture 30. The radiated power of the Wi-Fi signal is calibrated and stabilized to a preset target power value through the closed-loop feedback system of the power meter 50 and the vector signal generator 11.

[0042] First testing method: Under the condition of a Wi-Fi signal radiation field, an audio analyzer inputs an audio electrical signal with preset standard values ​​for frequency and voltage to the micro-speaker under test (MSB) via an audio power amplifier. Under the combined influence of this audio electrical signal and the Wi-Fi signal radiation field, the MSB converts the received electrical signal into a sound signal and radiates it outwards. A measuring microphone collects this sound signal and converts it back into an electrical signal. The audio analyzer performs frequency domain analysis on this electrical signal, extracting the amplitude of the fundamental wave signal component and its harmonic signal components at the preset standard frequency point. Based on the proportional relationship between the amplitudes of the fundamental wave signal component and the harmonic signal components, the audio analyzer calculates the actual output purity of the MSB under the current Wi-Fi signal radiation field. The lower the actual output purity, the more nonlinear distortion components are generated during the conversion of electrical energy into sound energy by the micro-speaker under the current Wi-Fi signal radiation field. The greater the degree to which the linearity of its electro-acoustic conversion is degraded by radiation, thus reflecting a weaker resistance to near-field radiation interference. Conversely, the higher the actual output purity, the stronger its resistance to near-field radiation interference.

[0043] By setting different Wi-Fi signal target power values, carrier frequencies, or modulation methods and repeating the above test procedure, the actual output purity variation trend of the miniature speaker under different radiation conditions can be obtained, thereby enabling a complete quantitative evaluation of its resistance to near-field radiation interference.

[0044] The second testing method: Under conditions of no Wi-Fi signal radiation, the audio analyzer inputs an audio electrical signal with preset standard values ​​for frequency and voltage level to the micro-speaker under test via an audio power amplifier. The micro-speaker under test converts this audio electrical signal into a sound signal and radiates it outwards. The measuring microphone collects this sound signal and converts it into an electrical signal. The audio analyzer performs frequency domain analysis on this electrical signal, extracts the amplitude of the fundamental signal component and its harmonic signal components at the preset standard frequency point, and calculates and records the theoretical output purity of the micro-speaker under test in an interference-free state based on the proportional relationship between the two.

[0045] Subsequently, while keeping the audio electrical signal completely unchanged, the vector signal generator 11 is turned on to generate a Wi-Fi signal, which is then radiated through the antenna 20 within the test fixture 30 to the miniature speaker under test, forming a Wi-Fi radiation field with a preset target power value in the near-field radiation region. While the Wi-Fi radiation field persists, the measuring microphone again collects the acoustic signal output by the miniature speaker under test and converts it into an electrical signal. The audio analyzer performs frequency domain analysis on this electrical signal to calculate the actual output purity of the miniature speaker under test under the Wi-Fi radiation field.

[0046] The audio analyzer compares the actual output purity with the theoretical output purity and calculates the degree of difference between the two. The smaller the difference, the less the output purity of the miniature speaker decreases under Wi-Fi signal radiation fields compared to the theoretical output purity in the interference-free state. In other words, the less its electro-acoustic conversion linearity is degraded by radiation, thus reflecting its stronger resistance to near-field radiation interference. Conversely, the larger the difference, the weaker its resistance to near-field radiation interference.

[0047] By setting different Wi-Fi signal target power values, carrier frequencies, or modulation methods and repeating the above test procedure, the variation curve of the actual output purity of the miniature speaker relative to the theoretical output purity under different radiation conditions can be obtained, thereby enabling a complete quantitative evaluation of its resistance to near-field radiation interference.

