Methods, systems and related devices for testing natural frequencies

Abstract

This application provides a method, system, and related apparatus for testing natural frequencies, relating to the field of audio testing. The method includes: acquiring the vibration acceleration signal and surface acoustic pressure signal of the audio device under test under non-contact excitation; and determining the natural frequency of the audio device based on the surface acoustic pressure signal and vibration acceleration signal. Compared to traditional closed-space sound pressure adjustment methods, this application simplifies the operation process by acquiring the vibration acceleration signal and surface acoustic pressure signal of the audio device under test under non-contact excitation. It eliminates the need to analyze the sound pressure at each test frequency point individually; the natural frequency of the audio device under test can be determined directly by analyzing the vibration acceleration signal and surface acoustic pressure signal. Furthermore, the non-contact method reduces the risk of physical contact with the audio device under test, thereby minimizing the possibility of damage.

Description

Technical Field

[0001] This application relates to the field of audio testing, and more particularly to a method, system and apparatus for testing inherent frequencies. Background Technology

[0002] Audio devices are widely used in modern life, and their performance and quality directly impact the user experience. Acoustic design is a crucial aspect of audio device development. Inadequate acoustic design can lead to abnormal vibrations in audio devices, affecting sound quality and stability. Natural frequency testing helps detect and evaluate the vibration of audio devices, assisting engineers in locating and resolving vibration problems at specific frequencies. Therefore, accurately determining the natural frequencies of audio devices is particularly important for addressing abnormal vibration issues.

[0003] Currently, common methods for testing natural frequencies are based on the hammer impact method and the vibrator method. These methods apply a large force to the device under test, causing it to vibrate, and the natural frequency is obtained by analyzing the vibration. However, applying these natural frequency testing methods to audio equipment can damage the equipment.

[0004] Therefore, there is an urgent need to provide a testing scheme suitable for the inherent frequencies of audio devices. Summary of the Invention

[0005] This application provides a method, system, and related apparatus for testing inherent frequencies, in order to reduce the possibility of damage to audio equipment.

[0006] Firstly, this application provides a method for testing inherent frequencies, comprising:

[0007] Acquire the vibration acceleration signal and surface acoustic pressure signal of the audio device under test under non-contact excitation;

[0008] The natural frequency of the audio device is determined based on the surface acoustic pressure signal and the vibration acceleration signal.

[0009] In one possible implementation, determining the natural frequency of the audio device based on surface acoustic pressure signals and vibration acceleration signals includes:

[0010] Spectral analysis of the surface acoustic pressure signal is performed to obtain the acoustic pressure spectrum corresponding to the surface acoustic pressure signal;

[0011] Spectral analysis is performed on the vibration acceleration signal to obtain the acceleration spectrum of the vibration acceleration signal;

[0012] Determine the frequency response function of the audio device based on the sound pressure spectrum and acceleration spectrum;

[0013] The inherent frequency of the audio device is obtained based on the frequency response function.

[0014] In one possible implementation, determining the frequency response function of the audio device based on the sound pressure spectrum and acceleration spectrum includes:

[0015] The frequency response function is determined to be the result of dividing the acceleration spectrum by the sound pressure spectrum.

[0016] In one possible implementation, obtaining the inherent frequency of the audio device based on the frequency response function includes:

[0017] Perform spectral analysis on the frequency response function to identify frequencies with peak amplitude;

[0018] The frequency with peak amplitude is determined as the inherent frequency of the audio device.

[0019] In one possible implementation, non-contact excitation includes sound pressure excitation.

[0020] In one possible implementation, before acquiring the vibration acceleration signal and surface acoustic pressure signal of the audio device under non-contact excitation, the method further includes:

[0021] The control outputs a sweep frequency signal, which is used to excite the sound source device to generate and output a sound pressure signal. The sound pressure signal is used to excite the audio equipment to vibrate.

[0022] In one possible implementation, the inherent frequency testing method provided in this application is applied to an electronic device, outputting a frequency sweep signal, including:

[0023] Control the output sweep frequency signal of the vibration testing instrument.

[0024] Secondly, this application provides a natural frequency testing system, including: a sound pressure acquisition component, a vibration acceleration acquisition component, and an electronic device, wherein the electronic device is connected to the sound pressure acquisition component and the vibration acceleration acquisition component respectively;

[0025] The sound pressure acquisition component is used to acquire the surface sound pressure signal of the audio device under test under non-contact excitation.

