How to optimize the operating conditions of bone conduction earphones

Abstract

The present application discloses a method for optimizing the operating state of a bone conduction earphone, wherein the bone conduction earphone includes an earphone core and at least one vibration sensor, and the method includes the steps of: acquiring, by the at least one vibration sensor, a vibration signal derived at least in part from vibrations generated by the earphone core in response to an audio signal, wherein the vibration of the earphone core is configured to be transmitted to a user wearing the bone conduction earphone by way of bone conduction; determining a vibration response characteristic of the earphone core based on the vibration signal and the audio signal; and feeding back an operating state of the bone conduction earphone based on the vibration response characteristic of the earphone core.

Description

[Technical field]

[0001] The present application relates to the field of acoustics, and in particular to a method for optimizing the operating conditions of a bone conduction earphone.

[0002] [Incorporated by reference] This application claims priority to China Application No. 202110033059.0, filed on January 11, 2021, the entire contents of which are incorporated herein by reference. [Background technology]

[0003] Unlike conventional air conduction earphones, when worn by a user, the earphone core of the bone conduction earphone fits the skin of the user's head, and transmits vibrations directly to the ossicles of the user's middle ear or the cochlea of ​​the inner ear through the user's bone, allowing the user to hear sound. However, in this process, different operating states of the bone conduction earphone may adversely affect its functionality. For example, if the bone conduction earphone is not worn by a user in a good operating state, that is, if the fit between the earphone core of the bone conduction earphone and the skin of the user's head is poor, the user cannot hear sound through the bone conduction earphone or the quality of the sound heard is poor, thereby degrading the user's hearing experience and wearing experience. It is important to determine what operating state the bone conduction earphone is in and to perform corresponding feedback and optimization to ensure the functionality of the bone conduction earphone. Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, it is necessary to provide a method for determining, feeding back and optimizing the operating state of a bone conduction earphone to ensure the functionality of the bone conduction earphone so that a user has an excellent hearing experience and wearing experience when wearing the bone conduction earphone. [Means for solving the problem]

[0005] In a method for optimizing the operating state of a bone conduction earphone according to one embodiment of the present application, the bone conduction earphone includes an earphone core and at least one vibration sensor, and the method includes the steps of: acquiring, by the at least one vibration sensor, a vibration signal derived at least in part from a vibration generated by the earphone core in response to an audio signal, wherein the vibration of the earphone core is configured to be transmitted to a user wearing the bone conduction earphone in a bone conduction manner; determining a vibration response characteristic of the earphone core based on the vibration signal and the audio signal; and feeding back an operating state of the bone conduction earphone based on the vibration response characteristic of the earphone core.

[0006] A bone conduction earphone according to one embodiment of the present application includes an acquisition module, a determination module, and a control module, wherein the acquisition module is configured to acquire a vibration signal derived at least in part from a vibration generated by an earphone core in response to an audio signal using at least one vibration sensor, and the vibration of the earphone core is transmitted to a user wearing the bone conduction earphone in a bone conduction manner, the determination module determines a vibration response characteristic of the earphone core based on the vibration signal and the audio signal, and the control module feeds back an operating state of the bone conduction earphone based on the vibration response characteristic of the earphone core.

[0007] A method for training a discrimination model according to one embodiment of the present application includes the steps of acquiring sample information, determining a sample type, including a positive sample type or a negative sample type, for each of at least two users' wearing records based on the sample information, determining sample characteristic information corresponding to each of the at least two users' wearing records based on the sample information, and determining the discrimination model based on the sample characteristic information and the sample type of each of the at least two users' wearing records.

[0008] The present application will be further illustrated by exemplary embodiments, which are not limiting and are illustrated in the drawings, in which like reference numerals indicate like structures. [Brief description of the drawings]

[0009] [Figure 1] 1 is a flowchart of a method for optimizing the working state of a bone conduction earphone according to some embodiments of the present application. [Diagram 2] 1 is a flowchart of a method for providing feedback on the operating status of a bone conduction earphone according to some embodiments of the present application. [Diagram 3] 11A and 11B are frequency response curves of the vibration of the earphone core when the bone conduction earphone is in an operating state where it is worn by a user and when it is not worn by a user, according to some embodiments of the present application. [Figure 4] 1 is a flowchart of a method for providing feedback on the operating status of a bone conduction earphone according to some embodiments of the present application. [Diagram 5] 11A and 11B are frequency response curves of the vibration of the earphone core when the operating state of the bone conduction earphone is in a good user wearing state and a bad user wearing state according to some embodiments of the present application. [Figure 6] 1 is a flowchart of a method for providing feedback on the operating status of a bone conduction earphone according to some embodiments of the present application. [Figure 7] 1 shows frequency response curves of earphone core vibrations corresponding to a case where the clamping force is large when the user is wearing the bone conduction earphone in some embodiments of the present application, and frequency response curves of earphone core vibrations corresponding to a case where the clamping force is small when the user is wearing the bone conduction earphone. [Figure 8] 11A-11C are frequency response curves of earphone core vibration when different users wear the same bone conduction earphone, according to some embodiments of the present application. [Figure 9]10 is a frequency response curve of the vibration of the earphone core when the same user wears the bone conduction earphone multiple times, according to some embodiments of the present application. [Figure 10] 1 is a flowchart of a method for providing feedback on the operating status of a bone conduction earphone according to some embodiments of the present application. [Figure 11] 1 is a flowchart of a method for providing feedback on the operating status of a bone conduction earphone according to some embodiments of the present application. [Figure 12] 1 is a flowchart of a method for providing feedback on the operating status of a bone conduction earphone according to some embodiments of the present application. [Figure 13] 1 is a flowchart of a method for training a discriminative model, according to some embodiments of the present application. [Figure 14] FIG. 2 is a module diagram of a bone conduction earphone according to some embodiments of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In order to more clearly describe the technical means of the embodiments of the present application, the drawings necessary for the description of the embodiments will be briefly described below. Obviously, the drawings described below are merely some examples or embodiments of the present application, and those skilled in the art can apply the present application to other similar scenarios based on these drawings without creative efforts. Unless otherwise clear from the language environment or described otherwise, the same numbers in the drawings indicate the same structures or operations.

[0011] It should be understood that the terms "system," "apparatus," "unit," and / or "module" used herein are ways of distinguishing between various assemblies, elements, parts, portions, or assemblies at different stages, however, other terms may be used in place of the above terms if the other terms can achieve the same purpose.

[0012] As used herein and in the claims, unless otherwise clearly indicated through context, terms such as "a," "one," "one kind," and / or "the" do not specifically refer to the singular but may include the plural. In general, the terms "comprise" and "containing" are merely intended to indicate the inclusion of explicitly identified steps and elements, and these steps and elements are not intended to be an exclusive listing, and a method or apparatus may include other steps or elements.

[0013] In this application, flowcharts are used to describe the operations performed by the system according to the embodiments of this application. It should be understood that the preceding or subsequent operations are not necessarily performed in exact order. Instead, the steps may be processed in reverse order or simultaneously. Also, other operations may be added to these processes, or one or more operations may be removed from these processes.

[0014] When using bone conduction earphones, different operating states of the bone conduction earphones may affect the functionality of the bone conduction earphones, so that the user will have a bad hearing experience and wearing experience. For example, when a user wears a bone conduction earphone, if the bone conduction earphones are not worn well, the quality of the sound heard by the user through the bone conduction earphones will be poor. For example, when a user wears a bone conduction earphone, if the initial input voltage of the bone conduction earphones is small or large, it will cause the volume of the sound heard by the user to be too small or too large, giving the user a bad hearing experience or damaging the user's hearing. For example, when a user wears a bone conduction earphone, the clamping force is too small or too large, which will affect the transmission efficiency of bone conduction and the hearing experience or wearing experience of the user. For example, the bone conduction earphones will automatically enter or not exit the working state according to whether they are worn or not worn by the user, thereby increasing the power consumption of the bone conduction earphones and affecting the wearing experience of the user.

[0015] In response to the above problem, this specification describes a method for optimizing the working state of a bone conduction earphone, which optimizes the working state of the bone conduction earphone by feeding back the working state of the bone conduction earphone, thereby ensuring that the user has a good hearing experience and wearing experience. In some embodiments, the bone conduction earphone may include an earphone core and at least one vibration sensor, and the earphone core may generate vibration in response to an audio signal, and the vibration may be transmitted to a user wearing the bone conduction earphone in a bone conduction manner, and since the load of the skin at different positions of the human body is different, the vibration of the earphone core is related to the actual wearing position of the user, and the vibration signal after the earphone core is coupled with the skin of the human body can be obtained by at least one vibration sensor. Furthermore, the vibration response characteristic of the earphone core can be determined based on the audio signal and the vibration signal, and the working state of the bone conduction earphone can be fed back based on the vibration response characteristic of the earphone core to realize the optimization of the working state of the bone conduction earphone. In some embodiments, feeding back the operating state of the bone conduction earphone may include generating an instruction to pause playback of the bone conduction earphone or adaptively adjusting the power consumption of the bone conduction earphone to reduce the power consumption of the bone conduction earphone when the user is not wearing the bone conduction earphone. In some embodiments, feeding back the operating state of the bone conduction earphone may include generating a prompt to prompt the user to re-wear the bone conduction earphone when the bone conduction earphone is not properly worn, so that the quality of the sound heard by the user through the bone conduction earphone is high and a good hearing experience is obtained. In some embodiments, feeding back the operating state of the bone conduction earphone may include adaptively adjusting the amplitude of the audio signal input to the earphone core when the input voltage of the earphone core of the bone conduction earphone is too small or too large, to ensure that the user can hear the sound at an appropriate volume.In some embodiments, feeding back the operating state of the bone conduction earphone may include adaptively adjusting the clamping force when the user wears the bone conduction earphone when the clamping force is too small or too large, to ensure the transmission efficiency of bone conduction and ensure the comfort of the user when wearing it. In some embodiments, feeding back the operating state of the bone conduction earphone may further include performing EQ compensation on the audio signal input to the earphone core when different users wear the bone conduction earphone or the same user wears the bone conduction earphone repeatedly, to ensure that the sound effect that different users or users with different wearing methods can hear through the bone conduction earphone is the same. In some embodiments, feeding back the operating state of the bone conduction earphone may further realize monitoring the physiological state of the user to monitor and feed back the health status of the user.