[0048] In this technical solution, the near-field radiation immunity test method, by using a test fixture 30 that integrates a radiating antenna 20 and a performance analysis device 40, can solve the problem that the near-field radiation of the antenna 20 interferes with the microphone performance due to the high integration of devices such as TWS earphones, and the degree of interference cannot be effectively evaluated. Specifically, this method fixes the acoustic device under test 200 within a simulated near-field radiation region inside a test fixture 30, and controls the antenna 20 within the fixture to radiate test signals to form a controllable radiation field that closely approximates the internal environment of the actual product. Under these conditions, the performance analysis device 40 acquires the device's output response and calculates its electroacoustic performance parameters. This approach combines "the test fixture 30 simulating a compact spatial structure" with "the built-in antenna 20 generating a near-field radiation field," realistically reproducing the physical scenario of interference generation and ensuring high fidelity in the test conditions. Simultaneously, through "quantitative analysis of the output response by the performance analysis device 40," the performance parameter changes of the acoustic device 200 under a specific radiation field can be directly and accurately measured. This achieves an objective and repeatable quantitative assessment of the internal near-field radiation immunity, providing reliable test data support for device selection and product anti-interference design.

[0049] In one embodiment of the present invention, the test system 100 further includes a signal generation module 10, which is independently disposed outside the test fixture 30. The antenna 20 is electrically connected to the signal generation module 10. Please refer to [link to relevant documentation]. Figure 3 Step 10 includes: S110: Control signal generation module 10 generates a test signal; S120: Feed the test signal to antenna 20 so that it is radiated by antenna 20 and forms a radiation field in the near-field radiation region.

[0050] In this embodiment, the signal generation module 10 is a vector signal generator 11. The vector signal generator 11 is an instrument capable of generating various analog and digital modulation signals. Depending on the different analog and modulation methods, the vector signal generator 11 can transmit at least Bluetooth signals and Wi-Fi signals. Thus, different types of test signals can be switched based on manual or automatic control. When the antenna 20 is electrically connected to the vector signal generator 11, the antenna 20 can transmit different types of test signals to test the acoustic performance of the acoustic device 200 under different radiation fields, such as sensitivity, signal-to-noise ratio, etc.

[0051] Specifically, in step 110, the control computer of the test system 100 or the operator sends a control command to the signal generation module 10. The signal generation module 10 is a vector signal generator 11, which is an electronic measuring instrument capable of generating various analog or digital modulated radio frequency signals according to preset parameters. The control command includes at least parameter information such as signal type, carrier frequency, modulation method, output power, and signal bandwidth. After receiving the control command, the vector signal generator 11 generates the corresponding baseband waveform in its internal baseband signal processing unit according to the command parameters. After processing through a signal chain such as quadrature modulation, up-conversion, and power amplification, it generates a test signal conforming to preset specifications from its radio frequency output port. The test signal includes, but is not limited to, Bluetooth signals and Wi-Fi signals. By changing the signal type parameter in the control command, the type of test signal can be switched manually or automatically, thereby enabling the test system 100 to simulate the near-field radiation interference generated by different types of wireless communication modules on the acoustic device 200 in actual operation.

[0052] In step 120, the test signal is fed to the antenna 20 through the connector on the test fixture 30, so that the antenna 20 radiates and forms a radiation field in the near-field radiation region. One end of the connector is connected to the output port of the vector signal generator 11 via an RF transmission cable, and the other end is connected to a preset RF connector on the test fixture 30 to form a complete signal transmission path. The test signal enters the antenna 20 through the RF transmission cable and RF connector. The antenna 20 converts the received guided electromagnetic wave into a spatially radiated electromagnetic wave and radiates it into the internal space of the test fixture 30. Since the relative positional relationship between the antenna 20 and the acoustic device 200 within the test fixture 30 is preset according to the assembly relationship between the two in the actual product, the distance between them is much smaller than the wavelength of the test signal. Therefore, the radiation field formed by the antenna 20 within the test fixture 30 is a near-field radiation field. This near-field radiation field defines a specific near-field radiation region inside the test fixture 30. The acoustic device 200 is fixed within this near-field radiation region, thereby being directly exposed to the electromagnetic field radiated by the antenna 20. By switching the type of test signal through the vector signal generator 11, the antenna 20 can radiate different types of radio frequency signals in sequence without changing the hardware, thereby forming multiple radiation fields corresponding to different wireless communication standards in the near-field radiation area, providing a repeatable and quantifiable test environment for evaluating the acoustic performance of the acoustic device 200 under different types of near-field radiated interference.

