DPOAE otoacoustic emission testing method, electronic equipment and medium

Abstract

The invention relates to a DPOAE otoacoustic emission testing method, electronic equipment and a medium, and the method comprises the steps: providing sounders, and outputting a dual-frequency stimulation sound signal to each sounder through a USB sound card; double-frequency stimulation sound is sent to the auditory meatus of the subject, the frequency ratio f2: f1 is 1.20-1.25, and each sounder sends out stimulation sound with the specific frequency; receiving an otoacoustic emission signal reflected back from the auditory meatus by using a sound receiver; inputting the signal into a preprocessing circuit for preprocessing; converting the preprocessed signal into a digital signal through an A / D converter, and transmitting the digital signal to a PC; collecting signals for multiple times in the PC and calculating an average value; performing Fourier transform on the averaged time domain signal to obtain a frequency spectrum; extracting frequency components of the stimulation sound and the otoacoustic emission signal from the frequency spectrum, and determining the intensity of the otoacoustic emission signal; the otoacoustic emission signal strength is compared to the noise level to generate a DPOAE audiogram. According to the method, the test accuracy and efficiency are improved, and the operation is simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of otolaryngology detection technology, and in particular to a DPOAE otoacoustic emission testing method, electronic equipment and medium. Background Art

[0002] Otoacoustic emissions (OAEs) are weak audio signals generated in the inner ear cochlea and transmitted through the ossicular chain and eardrum to the external auditory canal. A healthy cochlea not only passively senses external sound waves but also actively generates audio energy, producing OAEs. Therefore, OAE testing is an important method for assessing cochlear function and is widely used in hearing screening, early diagnosis of deafness, and monitoring of hearing loss.

[0003] Otoacoustic emission testing is generally divided into two types: transient otoacoustic emissions (TEOAEs) and distortion otoacoustic emissions (DPOAEs). TEOAEs stimulate the cochlea with brief pulses of sound, which release otoacoustic emission signals after a certain latency period. Distortion otoacoustic emissions (DPOAEs) stimulate the cochlea with two sounds of different frequencies simultaneously, generating distortion signals due to the nonlinear modulation of the cochlear basilar membrane. DPOAEs are often used for more accurate hearing assessment, especially in the high-frequency range.

[0004] like Figure 1 As shown in the figure, existing otoacoustic emission detection systems typically consist of a PC, a USB sound card, a micro-speaker, a micro-microphone, a preprocessing circuit, and a power supply. During distortion otoacoustic emission testing, the system emits two stimuli of different frequencies through the micro-speaker. These stimuli are transmitted through the ear canal to the cochlea. The otoacoustic emission signals generated by the cochlea are received by the micro-microphone and sent to the USB sound card. The input signal from the USB sound card undergoes A / D conversion and is then sent to a computer for data processing and analysis. Although this detection method can effectively obtain otoacoustic emission signals, it still has some technical shortcomings.

[0005] First, existing otoacoustic emission testing equipment typically requires additional power and has strict testing environment requirements, often requiring a soundproof room to prevent ambient noise from interfering with test results. Second, existing testing methods rely on manual observation and interpretation of waveforms, a process that is highly subjective and may affect the accuracy of test results. Summary of the Invention

[0006] (1) Technical issues to be resolved The present invention mainly addresses the problems of existing DPOAE otoacoustic emissions testing equipment relying on a soundproof room, highly subjective test results, and noise interference. A DPOAE otoacoustic emissions testing method, electronic equipment, and medium are proposed to improve test accuracy and efficiency and simplify operation.

[0007] (2) Technical solution To achieve the above objectives, the present invention provides a first aspect of a DPOAE otoacoustic emissions testing method, electronic device, and medium, comprising the following steps: Provide at least two sound generators, and output dual-frequency stimulation sound signals to each sound generator through a USB sound card; Sending a dual-frequency stimulation sound into the ear canal of the subject, wherein the frequency ratio f2:f1 of the first frequency f1 and the second frequency f2 is 1.20-1.25, and each sound generator emits a stimulation sound of a specific frequency; Using a microphone to receive the otoacoustic emission signal reflected from the subject's ear canal; Inputting the otoacoustic emission signal received by the receiver into the preprocessing circuit for preprocessing; The pre-processed signal is converted into a digital signal through an A / D converter and transmitted to a PC; The received signal is collected multiple times in a PC, and the average value of the multiple collected audio time domain signals is calculated; Perform Fourier transform on the averaged audio time domain signal to obtain the signal spectrum; extracting frequency components corresponding to the stimulus sound and the otoacoustic emission signal from the frequency spectrum, and determining the intensity of the otoacoustic emission signal; The intensity of the otoacoustic emission signal is compared with the noise level before and after the expected evoked otoacoustic emission signal in the spectrum to obtain the DPOAE audiogram.