[0016] FIG. 1 is a flowchart of a method for optimizing the working state of a bone conduction earphone according to some embodiments of the present application.

[0017] In some embodiments, the bone conduction earphone may include an earphone core and at least one vibration sensor. In the bone conduction earphone, the earphone core may be an energy conversion device, and may convert a received audio signal into mechanical vibration, which is transmitted to a person's ear in the manner of bone conduction, so that the person can hear the corresponding sound. In some embodiments, the earphone core may include, but is not limited to, an electric (coil type), a moving iron type, a piezoelectric type, a pneumatic type, and an electrode type earphone core, and may generate vibration in response to an audio signal. For example, the earphone core may be an electric earphone core, and may have a structure including an electromagnet, a coil, and a diaphragm, and the coil is connected to the diaphragm and may drive the diaphragm so that the diaphragm vibrates when driven by a signal current.

[0018] The vibration sensor may be a sensor that collects a frequency response curve of the earphone core vibration based on the vibration of the earphone core. In some embodiments, at least one vibration sensor may be installed inside or on the surface of the earphone core, and the vibration sensor may obtain a vibration signal based on the vibration of the earphone core, and then obtain a frequency response curve of the earphone core vibration based on the audio signal and the vibration signal, and determine a vibration response characteristic of the earphone core vibration from the frequency response curve. In some embodiments, the vibration response characteristic of the earphone core may include one or more of a resonant frequency of the earphone core, a response peak of a specific frequency, a quality factor, and an input voltage. In some embodiments, when classified based on the parameters that the vibration sensor measures, the vibration sensor may include a displacement sensor, a velocity sensor, an acceleration sensor, and the like, or a combination thereof. Different types of sensors can be applied to collect vibration of different frequency bands of the earphone core. For example, if the vibration sensor is a displacement sensor, it can collect low-frequency vibration of the earphone core. Also, for example, if the vibration sensor is a velocity sensor, it can collect mid-frequency vibration of the earphone core. Also, for example, if the vibration sensor is an acceleration sensor, it can collect mid-high frequency vibration of the earphone core. In some embodiments, the bone conduction earphone may further include at least one vibration sensor that acquires vibration signals of each frequency band (e.g., low frequency, medium frequency, high frequency, etc.) so as to monitor vibration signals of the entire frequency band. In some embodiments, the vibration sensor may include an active sensor (requiring external voltage or current excitation) or a passive sensor when classified based on the presence or absence of external excitation. In some embodiments, the vibration sensor may include, but is not limited to, a single-axis sensor, a multi-axis sensor, and a rotational angular velocity sensor when classified based on the vibration direction to be measured. Different types of sensors have different vibration directions to be measured, for example, a single-axis sensor can realize the measurement of a single-axis vibration direction. A multi-axis sensor and a rotational angular velocity sensor can realize the measurement of a multi-axis vibration direction.In some embodiments, types of vibration sensors include, but are not limited to, piezoelectric sensors, Integrated Circuits Piezoelectric (ICP) acceleration sensors, Microelectro Mechanical Systems (MEMS) sensors, and the like.

[0019] As shown in FIG. 1, a method 100 for optimizing the operating state of a bone conduction earphone may include the following steps 110 to 130.

[0020] In step 110, a vibration signal is obtained by at least one vibration sensor.

[0021] In some embodiments, step 110 may be performed by an acquisition module (e.g., acquisition module 1410) of the bone conduction earphone. In some embodiments, the vibration signal is at least partially derived from a vibration generated by the earphone core in response to the audio signal. Specifically, the earphone core can convert the received audio signal into a mechanical vibration, which is transmitted to a user wearing the bone conduction earphone in a bone conduction manner so that the user can hear the corresponding sound, and the mechanical vibration can be transmitted to a vibration sensor located inside or on the surface of the earphone core, which obtains a corresponding vibration signal based on the mechanical vibration, and obtains a frequency response curve of the earphone core vibration based on the audio signal and the vibration signal, and determines the vibration response characteristic of the earphone core from the frequency response curve. In some embodiments, the audio signal may include an optical signal, an electrical signal, a magnetic signal, a mechanical signal, etc., having audio information. In some embodiments, the earphone core may receive the audio signal in a manner of a wired or wireless connection, and the audio signal may be derived from a storage unit of the bone conduction earphone itself, or may be derived from a terminal device other than the bone conduction earphone (e.g., a mobile phone, a computer, an MP3, etc.). In some embodiments, the audio signal may be a pre-defined audio calibration signal. For example, the audio calibration signal may be a frequency sweep signal, a white noise signal, or a sound signal corresponding to music. In some embodiments, the audio signal may be a sound signal being played when a user is wearing the bone conduction earphones.

[0022] In step 120, a vibration response characteristic of the earphone core is determined based on the vibration signal and the audio signal.

[0023] In some embodiments, step 120 may be performed by a determination module (e.g., determination module 1420) of the bone conduction earphone. In some embodiments, the vibration sensor may obtain a vibration signal based on the vibration (also referred to as mechanical vibration) of the earphone core, and then obtain a frequency response curve of the earphone core vibration based on the vibration signal and the audio signal, and determine the vibration response characteristic of the earphone core based on the frequency response curve of the earphone core. In some embodiments, the vibration response characteristic of the earphone core may be extracted from the frequency response curve of the earphone core vibration by a characteristic extraction method. In some embodiments, the method of extracting the vibration response characteristic may include, but is not limited to, Principal Components Analysis (PCA), Independent Component Analysis (ICA), Linear Discriminant Analysis (LDA), Singular Value Decomposition (SVD), and the like. In some embodiments, the vibration response characteristic of the earphone core may include at least one of the resonant frequency of the earphone core, a response peak of a specific frequency, a quality factor, and an input voltage. Furthermore, from the frequency response curve of the earphone core vibration, the resonant frequency of the earphone core, a response peak at a particular frequency, a quality factor, or a parameter value characterizing the input voltage of the earphone core (e.g., vibration amplitude, velocity, acceleration, etc.), or any combination thereof, can be determined.

[0024] In step 130, feedback is provided on the operating state of the bone conduction earphone based on the vibration response characteristics of the earphone core.

[0025] In some embodiments, step 130 may be performed by a control module (e.g., control module 1430) of the bone conduction earphone. In some embodiments, different operating states of the bone conduction earphone affect the vibration of the earphone core, so that the earphone core has different vibration response characteristics. Therefore, by determining what operating state the bone conduction earphone is in according to the vibration response characteristics of the earphone core, the operating state of the bone conduction earphone can be fed back to optimize the operating state of the bone conduction earphone, so that the hearing experience and wearing experience can be guaranteed when the user wears the bone conduction earphone. In some embodiments, feeding back the operating state of the bone conduction earphone based on the vibration response characteristics of the earphone core can be realized by an algorithm. It should be noted that in some embodiments, determining different operating states of the bone conduction earphone may be performed based on a certain time interval (e.g., 1s, 2s, 3s, etc.). In some embodiments, determining the operating state of the bone conduction earphone may be performed in a certain time range (e.g., 3s, 4s, 5s, etc.) when the bone conduction earphone is powered on.

[0026] In some embodiments, the operation state of the bone conduction earphone may include a user-worn state and a user-not-worn state. Based on the vibration response characteristics of the earphone core, feeding back the operation state of the bone conduction earphone may include determining whether the operation state of the bone conduction earphone is a user-not-worn state based on the vibration response characteristics of the earphone core, and when the operation state of the bone conduction earphone is a user-not-worn state, generating an instruction to pause the operation (e.g., playback) of the bone conduction earphone or adjust the power consumption of the bone conduction earphone to reduce the power consumption of the bone conduction earphone. When the operation state of the bone conduction earphone is a user-worn state, the bone conduction earphone continues to hold the operation state or further determines another operation state of the bone conduction earphone (e.g., a user-worn state / a user-not-worn state, the clamping force is too large or too small, etc.). For more description of the operation state of the bone conduction earphone including a user-worn state and a user-not-worn state, and feeding back the operation state of the bone conduction earphone, please refer to FIG. 2 and its related description.

[0027] In some embodiments, the operation state of the bone conduction earphone may include a user good wearing state and a user bad wearing state. Based on the vibration response characteristics of the earphone core, feeding back the operation state of the bone conduction earphone may include determining whether the operation state of the bone conduction earphone is a user bad wearing state based on the vibration response characteristics of the earphone core, and when the operation state of the bone conduction earphone is a user bad wearing state, the bone conduction earphone generates presentation information to prompt the user to re-wear the bone conduction earphone or adjust the wearing posture and position of the bone conduction earphone, thereby ensuring the user's hearing experience and wearing experience. When the operation state of the bone conduction earphone is a user good wearing state, the bone conduction earphone continues to maintain the operation state of the good wearing state. For more explanation of the operation state of the bone conduction earphone including a user good wearing state and a user bad wearing state, and feeding back the operation state of the bone conduction earphone, please refer to FIG. 4 and its related description.

[0028] In some embodiments, the operating state of the bone conduction earphone may be related to the clamping force when the user wears the bone conduction earphone. Based on the vibration response characteristics of the earphone core, feedback of the operating state of the bone conduction earphone may include: based on the vibration response characteristics of the earphone core, determining whether the clamping force when the user wears the bone conduction earphone is within a predetermined range; and if the clamping force is not within the predetermined range, generating an instruction to adjust the corresponding structure of the bone conduction earphone to change the clamping force when the user wears the bone conduction earphone. By making the clamping force within the predetermined range, the user can avoid the clamping force being too small, which causes poor sound quality of the sound heard through the bone conduction earphone by the user, or the clamping force being too large, which causes the user to wear it uncomfortable, thereby ensuring the user's hearing experience and wearing experience. For more explanation of the operating state of the bone conduction earphone related to the clamping force when the user wears the bone conduction earphone and feedback of the operating state of the bone conduction earphone, please refer to FIG. 6 and its related description.