[0053] In one embodiment of the present invention, the test system 100 further includes a power meter 50, which is independently disposed outside the test fixture 30 and electrically connected to the signal generation module 10. (See also...) Figure 4 Before step 110, the following are also included: S1: Obtain the real-time power value of the test signal measured by power meter 50; S2: Based on the real-time power value and the target power value of the test signal, adjust the output of the signal generation module 10 so that the real-time power value of the test signal generated by the signal generation module 10 reaches the target power value.

[0054] In this embodiment, the signal generation module 10 further includes a power amplifier 12, which is connected to the output port of the vector signal generator 11. The power amplifier 12 splits the test signal generated by the signal generation module 10 into two parts. The power meter 50 and the antenna 20 are respectively connected to the first output port and the first output port of the power amplifier 12. Thus, the signal power obtained by the power meter 50 is the actual power of the test signal.

[0055] Specifically, in step 1, the signal generation module 10 includes a vector signal generator 11 and a power amplifier 12. The output port of the vector signal generator 11 is electrically connected to the input port of the power amplifier 12. The power amplifier 12 amplifies the received test signal and outputs it through its first and second output ports, respectively. The first output port of the power amplifier 12 is electrically connected to a connector on the test fixture 30 to feed the amplified test signal to the antenna 20; the second output port of the power amplifier 12 is electrically connected to the input port of the power meter 50. The power meter 50 is an RF power measuring instrument that can measure the carrier power of the input signal in real time and accurately. When the vector signal generator 11 generates a test signal and amplifies it through the power amplifier 12, the power meter 50 can receive the test signal in real time through its connection with the power amplifier 12, and detect and quantize the power level of the test signal to obtain the real-time power value of the test signal. This real-time power value is the actual power of the test signal fed to the antenna 20 in the current state.

[0056] In step 2, the tester can pre-set one or a set of target power values. These target power values ​​can be used to simulate the multi-power operation scenario of the Bluetooth or Wi-Fi module during actual operation of the acoustic device, depending on the test requirements. The power meter 50 can feed back the real-time power value it measures to the vector signal generator 11 in the form of an analog voltage signal or a digital communication protocol. The control unit inside the vector signal generator 11 receives the feedback signal and compares it with the target power value to calculate the deviation between the two. Based on this deviation, the vector signal generator 11 dynamically adjusts its internal baseband signal gain or output attenuator setting, thereby changing the signal power of its RF output port. This adjustment process continues until the deviation between the real-time power value fed back by the power meter 50 and the target power value is less than a preset tolerance range. At this point, the output power of the vector signal generator 11 stabilizes at the target power value. Through this closed-loop feedback adjustment mechanism, the test system 100 can establish an accurate, stable, and repeatable test signal power reference at the radiation port of the antenna 20, ensuring the consistency of conditions and the comparability of results for subsequent acoustic device 200 immunity tests.

[0057] In some embodiments of the present invention, the test signal is a Bluetooth signal, which is a short-range wireless communication radio frequency signal operating in the 2.4 GHz band. It employs frequency-hopping spread spectrum technology, hopping at a rate of 1600 hops per second on 79 or 40 channels, supporting multiple operating modes such as basic rate, enhanced data rate, and low power consumption. The selection of a Bluetooth signal as the test signal is a targeted choice based on the technical problem to be solved by the present invention—namely, the near-field radiation interference of the Bluetooth antenna 20 inside miniaturized electronic devices such as TWS earphones to nearby acoustic devices such as microphones 200. By setting the test signal to a Bluetooth signal, the radiation field formed by the antenna 20 in the near-field radiation region can realistically reproduce the radio frequency radiation characteristics of the Bluetooth module in actual operation, including its carrier frequency range, frequency hopping pattern, modulation method, and data packet structure. The power of the Bluetooth signal can be precisely set within a wide dynamic range according to test requirements to simulate the interference intensity of the Bluetooth module to nearby acoustic devices 200 at different transmission power levels. By specifying the test signal as a Bluetooth signal, the test method provided by this invention can specifically solve the internal radio frequency radiation interference problem faced by Bluetooth audio devices such as TWS earphones in practical applications, and provide a direct and effective test and verification means for the selection of acoustic components, optimization of circuit layout and electromagnetic compatibility design of Bluetooth devices.