[0008] Furthermore, the preprocessing circuit includes two signal paths, one of which is amplified 2500 times and undergoes filtering and secondary amplification; the other signal is amplified 200 times and undergoes filtering and secondary amplification, and is used as a reference signal to remove stimulation artifacts; the preprocessing circuit also includes a bandpass filter with a filtering band of 400Hz to 10kHz, which is used to remove high-frequency circuit noise.

[0009] Furthermore, during the test, the sound pressure level of the stimulus sound is adjusted through a calibration process to adapt it to the ear canal characteristics of different subjects, ensuring that the sound pressure level is consistent in each test.

[0010] Furthermore, the test is performed ear by ear, wherein the left ear and right ear are tested in sequence, and the program automatically completes the test of both ears.

[0011] Furthermore, the signal processing includes suppressing low-frequency noise using a high-pass filter and reducing the influence of power frequency noise and circuit noise through multiple signal averaging processes.

[0012] Furthermore, the high-pass filter is a first-order filter, and its cut-off frequency is 100 Hz.

[0013] Furthermore, the DPOAE otoacoustic emission test method is implemented by a DPOAE test system, which includes a USB-Hub converter, an otoacoustic probe sensor, a Type-C sound card, user-end operating software, and earplugs. The sound pressure level of the distortion product otoacoustic emission double pure tone stimulus signal is nominally 55dB-65dB, and the stimulus frequency is tested within the following four frequency ranges: f1: 1.64kHz, f2: 2.0kHz f1: 2.46kHz, f2: 3.0kHz f1: 3.28kHz, f2: 4.0kHz f1: 4.10kHz, f2: 5.0kHz, and the frequency ratio f2:f1 is in the range of 1.20-1.25. At least three groups of frequencies are tested to obtain a DPOAE audiogram.

[0014] Furthermore, the synchronous processing of the test data allows binaural data to be collected and processed within the same time window by comparing the timestamps of the left and right ear test signals in real time.

[0015] To achieve the above-mentioned object, the second aspect of the present invention provides an electronic device, comprising a processor and a memory, wherein the processor is configured to implement the steps of the DPOAE otoacoustic emission testing method when executing a computer program stored in the memory.

[0016] To achieve the above-mentioned object, the third aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the DPOAE otoacoustic emission testing method are executed.

[0017] (3) Beneficial effects of the present invention: Compared with the prior art, the DPOAE otoacoustic emission test method, electronic device and medium provided by the present invention effectively solve the problems existing in the prior art of reliance on a soundproof room, large influence of test environment noise and strong subjectivity in result interpretation. First, the use of a short probe design and combined with soundproof earmuffs allows the system to be tested in a conventional environment without the need for a special soundproof room, thereby reducing the complexity and use cost of the test equipment. Secondly, through the dual-probe design, both ears can be tested at the same time, improving efficiency. In addition, the system uses precise data processing algorithms, Fourier transform and signal averaging technology to effectively filter out environmental noise and artifacts, ensuring accurate detection of otoacoustic emission signals, thereby avoiding the subjective errors caused by human observation in traditional methods. Ultimately, the generated DPOAE audiogram is more objective and accurate, significantly improving the reliability of the test and the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a basic principle diagram of an otoacoustic emission detection system disclosed in the prior art.

[0019] Figure 2 This is a basic principle diagram of a DPOAE otoacoustic emission test system disclosed in this application.

[0020] Figure 3 This is a test process interface diagram disclosed in this application. DETAILED DESCRIPTION

[0021] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0024] Otoacoustic emissions (OAEs) are weak audio energy generated in the cochlea of ​​the inner ear and released into the external auditory canal through the ossicular chain and eardrum. They are part of the normal function of the human ear. They demonstrate that the cochlea not only passively senses sound signals but also actively generates audio energy.