[0026] Vibration acceleration acquisition component, used to acquire vibration acceleration signals of the audio device under test under non-contact excitation;

[0027] An electronic device for performing the first aspect and / or various possible implementations of the first aspect as described above.

[0028] In one possible implementation, it also includes:

[0029] A sound source device is used to generate and output a sound pressure signal under the excitation of a sweep frequency signal. The sound pressure signal is used to excite the vibration of audio equipment.

[0030] And / or, a driving device for outputting a frequency sweep signal under control, the frequency sweep signal for exciting a sound source device to generate and output a sound pressure signal, the sound pressure signal for exciting the vibration of an audio device.

[0031] In one possible implementation, both the vibration acceleration acquisition component and the sound pressure acquisition component are deployed between the sound source device and the audio equipment.

[0032] Thirdly, this application provides a testing apparatus for a natural frequency, comprising:

[0033] The acquisition module is used to acquire the vibration acceleration signal and surface acoustic pressure signal of the audio device under test under non-contact excitation.

[0034] The determination module is used to determine the natural frequency of the audio device based on the surface acoustic pressure signal and the vibration acceleration signal.

[0035] In one possible implementation, the determining module is specifically used for:

[0036] Spectral analysis of the surface acoustic pressure signal is performed to obtain the acoustic pressure spectrum corresponding to the surface acoustic pressure signal;

[0037] Spectral analysis is performed on the vibration acceleration signal to obtain the acceleration spectrum of the vibration acceleration signal;

[0038] Determine the frequency response function of the audio device based on the sound pressure spectrum and acceleration spectrum;

[0039] The inherent frequency of the audio device is obtained based on the frequency response function.

[0040] In one possible implementation, the determining module is specifically used for:

[0041] The frequency response function is determined to be the result of dividing the acceleration spectrum by the sound pressure spectrum.

[0042] In one possible implementation, the acquisition module is specifically used for:

[0043] Perform spectral analysis on the frequency response function to identify frequencies with peak amplitude;

[0044] The frequency with peak amplitude is determined as the inherent frequency of the audio device.

[0045] In one possible implementation, non-contact excitation includes sound pressure excitation.

[0046] In one possible implementation, the device for testing the inherent frequency further includes a processing module, which is specifically used for:

[0047] The control outputs a sweep frequency signal, which is used to excite the sound source device to generate and output a sound pressure signal. The sound pressure signal is used to excite the audio equipment to vibrate.

[0048] In one possible implementation, the inherent frequency testing device provided in this application is applied to an electronic device, and the processing module is further used for:

[0049] Control the output sweep frequency signal of the vibration testing instrument.

[0050] Fourthly, this application provides an electronic device, including: a memory and a processor;

[0051] The memory stores the instructions that the computer executes;

[0052] The processor executes computer execution instructions stored in memory, causing the processor to perform the first aspect and / or various possible implementations of the first aspect as described above.

[0053] Fifthly, this application provides a computer-readable storage medium storing computer-executable instructions, which, when executed, are used to implement the first aspect and / or various possible embodiments of the first aspect.

[0054] In a sixth aspect, this application provides a computer program product, including a computer program that, when executed, implements the first aspect and / or various possible implementations of the first aspect.

[0055] This application provides a method, system, and related apparatus for testing natural frequencies, relating to the field of audio testing. The method includes: acquiring the vibration acceleration signal and surface acoustic pressure signal of the audio device under test under non-contact excitation; and determining the natural frequency of the audio device based on the surface acoustic pressure signal and vibration acceleration signal. Compared to traditional closed-space sound pressure adjustment methods, this application simplifies the operation process by acquiring the vibration acceleration signal and surface acoustic pressure signal of the audio device under test under non-contact excitation. It eliminates the need to analyze the sound pressure at each test frequency point individually; the natural frequency of the audio device under test can be determined directly by analyzing the vibration acceleration signal and surface acoustic pressure signal. Furthermore, the non-contact method reduces the risk of physical contact with the audio device under test, thereby minimizing the possibility of damage. Attached Figure Description

[0056] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0057] Figure 1 Flowchart of the test method for the intrinsic frequency provided in this application Figure 1 ;

[0058] Figure 2 A schematic diagram of the frequency response function provided in the embodiments of this application;

[0059] Figure 3 A schematic diagram of the test method for the inherent frequency provided in the embodiments of this application. Figure 2 ;

