A method for optimizing the working state of a bone conduction earphone

Abstract

The application discloses a method for optimizing the working state of a bone conduction earphone, characterized in that the bone conduction earphone comprises an earphone core and at least one vibration sensor, and the method comprises the following steps: acquiring a vibration signal through the at least one vibration sensor, wherein the vibration signal is at least partially derived from the vibration generated by the earphone core in response to an audio signal, and 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 the vibration response characteristics of the earphone core based on the vibration signal and the audio signal; and feeding back the working state of the bone conduction earphone based on the vibration response characteristics of the earphone core.

Description

[0001] Cross-references

[0002] This application claims priority to Chinese application No. 202110033059.0, filed on January 11, 2021, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of acoustics, and in particular to a method for optimizing the working state of bone conduction headphones. Background Technology

[0004] Unlike traditional air conduction headphones, bone conduction headphones work by having the earpiece conform to the user's scalp, transmitting vibrations directly to the ossicles in the middle ear or the cochlea in the inner ear through the user's bones, allowing them to hear sound. However, different operating conditions can negatively impact the functionality of bone conduction headphones. For example, if the earpiece doesn't fit properly against the user's scalp, the user may not hear sound or will experience poor sound quality, thus reducing their auditory and wearing experience. Therefore, accurately determining the operating condition of bone conduction headphones and making corresponding adjustments is crucial for ensuring their functionality.

[0005] Therefore, there is a need to provide a method that can judge, provide feedback on, and optimize the working status of bone conduction headphones in order to ensure the functionality of bone conduction headphones and enable users to have a better auditory and wearing experience when wearing them. Summary of the Invention

[0006] One embodiment of this application provides a method for optimizing the working state of bone conduction headphones. The bone conduction headphones include an earphone core and at least one vibration sensor. The method includes: acquiring a vibration signal through the at least one vibration sensor, the vibration signal being at least partially derived from the vibration generated by the earphone core in response to an audio signal, the vibration of the earphone core being configured to be transmitted to a user wearing the bone conduction headphones via bone conduction; determining the vibration response characteristics of the earphone core based on the vibration signal and the audio signal; and providing feedback on the working state of the bone conduction headphones based on the vibration response characteristics of the earphone core.

[0007] One embodiment of this application provides a bone conduction headphone, which includes an acquisition module, a determination module, and a control module. The acquisition module acquires vibration signals through at least one vibration sensor. The vibration signals are at least partially derived from the vibration of the headphone core in response to an audio signal. The vibration of the headphone core is configured to be transmitted to the user wearing the bone conduction headphone via bone conduction. The determination module determines the vibration response characteristics of the headphone core based on the vibration signals and the audio signal. The control module provides feedback on the operating state of the bone conduction headphone based on the vibration response characteristics of the headphone core.

[0008] One embodiment of this application provides a method for training a recognition model. The method includes: acquiring sample information; determining the sample type of each of at least two user wearing records based on the sample information, wherein the sample type includes a positive sample type or a negative sample type; determining sample feature information corresponding to each of the at least two user wearing records based on the sample information; and determining the recognition model based on the sample feature information and the sample type of each of the at least two user wearing records. Attached Figure Description

[0009] This application will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0010] Figure 1 This is a flowchart of a method for optimizing the working state of bone conduction headphones according to some embodiments of this application;

[0011] Figure 2 This is a flowchart of a method for providing feedback on the working status of bone conduction headphones according to some embodiments of this application;

[0012] Figure 3 These are frequency response curves of the earphone core vibration when the bone conduction headphones are in the working state of being worn by the user and not worn by the user, according to some embodiments of this application.

[0013] Figure 4 This is a flowchart of a method for providing feedback on the working status of bone conduction headphones according to some embodiments of this application;

[0014] Figure 5 These are frequency response curves of the headphone core vibration when the user is wearing the headphones properly and when the user is not wearing them properly, according to some embodiments of this application.

[0015] Figure 6This is a flowchart of a method for providing feedback on the working status of bone conduction headphones according to some embodiments of this application;

[0016] Figure 7 The present invention provides frequency response curves of the earphone core vibration corresponding to larger and smaller clamping forces when a user wears bone conduction headphones, based on some embodiments of the present application.

[0017] Figure 8 These are frequency response curves of the earphone core vibration when different users wear the same bone conduction earphone, according to some embodiments of this application;

[0018] Figure 9 These are frequency response curves of the earphone core vibration when the same user wears bone conduction earphones multiple times, according to some embodiments of this application.

[0019] Figure 10 This is a flowchart of a method for providing feedback on the working status of bone conduction headphones according to some embodiments of this application;

[0020] Figure 11 This is a flowchart of a method for providing feedback on the working status of bone conduction headphones according to some embodiments of this application;

[0021] Figure 12 This is a flowchart of a method for providing feedback on the working status of bone conduction headphones according to some embodiments of this application;

[0022] Figure 13 This is a flowchart of a training method for a recognition model provided according to some embodiments of this application;

[0023] Figure 14 This is a block diagram of a bone conduction headphone provided according to some embodiments of this application. Detailed Implementation

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0025] It should be understood that the terms “system,” “device,” “unit,” and / or “module” used herein are one way to distinguish different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0026] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0027] Flowcharts are used in this application to illustrate the operations performed by the system according to embodiments of this application. It should be understood that the preceding or following operations are not necessarily performed precisely in sequence. Instead, the steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more steps can be removed from them.

[0028] When using bone conduction headphones, different operating states can affect their functionality, leading to a poorer auditory and wearing experience for the user. For example, if the headphones are not worn properly, the sound quality will be poor. Similarly, if the initial input voltage of the bone conduction headphones is too low or too high, the volume will be too low or too high, resulting in a poor auditory experience or even hearing damage. Furthermore, too little or too much clamping force will affect the transmission efficiency of bone conduction and the user's auditory and wearing experience. Finally, the fact that bone conduction headphones do not automatically enter or exit working mode when worn increases power consumption and negatively impacts the user experience.