[0029] In some embodiments, the working state of the bone conduction earphone may include the input voltage of the earphone core. Based on the vibration response characteristics of the earphone core, feeding back the working state of the bone conduction earphone may include obtaining a parameter value that characterizes the input voltage of the earphone core, determining whether the parameter value is at a voltage threshold, and adjusting the amplitude of the audio signal input to the earphone core if the input voltage of the earphone core is not at the voltage threshold. The amplitude of the audio signal of the earphone core is not too small so that the sound quality or volume of the sound that the user can hear through the bone conduction earphone is poor, and the amplitude of the audio signal is not too large so that the earphone core is damaged or the user feels uncomfortable, and thus impairs the user's hearing, thereby ensuring the user's hearing experience and wearing experience. For more explanation of the working state of the bone conduction earphone including the input voltage and feeding back the working state of the bone conduction earphone, please refer to FIG. 11 and its related description.

[0030] In some embodiments, feeding back the operating state of the bone conduction earphone based on the vibration response characteristic of the earphone core may include identifying a difference between the vibration response characteristic of the earphone core and a target vibration response characteristic, and making an EQ adjustment to the audio signal input to the earphone core based on the difference. For further explanation, please refer to FIG. 10 and its related description.

[0031] In some embodiments, feeding back the operating state of the bone conduction earphone based on the vibration response characteristics of the earphone core may include obtaining a parameter value related to a physiological parameter of the user based on the vibration response characteristics of the earphone core, and turning on or off an auxiliary module of the bone conduction earphone based on the parameter value. For further explanation, please refer to FIG. 12 and its related description.

[0032] In some embodiments, the operating state of the bone conduction earphone may include a user-worn state and a user-unworn state. The user-worn state is the operating state of the bone conduction earphone when it is worn by a user, and in this case, it can also be understood that the earphone core of the bone conduction earphone fits to the skin of the user's head. The user-unworn state is the state of the bone conduction earphone when it is not worn by a user, and in this case, it can be understood that the bone conduction earphone does not fit to the skin of the user's head.

[0033] 2 is a flowchart of a method for feeding back an operation state of a bone conduction earphone according to some embodiments of the present application. When it is determined that the operation state of the bone conduction earphone is a user-worn state or a user-unworn state, the method 200 for feeding back an operation state of the bone conduction earphone based on the vibration response characteristics of the earphone core may include the following steps 210 to 220.

[0034] In step 210, it is determined whether the operating state is not worn by a user based on the vibration response characteristics of the earphone core.

[0035] In some embodiments, step 210 may be performed by a determination module (e.g., determination module 1420) of the bone conduction earphone. In some embodiments, when the operating state of the bone conduction earphone is a user-worn state, the earphone core contacts the user's skin, and the mechanical impedance of the skin affects the vibration of the earphone core, and when the operating state of the bone conduction earphone is a user-unworn state, the earphone core does not contact the user's skin, and the vibration of the earphone core is not affected by the mechanical impedance of the skin. Therefore, since the vibration signal of the earphone core collected by the vibration sensor when the operating state of the bone conduction earphone is a user-worn state and a user-unworn state is different, when the operating state of the bone conduction earphone is a user-worn state and a user-unworn state, the earphone core has different vibration response characteristics (e.g., resonant frequency, response peak of a specific frequency, quality factor, etc.), and it can be determined whether the operating state of the bone conduction earphone is a user-worn state or a user-unworn state based on the vibration response characteristics of the earphone core. To further explain the bone conduction earphone in a user-worn state and a user-unworn state, the following description will be made with reference to FIG. 3. FIG. 3 shows frequency response curves of the earphone core vibration when the operating state of the bone conduction earphone is in a user-worn state and when the earphone core vibration is not worn by the user according to some embodiments of the present application. The solid line in FIG. 3 is the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is in a user-worn state, and the dashed line in FIG. 3 is the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is in a user-worn state. As shown in FIG. 3, there is an obvious difference between the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is in a user-worn state and the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is in a user-worn state, and the vibration response characteristics of the earphone core when the operating state of the bone conduction earphone is in a user-worn state and the vibration response characteristics of the earphone core when the operating state of the bone conduction earphone is in a user-worn state are also different. For example, the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is in a user-worn state is flatter than the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is in a user-unworn state.For example, the frequency corresponding to the response peak in the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is a user-worn state is lower than the frequency corresponding to the response peak in the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is a user-unworn state. Specifically, the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is a user-unworn state has a response peak 310 corresponding to a frequency of about 26 Hz, and has a response peak 320 at a frequency of about 100 Hz. The response peak 310 is about -65 dB, and the response peak 320 is about -35 dB. The frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is a user-worn state has a response peak 330 corresponding to a frequency of about 56 Hz, and has a response peak 340 at a frequency of about 120 Hz. The response peak 330 is about -62 dB, and the response peak 340 is about -60 dB.

[0036] In step 220, if the operating state is a state where the user is not wearing the earphone, an instruction is generated to adjust the power consumption of the bone conduction earphone.

[0037] In some embodiments, step 220 may be performed by a control module (e.g., the control module 1430) of the bone conduction earphone. In some embodiments, the bone conduction earphone may include a feedback circuit, and the control module (e.g., the control module 1430) of the bone conduction earphone may generate a corresponding instruction in response to the operating state being a state where the user is not wearing the earphone, to control the feedback circuit to adjust the power consumption of the bone conduction earphone. In some embodiments, adjusting the power consumption of the bone conduction earphone may be achieved by pausing the playback of the bone conduction earphone, for example, the instruction generated by the control module may control the feedback circuit to pause the reception of an audio signal by the earphone core of the bone conduction earphone, or stop the terminal device from transmitting an audio signal to the earphone core of the bone conduction earphone, or turn off the power or some power consumption functions of the bone conduction earphone. By feeding back that the operating state of the bone conduction earphone is a state where the user is not wearing the earphone, and generating an instruction to adjust the power consumption of the bone conduction earphone, the power consumption of the bone conduction earphone may be reduced and the battery life of the bone conduction earphone may be improved.

[0038] In some embodiments, the discrimination model may determine whether the operating state of the bone conduction earphone is in a state where the user is not wearing it. Specifically, the vibration response characteristics of the earphone core may be input to the discrimination model, and then a determination result may be generated based on the output of the discrimination model, and the determination result may include that the operating state of the bone conduction earphone is in a state where the user is wearing it and that the operating state of the bone conduction earphone is in a state where the user is not wearing it. In some embodiments, the discrimination model may be a trained machine learning model. In some embodiments, the machine learning model may include a K-NearestNeighbor (KNN) model, a Bayesian model, a Decision Tree model, a Random Forest model, a Logistic Regression model, a Neural Network (NN) model, an Ensemble Learning model, or the like, or a combination thereof.

[0039] In some embodiments, the above-mentioned identification model can be obtained using a training method in which the vibration response characteristics of the earphone core that correspond to a predetermined operating state of the bone conduction earphone being worn by the user are used as training positive samples, the vibration response characteristics of the earphone core that correspond to a predetermined operating state of the bone conduction earphone being not worn by the user are used as training negative samples, and the training positive samples and the training negative samples are each trained using a machine learning model to obtain an identification model that can determine whether the operating state of the earphone is not worn by the user.

[0040] In some embodiments, an algorithm (e.g., a method for extracting the vibration response characteristic in step 120) may extract the vibration response characteristic of the earphone core and compare it with a predetermined vibration response characteristic to determine whether the operating state of the bone conduction earphone is a state where the user is not wearing it; the predetermined vibration response characteristic may be a vibration response characteristic (e.g., a resonant frequency, a response peak at a specific frequency, a quality factor, etc.) when the operating state of the bone conduction earphone is a state where the user is wearing it; and if there is a difference between the vibration response characteristic of the earphone core and the predetermined vibration response characteristic or the difference that exists is not within a certain threshold, it can be determined that the corresponding operating state is a state where the user is not wearing it.

[0041] In some embodiments, when the operating state is a user-worn state, the bone conduction earphone may operate normally, or the operating state of the bone conduction earphone may be fed back and optimized in a user-mis-worn state by further determining whether the operating state of the bone conduction earphone is a user-mis-worn state.

[0042] In some embodiments, the operating state of the bone conduction earphone may further include a good user fit state and a bad user fit state. The good user fit state is an operating state of the bone conduction earphone when it is correctly worn by the user. For example, the vibration output end of the earphone core of the bone conduction earphone fits perfectly to the skin of the user. For example, the earphone core of the bone conduction earphone is located in a specific area of ​​the skin of the user (for example, the earphone core is located in the front area of ​​the pinna of the user). The bad user fit state is an operating state of the bone conduction earphone when it is not correctly worn by the user. For example, only a part of the earphone core of the bone conduction earphone fits to the skin of the head of the user. For example, the earphone core is located outside the specific area of ​​the skin of the user (for example, behind the pinna of the user). FIG. 4 is a flowchart of a method for feeding back an operating state of a bone conduction earphone according to some embodiments of the present application. When it is determined that the operating state of the bone conduction earphone is a good user wearing state or a bad user wearing state, the method 400 for feeding back the operating state of the bone conduction earphone based on the vibration response characteristics of the earphone core may include the following steps 410 to 420.

[0043] In step 410, it is determined whether the operating state is a user misfit state based on the vibration response characteristics of the earphone core. In some embodiments, step 410 may be performed by a determination module (e.g., determination module 1420) of the bone conduction earphone.