[0058] In one embodiment of the present invention, the electroacoustic performance parameter value is the sensitivity parameter value of the acoustic device 200. The sensitivity parameter value is a core electroacoustic performance indicator describing the energy conversion efficiency of the acoustic device 200, and its physical meaning characterizes the output response amplitude that the acoustic device 200 can produce under a unit input excitation. For different types of acoustic devices 200, the specific definition and measurement method of the sensitivity parameter value are different, but their essence reflects the conversion efficiency of the acoustic device 200 in converting one form of energy into another. When the acoustic device 200 is a microphone, the sensitivity parameter is defined as the ratio of the open-circuit voltage generated at the microphone output to the input sound pressure under the action of a standard acoustic excitation signal. Its unit is usually millivolts per pascal or decibel volts per pascal. The higher the parameter value, the stronger the microphone's ability to pick up sound signals. When the acoustic device 200 is a loudspeaker, the sensitivity parameter is defined as the ratio of the sound pressure level generated by the loudspeaker at a reference position to the input electrical power or input voltage under the excitation of a standard audio electrical signal. Its unit is usually decibel sound pressure level per watt per meter or decibel sound pressure level per volt per meter. The higher the parameter value, the higher the electro-acoustic conversion efficiency of the loudspeaker. In the testing method provided by this invention, the performance analysis device 40 acquires the output response of the acoustic device 200 in the presence of a radiation field, and calculates the actual sensitivity parameter value of the acoustic device 200 under the current radiation field based on the output response. The actual sensitivity parameter value directly quantifies the degree to which the energy conversion efficiency of the acoustic device 200 is maintained under near-field radiation interference. The smaller the deviation of the actual sensitivity parameter value from the theoretical sensitivity parameter value in the absence of a radiation field, the less the energy conversion efficiency of the acoustic device 200 is affected by near-field radiation interference, i.e., the stronger its resistance to near-field radiation interference. Conversely, the larger the deviation of the actual sensitivity parameter value from the theoretical sensitivity parameter value, the more significant the impact of near-field radiation interference on its energy conversion efficiency, i.e., the weaker its resistance to near-field radiation interference. By specifying the electroacoustic performance parameter value as a sensitivity parameter value, the testing method provided by this invention can directly evaluate the degree of influence of near-field radiation interference on the basic transduction function of the acoustic device 200 in a standardized and quantifiable manner, providing a clear and intuitive basis for evaluating the anti-interference performance of the acoustic device 200.

[0059] In one embodiment of the present invention, the acoustic device 200 is a microphone; please refer to [link / reference needed]. Figure 5 Step 20 includes: S21: Input excitation signal to microphone; S22: Control performance analysis device 40 acquires the electrical signal output by the microphone under excitation signal and radiation field, and the electrical signal is used as the output response.

[0060] In step 21, a standard sound source, which is a miniature loudspeaker or acoustic coupler, is mounted on the circuit board 31 of the test fixture 30. This standard sound source converts electrical signals into stable, repeatable acoustic signals. The standard sound source and the microphone maintain a fixed relative position within the test fixture 30 to ensure that the microphone's acoustic receiving port can accurately pick up the sound waves radiated by the standard sound source. The excitation signal is a pure acoustic signal with a preset frequency and a preset sound pressure level. Its frequency and sound pressure level can be adaptively set according to actual use, thereby reproducing the microphone's actual working scenario. After receiving an external driving signal, the standard sound source continuously radiates this acoustic excitation signal to the microphone. This excitation signal serves as the reference input for measuring the microphone's electroacoustic conversion function, and its parameters remain constant throughout the test to ensure that changes in the microphone's output response are solely due to the influence of the radiation field.

[0061] In step 22, while the microphone continuously receives the acoustic excitation signal radiated by the standard sound source at its acoustic receiving port, its sensitive circuit and diaphragm are also within the near-field radiation field formed by the antenna 20. The microphone converts the picked-up acoustic signal into an analog voltage signal and continuously outputs the voltage signal from its electrical output port. The performance analysis device 40 is electrically connected to the microphone's electrical output port via a test cable to receive the voltage signal. The performance analysis device 40 collects the waveform, amplitude, and frequency components of the voltage signal in real time, and records the collected complete electrical signal data as the microphone's output response under the current radiation field. This output response is the basic data for subsequent calculation of the microphone's electroacoustic performance parameters, carrying real-time status information of the microphone's sound-to-electric conversion function under the influence of the radiation field.