[0029] To address the aforementioned issues, this specification describes a method for optimizing the operating state of bone conduction headphones. By providing feedback on the operating state of the bone conduction headphones, the method optimizes their operation, thereby ensuring a better auditory and wearing experience for the user. In some embodiments, the bone conduction headphones may include an earphone core and at least one vibration sensor. The earphone core can vibrate in response to an audio signal, and this vibration can be transmitted to the user wearing the headphones via bone conduction. Since the skin load varies at different locations on the human body, the vibration of the earphone core is related to the user's actual wearing position. Here, at least one vibration sensor can acquire the vibration signal after the earphone core is coupled with the human skin. Further, the vibration response characteristics of the earphone core can be determined based on the audio signal and the vibration signal. Based on the vibration response characteristics of the earphone core, the operating state of the bone conduction headphones can be fed back to optimize their operation. In some embodiments, providing feedback on the operating state of the bone conduction headphones may include: when the user is not wearing the bone conduction headphones, generating a command to pause playback or adaptively adjusting the power consumption of the bone conduction headphones to reduce power consumption. In some embodiments, providing feedback on the working status of bone conduction headphones may include: generating a prompt message to remind the user to wear the headphones again when they are not properly worn, so that the user hears better sound quality through the headphones and obtains a better listening experience. In some embodiments, providing feedback on the working status of bone conduction headphones may include: adaptively adjusting the amplitude of the audio signal input to the headphone core when the input voltage of the headphone core is too low or too high, thereby ensuring that the user can hear a suitable volume. In some embodiments, providing feedback on the working status of bone conduction headphones may include: adaptively adjusting the clamping force when the user wears the headphones when the clamping force is too low or too high, ensuring both the transmission efficiency of bone conduction and the user's wearing comfort. In some embodiments, providing feedback on the working status of bone conduction headphones may further include: performing EQ compensation on the audio signal input to the headphone core when different users wear the headphones or when the same user wears the headphones repeatedly, to ensure that different users or users using different wearing methods hear the same sound effect through the bone conduction headphones. In some embodiments, by providing feedback on the working status of the bone conduction headphones, it is also possible to monitor the user's physiological state in order to supervise and provide feedback on the user's health.

[0030] Figure 1 This is a flowchart of a method for optimizing the working state of bone conduction headphones according to some embodiments of this application.

[0031] In some embodiments, bone conduction headphones may include an earphone core and at least one vibration sensor. In bone conduction headphones, the earphone core can be a transducer that converts received audio signals into mechanical vibrations, which are transmitted to the ear via bone conduction, allowing the listener to hear the corresponding sound. In some embodiments, the earphone core may include, but is not limited to, electrodynamic (coil-type), moving iron, piezoelectric, pneumatic, and electrode-type earphone cores, capable of vibrating in response to audio signals. For example, the earphone core can be an electrodynamic earphone core, whose structure may include an electromagnet, a coil, and a diaphragm. The coil is connected to the diaphragm, and the coil can drive the diaphragm to vibrate under the influence of a signal current.

[0032] A vibration sensor can be a sensor that acquires the frequency response curve of the headphone core's vibration based on the vibration of the headphone core. In some embodiments, at least one vibration sensor can be disposed inside or on the surface of the headphone core. The vibration sensor can acquire vibration signals based on the vibration of the headphone core, and then acquire the frequency response curve of the headphone core's vibration based on the audio signal and the vibration signal. The vibration response characteristics of the headphone core can be determined through this frequency response curve. In some embodiments, the vibration response characteristics of the headphone core may include one or more of the following: the resonant frequency of the headphone core, the peak response at a specific frequency, the quality factor, and the input voltage. In some embodiments, based on the parameters measured by the vibration sensor, the vibration sensor may include displacement sensors, velocity sensors, acceleration sensors, etc., or combinations thereof. Different types of sensors can be applied to the acquisition of vibrations in different frequency bands of the headphone core. For example, when the vibration sensor is a displacement sensor, it can be used to acquire low-frequency vibrations of the headphone core. As another example, when the vibration sensor is a velocity sensor, it can be used to acquire mid-frequency vibrations of the headphone core. Yet another example, when the vibration sensor is an acceleration sensor, it can be used to acquire mid-to-high frequency vibrations of the headphone core. In some embodiments, the bone conduction headphones may further include at least one vibration sensor for acquiring vibration signals at various frequency bands (e.g., low frequency, mid frequency, high frequency, etc.) to monitor vibration signals across the entire frequency range. In some embodiments, vibration sensors are classified according to the presence or absence of external excitation; vibration sensors may include active sensors (requiring external voltage or current excitation) and passive sensors. In some embodiments, vibration sensors are classified according to the direction of vibration measured; vibration sensors may include, but are not limited to, single-axis sensors, multi-axis sensors, and rotational angular velocity sensors. Different types of sensors measure different vibration directions; for example, single-axis sensors can achieve single-axis vibration direction measurement. Multi-axis sensors and rotational angular velocity sensors can achieve multi-axis vibration direction measurement. In some embodiments, the type of vibration sensor may include, but is not limited to, piezoelectric sensors, integrated circuit piezoelectric (ICP) accelerometers, and microelectromechanical systems (MEMS) sensors.

[0033] like Figure 1 As shown, the method 100 for optimizing the working state of bone conduction headphones may include the following steps:

[0034] Step 110: Acquire vibration signals using at least one vibration sensor.