[0044] In some embodiments, when the operation state of the bone conduction earphone is in a good user wearing state and a bad user wearing state, the earphone core and the skin of the user's head have different contact conditions, so the mechanical impedance of the skin also has different effects on the vibration of the earphone core. Therefore, the vibration signal of the earphone core collected by the vibration sensor is different when the operation state of the bone conduction earphone is in a good user wearing state and a bad user wearing state. Therefore, when the operation state of the bone conduction earphone is in a good user wearing state and a bad user wearing state, the earphone core has different vibration response characteristics (e.g., resonance frequency, response peak of a specific frequency, quality factor, etc.), and it can be determined whether the operation state of the bone conduction earphone is in a good user wearing state or a bad user wearing state based on the vibration response characteristics of the earphone core. In order to further explain the bone conduction earphone in a good user wearing state and a bad user wearing state, the following description will be made with reference to FIG. 5. FIG. 5 is a frequency response curve of the earphone core vibration when the operation state of the bone conduction earphone is in a good user wearing state and a frequency response curve of the earphone core vibration when the operation state of the bone conduction earphone is in a bad user wearing state according to some embodiments of the present application. The solid line in Fig. 5 is a frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is a good user wearing state, and the dashed line in Fig. 5 is a frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is a bad user wearing state. As shown in Fig. 5, there is a clear difference between the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is a good user wearing state and the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is a bad user wearing state, and the vibration response characteristics of the earphone core when the operating state of the bone conduction earphone is a good user wearing state and the vibration response characteristics of the earphone core when the operating state of the bone conduction earphone is a bad user wearing state are also different. For example, the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is a good user wearing state is flatter than the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is a bad user wearing state.For example, the frequency corresponding to the response peak of the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is in a good user wearing state is lower than the frequency corresponding to the response peak of the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is in a bad user wearing state. Specifically, the frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is in a bad user wearing state has a response peak 510 corresponding to a frequency of about 50 Hz, and has a response peak 520 at a frequency of about 80 Hz. The response peak 510 is about -84 dB, and the response peak 520 is about -63 dB. The frequency response curve of the earphone core vibration when the operating state of the bone conduction earphone is in a good user wearing state has a response peak 530 corresponding to a frequency of about 60 Hz, and has a response peak 540 at a frequency of about 160 Hz. The response peak 530 is about -65 dB, and the response peak 540 is about -45 dB. In addition, when the bone conduction earphone is not well fitted to the user, for example, when only a part of the structure of the earphone core fits the skin of the human body, a wave valley 550 appears in the frequency response curve of the bone conduction earphone. In some embodiments, when one or more wave valleys (e.g., wave valley 550) appear in the frequency response curve of the bone conduction earphone, it can also be characterized that the bone conduction earphone is not well fitted to the user.

[0045] In step 420, if the operating state is a user improper wearing state, the bone conduction earphone transmits the presentation information.

[0046] In some embodiments, step 420 may be performed by a control module (e.g., control module 1430) of the bone conduction earphone. In some embodiments, the control module may transmit presentation information, which may be received by the user to prompt the user to re-wear the bone conduction earphone or adjust the posture or position of wearing the bone conduction earphone, etc. In some embodiments, the bone conduction earphone may present to the user by vibration of the earphone core or reproduction of audio presentation words by the earphone core. In some embodiments, the bone conduction earphone may transmit presentation information to the user by a terminal device (e.g., mobile phone, computer, etc.) connected thereto by wire or wirelessly, and the form of the presentation information may include, but is not limited to, vibration, text, image, voice, etc. By feeding back that the operation state of the bone conduction earphone is in a user improper wearing state, the bone conduction earphone transmits presentation information to the user to prompt the user to re-wear the bone conduction earphone or adjust the posture or position of wearing the bone conduction earphone, etc., to avoid poor sound quality and quality of the sound caused by the user not wearing the bone conduction earphone correctly, and ensure the user's hearing experience. In some embodiments, when the operational state of the bone conduction earphone is in a good user fit state, the bone conduction earphone continues to maintain the good user fit state operational state and continues to operate.

[0047] In some embodiments, the discrimination model may determine whether the operating state of the bone conduction earphone is in a user poorly worn state. Specifically, the vibration response characteristics of the earphone core may be input into the discrimination model, and then a determination result may be generated based on the output of the discrimination model, and the determination result may include that the operating state of the bone conduction earphone is in a user good wearing state and that the operating state of the bone conduction earphone is in a user poorly worn state. In some embodiments, the discrimination model may be a trained machine learning model. In some embodiments, the machine learning model may include a K-NearestNeighbor (KNN) model, a Bayesian model, a Decision Tree model, a Random Forest model, a Logistic Regression model, a Neural Network (NN) model, an Ensemble Learning model, or the like, or a combination thereof.

[0048] In some embodiments, the above-mentioned identification model can be obtained using a training method in which the vibration response characteristics of the earphone core that correspond to a predetermined operating state of the bone conduction earphone being a good user-wear state are used as training positive samples, the vibration response characteristics of the earphone core that correspond to a predetermined operating state of the bone conduction earphone being a poor user-wear state are used as training negative samples, and the training positive samples and the training negative samples are each trained using a machine learning model to obtain an identification model that can determine whether the operating state of the earphone is a poor user-wear state.

[0049] In some embodiments, an algorithm may compare the vibration response characteristics of the earphone core with a predetermined vibration response characteristic to determine whether the operating state of the bone conduction earphone is in a user poorly fitted state, and the predetermined vibration response characteristic may be a vibration response characteristic (e.g., a resonant frequency, a response peak at a specific frequency, a quality factor, etc.) when the operating state of the bone conduction earphone is in a user good fitted state, and when there is a difference between the vibration response characteristics of the earphone core and the predetermined vibration response characteristic or the difference that exists is not within a certain threshold, it can be determined that the corresponding operating state is in a user poorly fitted state.

[0050] In some embodiments, feeding back the operating state of the bone conduction earphone may include adjusting a clamping force when the user wears the bone conduction earphone. Specifically, the operating state of the bone conduction earphone may be related to a clamping force when the user wears the bone conduction earphone, and the magnitude of the clamping force may affect the sound quality or volume of the sound the user hears through the bone conduction earphone and the comfort of the user wearing the bone conduction earphone. The clamping force when the user wears the bone conduction earphone may be the pressure of the earphone core against the user's skin. FIG. 6 is a flowchart of a method for feeding back the operating state of the bone conduction earphone according to some embodiments of the present application. When the operating state of the bone conduction earphone is related to a clamping force when the user wears the bone conduction earphone, a method 600 for feeding back the operating state of the bone conduction earphone based on the vibration response characteristics of the earphone core may include the following steps 610 to 620.

[0051] In step 610, it is determined whether the clamping force is within a predetermined range when the user is wearing the bone conduction earphone based on the vibration response characteristics of the earphone core.

[0052] In some embodiments, step 610 may be performed by a determination module (e.g., the determination module 1420) of the bone conduction earphone. In some embodiments, different clamping forces when the user wears the bone conduction earphone will cause different mechanical impedances of the skin, and the effects of different mechanical impedances of the skin on the vibration of the earphone core will also be different. Therefore, different clamping forces when the user wears the bone conduction earphone will cause different frequency response curves of the earphone core vibration collected by the vibration sensor, so that different clamping forces when the user wears the bone conduction earphone can correspond to different vibration response characteristics of the earphone core (e.g., resonant frequency, response peak of a specific frequency, quality factor, etc.), and based on the vibration response characteristics of the earphone core, it can be determined whether the clamping force when the user wears the bone conduction earphone is within a predetermined range. In some embodiments, the predetermined range may be 0.2N to 0.5N. In some embodiments, the predetermined range may be 0.25N to 0.45N. In some embodiments, the predetermined range may be 0.3N to 0.4N. Note that the predetermined range is not limited to the above range and can be adaptively adjusted according to the user's experience.

[0053] In order to further explain the bone conduction earphone when the clamping force is different when the user wears the bone conduction earphone, the following description will be made with reference to FIG. 7. FIG. 7 shows frequency response curves of earphone core vibrations corresponding to the case where the clamping force is large when the user wears the bone conduction earphone according to some embodiments of the present application, and frequency response curves of earphone core vibrations corresponding to the case where the clamping force is small when the user wears the bone conduction earphone. The solid line in FIG. 7 is the frequency response curve of earphone core vibrations corresponding to the case where the clamping force is small when the user wears the bone conduction earphone, and the dashed line in FIG. 7 is the frequency response curve of earphone core vibrations corresponding to the case where the clamping force is large when the user wears the bone conduction earphone. As shown in FIG. 7, there is an obvious difference between the frequency response curve of earphone core vibrations corresponding to the case where the clamping force is large when the user wears the bone conduction earphone and the frequency response curve of earphone core vibrations corresponding to the case where the clamping force is small, and the vibration response characteristics of the earphone core corresponding to the case where the clamping force is large when the user wears the bone conduction earphone are also different from the vibration response characteristics of the earphone core corresponding to the case where the clamping force is small when the user wears the bone conduction earphone. For example, the frequency response curve of the earphone core vibration when the clamping force is large when the user is wearing the bone conduction earphone is flatter than the frequency response curve of the earphone core vibration when the clamping force is small when the user is wearing the bone conduction earphone. Also, for example, the frequency corresponding to the response peak of the frequency response curve of the earphone core vibration when the clamping force is small when the user is wearing the bone conduction earphone is lower than the frequency corresponding to the response peak of the frequency response curve of the earphone core vibration when the clamping force is large when the user is wearing the bone conduction earphone. Specifically, the frequency response curve of the earphone core vibration when the clamping force is small when the user is wearing the bone conduction earphone has a response peak 710 at a frequency of about 45 Hz and a response peak 720 at a frequency of about 150 Hz. The response peak 710 is about -53 dB, and the response peak 720 is about -54 dB.The frequency response curve of the earphone core vibration when the clamping force is large when the user is wearing the bone conduction earphone has a response peak 730 at a frequency of about 50 Hz and a response peak 740 at a frequency of about 200 Hz. The response peak 730 is about -52 dB, and the response peak 740 is about -60 dB. In some embodiments, as can be seen from the combination of the frequency response curves of the earphone core vibration when the operating state of the bone conduction earphone in FIG. 5 is a good user wearing state, the frequency response curve of the earphone core vibration when the user is wearing the bone conduction earphone is flatter than the frequency response curve of the earphone core vibration when the clamping force is small or large when the user is wearing the bone conduction earphone, while the frequency corresponding to the response peak in the frequency response curve of the earphone core vibration when the user is wearing the good user wearing state is higher than the frequency corresponding to the response peak in the frequency response curve of the earphone core vibration when the clamping force is small or large when the user is wearing the bone conduction earphone. Furthermore, the frequency response curves of the earphone core vibration when the clamping force is small or large when the user wears the bone conduction earphone both have large troughs (e.g., trough 750, trough 760), which can also reflect the small or large clamping force when the user wears the bone conduction earphone.