[0062] In one embodiment of the present invention, please refer to Figure 6 Step 30 includes: S31: Control performance analysis equipment 40 performs frequency domain analysis on the output response to obtain the signal component amplitude under the excitation signal; S32: Based on the signal component amplitude, obtain the microphone's sensitivity parameter value under the radiation field.

[0063] In step 31, the performance analysis device 40 first converts the acquired analog voltage signal into a digital signal sequence using an analog-to-digital converter. This digital signal sequence is then fed into the frequency domain analysis module of the performance analysis device 40. This module uses a Fast Fourier Transform algorithm to convert the time-domain signal to the frequency domain, thereby obtaining the amplitude distribution spectrum of the output response on the frequency axis. In the amplitude distribution spectrum, the performance analysis device 40 identifies and locates the spectral components at a preset excitation signal frequency. The performance analysis device 40 reads the amplitude value corresponding to this frequency point. This amplitude value is quantized in terms of effective voltage or decibel-volt (dV), representing the amplitude of the signal component generated by the microphone in response to the standard acoustic excitation signal under the current radiation field. Through frequency domain analysis, the performance analysis device 40 can effectively eliminate other interfering frequency components that may be introduced by the radiation field in the audio frequency band, ensuring that the extracted signal component amplitude only reflects the microphone's response intensity to the excitation signal.

[0064] In step 32, the performance analysis device 40 performs calculations on the signal component amplitude obtained in step S31 and the known sound pressure level value. When the signal component amplitude is expressed as an effective voltage value, the performance analysis device 40 divides it by the sound pressure level of the excitation signal to calculate a linear sensitivity value in millivolts per pascal; when the signal component amplitude is expressed as decibels per volt, the performance analysis device 40 performs a differential operation with the sound pressure level of the excitation signal to calculate a logarithmic sensitivity value in decibels per pascal. The calculated value is the actual sensitivity parameter value of the microphone under the radiation field. The actual sensitivity parameter value directly quantifies the instantaneous conversion efficiency of the microphone in converting the acoustic signal it picks up into an electrical signal in the current near-field radiated interference environment, and is a basis for evaluating the degree to which the microphone retains its acoustic-electrical transduction function under specific radiation conditions.

[0065] The present invention also proposes a testing system 100 for testing the acoustic performance of an acoustic device 200. (See also...) Figure 1 The test system 100 includes an antenna 20, a test fixture 30, and a performance analysis device 40. The antenna 20 is located in the test fixture 30 and is able to radiate test signals in the test fixture 30 to generate a near-field radiation region. The performance analysis device 40 is used to electrically connect the acoustic device 200. The test fixture 30 is also configured to fix the acoustic device 200 in the near-field radiation region. Antenna 20 is configured to radiate a test signal to form a radiated field on acoustic device 200 in the near-field radiation region; The performance analysis device 40 is configured to obtain at least one electroacoustic performance parameter value of the acoustic device 200 under a radiation field.

[0066] In some embodiments, the test system 100 adopts a modular configuration, in which each component device is an independent instrument, and they are electrically connected to each other through test cables and radio frequency cables. In this case, the main operator of the test system 100 is the test personnel, and the working status control and data interaction of each device are all completed manually by the test personnel.

[0067] Specifically, antenna 20 is connected to an external signal source device via an RF connector on test fixture 30 and an RF cable. This external signal source device can be a vector signal generator 11 or other types of RF signal generating devices. The tester controls whether the signal source device feeds a test signal to antenna 20 by pressing the RF output switch on its front panel, thus controlling the radiation and shutdown of the test signal by antenna 20. Performance analysis device 40 is electrically connected to the electrical output port of the acoustic device under test 200 via a test cable. The tester controls the performance analysis device 40 to begin acquiring the output response of acoustic device 200 and performing calculations and analysis of electroacoustic performance parameters by pressing the measurement start button on its front panel. The operating state of the circuit board 31 inside test fixture 30 is also controlled by the tester via an external power switch. When the tester closes the power switch, the sound source components and signal processing components on circuit board 31 are powered on, applying a standard acoustic excitation signal to the acoustic device under test 200; when the tester disconnects the power switch, the excitation signal terminates.