[0025] Otoacoustic emissions are primarily categorized as transient otoacoustic emissions (TEOAEs) and distortion otoacoustic emissions (DPOAEs) based on the stimulus they induce. TEOAEs are audio energy released in a specific form after a certain latency period following stimulation of the cochlea by a brief external pulse of sound (generally a short sound within a few milliseconds). Due to this latency, they are also called delayed otoacoustic emissions. Because they can repeat the stimulus content, they resemble an echo and are also called "Kemp echoes." DPOAEs are a series of distorted signals generated by the nonlinear modulation of the basilar membrane when the cochlea is simultaneously stimulated by two initial pure tones with a certain frequency ratio. These signals are transmitted through the ossicular chain and tympanic membrane into the external auditory canal and are recorded as sound.

[0026] like Figure 2 、 Figure 3 As shown, the present invention provides a DPOAE testing system, which is composed of a USB-Hub converter, an otoacoustic probe sensor, a Type-C sound card, user-end operating software, and earplugs. The nominal sound pressure level of the distortion product otoacoustic emission double pure tone stimulus signal is 55dB-65dB. The distortion product otoacoustic emission double pure tone stimulus sound frequency passes three or more of the four groups of frequency nominal value tests: [f1: 1.64kHz, f2: 2.0kHz]; [f1: 2.46kHz, f2: 3.0kHz]; [f1: 3.28kHz, f2: 4.0kHz]; [f1: 4.10kHz, f2: 5.0kHz], and the frequency ratio f2: f1 is within the range of 1.20-1.25. The distortion product otoacoustic emission measurement results are obtained to obtain a DPOAE audiogram.

[0027] This test system can simultaneously test multiple target users using a single controller, while most similar products on the market can only test one user per controller. This significantly improves test efficiency and is particularly suitable for scenarios requiring simultaneous processing of multiple subjects, greatly optimizing clinical or laboratory operational processes.

[0028] Specifically, the present invention further provides a DPOAE otoacoustic emission testing method, which is implemented by the above-mentioned DPOAE testing system and includes the following steps: Step S100: providing at least two sound generators, and outputting dual-frequency stimulation sound signals to each sound generator via a USB sound card; Step S200: emitting a dual-frequency stimulation sound into the ear canal of the subject, wherein the frequency ratio f2:f1 of the first frequency f1 and the second frequency f2 is 1.20-1.25, and each sound generator emits a stimulation sound of a specific frequency; Step S300: using a microphone to receive otoacoustic emission signals reflected from the subject's ear canal; Step S400: inputting the otoacoustic emission signal received by the microphone into a preprocessing circuit for preprocessing; Step S500: convert the pre-processed signal into a digital signal through an A / D converter and transmit it to a PC; Step S600: collecting the received signal multiple times in the PC, and calculating the average value of the multiple collected audio time domain signals; Step S700: Perform Fourier transform on the averaged audio time domain signal to obtain a spectrum of the signal; Step S800: extracting the frequency components corresponding to the stimulus sound and the otoacoustic emission signal from the frequency spectrum, and determining the intensity of the otoacoustic emission signal; Step S900: Compare the intensity of the otoacoustic emission signal with the noise level before and after the expected evoked otoacoustic emission signal in the spectrum to obtain a DPOAE audiogram.

[0029] In this embodiment, as described in step S100 above, at least two sound generators are provided, typically micro-speakers, and dual-frequency stimulation sound signals are output to each sound generator separately via a USB sound card. The USB sound card has at least two independent stimulation sound signal output terminals, capable of transmitting the dual-frequency stimulation signal, after D / A conversion (digital signal to analog signal conversion), to each sound generator. Each sound generator is driven by current to generate a corresponding sound wave signal, with one sound generator outputting a stimulation sound with a frequency of f1 and the other sound generator outputting a stimulation sound with a frequency of f2. In this way, the system can accurately transmit two sound wave signals of different frequencies to the subject's ear canal to stimulate the cochlea to produce distortion otoacoustic emissions (DPOAEs).

[0030] In this embodiment, as described in step S200 above, dual-frequency stimulation sounds are output to two sound generators via a USB sound card. The stimulation signals, generated by the sound generators at frequencies f1 and f2, are then transmitted to the subject's ear canal. To ensure the accuracy of the stimulation signals, the frequencies emitted by the two sound generators satisfy a frequency ratio f2:f1 between 1.20 and 1.25. This frequency ratio is optimized based on the nonlinear modulation characteristics of the cochlea to ensure clear otoacoustic emission signals are induced. In specific implementation, the output signal of the USB sound card is first adjusted to meet the predetermined frequency and sound pressure level requirements. Then, an otoacoustic emission probe is placed in the subject's ear canal, ensuring that the two sound generators are properly positioned to avoid signal distortion or attenuation. In this way, the dual-frequency stimulation signals enter the subject's ear canal, stimulating the cochlea to produce distorted otoacoustic emission signals (DPOAEs).