[0060] Figure 4 A schematic diagram of the spectrum of the vibration acceleration signal provided in the embodiments of this application;

[0061] Figure 5 A schematic diagram of the spectrum of surface acoustic pressure signals provided in the embodiments of this application;

[0062] Figure 6 A schematic diagram of a test system for inherent frequencies provided in an embodiment of this application;

[0063] Figure 7 This is a schematic diagram showing the positional relationship of different components in the test system provided in the embodiments of this application;

[0064] Figure 8 A schematic diagram of the structure of the test device for the inherent frequency provided in this application;

[0065] Figure 9 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0066] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0067] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0068] Natural frequency testing plays a crucial role in the field of noise, vibration, and harshness (NVH). It helps detect and evaluate the vibration of the equipment under test and helps engineers locate and resolve vibration problems at specific frequencies.

[0069] Currently, common methods for testing natural frequencies include the impact method and the vibrator method. These methods are widely used in industries such as machinery, automobiles, home appliances, shipbuilding, and aircraft manufacturing. The impact method involves directly striking the device under test (DUT) with an impact hammer to induce instantaneous vibration, and then analyzing the vibration to obtain the DUT's natural frequency. The vibrator method uses an electric or electromagnetic vibrator to continuously apply a controllable vibrational force to the DUT. A sweep frequency signal is used to excite the DUT to vibrate, and the vibration is analyzed to obtain the DUT's natural frequency.

[0070] However, the above testing methods all involve applying a large force directly to the device under test, which is typically a large mechanical structure. Applying a large force to a small device could potentially damage it.

[0071] To address the aforementioned problems, this application provides a method for testing natural frequencies. This method obtains the vibration acceleration signal and surface acoustic pressure signal of the audio device under test under non-contact excitation, and directly analyzes the vibration acceleration signal and surface acoustic pressure signal to determine the natural frequency of the audio device under test. Furthermore, the non-contact method reduces the risk of physical contact with the audio device under test, thereby minimizing the possibility of damage to the audio device.

[0072] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0073] Figure 1 Flowchart of the test method for the intrinsic frequency provided in this application Figure 1 ,like Figure 1 As shown, the method includes:

[0074] S101. Acquire the vibration acceleration signal and surface acoustic pressure signal of the audio device under non-contact excitation.

[0075] Vibration acceleration signal represents the acceleration change of the audio device under test when vibrating under non-contact excitation. This vibration acceleration signal is used to analyze the vibration characteristics of the audio device under test. Surface acoustic pressure signal refers to the sound pressure change measured on the surface of the audio device under test, reflecting the pressure fluctuations as sound waves propagate on the surface.

[0076] Furthermore, an audio device refers to a device capable of processing, transmitting, and playing audio signals. This application does not limit the types of audio devices, which include, but are not limited to, the following: mobile phones, speakers, personal computers (PCs), and tablets.

[0077] S102. Determine the natural frequency of the audio device based on the surface acoustic pressure signal and the vibration acceleration signal.

[0078] After acquiring the surface acoustic pressure (SAP) signal and vibration acceleration (CA) signal of the audio device under test via S101, the SAP and CA signals are analyzed to determine the natural frequency of the audio device. The natural frequency refers to the natural frequency of the device when it vibrates freely without external drive. Knowing the natural frequency of an audio device helps in optimizing its design.

[0079] Furthermore, by performing spectral analysis on these two signals, the response characteristics of the audio device at different frequencies can be identified. Even further, by comparing the spectra of the surface acoustic pressure signal and the vibration acceleration signal, the natural frequency can be identified more accurately, and the influence of environmental noise or other interference factors can be eliminated.

[0080] This application's embodiments acquire the vibration acceleration signal and surface acoustic pressure signal of the audio device under test under non-contact excitation. Compared to the traditional closed-space sound pressure adjustment method, this simplifies the operation process, eliminating the need to analyze the sound pressure at each test frequency individually. The natural frequency of the audio device under test can be determined directly by analyzing the vibration acceleration signal and surface acoustic pressure signal. Furthermore, the non-contact method reduces the risk of physical contact with the audio device under test, thereby minimizing the possibility of damage.

[0081] Furthermore, existing testing methods require specialized hardware and software for natural frequency testing, as well as a force hammer (or vibrator), making the testing cost relatively high. To save on testing costs, this application embodiment does not require specialized hardware and software for natural frequency testing when determining the natural frequency of an audio device. That is, this application embodiment does not limit the device used to determine the natural frequency of an audio device; the device can be a vibration testing instrument, a computer, etc.