[0068] In terms of data interaction, testers read the current output power reading displayed on the signal source device's screen and manually compare it with the preset target power value. They then manually rotate the power adjustment knob of the signal source device until the output power reaches the expected set value. Testers read the electroacoustic performance parameter values ​​displayed on the performance analysis device 40's screen and record them in a paper or electronic test record sheet for subsequent manual evaluation and judgment of the acoustic device 200's resistance to near-field radiation interference.

[0069] This modular system implementation has advantages such as flexible configuration, high degree of freedom in equipment selection, and the ability of a single device to be used independently for other testing tasks. It is suitable for verification testing and small-batch sample sampling scenarios in the R&D stage.

[0070] In some other embodiments, the test system 100 further includes a control unit, which is electrically connected via a control bus to the signal generation module 10, the power meter 50, the performance analysis device 40, and the circuit board 31 within the test fixture 30. The control unit can be an industrial control computer, an embedded controller, or a programmable logic controller, and it stores computer-executable instructions internally. When the instructions are executed, the control unit automatically executes the entire process of the near-field radiated immunity test method.

[0071] Specifically, the control unit first sends a first control command to the signal generation module 10 via the control bus. The first control command includes parameter information such as the test signal type, carrier frequency, modulation method, and initial output power. The signal generation module 10 generates a corresponding test signal according to the first control command and feeds it to the antenna 20. The power meter 50 measures the current power value of the test signal in real time and feeds back the real-time power value to the control unit via the control bus using a digital communication protocol. The control unit compares the received real-time power value with the target power value pre-stored in its internal memory, calculates the deviation between the two, and sends a second control command to the signal generation module 10 based on the deviation to dynamically adjust its output power until the deviation between the real-time power value and the target power value is less than a preset tolerance threshold.

[0072] After the test signal power stabilizes at the target power value, the control unit sends a third control command to the circuit board 31 within the test fixture 30 via the control bus. This third control command activates the sound source element on the circuit board 31, causing it to apply a standard acoustic excitation signal with a preset frequency and preset sound pressure level to the acoustic device under test 200. Simultaneously, the control unit sends a fourth control command to the performance analysis device 40 via the control bus. This fourth control command activates the signal acquisition and analysis function of the performance analysis device 40. Under the condition that the radiation field and the excitation signal coexist, the performance analysis device 40 automatically acquires the output response electrical signal of the acoustic device 200 and performs a series of signal processing operations, including analog-to-digital conversion, fast Fourier transform, spectral component extraction, and electroacoustic performance parameter calculation. The calculated electroacoustic performance parameter values ​​are transmitted back to the control unit by the performance analysis device 40 via the control bus. The control unit automatically stores these parameter values ​​in its internal memory or external database and automatically generates an evaluation conclusion on the acoustic device 200's resistance to near-field radiation interference based on preset judgment logic.

[0073] Understandably, the control unit can also automatically modify test parameters such as target power value, test signal type, carrier frequency, and modulation method according to the preset test sequence, and repeat the above test process, so as to continuously and automatically complete the complete evaluation of the near-field radiation interference resistance of the acoustic device 200 under multiple test conditions without the need for test personnel to be on duty.

[0074] This automated system offers advantages such as high testing efficiency, excellent operational consistency, low human error, and support for batch testing and complex test sequences. It is suitable for verification testing in the later stages of product development, quality sampling inspection in the mass production stage, and consistency monitoring scenarios.

[0075] Furthermore, the test system 100 also includes a signal generation module 10, which is independently located outside the test fixture 30. The antenna 20 is electrically connected to the signal generation module 10. The signal generation module 10 is configured to generate test signals and transmit them to the antenna 20. Specifically, the signal generation module 10 is an independent radio frequency signal source device, which is physically separated from the test fixture 30. The two are only electrically connected through a pluggable radio frequency cable. The arrangement of the signal generation module 10 being independently located outside the test fixture 30 has at least the following advantages: First, it avoids the electromagnetic radiation, thermal radiation, and mechanical vibration generated by the signal generation module 10 itself during operation from causing additional interference to the near-field radiation environment and acoustic measurement environment inside the test fixture 30, ensuring that the radiation field is formed only by the test signal radiated by the antenna 20, thus guaranteeing the purity of the test conditions; Second, it facilitates the flexible replacement or upgrading of the signal generation module 10 according to different test requirements. For example, when it is necessary to test different frequency bands and different standards of radio frequency signals, a vector signal generator 11 of the corresponding specification or other types of radio frequency signal sources can be quickly connected; Third, placing the high-power, high-heat signal generation module 10 outside the shielded test fixture 30 helps to improve the temperature stability inside the test fixture 30 and avoids thermal drift affecting the electroacoustic performance measurement results of the acoustic device 200.