[0035] In some embodiments, step 110 may be performed by the acquisition module of the bone conduction headphones (e.g., acquisition module 1410). In some embodiments, the vibration signal originates at least in part from the vibration generated by the headphone core in response to an audio signal. Specifically, the headphone core can convert the received audio signal into mechanical vibration, which is transmitted to the user wearing the bone conduction headphones via bone conduction, allowing the user to hear the corresponding sound. This mechanical vibration can be transmitted to a vibration sensor inside or on the surface of the headphone core, which can acquire the corresponding vibration signal based on the mechanical vibration. Based on the audio signal and the vibration signal, a frequency response curve of the headphone core vibration can be acquired, and the vibration response characteristics of the headphone core can be determined through this frequency response curve. In some embodiments, the audio signal may include light signals, electrical signals, magnetic signals, mechanical signals, etc., that have sound information. In some embodiments, the headphone core can receive the audio signal via a wired or wireless connection. The audio signal may come from the storage unit of the bone conduction headphones themselves or from a terminal device other than the bone conduction headphones (e.g., a mobile phone, computer, MP3 player, etc.). In some embodiments, the audio signal may be a pre-set audio calibration signal. For example, the audio calibration signal may be a sweep frequency signal, a white noise signal, or a sound signal corresponding to a piece of music. In some embodiments, the audio signal may be a sound signal played when the user wears bone conduction headphones.

[0036] Step 120: Determine the vibration response characteristics of the earphone core based on the vibration signal and audio signal.

[0037] In some embodiments, step 120 may be performed by a determination module of the bone conduction headphones (e.g., determination module 1420). In some embodiments, after acquiring a vibration signal based on the vibration of the headphone core (also known as mechanical vibration), the vibration sensor may acquire a frequency response curve of the headphone core vibration based on the vibration signal and an audio signal, and the vibration response characteristics of the headphone core can be determined based on the frequency response curve. In some embodiments, the vibration response characteristics of the headphone core can be extracted from the frequency response curve of the headphone core vibration using feature extraction methods. In some embodiments, the methods for extracting vibration response characteristics may include, but are not limited to, Principal Components Analysis (PCA), Independent Component Algorithm (ICA), Linear Discriminant Analysis (LDA), Singular Value Decomposition (SVD), etc. In some embodiments, the vibration response characteristics of the headphone core may include at least one of the headphone core's resonant frequency, peak response at a specific frequency, quality factor, and input voltage. Furthermore, the resonant frequency of the earphone core, the peak response at a specific frequency, the quality factor, or parameter values ​​(e.g., vibration amplitude, velocity, acceleration, etc.) used to characterize the input voltage of the earphone core, or any combination thereof, can be determined from the frequency response curve of the earphone core vibration.

[0038] Step 130: Based on the vibration response characteristics of the earphone core, feedback is provided on the working status of the bone conduction earphone.

[0039] In some embodiments, step 130 can be performed by the control module of the bone conduction headphones (e.g., control module 1430). In some embodiments, different operating states of the bone conduction headphones can affect the vibration of the headphone core, resulting in different vibration response characteristics of the headphone core. Therefore, the operating state of the bone conduction headphones can be determined by the vibration response characteristics of the headphone core, thereby providing feedback on the operating state of the bone conduction headphones to optimize the operating state and ensure the user's auditory and wearing experience when wearing the bone conduction headphones. In some embodiments, the feedback on the operating state of the bone conduction headphones based on the vibration response characteristics of the headphone core can be implemented by an algorithm. It should be noted that in some embodiments, the determination of different operating states of the bone conduction headphones can be based on a certain time interval (e.g., 1s, 2s, 3s, etc.). In some embodiments, the determination of the operating state of the bone conduction headphones can be made within a certain time range (e.g., 3s, 4s, 5s, etc.) when the bone conduction headphones are powered on.

[0040] In some embodiments, the operating state of bone conduction headphones may include a user-worn state and a user-unworn state. Feedback on the operating state of bone conduction headphones based on the vibration response characteristics of the headphone core may include determining whether the operating state of the bone conduction headphones is a user-unworn state. If the operating state is a user-unworn state, a command may be generated to pause the operation of the bone conduction headphones (e.g., play music) or adjust the power consumption of the bone conduction headphones to reduce power consumption. If the operating state is a user-worn state, the bone conduction headphones continue to maintain this operating state or further determine other operating states of the bone conduction headphones (e.g., a good fit / bad fit, excessive or insufficient clamping force, etc.). For more detailed descriptions of the user-worn and user-unworn states of bone conduction headphones and feedback on the operating state of bone conduction headphones, please refer to [link to relevant documentation]. Figure 2 And its related descriptions.

[0041] In some embodiments, the operating state of bone conduction headphones may include a good wearing state and a bad wearing state. Feedback on the operating state of bone conduction headphones based on the vibration response characteristics of the headphone core may include determining whether the operating state is a bad wearing state. If the operating state is a bad wearing state, the bone conduction headphones may generate a prompt message to remind the user to put the headphones back on or adjust the wearing posture and position, thereby ensuring the user's auditory and wearing experience. If the operating state is a good wearing state, the bone conduction headphones continue to maintain this good wearing state. For more details on the operating states of bone conduction headphones, including good wearing and bad wearing states, and feedback on the operating state of bone conduction headphones, please refer to [link to relevant documentation]. Figure 4 And its related descriptions.

[0042] In some embodiments, the operating state of bone conduction headphones can be related to the clamping force when a user wears them. Feedback on the operating state of the bone conduction headphones based on the vibration response characteristics of the headphone core can include determining whether the clamping force is within a preset range. If the clamping force is not within the preset range, a command can be generated to adjust the corresponding structure of the bone conduction headphones to change the clamping force, ensuring it falls within the preset range. This avoids poor sound quality due to insufficient clamping force or discomfort due to excessive clamping force, thus guaranteeing the user's auditory and wearing experience. For more details on the relationship between the operating state of bone conduction headphones and the clamping force when a user wears them, please refer to [link to relevant documentation]. Figure 6 And its related descriptions.