[0054] In step 620, if the clamping force when the user wears the bone conduction earphone is not within a predetermined range, an instruction is generated to adjust a corresponding structure of the bone conduction earphone, thereby changing the clamping force when the user wears the bone conduction earphone.

[0055] In some embodiments, step 620 may be performed by a control module (e.g., control module 1430) of the bone conduction earphone. In some embodiments, the bone conduction earphone may include a feedback circuit and a structure for adjusting the clamping force, and the control module may, in response to the clamping force when the user is wearing the bone conduction earphone not being within the predetermined range, generate a corresponding instruction to control the feedback circuit to adjust the structure for adjusting the clamping force of the bone conduction earphone, thereby changing the clamping force when the user is wearing the bone conduction earphone. In some embodiments, the control module generates a corresponding instruction based on a difference between the clamping force and the predetermined range, to control the feedback circuit to accurately adjust the structure for adjusting the clamping force of the bone conduction earphone, thereby changing the clamping force when the user is wearing the bone conduction earphone. In some embodiments, the instruction generated by the control module may control the feedback circuit to adjust the back loop length or opening angle of the bone conduction earphone to adjust the clamping force when the user wears the bone conduction earphone, for example, if the clamping force is less than a predetermined range, the clamping force may be increased by increasing the back loop length or decreasing the back loop opening angle, and for example, if the clamping force is greater than the predetermined range, the clamping force may be decreased by decreasing the back loop length or increasing the back loop opening angle. In some embodiments, the bone conduction earphone may include a driving structure that can change the length and opening angle of the bone conduction earphone based on the instruction generated by the feedback circuit. For example, the driving structure may include a micromotor and an adjustment assembly (e.g., a contraction rod structure) that adjusts the back loop length or opening angle, and the micromotor has an output end connected to the adjustment assembly and can drive the adjustment assembly to increase or decrease the back loop length and opening angle.

[0056] In some embodiments, the discrimination model may determine whether the clamping force when the user wears the bone conduction earphone is within a predetermined range. Specifically, the vibration response characteristics of the earphone core may be input to the discrimination model, and then a parameter value characterizing the clamping force when the user wears the bone conduction earphone may be obtained based on the output of the discrimination model, and whether the parameter value is within a predetermined range may be determined. In some embodiments, the parameter value characterizing the clamping force when the user wears the bone conduction earphone may be a parameter that can reflect the magnitude of the clamping force or the range of the magnitude of the clamping force. In some embodiments, the discrimination model may be a trained machine learning model. In some embodiments, the machine learning model may include a K-NearestNeighbor (KNN) model, a Bayesian model, a Decision Tree model, a Random Forest model, a Logistic Regression model, a Neural Network (NN) model, an Ensemble Learning model, or the like, or a combination thereof.

[0057] In some embodiments, the above-mentioned identification model can be obtained in a training manner by collecting in advance the vibration response characteristics of the earphone core corresponding to different magnitudes of clamping force when a user is wearing a bone conduction earphone, using the collected vibration response characteristics of the multiple earphone cores as input data and the specific magnitude or magnitude range of the corresponding clamping force as output data, and training a machine learning model to obtain an identification model that can obtain a parameter value characterizing the clamping force when a user is wearing a bone conduction earphone based on the vibration response characteristics of the earphone core.

[0058] After obtaining a parameter value characterizing the clamping force when the user wears the bone conduction earphone through the identification model, the parameter value can be compared with a predetermined range to determine whether the parameter value is within the predetermined range. In some embodiments, the predetermined range may be a clamping force range that ensures that the user can wear the bone conduction earphone comfortably. In some embodiments, the clamping force range may be 0.25N to 0.45N. In some embodiments, the predetermined range may be 0.3N to 0.4N.

[0059] In some embodiments, an algorithm may directly compare the vibration response characteristic of the earphone core with a predetermined vibration response characteristic to determine whether the clamping force when the user wears the bone conduction earphone exceeds a predetermined range. The predetermined vibration response characteristic may be a vibration response characteristic of the earphone core (e.g., a resonant frequency, a response peak at a specific frequency, a quality factor, etc.) corresponding to the clamping force when the user wears the bone conduction earphone in the predetermined range, and if there is a difference between the vibration response characteristic of the earphone core and the predetermined vibration response characteristic or the difference is not within a certain threshold, it can be determined whether the clamping force when the user wears the bone conduction earphone corresponding to the vibration response characteristic of the earphone core is within the predetermined range.

[0060] By determining whether the clamping force related to the operating state of the bone conduction earphone is within a predetermined range and feeding back the corresponding operating state (e.g., adjusting the clamping force), it is possible to avoid a clamping force that is too small, which affects the efficiency of bone conduction, resulting in poor sound quality or low volume of the sound that the user can hear through the bone conduction earphone, and it is also possible to avoid a clamping force that is too large, which applies excessive pressure to the user's skin and causes discomfort to the user, thereby ensuring the user's hearing experience and wearing experience.

[0061] In some scenarios, due to different ages, whether users are fat, and different skin characteristics, the mechanical impedance of the skin does not match, and when different users wear the same bone conduction earphone, the mechanical impedance of the skin does not match, and the impact on the vibration of the earphone core is also different. As a result, even if different users wear the same bone conduction earphone and based on the same audio signal, the sounds they hear are different. In order to further explain the bone conduction earphone when different users wear the same bone conduction earphone, the following description will be made with reference to FIG. 8. FIG. 8 is a frequency response curve of the earphone core vibration when different users wear the same bone conduction earphone according to some embodiments of the present application. The solid line in FIG. 8 is the frequency response curve of the earphone core vibration when user A wears the bone conduction earphone, and the dashed line in FIG. 8 is the frequency response curve of the earphone core vibration when user B wears the bone conduction earphone. As shown in FIG. 8, the frequency response curves of the earphone core vibration when user A and user B wear the same bone conduction earphone are different, so that the earphone core has different vibration response characteristics when user A and user B wear the same bone conduction earphone. Specifically, the frequency response curve of the earphone core when user A wears the bone conduction earphone has a response peak 810 corresponding to a frequency of about 40 Hz, and has a response peak 820 at a frequency of about 180 Hz. The response peak 810 is about -48 dB, and the response peak 820 is about -50 dB. The frequency response curve of the earphone core when user B wears the bone conduction earphone has a response peak 830 corresponding to a frequency of about 42 Hz, and has a response peak 840 at a frequency of about 100 Hz. The response peak 830 is about -52 dB, and the response peak 840 is about -47 dB.

[0062] In some other scenarios, the bone conduction earphone has different mechanical impedances depending on the position of the user's skin, and when the user repeatedly wears the bone conduction earphone, the fit position between the earphone core and the skin changes, and the mechanical impedance of different positions on the skin also has different effects on the vibration of the earphone core, so that when the same user repeatedly wears the bone conduction earphone, there will be differences even based on the same audio signal. In order to further explain the bone conduction earphone when the user repeatedly wears the bone conduction earphone, the following description will be made with reference to FIG. 9. FIG. 9 is a frequency response curve of the earphone core vibration when the same user wears the bone conduction earphone multiple times according to some embodiments of the present application. The solid line in FIG. 9 is the frequency response curve of the earphone core vibration when the user wears the bone conduction earphone for the first time, and the dashed line in FIG. 9 is the frequency response curve of the earphone core vibration when the user wears the bone conduction earphone for the second time. As can be seen from Fig. 9, there is a difference between the frequency response curve of the earphone core vibration when the user wears the bone conduction earphone for the first time and the frequency response curve of the earphone core vibration when the user wears the bone conduction earphone for the second time, so the vibration response characteristics of the earphone core when the user wears the bone conduction earphone for the first time and the vibration response characteristics of the earphone core when the user wears the bone conduction earphone for the second time are also different. For example, there is a difference between the vibration amplitude of the earphone core at frequencies of 60Hz to 100Hz when the user wears the bone conduction earphone for the first time and the vibration amplitude of the earphone core at frequencies of 60Hz to 100Hz when the user wears the bone conduction earphone for the second time. Due to this difference, the sound heard when the user wears the bone conduction earphone for the first time and the second time is different (for example, the sound effect is different).

[0063] Ensuring that the sounds heard by different users are consistent when the same bone conduction earphone is worn by the same user or when the same user wears the bone conduction earphone repeatedly can be achieved by feeding back the operating state of the bone conduction earphone based on the vibration response characteristics of the earphone core. Figure 10 is a flowchart of a method for feeding back the operating state of the bone conduction earphone according to some embodiments of the present application. When different users wear the same bone conduction earphone or when the same user wears the bone conduction earphone repeatedly, a method 1000 for feeding back the operating state of the bone conduction earphone based on the vibration response characteristics of the earphone core may include the following steps 1010 to 1020.

[0064] At step 1010, a difference between the vibration response characteristic of the earphone core and a target vibration response characteristic is identified.

[0065] In some embodiments, step 1010 may be performed by a determination module (e.g., determination module 1420) of the bone conduction earphone. In some embodiments, the target vibration response characteristic may be a preset vibration response characteristic of an earphone core of the bone conduction earphone. In some embodiments, an algorithm may calculate the difference between the actual vibration response characteristic of the earphone core and the target vibration response characteristic, and the difference between the actual vibration response characteristic of the earphone core and the target vibration response characteristic may include, but is not limited to, a difference in resonant frequency, a difference in response peaks at specific frequencies, a difference in quality factor, etc.

[0066] In step 1020, EQ adjustments are made to the audio signal input to the earphone core based on the difference.