[0076] The type of signal generation module 10 can be selected according to testing requirements. In one embodiment of the present invention, the signal generation module 10 is a vector signal generator 11, which can generate radio frequency test signals of various standards and modulation methods, including Bluetooth signals, Wi-Fi signals, Zigbee signals, and cellular communication signals. In another embodiment of the present invention, the signal generation module 10 is a combination of a signal generator and a power amplifier, with the power amplifier connected between the signal generator and the antenna 20 to increase the power level of the test signal to meet the requirements of high field strength radiation immunity testing. In yet another embodiment of the present invention, the signal generation module 10 is a radio frequency signal recorder and playback device, which can store real electromagnetic environment signals collected in the field and accurately play them back in the laboratory, thereby simulating the complex and non-ideal radiation interference environment in actual use scenarios.

[0077] Furthermore, the test system 100 also includes a power meter 50, which is independently located outside the test fixture 30 and electrically connected to the signal generation module 10. The power meter 50 is configured to measure the real-time power value of the test signal. The power meter 50 is an RF power measuring instrument, which is physically separated from the test fixture 30. There is no direct mechanical connection between the two; they are only electrically connected to the signal generation module 10 through an RF cable. This layout, which is independently located outside the test fixture 30, has the following advantages: First, it avoids the electromagnetic and thermal radiation generated by the power meter 50 during its operation from causing additional interference to the near-field radiation environment and acoustic measurement environment inside the test fixture 30, ensuring the purity and stability of the radiation field. Second, as an independent calibration device, the power meter 50 can be periodically traced to higher-level metrological standards, ensuring the accuracy and traceability of its power measurement values. Third, the independently located power meter 50 can be connected or disconnected at any time without interrupting the test link, facilitating the flexible configuration and maintenance of the test system 100.

[0078] In one embodiment of the present invention, the signal generation module 10 includes a vector signal generator 11 and a power amplifier 12. The input port of the power amplifier 12 is electrically connected to the RF output port of the vector signal generator 11, the first output port of the power amplifier 12 is electrically connected to the antenna 20, and the second output port of the power amplifier 12 is electrically connected to the input port of the power meter 50. The power amplifier 12 amplifies the power of the received test signal and outputs it from the first output port and the second output port respectively according to a preset power division ratio. The power meter 50 obtains the split sample of the test signal through the second output port of the power amplifier 12, thereby obtaining the actual power value of the test signal at the feed port of the antenna 20. This actual power value is the real-time power level of the test signal fed to the antenna 20 in the current state.

[0079] Of course, to isolate external electromagnetic radiation from interfering with the radiation inside the test fixture 30, the test system 100 also includes a shielding cover 60. The test fixture 30 is located inside the shielding cover 60, which is configured to block external electromagnetic radiation from entering the interior of the test fixture 30, thereby ensuring the purity and controllability of the radiation field in the near-field radiation region. It is understood that the shielding cover 60 is an electromagnetic shielding shell made of highly conductive materials, including but not limited to galvanized steel plates, copper plates, aluminum plates, or conductive composite materials. The inner wall of the shielding cover 60 may also optionally be covered with electromagnetic wave absorbing material to suppress secondary reflections from the inner wall of the cover and prevent reflected waves from interfering with the near-field radiation field distribution inside the test fixture 30. The shielding cover 60 is provided with wiring holes, through which the antenna 20 in the test fixture 30 and the acoustic device 200 under test are electrically connected to the signal generation module 10, performance analysis equipment 40, and external power supply located outside the shielding cover 60.