[0082] The natural frequency of an audio device is determined based on surface acoustic pressure (SAP) signals and vibration acceleration signals, including: performing spectral analysis on the SAP signals to obtain the corresponding SAP spectrum; performing spectral analysis on the vibration acceleration signals to obtain the acceleration spectrum; determining the frequency response function of the audio device based on the SAP spectrum and acceleration spectrum; and obtaining the natural frequency of the audio device based on the frequency response function.

[0083] In this embodiment, it is understood that when determining the inherent frequency of the audio device, it is necessary to first perform spectral analysis on the surface acoustic pressure signal and vibration acceleration signal obtained in S101 to obtain the sound pressure spectrum of the surface acoustic pressure signal and the acceleration spectrum of the vibration acceleration signal. The implementation method for spectral analysis of the surface acoustic pressure signal is similar to that for spectral analysis of the vibration acceleration signal. Therefore, this embodiment uses the implementation method for spectral analysis of the surface acoustic pressure signal as an example to explain how to perform spectral analysis on the surface acoustic pressure signal. Furthermore, the implementation method for spectral analysis of the surface acoustic pressure signal can be set according to actual needs, and this embodiment does not limit it.

[0084] Optionally, spectral analysis is performed on the surface acoustic pressure signal to obtain the corresponding acoustic pressure spectrum, which is typically achieved through the following steps:

[0085] First, the acquired surface acoustic pressure (SAP) signal is preprocessed, including filtering and noise reduction, to eliminate background noise and interference. Next, the preprocessed SAP signal is input into spectrum analysis software to obtain the corresponding SAP spectrum. For example, the preprocessed SAP signal is input into the spectrum analysis software, and a fast Fourier transform is used to convert the time-domain SAP signal into a frequency-domain signal.

[0086] The sound pressure spectrum and acceleration spectrum are analyzed to determine the frequency response function of the audio device. The method for determining the frequency response function of the audio device can be set according to actual needs.

[0087] In one implementation, H1 estimation is used to calculate the frequency response function (FRF) of an audio device. H1 estimation is a technique for calculating the frequency response function by measuring the system's input and output signals to estimate the system's dynamic characteristics. The formula for calculating the FRF using H1 estimation can be expressed as follows:

[0088]

[0089] Where H1(f) is the frequency response function estimated by H1 at frequency f, P yx (f) is the cross spectrum of the input and output signals, P xx (f) is the autospectrum of the input signal.

[0090] In this embodiment, the input signal is a surface acoustic pressure (SAP) signal, which is a deterministic signal; the output signal is a vibration acceleration signal. Therefore, determining the frequency response function of the audio device based on the SAP spectrum and the acceleration spectrum includes determining that the frequency response function is the result of dividing the acceleration spectrum by the SAP spectrum. When the input signal is a deterministic signal, using H1 estimation to calculate the frequency response function of the audio device can more accurately identify the dynamic characteristics of the audio device.

[0091] Furthermore, after determining the frequency response function, it is necessary to determine the inherent frequency of the audio device based on the frequency response function, because the frequency response function describes the response characteristics of the audio device at different frequencies and reflects the relationship between the input signal and the output signal.

[0092] The process of obtaining the natural frequency of an audio device based on its frequency response function includes: performing spectral analysis on the frequency response function to identify frequencies with peak amplitudes; and determining the frequencies with peak amplitudes as the natural frequencies of the audio device. Using the frequency response function to determine the natural frequency of an audio device is a highly efficient analytical method.

[0093] In a frequency response function (RFF) graph, natural frequencies typically appear as significant amplitude peaks, reflecting the natural vibration patterns of an audio device at specific frequencies. Identifying these peak frequencies requires careful analysis of the RFF graph. The peaks of natural frequencies are not only the points of highest amplitude but also accompanied by significant phase changes. These characteristics make natural frequencies very prominent in the RFF graph. Once these peak frequencies are identified, they can be determined as the natural frequencies of the audio device. These frequencies correspond to the resonant frequencies of the audio device, which are the frequencies at which the audio device vibrates naturally without external damping or drive.

[0094] For example, Figure 2 This is a schematic diagram of the frequency response function provided in an embodiment of this application. Figure 2 As can be seen, there is a peak around 800Hz, so the inherent frequency of the audio device can be determined to be 800Hz.