[0043] In some embodiments, the operating state of bone conduction headphones may include the input voltage of the headphone core. Based on the vibration response characteristics of the headphone core, feedback on the operating state of the bone conduction headphones may include acquiring a parameter value characterizing the input voltage of the headphone core, determining whether the parameter value is within a voltage threshold, and if the input voltage of the headphone core is not within the voltage threshold, adjusting the amplitude of the audio signal input to the headphone core. This ensures that the amplitude of the audio signal is not too small, resulting in poor sound quality or low volume for the user through the bone conduction headphones, and that the amplitude is not too large, which could damage the headphone core, cause discomfort to the user, or even damage their hearing, thereby guaranteeing the user's auditory and wearing experience. For more details regarding the input voltage as part of the operating state of bone conduction headphones, and for further description of feedback on the operating state of bone conduction headphones, please refer to [link to relevant documentation]. Figure 11 And its related descriptions.

[0044] In some embodiments, providing feedback on the operating state of bone conduction headphones based on the vibration response characteristics of the headphone core may include identifying the difference between the vibration response characteristics of the headphone core and the target response characteristics, and adjusting the audio signal input to the headphone core according to the difference. For further description, see [link to relevant documentation]. Figure 10 And its related descriptions.

[0045] In some embodiments, providing feedback on the working state of bone conduction headphones based on the vibration response characteristics of the earphone core may include obtaining parameter values ​​related to the user's physiological parameters based on the vibration response characteristics of the earphone core, and turning the auxiliary module of the bone conduction headphones on or off based on the parameter values. For more details, please refer to [link to relevant documentation]. Figure 12 And its related descriptions.

[0046] In some embodiments, the working state of bone conduction headphones can include a user-worn state and a user-unworn state. The user-worn state refers to the working state of the bone conduction headphones after they are worn by a user; this can also be understood as the earpiece of the bone conduction headphones being in contact with the user's scalp. The user-unworn state refers to the state in which the bone conduction headphones are not worn by a user; this can be understood as the bone conduction headphones not being in contact with the user's scalp.

[0047] Figure 2 This is a flowchart illustrating a method for providing feedback on the operating state of bone conduction headphones according to some embodiments of this application. When determining whether the operating state of the bone conduction headphones is that they are being worn or not, the method 200 for providing feedback on the operating state of the bone conduction headphones based on the vibration response characteristics of the headphone core may include the following steps:

[0048] Step 210: Based on the vibration response characteristics of the earphone core, determine whether the working state is that the user is not wearing the earphone.

[0049] In some embodiments, step 210 can be performed by the determination module of the bone conduction headphones (e.g., determination module 1420). In some embodiments, when the bone conduction headphones are in the user-wearing state, the headphone core is in contact with the user's skin, and the mechanical impedance of the skin affects the vibration of the headphone core. However, when the bone conduction headphones are in the user-unwearing state, the headphone core is not in contact with the user's skin, and the vibration of the headphone core is not affected by the mechanical impedance of the skin. Therefore, the vibration signals of the headphone core collected by the vibration sensor are different when the bone conduction headphones are in the user-wearing state and when the user is not wearing them. This results in different vibration response characteristics (e.g., resonant frequency, peak response at a specific frequency, quality factor, etc.) for the headphone core when the bone conduction headphones are in the user-wearing state and when the user is not wearing them. Based on the vibration response characteristics of the headphone core, it is possible to determine whether the bone conduction headphones are in the user-wearing state or the user-unwearing state. To further explain the bone conduction headphones in the user-wearing state and the user-unwearing state, the following will be combined with Figure 3 Describe it. Figure 3 These are frequency response curves of the earphone core vibration when the bone conduction headphones are in the user-worn and user-unworn states, according to some embodiments of this application. Figure 3 The solid line in the figure represents the frequency response curve of the headphone core vibration when the bone conduction headphones are in working condition and being worn by the user. Figure 3 The dashed line in the figure represents the frequency response curve of the headphone core vibration when the bone conduction headphones are not worn by the user. Figure 3As shown, the frequency response curves of the earphone core vibration in bone conduction headphones differ significantly between the user-worn and non-worn states. The vibration response characteristics of the earphone core also differ between these states. For example, the frequency response curve of the earphone core vibration when the user is wearing the headphones is flatter than that when the user is not wearing them. Furthermore, the frequency corresponding to the peak response of the earphone core vibration frequency response curve when the user is wearing the headphones is lower than that when the user is not wearing them. Specifically, when the user is not wearing the headphones, the frequency response curve of the earphone core has a peak response of 310 at approximately 26Hz and a peak response of 320 at approximately 100Hz. The peak response of 310 is approximately -65dB, and the peak response of 320 is approximately -35dB. When bone conduction headphones are in use and worn by the user, the frequency response curve of the headphone core has a peak response of 330 at around 56Hz and a peak response of 340 at around 120Hz. The peak response of 330 is approximately -62dB, and the peak response of 340 is approximately -60dB.

[0050] Step 220: If the working state is that the user is not wearing the headphones, then generate a command to adjust the power consumption of the bone conduction headphones.

[0051] In some embodiments, step 220 can be performed by the control module of the bone conduction headphones (e.g., control module 1430). In some embodiments, the bone conduction headphones may include a feedback circuit, and the control module (e.g., control module 1430) can generate a corresponding instruction in response to the operating state being a user-unworn state to control the feedback circuit to adjust the power consumption of the bone conduction headphones. In some embodiments, adjusting the power consumption of the bone conduction headphones can be achieved by pausing playback of the bone conduction headphones. For example, the instruction generated by the control module can control the feedback circuit to pause the reception of audio signals from the headphone core of the bone conduction headphones or stop the terminal device from transmitting audio signals to the headphone core of the bone conduction headphones, or turn off the power or some power-consuming functions of the bone conduction headphones. By providing feedback on the operating state of the bone conduction headphones being a user-unworn state and generating instructions to adjust the power consumption of the bone conduction headphones, the power consumption of the bone conduction headphones can be reduced, and the battery life of the bone conduction headphones can be increased.