[0067] In some embodiments, step 1020 may be performed by a control module (e.g., control module 1430) of the bone conduction earphone. The EQ is an equalizer that can adjust the amplification amount of the electrical signal of various frequency components respectively, and the EQ adjustment is to divide the audio signal into multiple frequency bands and then adjust (e.g., amplify or attenuate) these frequency bands to achieve a high sound effect. In some embodiments, the control module may compensate with EQ based on the difference between the actual vibration response characteristic and the target vibration response characteristic of the earphone core, and the compensation EQ can act on the audio signal to perform EQ adjustment on the original audio signal, and the earphone core generates vibration in response to the adjusted audio signal, so that the user can hear the ideal sound through the bone conduction earphone.

[0068] In some embodiments, feeding back the operating state of the bone conduction earphone may include adjusting the amplitude of the audio signal input to the earphone core. Specifically, the amplitude of the bone conduction earphone is related to the input voltage of the earphone core. For example, the higher the input voltage of the earphone core, the higher the amplitude of the earphone core, and the lower the input voltage of the earphone core, the lower the input voltage of the earphone core. The input voltage of the earphone core affects the vibration amplitude of the earphone core, and if the vibration amplitude of the earphone core is too large, it will cause discomfort to the user when wearing it, which will eventually impair the user's hearing and damage the earphone core, and if the vibration amplitude of the earphone core is too small, it will affect the bone conduction efficiency and the volume of the sound heard by the user will be low. FIG. 11 is a flowchart of a method for feeding back the operating state of the bone conduction earphone according to some embodiments of the present application. When the operating state of the bone conduction earphone is the input voltage of the earphone core, the method 1100 for feeding back the operating state of the bone conduction earphone based on the vibration response characteristics of the earphone core may include the following steps 1110 to 1130.

[0069] At step 1110, a parameter value characterizing an input voltage of the earphone core is obtained based on a vibration response characteristic of the earphone core. In some embodiments, step 1110 may be performed by a determination module (e.g., determination module 1420) of the bone conduction earphone.

[0070] In some embodiments, different input voltages of the earphone core can affect the vibration amplitude of the earphone core, so that different input voltages of the earphone core can correspond to different vibration response characteristics of the earphone core. Therefore, a parameter value characterizing the input voltage of the earphone core can be obtained based on the vibration response characteristics of the earphone core, and it can be determined whether the parameter value is at a voltage threshold. In some embodiments, the voltage threshold can be a maximum voltage that does not cause distortion or crackling in the sound emitted from the bone conduction earphone. For example, in some embodiments, the voltage threshold is a maximum voltage that prevents the sound pressure level of the sound emitted from the bone conduction earphone from exceeding a specific sound pressure level. In some embodiments, the specific sound pressure level range can be 60 dB to 100 dB. Preferably, the specific sound pressure level range can be 70 dB to 90 dB. More preferably, the specific sound pressure level range can be 75 dB to 95 dB. In some embodiments, the parameter value characterizing the input voltage of the earphone core can be a specific magnitude or a magnitude range of the input voltage of the earphone core, and can be the vibration amplitude of the earphone core or the sound pressure level of the entire output of the earphone core. Regarding how to obtain the parameter value characterizing the input voltage of the earphone core based on the vibration response characteristics of the earphone core, the above-mentioned method of obtaining the parameter value characterizing the clamping force when the user wears the bone conduction earphone can be referred to, and the description is omitted here. Note that the voltage threshold and the specific sound pressure level can be adaptively adjusted based on the actual application situation and / or the user's experience, and are not further limited here.

[0071] In step 1120, it is determined whether the parameter value is at the voltage threshold.

[0072] In some embodiments, step 1120 may be performed by a determination module (e.g., determination module 1420) of the bone conduction earphone. In some embodiments, the determination module may compare the parameter value with a voltage threshold to determine whether the parameter value is at the voltage threshold. In some embodiments, the voltage threshold may be a value or range of input voltage of the earphone core that ensures a comfortable fit for the user. In some embodiments, the voltage threshold may be a value or range of input voltage of the earphone core that ensures that the earphone core is not damaged. In some embodiments, the voltage threshold may be a value or range of input voltage of the earphone core that protects the user's hearing, for example, when the parameter value is at the voltage threshold, the overall output of the earphone core does not exceed a certain limited sound pressure level so as to protect the user's hearing (e.g., for children's earphones, the overall sound pressure level is required to be as low as possible and not exceed 85 dB).

[0073] In step 1130, if the parameter value is not at the voltage threshold, the amplitude of the audio signal input to the earphone core is adjusted.

[0074] In some embodiments, step 1130 may be performed by a control module (e.g., control module 1430) of the bone conduction earphone. In some embodiments, the bone conduction earphone may include a feedback circuit, and the control module may generate a corresponding instruction in response to the parameter value not being at the voltage threshold to control the feedback circuit to adjust the amplitude of the audio signal input to the earphone core. For example, the feedback circuit may limit the amplitude of the audio signal input to the earphone core to limit the vibration amplitude of the earphone core and control the playback volume of the bone conduction earphone, to avoid the vibration amplitude of the earphone core being too large, causing discomfort to the user, thus impairing the user's hearing and damaging the earphone core. Also, for example, the feedback circuit may amplify the amplitude of the audio signal input to the earphone core to increase the playback volume of the bone conduction earphone and improve the sound quality.

[0075] In some embodiments, feeding back the operating state of the bone conduction earphone may include feeding back the physiological state and parameters of the user. Specifically, different vibration response characteristics of the earphone core may correspond to different mechanical impedances of the skin, and the mechanical impedance of the skin may reflect the physiological state of the human body to a certain extent. Therefore, by determining the vibration response characteristics of the earphone core when the user is wearing the bone conduction earphone, the corresponding mechanical impedance of the skin can be determined, and the physiological state of the user can be determined based on the mechanical impedance of the skin. For example, it can be determined whether the user is elderly and whether the user is obese. FIG. 12 is a flowchart of a method for feeding back the operating state of the bone conduction earphone according to some embodiments of the present application. When feeding back the physiological state and parameters of the user using the bone conduction earphone, the method 1200 for feeding back the operating state of the bone conduction earphone based on the vibration response characteristics of the earphone core may include the following steps 1210 to 1220.

[0076] At step 1210, a parameter value associated with a physiological parameter of the user is obtained based on the vibration response characteristics of the earphone core.

[0077] In some embodiments, step 1210 may be performed by a determination module (e.g., determination module 1420) of the bone conduction earphone. In some embodiments, the physiological parameter of the user is a parameter of the mechanical impedance of the skin in contact with the earphone core. The parameter value related to the physiological parameter of the user may include the mass, elasticity, damping, etc. of the mechanical impedance of the skin in contact with the earphone core, and the parameter value may reflect whether the user is overweight, age, etc. Regarding how to obtain the parameter value related to the physiological parameter of the user based on the vibration response characteristics of the earphone core, the above-mentioned method of obtaining a parameter value characterizing the clamping force when the user wears the bone conduction earphone may be referred to, and the description will be omitted here.

[0078] In step 1220, the auxiliary module of the bone conduction earphone is turned on or off based on the parameter value.

[0079] In some embodiments, step 1220 may be performed by a control module (e.g., control module 1430) of the bone conduction earphone. In some embodiments, the control module can determine a change in the physiological state of the user based on the obvious changes in the parameter values ​​in a short period of time, and then turn on the corresponding auxiliary module based on the change in the physiological state of the user, and the auxiliary module can prompt the user to pay attention to the change in the physiological state, for example, the control module can determine whether the user is getting fatter or thinner based on the changes in elasticity and damping of the mechanical impedance of the skin, and prompt the user to pay attention through the auxiliary module. In some embodiments, the control module can determine whether the user is elderly or young based on the parameter values, and if the user is elderly, turn on the auxiliary module to have the auxiliary module perform some humanization functions, the humanization functions include, but are not limited to, fall detection, audio warning, automatic gain control, etc. For example, the fall detection of the auxiliary module can predict the fall of the elderly and issue an audio warning to the elderly, or actively make a rescue call or notify emergency contacts after detecting the fall of the elderly. For example, the automatic gain control of the auxiliary module can automatically adjust the vibration amplitude of the earphone core when the user is elderly, thereby avoiding the vibration amplitude of the earphone core being too large and causing discomfort to the elderly when wearing it.

[0080] In addition, the method for optimizing the operating state of the bone conduction earphone according to the present application may realize a single function by including a single method for feeding back the operating state of the bone conduction earphone as described above, or may realize multiple functions simultaneously by including multiple methods for feeding back the operating state of the bone conduction earphone as described above. The functions realized by the method for feeding back the operating state of the bone conduction earphone may include adjusting the power consumption of the bone conduction earphone, informing the user to wear the bone conduction earphone again, adjusting the clamping force when the user wears the bone conduction earphone, performing EQ adjustment on the audio signal, adjusting the amplitude of the audio signal, monitoring the physiological state of the user, etc., or a combination thereof. The order of feeding back various operating states of the bone conduction earphone can be adaptively adjusted according to the actual situation. For example, in some embodiments, first, it may be detected and fed back whether the bone conduction earphone is in a wearing state, and then it may be detected and fed back one or more of whether the bone conduction earphone is well worn by the user, the magnitude of the clamping force, the voltage, etc. Also, for example, multiple operating states of the bone conduction earphone may be determined simultaneously. In addition, detection and feedback of the operating status of the bone conduction earphone may be performed in real time, once every certain period of time (e.g., 3 s, 2 min, etc.), or based on a user's input command.

[0081] In some embodiments, the method for optimizing the working state of the bone conduction earphone according to the present application further includes using the vibration sensor to perform some additional functions, which may include, but are not limited to, removing echo, picking up the user's voice signal, detecting falls, helping to realize spatial audio, etc.

[0082] In some embodiments, the vibration sensor may eliminate echo. Specifically, the vibration sensor picks up the vibration of the earphone core as a microphone, and feeds back the vibration to the earphone core to eliminate it, so as to prevent the sound emitted from the earphone core from being further transmitted to the earphone core and causing echo or howling. In this case, the vibration sensor can select a position close to the earphone core, and directly pick up and eliminate the vibration near the earphone core.