[0095] This application's embodiments can accurately determine the natural frequency of an audio device using a frequency response function method, providing crucial data support for audio device design optimization. Furthermore, the aforementioned natural frequency determination method is not only applicable to audio devices but also widely used in the dynamic characteristic analysis of other mechanical and structural systems.

[0096] Based on the above embodiments, non-contact excitation includes sound pressure excitation. Sound pressure excitation is a method of inducing vibration in audio equipment using sound waves. The sound waves are generated by a sound source device and propagate through the air, creating alternating variations of regional compression and scarcity. When the sound waves reach the surface of the audio equipment, they exert pressure on the equipment, thereby causing the surface to vibrate.

[0097] The embodiments of this application use sound pressure to excite the vibration of audio equipment, which can reduce the risk of damage caused by physical contact with audio equipment.

[0098] Based on the above embodiments, before obtaining the vibration acceleration signal and surface sound pressure signal of the audio device under non-contact excitation, the method further includes: controlling the output of a frequency sweep signal, the frequency sweep signal being used to excite the sound source device to generate and output a sound pressure signal, and the sound pressure signal being used to excite the audio device to vibrate.

[0099] In this embodiment, it is understood that before acquiring the vibration acceleration signal and the surface acoustic pressure signal, it is necessary to control the output sweep frequency signal. The sweep frequency signal is a signal with a gradually changing frequency, its frequency changing from an initial value to an ending value. Further, the sweep frequency signal is used to excite a sound source device to generate and output a sound pressure signal. The sound source device can be selected according to actual needs, including a speaker, piezoelectric transducer, buzzer, etc.

[0100] Taking a speaker as an example, this explains how a sweep signal excites the speaker to generate and output a sound pressure level signal. It should be noted that the device executing the output sweep signal can be selected according to actual needs.

[0101] In one implementation, when a user needs to test the inherent frequency of an audio device, the user inputs a test command for the inherent frequency to a driving device, such as a vibration testing instrument. Upon receiving the test command, the driving device responds by outputting a sweep frequency signal and transmitting it to the speaker's driving unit (e.g., a loudspeaker). The driving unit converts the sweep frequency signal into mechanical vibration using electromagnetic principles, thereby driving the speaker's diaphragm to vibrate. The vibration of the diaphragm generates pressure waves, i.e., sound waves, in the air. The sound waves are output as sound pressure.

[0102] In another implementation, the testing method provided in this application is applied to an electronic device to output a sweep frequency signal, including controlling a vibration testing instrument to output a sweep frequency signal. In this implementation, it can be understood that if a user needs to test the inherent frequency of an audio device, the user will input a test command for the inherent frequency into an electronic device, such as a computer. After receiving the test command, the electronic device will respond to the command, control the vibration testing instrument to create and output a sweep frequency signal, and transmit this sweep frequency signal to the driver unit (e.g., a loudspeaker) of a speaker. The driver unit converts the sweep frequency signal into mechanical vibration through electromagnetic principles, thereby driving the speaker diaphragm to vibrate. The vibration of the diaphragm generates pressure waves, i.e., sound waves, in the air, which are output in the form of sound pressure. In this implementation, by using an electronic device to control the vibration testing instrument to output a sweep frequency signal, the sweep frequency rate and sweep frequency range can be precisely set, providing an accurate data basis for subsequent inherent frequency testing.

[0103] In summary, the embodiments of this application use the output sweep signal to excite a sound source device to generate a sound pressure signal, thereby exciting the audio device to vibrate. This method can comprehensively analyze the frequency response characteristics of the audio device. By covering a wide frequency range, it can identify the inherent frequencies of the audio device and provide accurate performance evaluation.

[0104] Next, taking a mobile phone battery cover as an example, we will explain how to use the inherent frequency testing method provided in the embodiments of this application to test the audio device to be tested. Figure 3 A schematic diagram of the test method for the inherent frequency provided in the embodiments of this application. Figure 2 .like Figure 3 As shown, the test method includes the following steps:

[0105] 1. When the user inputs a test command for the natural frequency into the computer, the computer controls the vibration testing instrument to create a sweep frequency signal and inputs the generated sweep frequency signal into the speaker's drive unit (such as a loudspeaker unit). The drive unit converts the sweep frequency signal into mechanical vibration through electromagnetic principles, which drives the speaker's diaphragm (usually made of paper, plastic, or metal) to vibrate. The vibration of the diaphragm generates pressure waves in the air, i.e., sound waves. The sound waves are output in the form of sound pressure, and the sound pressure generated by the speaker excites the vibration of the mobile phone battery cover.