[0052] In some embodiments, a recognition model can also be used to determine whether the bone conduction headphones are in a state where the user is not wearing them. Specifically, the vibration response characteristics of the headphone core can be input into the recognition model, and then a judgment result can be generated based on the output of the recognition model. The judgment result can include whether the bone conduction headphones are in a state where the user is wearing them or a state where the user is not wearing them. In some embodiments, the recognition model can be a trained machine learning model. In some embodiments, the machine learning model can include a K-Nearest Neighbor (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 a combination thereof.

[0053] In some embodiments, the above-mentioned recognition model can be obtained by training as follows: using the pre-determined working state of the bone conduction headphones as the user wearing state and the corresponding vibration response features of the headphone core as training positive samples; using the pre-determined working state of the bone conduction headphones as the user not wearing state and the corresponding vibration response features of the headphone core as training negative samples; and using a machine learning model to train the training positive samples and training negative samples respectively to obtain a recognition model that can determine whether the working state of the headphones is the user not wearing state.

[0054] In some embodiments, the vibration response features of the earphone core can be extracted by an algorithm (e.g., the method for extracting vibration response features in step 120) and compared with preset vibration response features to determine whether the working state of the bone conduction headphones is the user-unworn state. The preset vibration response features can be the vibration response features of the bone conduction headphones when the user is wearing them (e.g., resonant frequency, response peak at a specific frequency, quality factor, etc.). If the vibration response features of the earphone core differ from the user's or the difference is not within a certain threshold, the corresponding working state can be determined to be the user-unworn state.

[0055] In some embodiments, if the working state is the user wearing state, the bone conduction headphones work normally. Alternatively, it can be further determined whether the working state of the bone conduction headphones is the user not wearing them properly, so as to provide feedback on the working state of the user not wearing them properly and optimize it.

[0056] In some embodiments, the operating states of bone conduction headphones may further include a properly worn state and a improperly worn state. A properly worn state refers to the operating state in which the bone conduction headphones are correctly worn by the user. For example, the vibration output end of the headphone's earpiece is completely in contact with the user's skin. Another example is that the earpiece is located within a specific area of ​​the user's skin (e.g., the earpiece is located in the area in front of the user's auricle). An improperly worn state refers to the operating state in which the bone conduction headphones are not correctly worn by the user. For example, only part of the earpiece is in contact with the user's scalp. Another example is that the earpiece is located outside a specific area of ​​the user's skin (e.g., behind the user's auricle). Figure 4 This is a flowchart illustrating a method for providing feedback on the operating state of bone conduction headphones according to some embodiments of this application. When determining whether the operating state of the bone conduction headphones is one where the user is wearing them well or not, the method 400 for providing feedback on the operating state of the bone conduction headphones based on the vibration response characteristics of the headphone core may include the following steps:

[0057] Step 410: Based on the vibration response characteristics of the earphone core, determine whether the working state is a good state where the user is not wearing the earphone. In some embodiments, step 410 may be performed by the determination module of the bone conduction earphone (e.g., determination module 1420).

[0058] In some embodiments, when the bone conduction headphones are in a good-fitting state and a bad-fitting state, the contact conditions between the headphone core and the user's scalp are different, resulting in different effects of the skin's mechanical impedance on the headphone core's vibration. Therefore, the vibration signals of the headphone core collected by the vibration sensor are different when the bone conduction headphones are in a good-fitting state and a bad-fitting state, leading to different vibration response characteristics (e.g., resonant frequency, peak response at a specific frequency, quality factor, etc.) for the headphone core. Based on the vibration response characteristics of the headphone core, it is possible to determine whether the bone conduction headphones are in a good-fitting state or a bad-fitting state. To further illustrate the bone conduction headphones in the good-fitting and bad-fitting states, the following will be combined with... Figure 5 Describe it. Figure 5 These are frequency response curves of the headphone core vibration when the bone conduction headphones, according to some embodiments of this application, are in a good user wearing state and a good user not wearing state. Figure 5 The solid line in the figure represents the frequency response curve of the headphone core vibration when the bone conduction headphones are in working condition and the user is wearing them properly. Figure 5 The dashed line in the figure represents the frequency response curve of the headphone core vibration when the bone conduction headphones are not properly worn by the user. Figure 5 As shown, the frequency response curves of the headphone core vibration in bone conduction headphones differ significantly between the two operating states: when the user is wearing the headphones comfortably and when the user is not wearing them comfortably. The vibration response characteristics of the headphone core also differ between these two states. For example, the frequency response curve of the headphone core vibration when the user is wearing the headphones comfortably is flatter than that when the user is not wearing them comfortably. Furthermore, the frequency corresponding to the peak response of the headphone core vibration frequency response curve when the user is wearing the headphones comfortably is lower than that when the user is not wearing them comfortably. Specifically, when the user is not wearing the headphones comfortably, the headphone core frequency response curve has a peak response of 510 at approximately 50Hz and a peak response of 520 at approximately 80Hz. Peak response 510 is approximately -84dB, and peak response 520 is approximately -63dB. When bone conduction headphones are properly worn by the user, the frequency response curve of the earphone core has a corresponding peak value of 530 at around 60Hz and a peak value of 540 at around 160Hz. The peak value of 530 is approximately -65dB, and the peak value of 540 is approximately -45dB. Furthermore, when the user does not wear the bone conduction headphones properly, for example, when only part of the earphone core is in contact with the skin, a trough of 550 will appear in the frequency response curve. In some embodiments, the presence of one or more troughs (e.g., trough 550) in the frequency response curve of the bone conduction headphones can also indicate that the user is not wearing the headphones properly.

[0059] Step 420: If the working status is that the user is not wearing the headphones properly, the bone conduction headphones will issue a prompt message.