[0080] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A near-field radiated immunity testing method, wherein the near-field radiated immunity testing method is applied to a test system (100), the test system (100) being used to test the acoustic performance of an acoustic device (200), characterized in that, The test system (100) includes an antenna (20), a test fixture (30), and a performance analysis device (40). The antenna (20) is disposed in the test fixture (30) and is capable of radiating test signals in the test fixture (30) to generate a near-field radiation region. The performance analysis device (40) is used to electrically connect the acoustic device (200). The test fixture (30) is also configured to fix the acoustic device (200) in the near-field radiation region. The near-field radiation immunity test method includes: The antenna (20) is controlled to radiate the test signal to form a radiation field on the acoustic device (200) in the near-field radiation region; Based on the radiation field formed by the test signal, the performance analysis device (40) is controlled to obtain the output response of the acoustic device (200); Based on the output response, the performance analysis device (40) obtains at least one electroacoustic performance parameter value of the acoustic device (200) under the radiation field.

2. The near-field radiated immunity test method as described in claim 1, characterized in that, The test system (100) further includes a signal generation module (10), which is independently located outside the test fixture (30). The antenna (20) is electrically connected to the signal generation module (10). The step of controlling the antenna (20) to radiate the test signal to form a radiation field for the acoustic device (200) in the near-field radiation region includes: The signal generation module (10) is controlled to generate the test signal; The test signal is fed to the antenna (20) so that it is radiated by the antenna (20) and forms the radiation field in the near-field radiation region.

3. The near-field radiation immunity test method as described in claim 2, characterized in that, The test system (100) further includes a power meter (50), which is independently located outside the test fixture (30) and electrically connected to the signal generation module (10). Before the step of controlling the signal generation module (10) to generate the test signal, the system further includes: The power meter (50) measures the real-time power value of the test signal; Based on the real-time power value and the target power value of the test signal, the output of the signal generation module (10) is adjusted so that the real-time power value of the test signal generated by the signal generation module (10) reaches the target power value.

4. The near-field radiated immunity test method as described in any one of claims 1 to 3, characterized in that, The test signal is a Bluetooth signal.

5. The near-field radiation immunity test method as described in claim 4, characterized in that, The electroacoustic performance parameter value is the sensitivity parameter value of the acoustic device (200).

6. The near-field radiated immunity test method as described in claim 5, characterized in that, The acoustic device (200) is a microphone, and the step of controlling the performance analysis device (40) to acquire the output response of the acoustic device (200) includes: An excitation signal is input to the microphone; The performance analysis device (40) is controlled to acquire the electrical signal output by the microphone under the excitation signal and the radiation field, and the electrical signal is used as the output response.

7. The near-field radiated immunity test method as described in claim 6, characterized in that, The step of the performance analysis device (40) obtaining at least one electroacoustic performance parameter value of the acoustic device (200) under the radiation field based on the output response includes: The performance analysis device (40) is controlled to perform frequency domain analysis on the output response to obtain the signal component amplitude under the excitation signal; Based on the amplitude of the signal components, the sensitivity parameter value of the microphone under the radiation field is obtained.

8. A testing system for testing the acoustic performance of an acoustic device (200), characterized in that, The test system (100) includes an antenna (20), a test fixture (30), and a performance analysis device (40). The antenna (20) is disposed in the test fixture (30) and is able to radiate test signals in the test fixture (30) to generate a near-field radiation region. The performance analysis device (40) is used to electrically connect the acoustic device (200). The test fixture (30) is also configured to fix the acoustic device (200) in the near-field radiation region. The antenna (20) is configured to radiate the test signal to form a radiation field on the acoustic device (200) in the near-field radiation region; The performance analysis device (40) is configured to obtain at least one electroacoustic performance parameter value of the acoustic device (200) under the radiation field.

9. The test system (100) as described in claim 8, characterized in that, The test system (100) further includes a signal generation module (10), which is independently located outside the test fixture (30). The antenna (20) is electrically connected to the signal generation module (10), and the signal generation module (10) is configured to generate the test signal and transmit it to the antenna (20).

10. The test system (100) as described in claim 9, characterized in that, The test system (100) also includes a power meter (50), which is independently located outside the test fixture (30) and electrically connected to the signal generation module (10). The power meter (50) is configured to measure the real-time power value of the test signal.

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