[0106] 2. An accelerometer is used to test the vibration acceleration signal on the phone's battery cover, and a microphone is used to test the surface sound pressure signal near the battery cover. The vibration acceleration acquisition component is deployed on the audio device under test. Furthermore, both the vibration acceleration acquisition component and the sound pressure acquisition component are deployed between the sound source device and the audio device.

[0107] 3. Use vibration testing instruments to perform spectrum analysis on vibration acceleration signals and surface acoustic pressure signals, and transmit the spectrum analysis results to a computer, which then outputs the received results.

[0108] Alternatively, vibration acceleration signals and surface acoustic pressure signals can be obtained using vibration testing instruments. These signals are then transmitted to a computer, which performs spectral analysis on them. After completing the spectral analysis, the computer outputs the results to the user.

[0109] Furthermore, the spectrum of the vibration acceleration signal can be found in [reference needed]. Figure 4 The spectrum of the surface acoustic pressure signal can be found in [reference needed]. Figure 5 , Figure 4 This is a schematic diagram of the spectrum of the vibration acceleration signal provided in the embodiments of this application. Figure 5 This is a schematic diagram of the spectrum of the surface acoustic pressure signal provided in the embodiments of this application.

[0110] It should be noted that the results of the spectrum analysis include the frequency response function of the phone battery cover and the natural frequency of the phone battery cover.

[0111] In summary, the natural frequency testing device based on sound pressure level measurement provided in this application is suitable for small devices, such as speakers, laptops, tablets, etc. Furthermore, the testing equipment required for the testing method provided in this application is relatively simple: commonly used vibration testing instruments, a microphone, an accelerometer, and a speaker, resulting in low cost.

[0112] Furthermore, embodiments of this application also provide a test system for inherent frequencies. Figure 6 This is a schematic diagram of a test system for the inherent frequency provided in an embodiment of this application.

[0113] like Figure 6 As shown, the testing system includes: a sound pressure acquisition component 601, a vibration acceleration acquisition component 602, and an electronic device 603, wherein the electronic device is connected to the sound pressure acquisition component and the vibration acceleration acquisition component respectively; the sound pressure acquisition component is used to acquire the surface sound pressure signal of the audio device under test under non-contact excitation; the vibration acceleration acquisition component is used to acquire the vibration acceleration signal of the audio device under test under non-contact excitation; the electronic device is used to perform the test method for the natural frequency as described in the above embodiments.

[0114] In this embodiment, the natural frequency testing system includes a sound pressure level (SPL) acquisition component, a vibration acceleration acquisition component, and electronic equipment. The SPL acquisition component is used to acquire the surface sound pressure signal of the audio device under test under non-contact excitation. The type of SPL acquisition component can be selected according to actual needs, and includes, but is not limited to, the following: microphone, sound pressure meter, and data acquisition card. The vibration acceleration acquisition component is used to acquire the vibration acceleration signal of the audio device under test under non-contact excitation. The type of vibration acceleration acquisition component can be selected according to actual needs, and includes, but is not limited to, the following: accelerometer, laser Doppler vibrometer, gyroscope, and displacement sensor.

[0115] This application does not limit the types of sound pressure acquisition components and vibration acceleration acquisition components. Users can choose appropriate devices according to their actual needs, which improves the user experience.

[0116] Based on the above embodiments, the test system further includes: a sound source device for generating and outputting a sound pressure signal under the excitation of a sweep frequency signal, the sound pressure signal being used to excite the audio equipment to vibrate; and / or a driving device for outputting a sweep frequency signal under control, the sweep frequency signal being used to excite the sound source device to generate and output a sound pressure signal, the sound pressure signal being used to excite the audio equipment to vibrate.

[0117] Furthermore, both the vibration acceleration acquisition component and the sound pressure acquisition component are deployed between the sound source device and the audio equipment. The specific location relationship can be found in [reference needed]. Figure 7 , Figure 7 This is a schematic diagram illustrating the positional relationships of different components in the test system provided in an embodiment of this application. For example... Figure 7 As shown, the vibration acceleration acquisition component is deployed on the audio equipment under test. In addition, both the vibration acceleration acquisition component and the sound pressure acquisition component are deployed between the sound source device and the audio equipment. This deployment facilitates comprehensive monitoring and analysis of the entire test system.