[0060] In some embodiments, step 420 may be performed by the control module of the bone conduction headphones (e.g., control module 1430). In some embodiments, the control module may issue a prompt message that can be received by the user, prompting the user to put on the bone conduction headphones again or adjust the posture or position of wearing the headphones. In some embodiments, the bone conduction headphones may prompt the user through vibration of the headphone core or by playing voice prompts through the headphone core. In some embodiments, the bone conduction headphones may issue prompt messages to the user through a terminal device (e.g., a mobile phone, computer, etc.) connected to them via wires or wirelessly. The form of the prompt message may include, but is not limited to, vibration, text, images, and voice. By providing feedback on the working state of the bone conduction headphones, indicating that the user is not wearing them properly, the bone conduction headphones can issue prompt messages to the user, prompting the user to put on the bone conduction headphones again or adjust the posture or position of wearing the headphones, so as to avoid poor sound quality due to incorrect wearing of the bone conduction headphones and ensure the user's auditory experience. In some embodiments, if the working state of the bone conduction headphones is that the user is wearing them properly, the bone conduction headphones continue to operate in this properly worn working state.

[0061] In some embodiments, the recognition model can also determine whether the working state of the bone conduction headphones is a state where the user is not wearing them properly. Specifically, the vibration response characteristics of the headphone core can be input into the recognition model, and then a judgment result can be generated based on the output of the recognition model. The judgment result can include whether the working state of the bone conduction headphones is a state where the user is wearing them properly or a state where the user is not wearing them properly. In some embodiments, the recognition model can be a trained machine learning model. In some embodiments, the machine learning model can include a K-Nearest Neighbor (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 a combination thereof.

[0062] In some embodiments, the above-mentioned recognition model can be obtained by training as follows: using the pre-determined working state of the bone conduction headphones as the user wearing the headphones well and the corresponding vibration response features of the headphone core as training positive samples; using the pre-determined working state of the bone conduction headphones as the user not wearing the headphones well and the corresponding vibration response features of the headphone core as training negative samples; and using a machine learning model to train the training positive samples and training negative samples respectively, so as to obtain a recognition model that can determine whether the working state of the headphones is the user not wearing the headphones well.

[0063] In some embodiments, an algorithm can be used to compare the vibration response characteristics of the earphone core with preset vibration response characteristics to determine whether the working state of the bone conduction headphones is that the user is not wearing them. The preset vibration response characteristics can be the vibration response characteristics of the bone conduction headphones when the user is wearing them well (e.g., resonant frequency, response peak at a specific frequency, quality factor, etc.). If there is a difference between the vibration response characteristics of the earphone core and the preset vibration response characteristics, or if the difference is not within a certain threshold, then the corresponding working state can be determined to be that the user is not wearing them well.

[0064] In some embodiments, providing feedback on the operating status of bone conduction headphones may include adjusting the clamping force when a user wears the headphones. Specifically, the operating status of the bone conduction headphones may be related to the clamping force when a user wears them, and the magnitude of the clamping force can affect the sound quality or volume of the sound heard by the user through the bone conduction headphones, as well as the user's comfort when wearing them. The clamping force when a user wears the bone conduction headphones may be the pressure of the headphone core against the user's skin. Figure 6 This is a flowchart illustrating a method for providing feedback on the operating state of bone conduction headphones according to some embodiments of this application. When the operating state of the bone conduction headphones is related to the clamping force of the headphones worn by the user, the method 600 for providing feedback on the operating state of the bone conduction headphones based on the vibration response characteristics of the headphone core may include the following steps:

[0065] Step 610: Based on the vibration response characteristics of the earphone core, determine whether the clamping force when the user wears the bone conduction earphone is within the preset range.

[0066] In some embodiments, step 610 can be performed by the determination module of the bone conduction headphones (e.g., determination module 1420). In some embodiments, because different clamping forces when a user wears bone conduction headphones result in different mechanical impedances of the skin, and different mechanical impedances of the skin have different effects on the vibration of the headphone core, different clamping forces when a user wears bone conduction headphones will lead to different frequency response curves of the headphone core vibration collected by the vibration sensor. This allows different clamping forces when a user wears bone conduction headphones to correspond to different vibration response characteristics of the headphone core (e.g., resonant frequency, response peak at a specific frequency, quality factor, etc.). Based on the vibration response characteristics of the headphone core, it can be determined whether the clamping force when a user wears bone conduction headphones is within a preset range. In some embodiments, the preset range can be 0.2N to 0.5N. In some embodiments, the preset range can be 0.25N to 0.45N. In some embodiments, the preset range can be 0.3N to 0.4N. It should be noted that the preset range is not limited to the above ranges, and the preset range can be adaptively adjusted according to the user's experience.