[0031] In this embodiment, as described in step S300 above, in this step, a microphone (usually a miniature microphone) is used to receive the otoacoustic emission signal reflected from the subject's ear canal. The microphone is placed near the ear canal opening to accurately capture the weak otoacoustic emission signal generated by the cochlea. Since otoacoustic emission signals are usually relatively weak and have a frequency close to that of the stimulus signal, the microphone needs to have high sensitivity and wide-band response to ensure that it can clearly receive the signal from the ear canal. The received otoacoustic emission signal will also include the otoacoustic signal generated by the cochlear reflex, stimulus artifacts, and other environmental noise. The microphone is connected to the preprocessing circuit via a cable to transmit the signal to the subsequent signal processing module.

[0032] In this embodiment, as described in step S400 above, the otoacoustic emission signal received by the receiver is first transmitted to a preprocessing circuit for preprocessing. The preprocessing circuit's primary function is to remove noise and artifacts from the signal, thereby enhancing the quality of the otoacoustic emission signal. The preprocessing circuit typically includes amplification, filtering, and noise suppression modules. The signal first passes through the amplification circuit for gain processing to increase the strength of the weak otoacoustic emission signal, ensuring that subsequent processing can accurately detect the signal. The signal then enters the filtering circuit, where a high-pass, low-pass, or band-pass filter removes unwanted frequency bands, such as low-frequency noise, power frequency interference, and high-frequency circuit noise. The output signal of the preprocessing circuit undergoes further amplification to ensure that the signal reaches a strength level suitable for A / D conversion. After these processing steps, noise and artifacts are effectively suppressed, significantly improving signal quality.

[0033] In this embodiment, as described in step S500 above, the analog otoacoustic emission signal output by the preprocessing circuit is converted into a digital signal via an A / D converter (analog-to-digital converter). The A / D converter is responsible for converting the analog signal into a corresponding digital signal for further processing and analysis in a computer. During the conversion process, the A / D converter samples and quantizes the analog signal, converting it into binary digital data. To ensure signal accuracy, the sampling rate and resolution of the A / D converter should be high enough to accurately capture the details of the otoacoustic emission signal. The converted digital signal is transmitted to a PC via a data interface (such as a USB or serial port), providing data support for subsequent signal processing and analysis steps.

[0034] In this embodiment, as described in step S600 above, the PC performs multiple acquisitions using the received digital signal to improve data reliability. Specifically, the PC first acquires the digital signal from the A / D converter and saves each acquired audio time-domain signal. To reduce the impact of random noise, the data from multiple acquisition cycles is averaged, typically over ten acquisitions. This process helps eliminate transient noise and interference, improves the signal-to-noise ratio, and enhances the otoacoustic emission signal. Each acquired data set is compared with the previous data set, resulting in a more stable and reliable signal.

[0035] In this embodiment, as described in step S700 above, the PC performs a Fourier transform on the audio time-domain signal, which has been collected and averaged multiple times, to obtain the signal's spectrum. The Fourier transform is a mathematical processing method that converts a time-domain signal into a frequency-domain signal, revealing the intensity of each frequency component. In specific implementation, the PC processes the audio signal using a fast Fourier transform (FFT) algorithm, calculating the amplitude and phase information of the signal at different frequencies. The spectrogram displays the frequency components of the stimulus signal and the otoacoustic emission signal, thereby helping to distinguish the otoacoustic emission signal from other noise or artifacts. The Fourier-transformed spectrogram provides basic data for subsequent otoacoustic emission signal extraction and the generation of a DPOAE audiogram.

[0036] In this embodiment, as described in step S800 above, the PC analyzes the spectrogram obtained through Fourier transform to extract frequency components associated with the stimulus and otoacoustic emission signals. Because the frequency of otoacoustic emission signals typically has a specific relationship with the frequency of the stimulus, the PC searches the spectrogram for the corresponding frequency characteristics of the otoacoustic emission signals based on the preset stimulus frequencies f1 and f2, as well as the stimulus frequency ratio range (f2:f1 is 1.20-1.25). Typically, otoacoustic emission signals appear near the stimulus frequency and exhibit specific intensity peaks in the spectrum. The PC demarcates these frequency components and calculates the intensity of the otoacoustic emission signals.