[0118] The following are embodiments of the apparatus described in this application, which can be used to execute the embodiments of the method described in this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the method described in this application.

[0119] Figure 8 A schematic diagram of the structure of the test device for the natural frequency provided in this application is shown below. Figure 8 As shown, the natural frequency testing device 800 provided in this embodiment includes:

[0120] The acquisition module 801 is used to acquire the vibration acceleration signal and surface acoustic pressure signal of the audio device under test under non-contact excitation.

[0121] The determination module 802 is used to determine the natural frequency of the audio device based on the surface acoustic pressure signal and the vibration acceleration signal.

[0122] In one possible implementation, the determining module 802 is specifically used for:

[0123] Spectral analysis of the surface acoustic pressure signal is performed to obtain the acoustic pressure spectrum corresponding to the surface acoustic pressure signal;

[0124] Spectral analysis is performed on the vibration acceleration signal to obtain the acceleration spectrum of the vibration acceleration signal;

[0125] Determine the frequency response function of the audio device based on the sound pressure spectrum and acceleration spectrum;

[0126] The inherent frequency of the audio device is obtained based on the frequency response function.

[0127] In one possible implementation, the determining module 802 is specifically used for:

[0128] The frequency response function is determined to be the result of dividing the acceleration spectrum by the sound pressure spectrum.

[0129] In one possible implementation, the acquisition module 801 is specifically used for:

[0130] Perform spectral analysis on the frequency response function to identify frequencies with peak amplitude;

[0131] The frequency with peak amplitude is determined as the inherent frequency of the audio device.

[0132] In one possible implementation, non-contact excitation includes sound pressure excitation.

[0133] In one possible implementation, the device for testing the inherent frequency further includes a processing module (not shown), which is specifically used for:

[0134] The control outputs a sweep frequency signal, which is used to excite the sound source device to generate and output a sound pressure signal. The sound pressure signal is used to excite the audio equipment to vibrate.

[0135] In one possible implementation, the inherent frequency testing device provided in this application is applied to an electronic device, and the processing module is further used for:

[0136] Control the output sweep frequency signal of the vibration testing instrument.

[0137] The device for testing the inherent frequency provided in this embodiment can execute the method provided in the above-described method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0138] It should be noted that the division of the various modules in the above device is merely a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, these modules can be implemented entirely in software via processing element calls; they can be fully implemented in hardware; or some modules can be implemented by processing element calls to software, while others are implemented in hardware. For example, a processing module can be a separate processing element, or it can be integrated into a chip within the device. Alternatively, it can be stored as program code in the device's memory, and its functions can be called and executed by a processing element. The implementation of other modules is similar. Moreover, these modules can be fully or partially integrated together, or they can be implemented independently. The processing element here can be an integrated circuit with signal processing capabilities. During implementation, each step of the above method or each of the above modules can be completed through integrated logic circuits in the hardware of the processor element or through software instructions.

[0139] For example, these modules can be one or more integrated circuits configured to implement the above methods, such as one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs). As another example, when a module is implemented using processing element scheduler code, the processing element can be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. Furthermore, these modules can be integrated together as a System-On-a-Chip (SOC).

[0140] Figure 9 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 9 As shown, the electronic device 900 provided in this application embodiment may include: a processor 901, and a memory 902 communicatively connected to the processor, wherein:

[0141] The memory stores the instructions that the computer executes;

[0142] The processor executes computer execution instructions stored in memory to implement the method described in the foregoing method embodiments.

[0143] It should be understood that processor 901 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the application can be directly manifested as execution by a hardware processor, or execution by a combination of hardware and software modules within the processor. Memory 902 may include high-speed random access memory (RAM), and may also include non-volatile memory (NVM), such as at least one disk storage device, or a USB flash drive, external hard drive, read-only memory, disk, or optical disc, etc.

[0144] Optionally, the electronic device 900 may also include a communication interface 903. In specific implementations, if the communication interface 903, memory 902, and processor 901 are implemented independently, they can be interconnected via a bus to complete communication. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc., but this does not imply that there is only one bus or one type of bus.

[0145] Optionally, in a specific implementation, if the communication interface 903, memory 902, and processor 901 are integrated on a single chip, then the communication interface 903, memory 902, and processor 901 can communicate through an internal interface.

[0146] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed, are used to implement the methods described in any of the foregoing embodiments.