[0067] To further explain bone conduction headphones with different clamping forces when worn by users, the following will be combined with... Figure 7 Describe it. Figure 7 These are frequency response curves of the earphone core vibration corresponding to larger and smaller clamping forces when a user wears the bone conduction headphones, based on some embodiments of this application. Figure 7 The solid line in the figure represents the frequency response curve of the headphone core vibration corresponding to the smaller clamping force when the user wears bone conduction headphones. Figure 7 The dotted line in the diagram represents the frequency response curve of the headphone core vibration corresponding to a larger clamping force when the user wears bone conduction headphones. For example... Figure 7 As shown, the frequency response curves of the earphone core vibration differ significantly depending on the clamping force when the user wears bone conduction headphones. The vibration response characteristics of the earphone core also differ between these two conditions. For example, the frequency response curve of the earphone core vibration when the user wears bone conduction headphones with a larger clamping force is flatter than that when the user wears them with a smaller clamping force. Furthermore, the frequency corresponding to the peak response of the earphone core vibration when the user wears bone conduction headphones with a smaller clamping force is lower than the frequency corresponding to the peak response of the earphone core vibration when the user wears bone conduction headphones with a larger clamping force. Specifically, the frequency response curve of the earphone core vibration when the user wears bone conduction headphones with a smaller clamping force has a peak response of 710 at approximately 45Hz and a peak response of 720 at approximately 150Hz. The peak response of 710 is approximately -53dB, and the peak response of 720 is approximately -54dB. When a user applies significant clamping force to the bone conduction headphones, the frequency response curve of the headphone core vibration exhibits a peak response of 730 at approximately 50Hz and a peak response of 740 at approximately 200Hz. The peak response of 730 is approximately -52dB, and the peak response of 320 is approximately -60dB. In some embodiments, combined with... Figure 5 The frequency response curve of the headphone core vibration when the user is wearing the bone conduction headphones in a comfortable working state is shown. It can be seen that the frequency response curve of the headphone core vibration when the user is wearing the headphones in a comfortable state is flatter than the frequency response curve of the headphone core vibration when the user is wearing the headphones with a smaller or larger clamping force. Furthermore, the frequency corresponding to the peak frequency of the headphone core vibration in the comfortable state is higher than the frequency corresponding to the peak frequency of the headphone core vibration in the frequency response curve when the user is wearing the headphones with a smaller or larger clamping force. Further, the frequency response curve of the headphone core vibration when the user is wearing the headphones with a smaller or larger clamping force both have a large trough (e.g., trough 75°, trough 76°), which can also reflect whether the user is wearing the headphones with a smaller or larger clamping force.

[0068] Step 620: If the clamping force generated when the user wears the bone conduction headphones is adjusted to change the clamping force when the user wears the bone conduction headphones, the corresponding structure of the bone conduction headphones will be adjusted.

[0069] In some embodiments, step 620 may be performed by the control module of the bone conduction headphones (e.g., control module 1430). In some embodiments, the bone conduction headphones may include a feedback circuit and a structure for adjusting the clamping force. The control module may generate a corresponding instruction to control the feedback circuit to adjust the structure of the bone conduction headphones for adjusting the clamping force when the user wears the bone conduction headphones, thereby changing the clamping force when the user wears the bone conduction headphones. In some embodiments, the control module may generate a corresponding instruction to control the feedback circuit to accurately adjust the structure of the bone conduction headphones for adjusting the clamping force based on the difference between the clamping force and the preset range, so that the clamping force when the user wears the bone conduction headphones is exactly within the preset range. In some embodiments, the clamping force when the user wears the bone conduction headphones may be adjusted by controlling the feedback circuit to adjust the length or angle of the backrest of the bone conduction headphones through the instruction generated by the control module. For example, when the clamping force is less than the preset range, the clamping force may be increased by increasing the backrest length or decreasing the backrest angle; or, when the clamping force is greater than the preset range, the clamping force may be decreased by decreasing the backrest length or increasing the backrest angle. In some embodiments, bone conduction headphones may include a drive structure capable of changing the length and angle of the headphones based on instructions generated by a feedback circuit. For example, the drive structure may include a micro motor and an adjustment component (e.g., a retractable rod structure) for adjusting the length or angle of the headband, the output of the micro motor being connected to the adjustment structure, and the micro motor driving the adjustment component to increase or decrease the length and angle of the headband.

[0070] In some embodiments, a recognition model can be used to determine whether the clamping force when a user wears bone conduction headphones is within a preset range. Specifically, the vibration response characteristics of the headphone core can be input into the recognition model, and then a parameter value representing the clamping force when a user wears bone conduction headphones can be obtained based on the output of the recognition model, and it can be determined whether the parameter value is within a preset range. In some embodiments, the parameter value representing the clamping force when a user wears bone conduction headphones can be a parameter that reflects the magnitude of the clamping force or the range of the clamping force. In some embodiments, the recognition model can be a trained machine learning model. In some embodiments, the machine learning model can include a K-Nearest Neighbor (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 a combination thereof.

[0071] In some embodiments, the above-mentioned recognition model can be obtained by training as follows: pre-collecting the vibration response features of the earphone core corresponding to different clamping forces when the user wears bone conduction headphones, using the collected vibration response features of multiple earphone cores as input data, and using the specific size or range of the corresponding clamping force as output data, to train the machine learning model to obtain a recognition model that can obtain parameter values ​​for characterizing the clamping force when the user wears bone conduction headphones based on the vibration response features of the earphone core.

[0072] After obtaining parameter values ​​representing the clamping force when a user wears bone conduction headphones by recognizing the model, it can be determined whether the parameter value is within the preset range by comparing it with a preset range. In some embodiments, the preset range can be the range of clamping forces that ensures the user can comfortably wear the bone conduction headphones. In some embodiments, the clamping force range can be 0.25N to 0.45N. In some embodiments, the preset range can be 0.3N to 0.4N.

[0073] In some embodiments, an algorithm can be used to directly compare the vibration response characteristics of the earphone core with preset vibration response characteristics to determine whether the clamping force when the user wears the bone conduction headphones exceeds a preset range. The preset vibration response characteristics can be the vibration response characteristics of the earphone core corresponding to the clamping force when the user wears the bone conduction headphones within a preset range (e.g., resonant frequency, peak response at a specific frequency, quality factor, etc.). If the vibration response characteristics of the earphone core differ from the preset vibration response characteristics, or if the difference is not within a certain threshold, it can be determined whether the clamping force corresponding to the vibration response characteristics of the earphone core when the user wears the bone conduction headphones is within the preset range.

[0074] By determining whether the clamping force related to the working state of the bone conduction headphones is within the preset range and providing feedback on the corresponding working state (e.g., adjusting the clamping force), it is possible to avoid the clamping force being too small, which would affect the efficiency of bone conduction and result in poor sound quality or low volume for the user through the bone conduction headphones. It is also possible to avoid the clamping force being too large, which would put too much pressure on the user's skin and cause discomfort to the user, thus ensuring the user's auditory and wearing experience.