[0037] In this embodiment, as described in step S900 above, in this step, the PC compares the intensity of the extracted otoacoustic emission signal with the corresponding noise level in the spectrogram. The noise level is typically calculated within a frequency band of 100 Hz before and after the frequency of the otoacoustic emission signal and serves as a reference background noise level. Based on the comparison of the otoacoustic emission signal intensity with the noise level, the PC determines whether the otoacoustic emission signal is significantly higher than the noise level. If the otoacoustic emission signal intensity is significantly higher than the noise level, the system deems the otoacoustic emission signal at that frequency valid and generates a DPOAE audiogram. This audiogram displays the otoacoustic emission signal intensity of the subject at different frequencies, reflecting the state of their cochlear function and providing a basis for hearing assessment.

[0038] The preprocessing circuit comprises two signal paths, one for processing the main otoacoustic emission signal and the other for processing the reference signal. One signal path processes the otoacoustic emission signal, initially amplifying it 2500 times through a first-stage amplifier circuit to enhance the weak otoacoustic emission signal. The amplified signal then passes through a bandpass filter with a frequency range of 400 Hz to 10 kHz, removing low-frequency noise below 400 Hz and high-frequency circuit noise above 10 kHz. The filtered signal is further amplified by a second-stage amplifier circuit to ensure that the signal strength meets the required standards for subsequent digital conversion and analysis. The other signal path processes the reference signal, initially amplifying it 200 times through a first-stage amplifier circuit, then filtering it through the same bandpass filter. Finally, after amplification by the second-stage amplifier circuit, it is transmitted as the reference signal to subsequent circuits to remove interference from stimulus artifacts and ambient noise. This split-path processing method allows the preprocessing circuit to effectively extract valid otoacoustic emission signals and remove artifacts from the reference signal, ensuring the accuracy of the final signal.

[0039] Before the test begins, the system will undergo a calibration process to ensure that the sound pressure level of the stimulus is consistent in the ear canals of different subjects. Specifically, the sound in the subject's ear canal is monitored and adjusted in real time through the speaker and microphone in the DPOAE probe. First, the system outputs a dual-frequency stimulus signal at a predetermined standard sound pressure level (for example, 65dB) and uses the microphone in the probe to measure the sound pressure level received in the ear canal in real time. If the measured sound pressure level does not match the predetermined value, the system will automatically adjust the output intensity of the speaker until the actual sound pressure level in the ear canal reaches the required standard value. This calibration process ensures that the sound pressure level of the stimulus remains consistent regardless of the shape, size or other individual differences of the subject's ear canal, thereby ensuring the comparability and accuracy of each test result.

[0040] During the test, the system performs DPOAE tests on the subject's left and right ears one by one in sequence. First, after the subject puts on the headphones and otoacoustic emission probe, the system automatically identifies the left ear as the first test target and starts stimulating and collecting data for the left ear. After the test is completed, the system automatically switches to the right ear and performs stimulation sound output and data collection for the right ear in turn. The entire test process is controlled by the program and does not require operator intervention, ensuring that the test sequence is accurate and efficient. Between the tests of the left and right ears, the system automatically adjusts the settings to ensure that the sound pressure level and frequency settings are consistent for each test. Through this automated process, subjects can quickly complete the test of both ears, reducing operational complexity and improving test efficiency.

[0041] During signal processing, the signal is first processed using a high-pass filter to suppress low-frequency noise. The cutoff frequency of the high-pass filter is typically set to 100 Hz or higher, effectively filtering out power-frequency noise and other low-frequency interference below this frequency. Next, to further reduce the impact of power-frequency noise and circuit noise, the system performs multiple averaging on the collected signal. Specifically, the system collects the signal at least 10 times, averaging the signal after each acquisition to smooth out random noise and reduce the impact of periodic noise. This process increases signal stability and improves the signal-to-noise ratio of the effective signal, thereby ensuring the accurate extraction and subsequent analysis of the otoacoustic emission signal.

[0042] In the DPOAE otoacoustic emission test, the synchronous processing of test data ensures the synchronous acquisition and processing of binaural data by comparing the timestamps of the left and right ear test signals in real time. At the beginning of the test, each test signal of the left and right ears is assigned a separate timestamp to mark the specific time of each acquisition. Then, based on these timestamps, the test data of the left and right ears are monitored in real time, and it is ensured that the signals of the left and right ears are acquired within the same time window. In this way, the signals of the two ears can be accurately compared, and the acquisition time corresponding to each signal can be guaranteed to be completely consistent, thereby ensuring the synchronization and accuracy of the binaural data. After data synchronization, the test results of both ears are simultaneously input into the subsequent data processing link for unified signal analysis and generation of DPOAE audiograms.