[0147] It is understood that the computer-readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0148] An exemplary computer-readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the computer-readable storage medium. Of course, the computer-readable storage medium can also be a component of the processor. The processor and the computer-readable storage medium can reside in an ASIC. Alternatively, the processor and the computer-readable storage medium can exist as discrete components in an electronic device.

[0149] The integrated modules implemented as software functional modules described above can be stored in a computer-readable storage medium. These software functional modules, stored in a computer-readable storage medium, include several instructions to cause an electronic device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this application.

[0150] This application also provides a computer program product, including a computer program that, when executed, implements the method described in any of the foregoing embodiments.

[0151] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0152] It should be further noted that although the steps in the flowchart are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowchart may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0153] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0154] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0155] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method of testing the natural frequency of a structure, characterized by, include: Acquire the vibration acceleration signal and surface acoustic pressure signal of the audio device under test under non-contact excitation; The natural frequency of the audio device is determined based on the surface acoustic pressure signal and the vibration acceleration signal.

2. The method of claim 1, wherein, Determining the natural frequency of the audio device based on the surface acoustic pressure signal and the vibration acceleration signal includes: Spectral analysis is performed on the surface acoustic pressure signal to obtain the acoustic pressure spectrum corresponding to the surface acoustic pressure signal; The vibration acceleration signal is subjected to spectral analysis to obtain the acceleration spectrum of the vibration acceleration signal; Based on the sound pressure spectrum and the acceleration spectrum, determine the frequency response function of the audio device; The inherent frequency of the audio device is obtained based on the frequency response function.

3. The method of claim 2, wherein, Determining the frequency response function of the audio device based on the sound pressure spectrum and the acceleration spectrum includes: The frequency response function is determined to be the result of dividing the acceleration spectrum by the sound pressure spectrum.

4. The method of claim 2, wherein, Obtaining the inherent frequency of the audio device based on the frequency response function includes: Spectral analysis is performed on the frequency response function to identify frequencies with peak amplitude; The frequency with peak amplitude is determined as the inherent frequency of the audio device.

5. The method according to any one of claims 1 to 4, characterized in that, The non-contact excitation includes sound pressure excitation.

6. The method of claim 5, wherein, Before acquiring the vibration acceleration signal and surface acoustic pressure signal of the audio device under test under non-contact excitation, the method further includes: The control outputs a sweep frequency signal, which is used to excite the sound source device to generate and output a sound pressure signal, and the sound pressure signal is used to excite the audio device to vibrate.

7. The method of claim 6, wherein, The output sweep signal, applied to electronic devices, includes: Control the output sweep frequency signal of the vibration testing instrument.

8. A natural frequency testing system characterized by, include: The system includes a sound pressure acquisition component, a vibration acceleration acquisition component, and an electronic device, wherein the electronic device is connected to both the sound pressure acquisition component and the vibration acceleration acquisition component. The sound pressure acquisition component is used to acquire the surface sound pressure signal of the audio device under test under non-contact excitation. The vibration acceleration acquisition component is used to acquire the vibration acceleration signal of the audio device under test under non-contact excitation. The electronic device is used to perform a test method for the inherent frequency as described in any one of claims 1 to 7.

9. The system of claim 8, wherein, Also includes: A sound source device is used to generate and output a sound pressure signal under the excitation of a frequency sweep signal, the sound pressure signal being used to excite the audio device to vibrate; And / or, a driving device for outputting a frequency sweep signal under control, the frequency sweep signal for exciting a sound source device to generate and output a sound pressure signal, the sound pressure signal for exciting the audio device to vibrate.

10. The system of claim 9, wherein, Both the vibration acceleration acquisition component and the sound pressure acquisition component are deployed between the sound source device and the audio device.

11. A natural frequency testing device, characterized by include: The acquisition module is used to acquire the vibration acceleration signal and surface acoustic pressure signal of the audio device under test under non-contact excitation. The determination module is used to determine the natural frequency of the audio device based on the surface acoustic pressure signal and the vibration acceleration signal.

12. An electronic device, comprising: include: Memory, processor; The memory stores computer-executed instructions; The processor executes computer-executable instructions stored in the memory such that the processor performs the method of any of claims 1 to 7.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium has stored therein computer-executable instructions that, when executed, implement the method of any of claims 1 to 7.

14. A computer program product, characterised in that, A computer program that, when executed, implements the method of any of claims 1 to 7.

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