[0083] In some embodiments, the vibration sensor may pick up the user's voice signal. Specifically, since the earphone core fits the skin of the skull, when the user wears the bone conduction earphone and speaks, the voice can be transmitted in the opposite direction to the earphone core through the skull. In this case, when the vibration sensor picks up the vibration of the earphone core, the user's spoken voice can be picked up in the same way. By the vibration sensor picking up the user's voice signal in a vibration manner, it can resist external air conduction noise, and compared with the conventional air conduction microphone, picking up the speaker's voice signal in a vibration manner is basically free from external noise interference.

[0084] In some embodiments, the vibration sensor may detect a fall. In some embodiments, the vibration sensor may be a single-axis vibration sensor or a multi-axis sensor such as a three-axis vibration sensor. In some embodiments, the vibration sensor may also be a rotational angular velocity vibration sensor. In some embodiments, the vibration sensor may detect a sudden change in acceleration that occurs when a user falls or is about to fall, thereby predicting that a user, especially an elderly person, may fall. Furthermore, the bone conduction earphone may issue a corresponding warning or notify an emergency contact based on the fall detection of the vibration sensor.

[0085] In some embodiments, the vibration sensor may assist in implementing spatial audio, which requires first determining the rotational orientation of the user's head using a gyroscope, and the vibration sensor may include a gyroscope. In some embodiments, the vibration sensor may be multi-axis translational or rotational.

[0086] In addition, the above additional functions may be performed by one vibration sensor or by multiple vibration sensors, respectively. In some embodiments, the vibration sensor can work in cooperation with other sensors, for example, the vibration sensor can be combined with a physiological sensor to jointly detect a physiological state of a user when the user wears a bone conduction earphone.

[0087] The present specification further provides a method for training a discriminative model. Figure 13 is a flowchart of a method for training a discriminative model according to some embodiments of the present application. As shown in Figure 13, a method 1300 for training a discriminative model may include the following steps 1310 to 1340.

[0088] In step 1310, sample information is obtained.

[0089] In some embodiments, the sample information may include at least two user wearing records, and the user wearing records may include: an operating state of the bone conduction earphone and a corresponding frequency response curve of the earphone core vibration, a clamping force when the user is wearing the bone conduction earphone and a corresponding frequency response curve of the earphone core vibration, an input voltage of the earphone core and a corresponding frequency response curve of the earphone core vibration, etc.

[0090] In step 1320, a sample type, including a positive sample type or a negative sample type, for each of the at least two user wearing records is determined based on the sample information.

[0091] In some embodiments, the operating state of the bone conduction earphone may be determined as a positive sample type when the user wears the earphone, and may be determined as a negative sample type when the user does not wear the earphone. In some embodiments, the operating state of the bone conduction earphone may be determined as a positive sample type when the user wears the earphone well, and may be determined as a negative sample type when the user does not wear the earphone well.

[0092] In step 1330, sample characteristic information corresponding to each of the at least two user wearing records is determined based on the sample information.

[0093] In some embodiments, the sample characteristic information may include the vibration response characteristics of the earphone core and the operating state of the bone conduction earphone. In some embodiments, the vibration response characteristics of the earphone core may include, but are not limited to, one or more of the resonant frequency of the earphone core, a response peak at a specific frequency, a quality factor, and an input voltage. In some embodiments, the operating state of the bone conduction earphone may include a user-worn state / a user-unworn state, a user-worn state / a user-worn state, a clamping force when the user is wearing the bone conduction earphone, an input voltage of the earphone core, and the like. In some embodiments, the vibration response characteristics may be directly extracted from the sample information corresponding to the user's wearing record. In some embodiments, the operating state of the bone conduction earphone may be determined based on the vibration response characteristics. For details of determining the operating state of the bone conduction earphone based on the vibration response characteristics, reference may be made to Figures 1 to 11 of the specification of the present application and their related descriptions.

[0094] At step 1340, a discrimination model is determined based on the sample characteristic information and the sample type for each of the at least two user wearing records.

[0095] In some embodiments, an initial machine learning model may be trained using the sample characteristic information as input and the sample types of each of the at least two user wearing records as output to determine a discrimination model. In some embodiments, the discrimination model may include at least one of a Naive Bayes model, a Linear Regression model, a Decision Tree model, or a Support Vector Machine model.

[0096] 14 is a module diagram of a bone conduction earphone according to some embodiments of the present application. The bone conduction earphone 1400 may include an acquisition module 1410, a determination module 1420, and a control module 1430.

[0097] In some embodiments, the acquisition module 1410 may acquire an audio signal and a vibration signal. In addition, the acquisition module 1410 may include an earphone core and at least one vibration sensor, and can acquire an audio signal from a storage unit inside the bone conduction earphone or a terminal device (e.g., a mobile phone, a computer, an MP3, etc.) connected to the bone conduction earphone by wire or wirelessly, the earphone core can generate vibration in response to the audio signal, and the acquisition module 1410 can acquire a vibration signal based on the vibration of the earphone core by the at least one vibration sensor.

[0098] In some embodiments, the determination module 1420 may determine a vibration response characteristic of the earphone core based on the audio signal and the vibration signal. In some embodiments, the vibration response characteristic of the earphone core may include at least one of a resonant frequency of the earphone core, a response peak at a specific frequency, a quality factor, and an input voltage. In some embodiments, if the operational state of the bone conduction earphone includes a user-worn state and a user-not-worn state, the determination module 1420 may determine whether the operational state of the bone conduction earphone is a user-not-worn state based on the vibration response characteristic of the earphone core. In some embodiments, if the operational state of the bone conduction earphone includes a user-worn state and a user-not-worn state, the determination module 1420 may determine whether the operational state of the bone conduction earphone is a user-not-worn state based on the vibration response characteristic of the earphone core. In some embodiments, if the operational state of the bone conduction earphone is related to a clamping force when the user is wearing the bone conduction earphone, the determination module 1420 may determine whether the clamping force when the user is wearing the bone conduction earphone is within a predetermined range. In some embodiments, the determination module 1420 may identify a difference between the vibration response characteristic of the earphone core and a target vibration response characteristic. In some embodiments, if the operating state of the bone conduction earphone includes an input voltage, the determination module 1420 may obtain a parameter value characterizing an input voltage of the earphone core based on the vibration response characteristic of the earphone core and determine whether the parameter value is at a voltage threshold. In some embodiments, the determination module 1420 may obtain a parameter value related to a physiological parameter of the user based on the vibration response characteristic of the earphone core.

[0099] In some embodiments, the control module 1430 may feedback the operating state of the bone conduction earphone based on the vibration response characteristic of the earphone core. In some embodiments, when the operating state of the bone conduction earphone is a user-unworn state, the control module 1430 may generate an instruction to adjust the power consumption of the bone conduction earphone. In some embodiments, when the operating state of the bone conduction earphone is a user-misworn state, the control module 1430 may control the bone conduction earphone to transmit the presentation information. In some embodiments, when the clamping force when the user is wearing the bone conduction earphone is not within a predetermined range, the control module 1430 may change the clamping force when the user is wearing the bone conduction earphone by generating an instruction to adjust a corresponding structure of the bone conduction earphone. In some embodiments, the control module 1430 may make an EQ adjustment to the audio signal input to the earphone core based on the difference between the vibration response characteristic of the earphone core and the target vibration response characteristic. In some embodiments, when the parameter value characterizing the input voltage of the earphone core is not within a voltage threshold, the control module 1430 may adjust the amplitude of the audio signal input to the earphone core. In some embodiments, the control module 1430 may turn on or off an auxiliary module of the bone conduction earphones.

[0100] It should be noted that the above description of the modules included in the bone conduction earphone is merely for describing modules related to optimizing the operating state of the bone conduction earphone. In some embodiments, the bone conduction earphone 1400 may include other modules, such as a training module for training a discrimination model, a signal processing module for processing an audio signal or a vibration signal, and a power supply module for supplying power to the bone conduction earphone. The description of other modules of the bone conduction earphone is omitted here.

[0101] It should be noted that the above description of the modules included in the bone conduction earphones is merely for convenience of description and cannot limit the scope of the present application to the embodiments listed. It should be understood that after understanding the principle of the bone conduction earphones, a person skilled in the art can arbitrarily combine each module or form a subsystem and connect it to other modules without departing from the principle. In some embodiments, the acquisition module 1410, the determination module 1420, and the control module 1430 disclosed in FIG. 14 may be different modules of the bone conduction earphones, and one module may realize the functions of two or more modules described above. For example, each module may share one storage module or have its own storage module. All such modifications are within the scope of protection of the present application.

[0102] Although the basic concept has been described above, it is clear to those skilled in the art that the detailed disclosure above is merely provided as an example and is not intended to limit the present application. Although not expressly described herein, those skilled in the art may make various changes, improvements and modifications to the present application. These changes, improvements and modifications are intended to be suggested by the present application and therefore are within the spirit and scope of the exemplary embodiments of the present application.

[0103] Also, certain terms are used herein to describe embodiments of the present application. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the present application. Thus, it is emphasized and understood that references to two or more of "one embodiment," "one embodiment," or "one alternative embodiment" in various parts of this specification do not necessarily all refer to the same embodiment. Also, certain features, structures, or characteristics in one or more embodiments of the present application may be combined as appropriate.

[0104] Also, as will be appreciated by those skilled in the art, aspects of the present application may be illustrated and described in several patentable classes or contexts, including any new and useful process, machine, manufacture, or combination of matter, or any new and useful improvement thereto. Thus, aspects of the present application may be implemented entirely in hardware, entirely in software (including firmware, resident software, microcode, etc.), or a combination of hardware and software. Any of the above hardware or software may be referred to as a "data block," "module," "engine," "unit," "assembly," or "system." Also, aspects of the present application may take the form of a computer program product embodied in one or more computer-readable mediums that contain computer-readable program code.

[0105] The computer storage medium may include a propagated data signal, propagated on baseband or as part of a carrier wave, for carrying the computer program code. The propagated signal may include various forms, such as electromagnetic signals, optical signals, or suitable combinations. The computer storage medium may be any computer readable medium other than a computer readable storage medium, which may be connected to an instruction execution system, device, or equipment to realize the communication, propagation, or transmission of the program used. The program code on the computer storage medium may be propagated via any suitable medium, including wireless, cable, fiber optic cable, RF, or similar media, or any combination of the above media.