[0043] According to another aspect of an embodiment of the present application, an electronic device is provided, including a processor and a memory, wherein the processor is configured to implement the steps of the method when executing a computer program stored in the memory.

[0044] In the above embodiments of the present invention, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0045] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0046] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0047] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc. Various media that can store program codes.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A DPOAE otoacoustic emission testing method, characterized in that: The following steps are involved: Provide at least two sound generators, and output dual-frequency stimulation sound signals to each sound generator through a USB sound card; Sending a dual-frequency stimulation sound into the ear canal of the subject, wherein the frequency ratio f2:f1 of the first frequency f1 and the second frequency f2 is 1.20-1.25, and each sound generator emits a stimulation sound of a specific frequency; Using a microphone to receive the otoacoustic emission signal reflected from the subject's ear canal; Inputting the otoacoustic emission signal received by the receiver into the preprocessing circuit for preprocessing; The pre-processed signal is converted into a digital signal through an A / D converter and transmitted to a PC; The received signal is collected multiple times in a PC, and the average value of the multiple collected audio time domain signals is calculated; Perform Fourier transform on the averaged audio time domain signal to obtain the signal spectrum; extracting frequency components corresponding to the stimulus sound and the otoacoustic emission signal from the frequency spectrum, and determining the intensity of the otoacoustic emission signal; The intensity of the otoacoustic emission signal is compared with the noise level before and after the expected evoked otoacoustic emission signal in the spectrum to obtain the DPOAE audiogram.

2. A DPOAE otoacoustic emission testing method according to claim 1, characterized in that: The preprocessing circuit includes two signal paths, one of which is amplified 2500 times and then filtered and amplified twice; the other is amplified 200 times and then filtered and amplified twice, and is used as a reference signal to remove stimulation artifacts. The preprocessing circuit also includes a bandpass filter with a filtering band of 400Hz to 10kHz for removing high-frequency circuit noise.

3. A DPOAE otoacoustic emission testing method according to claim 1, characterized in that: During the test, the sound pressure level of the stimulus sound is adjusted through a calibration process to adapt it to the ear canal characteristics of different subjects to ensure consistent sound pressure level in each test.

4. A DPOAE otoacoustic emission testing method according to claim 3, characterized in that: The test is performed ear by ear, with the left and right ears tested in sequence, and the program automatically completes the test for both ears.

5. A DPOAE otoacoustic emission testing method according to claim 1, characterized in that: Signal processing includes using a high-pass filter to suppress low-frequency noise and reducing the impact of power frequency noise and circuit noise through multiple signal averaging processes.

6. A DPOAE otoacoustic emission testing method according to claim 5, characterized in that: The high-pass filter is a first-order filter, and its cut-off frequency is 100 Hz.

7. A DPOAE otoacoustic emission testing method according to claim 2, characterized in that: The DPOAE otoacoustic emissions test method is implemented using a DPOAE test system, which includes a USB-Hub converter, an otoacoustic probe sensor, a Type-C sound card, user-end operating software, and earplugs. The sound pressure level of the distortion product otoacoustic emissions double pure tone stimulus signal is nominally 55dB-65dB, and the stimulus frequency is tested within the following four frequency ranges: f1: 1.64kHz, f2: 2.0kHz f1: 2.46kHz, f2: 3.0kHz f1: 3.28kHz, f2: 4.0kHz f1: 4.10kHz, f2: 5.0kHz, and the frequency ratio f2:f1 is in the range of 1.20-1.

25. At least three groups of frequencies are tested to obtain a DPOAE audiogram.

8. A DPOAE otoacoustic emission testing method according to claim 1, characterized in that: The synchronous processing of test data is achieved by comparing the timestamps of the left and right ear test signals in real time, so that the binaural data can be collected and processed within the same time window.

9. An electronic device, characterized in that: The device comprises a processor and a memory, wherein the processor is configured to implement the steps of a DPOAE otoacoustic emission testing method as claimed in any one of claims 1 to 8 when executing a computer program stored in the memory.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the DPOAE otoacoustic emission testing method according to any one of claims 1 to 8 are executed.

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