[0106] The computer program code necessary for the operation of each part of this application may be coded in one or more programming languages, including object-oriented programming languages ​​such as Java, Scala, Smalltalk, Eiffel, JADE, Emerald, C++, C#, VB.NET, Python, traditional procedural programming languages ​​such as C, Visual Basic, Fortran 2003, Perl, COBOL 2002, PHP, ABAP, dynamic programming languages ​​such as Python, Ruby and Groovy, or other programming languages. The program code may run entirely on the user's computer, on the user's computer as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the latter case, the remote computer may be connected to the user's computer by any form of network, such as a local area network (LAN) or wide area network (WAN), may be connected to an external computer (e.g., via the Internet), may be in a cloud computing environment, may be used as a service, such as Software as a Service (SaaS).

[0107] Additionally, unless expressly stated in the claims, the order of enumeration of processing elements or sequences described herein, the use of alphanumeric characters, or the use of other designations, do not limit the order of procedures and methods of the present application. While the above disclosure describes through various examples what are presently believed to be various useful embodiments of the invention, it should be understood that such details are merely for the purpose of illustration and that the appended claims are not limited to the disclosed embodiments, but on the contrary are intended to cover all modifications and equivalent combinations within the spirit and scope of the embodiments of the present application. For example, the system assembly described above may be implemented by a hardware device, but may also be implemented as a software-only solution, for example, by installing the described system on an existing server or mobile device.

[0108] Similarly, in the foregoing description of embodiments of the present application, it should be understood that various features may be grouped together in a single embodiment, figure, or description for the purpose of simplifying the application and facilitating an understanding of one or more embodiments of the present invention. This method of disclosure, however, should not be interpreted as reflecting an intention that the claimed subject matter requires more features than are recited in each claim. Indeed, an embodiment may have fewer than all features of a single embodiment disclosed above.

[0109] In some embodiments, numbers describing the number of components and attributes are used, and it is understood that the numbers describing such embodiments are modified in some instances by the modifiers "about," "approximately," or "generally." Unless otherwise specified, "about," "approximately," or "generally" indicate that the numbers are allowed to vary by ±20%. Thus, in some embodiments, all numerical parameters used in the specification and claims are approximations that may vary depending on the characteristics required for a particular embodiment. In some embodiments, the numerical parameters should be calculated taking into account the number of significant digits stated and ordinary rounding techniques should be applied. In some embodiments, the numerical ranges and parameters determining the ranges are approximations; however, in specific embodiments, such numerical values ​​are set as precisely as possible.

[0110] All patents, patent applications, published patent applications, and other materials such as articles, books, specifications, publications, documents, etc. referenced in this application are incorporated herein by reference in their entirety, except for prosecution history documents that are inconsistent or inconsistent with the content of this application, and documents that may have a limiting effect on the broadest scope of the claims of this application (now or later related to this application). In addition, if the explanations, definitions, and / or use of terms in the accompanying documents of this application are inconsistent or inconsistent with the content set forth in this application, the explanations, definitions, and / or use of terms in this application shall control.

[0111] Finally, it should be understood that the embodiments described herein are merely illustrative of the principles of the embodiments of the present application. Other variations are possible within the scope of the present application. Thus, by way of example, and not of limitation, alternative configurations of the embodiments of the present application may be considered consistent with the teachings of the present application. Thus, the embodiments of the present application are not limited to the embodiments expressly introduced and described herein. [Explanation of symbols]

[0112] 1400 Bone conduction earphones 1410 Acquisition Module 1420 Decision Module 1430 Control Module

Claims

1. A method for optimizing the operating state of a bone conduction earphone, the bone conduction earphone including an earphone core and at least one vibration sensor, the method comprising: acquiring, with the at least one vibration sensor, a vibration signal derived at least in part from vibrations generated by the earphone core in response to an audio signal, the vibrations of the earphone core being configured to be transmitted to a user wearing the bone conduction earphone by way of bone conduction; determining a vibration response characteristic of the earphone core based on the vibration signal and the audio signal; feeding back an operating state of the bone conduction earphone based on a vibration response characteristic of the earphone core, the vibration signal being obtained after the earphone core is coupled with the skin of a human body; Including, The step of determining a vibration response characteristic of the earphone core comprises: determining a frequency response curve of a vibration of the earphone core based on the vibration signal and the audio signal; determining a vibration response characteristic of the earphone core based on a frequency response curve of a vibration of the earphone core; Including, A method comprising:

2. 2. The method of claim 1, wherein the vibration response characteristics include at least one of a resonant frequency of the earphone core, a response peak at a particular frequency, a quality factor, and an input voltage.

3. The operation state of the bone conduction earphone includes a user-worn state and a user-unworn state, and the step of feeding back the operation state of the bone conduction earphone based on the vibration response characteristic of the earphone core includes: determining whether the operating state is a user-unworn state based on a vibration response characteristic of the earphone core; 2. The method of claim 1, further comprising: generating an instruction to adjust power consumption of the bone conduction earphone when the operating state is a state where the earphone is not worn by a user.

4. determining whether the operating state is a state where the earphone is not worn by a user based on a vibration response characteristic of the earphone core, inputting the vibration response characteristics of the earphone core into an identification model; generating a decision result based on an output of the discriminative model; 4. The method of claim 3, comprising:

5. The operation state of the bone conduction earphone includes a user good wearing state and a user bad wearing state, and the step of feeding back the operation state of the bone conduction earphone based on the vibration response characteristic of the earphone core includes: determining whether the operating state is a user poor fit state based on a vibration response characteristic of the earphone core; The method of claim 1 , further comprising: when the operating state is a user misfit state, the bone conduction earphone transmits presentation information.

6. determining whether the operating state is a user poor fit state based on a vibration response characteristic of the earphone core, inputting the vibration response characteristics of the earphone core into an identification model; generating a decision result based on an output of the discriminative model; 6. The method of claim 5, comprising:

7. The operating state of the bone conduction earphone is related to a clamping force when the user wears the bone conduction earphone, and the step of feeding back the operating state of the bone conduction earphone based on a vibration response characteristic of the earphone core includes: determining whether a clamping force is within a predetermined range when a user wears the bone conduction earphone based on a vibration response characteristic of the earphone core; and if the clamping force is not within the predetermined range, generating an instruction to adjust a corresponding structure of the bone conduction earphone to change the clamping force when the user is wearing the bone conduction earphone.

8. The step of determining whether a clamping force when a user wears the bone conduction earphone is within a predetermined range based on a vibration response characteristic of the earphone core includes: inputting the vibration response characteristics of the earphone core into an identification model; obtaining parameter values ​​characterizing a clamping force when a user is wearing the bone conduction earphone based on an output of the discriminative model; determining whether the parameter value is within the predetermined range; 8. The method of claim 7, comprising:

9. The step of feeding back an operating state of the bone conduction earphone based on a vibration response characteristic of the earphone core includes: identifying a difference between a vibration response characteristic of the earphone core and a target vibration response characteristic; performing an EQ adjustment on the audio signal input to the earphone core based on the difference; 2. The method of claim 1, comprising:

10. The operating state of the bone conduction earphone includes an input voltage of the earphone core, and the step of feeding back the operating state of the bone conduction earphone based on a vibration response characteristic of the earphone core includes: obtaining a parameter value characterizing an input voltage of the earphone core based on a vibration response characteristic of the earphone core; determining whether the parameter value is at a voltage threshold; and adjusting an amplitude of an audio signal input to the earphone core if the parameter value is not at the voltage threshold.

11. The step of feeding back an operating state of the bone conduction earphone based on a vibration response characteristic of the earphone core includes: obtaining a parameter value related to a physiological parameter of the user based on a vibration response characteristic of the earphone core; turning on or off an auxiliary module of the bone conduction earphone based on the parameter value; 2. The method of claim 1, comprising:

12. A bone conduction earphone including an acquisition module, a determination module and a control module, The acquisition module is configured to acquire, with at least one vibration sensor, a vibration signal derived at least in part from vibrations generated by an earphone core in response to an audio signal, and the vibrations of the earphone core are transmitted to a user wearing the bone conduction earphone by way of bone conduction; The determination module determines a vibration response characteristic of the earphone core based on the vibration signal and the audio signal; The control module feeds back an operating state of the bone conduction earphone based on a vibration response characteristic of the earphone core; and The vibration signal is obtained after the earphone core is coupled with the skin of a human body; Determining the vibration response characteristic of the earphone core comprises: determining a frequency response curve of a vibration of the earphone core based on the vibration signal and the audio signal; determining a vibration response characteristic of the earphone core based on a frequency response curve of a vibration of the earphone core; Bone conduction earphones that feature:

13. The operation state of the bone conduction earphone includes a user-worn state and a user-unworn state, and feeding back the operation state of the bone conduction earphone based on the vibration response characteristics of the earphone core is The determination module determines whether the operating state is a user-unworn state based on a vibration response characteristic of the earphone core; and The bone conduction earphone according to claim 12, further comprising: when the operating state is a state where the bone conduction earphone is not worn by a user, the control module generates an instruction to adjust power consumption of the bone conduction earphone.

14. The operating state of the bone conduction earphone includes a user good wearing state and a user bad wearing state, and feeding back the operating state of the bone conduction earphone based on the vibration response characteristic of the earphone core, The determination module determines whether the operating state is a user poor fit state based on a vibration response characteristic of the earphone core; and When the operating state is a user poor wearing state, the control module controls the bone conduction earphone to transmit presentation information; 13. The bone conduction earphone according to claim 12, further comprising:

15. The operating state of the bone conduction earphone is related to a clamping force when the user wears the bone conduction earphone, and the operating state of the bone conduction earphone is fed back based on a vibration response characteristic of the earphone core. The determination module determines whether a clamping force is within a predetermined range when a user wears the bone conduction earphone based on a vibration response characteristic of the earphone core; If the clamping force is not within the predetermined range, the control module generates an instruction to adjust a corresponding structure of the bone conduction earphone to change the clamping force when the user wears the bone conduction earphone; 13. The bone conduction earphone according to claim 12, further comprising:

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