[0075] In some scenarios, due to differences in age, body size, and skin characteristics among users, their skin's mechanical impedance varies. This inconsistency affects the vibration of the headphone's core differently when different users wear the same bone conduction headphones, resulting in different sounds perceived by different users based on the same audio signal. To further illustrate the impact of different users wearing the same bone conduction headphones, the following section will discuss... Figure 8 Describe it. Figure 8 These are frequency response curves of the earphone core vibration when different users wear the same bone conduction earphone, according to some embodiments of this application. Figure 8 The solid line in the figure represents the frequency response curve of the headphone core vibration when user A wears bone conduction headphones. Figure 8 The dashed line in the figure represents the frequency response curve of the headphone core vibration when user B wears bone conduction headphones. For example... Figure 8As shown, the frequency response curves of the earphone core vibration differ between users A and B when wearing the same bone conduction headphones, resulting in different vibration response characteristics. Specifically, when user A wears the bone conduction headphones, the frequency response curve of the earphone core has a corresponding peak response of 810 at around 40Hz and a peak response of 820 at around 180Hz. Peak response 810 is approximately -48dB, and peak response 820 is approximately -50dB. When user B wears the bone conduction headphones, the frequency response curve of the earphone core has a corresponding peak response of 830 at around 42Hz and a peak response of 840 at around 100Hz. Peak response 830 is approximately -52dB, and peak response 840 is approximately -47dB.

[0076] In other scenarios, because the skin at different locations has different mechanical impedances, and the position of the earphone core against the skin changes when a user repeatedly wears bone conduction headphones, the mechanical impedance of the skin at different locations will also affect the vibration of the earphone core differently. This results in differences in the same audio signal when the same user wears bone conduction headphones repeatedly. To further explain bone conduction headphones when a user wears them repeatedly, the following will combine... Figure 9 Describe it. Figure 9 These are frequency response curves of the earphone core vibration when the same user wears bone conduction headphones multiple times, according to some embodiments of this application. Figure 9 The solid line in the figure represents the frequency response curve of the headphone core vibration when the user wears the bone conduction headphones for the first time. Figure 9 The dashed line in the figure represents the frequency response curve of the headphone core vibration when the user wears the bone conduction headphones for the second time. From Figure 9 It can be seen that the frequency response curves of the headphone core vibration differ between the first and second time a user wears bone conduction headphones, resulting in different vibration response characteristics of the headphone core. For example, the vibration amplitude of the headphone core in the frequency range of 60Hz to 100Hz differs between the first and second time a user wears bone conduction headphones. This difference leads to different sounds heard by the user during the first and second use of bone conduction headphones (e.g., different sound effects).

[0077] To ensure that different users hear the same sound when wearing the same bone conduction headphones or when the same user wears bone conduction headphones repeatedly, the working status of the bone conduction headphones can be fed back based on the vibration response characteristics of the headphone core. Figure 10This is a flowchart illustrating a method for providing feedback on the working state of bone conduction headphones according to some embodiments of this application. When different users wear the same bone conduction headphones or the same user repeatedly wears bone conduction headphones, the method 1000 for providing feedback on the working state of the bone conduction headphones based on the vibration response characteristics of the headphone core may include the following steps:

[0078] Step 1010: Identify the difference between the vibration response characteristics of the earphone core and the target response characteristics.

[0079] In some embodiments, step 1010 may be performed by a determination module of the bone conduction headphones (e.g., determination module 1420). In some embodiments, the target response characteristic may be a pre-set vibration response characteristic of the headphone core of the bone conduction headphones. In some embodiments, the difference between the actual vibration response characteristic of the headphone core and the target response characteristic may be calculated by an algorithm, wherein the difference between the actual vibration response characteristic of the headphone core and the target response characteristic may include, but is not limited to, the difference in resonant frequency, the difference in response peak value at a specific frequency, the difference in quality factor, etc.

[0080] Step 1020: Adjust the EQ of the audio signal input to the headphone core according to the difference.

[0081] In some embodiments, step 1020 can be performed by the control module of the bone conduction headphones (e.g., control module 1430). Here, EQ is an equalizer capable of adjusting the amplification of various frequency components of the electrical signal. EQ adjustment refers to dividing the audio signal into multiple frequency bands and then adjusting these bands (e.g., amplifying or attenuating) to obtain a better sound effect. In some embodiments, the control module can compensate for the difference between the actual vibration response characteristics and the target response characteristics of the headphone core using EQ. The compensation EQ can be applied to the audio signal, adjusting the original audio signal. The headphone core can vibrate in response to the adjusted audio signal, allowing the user to hear a more ideal sound through the bone conduction headphones.

[0082] In some embodiments, providing feedback on the operating status of bone conduction headphones may include adjusting the amplitude of the audio signal input to the headphone core. Specifically, the amplitude of the bone conduction headphones is related to the input voltage of the headphone core. For example, a higher input voltage results in a higher amplitude, and a lower input voltage results in a lower amplitude. The input voltage of the headphone core affects its vibration amplitude. Excessive vibration amplitude can cause discomfort to the user and may even damage the user's hearing and the headphone core itself. Conversely, insufficient vibration amplitude will affect bone conduction efficiency, resulting in a lower volume of sound heard by the user. Figure 11This is a flowchart illustrating a method for providing feedback on the operating state of a bone conduction headphone according to some embodiments of this application. When the operating state of the bone conduction headphone is the input voltage of the headphone core, the method 1100 for providing feedback on the operating state of the bone conduction headphone based on the vibration response characteristics of the headphone core may include the following steps:

[0083] Step 1110: Based on the vibration response characteristics of the earphone core, obtain parameter values ​​characterizing the input voltage of the earphone core. In some embodiments, step 1110 may be performed by a determination module of the bone conduction earphone (e.g., determination module 1420).

[0084] In some embodiments, since different input voltages of the headphone core can affect the vibration amplitude of the headphone core, different input voltages of the headphone core can correspond to different vibration response characteristics of the headphone core. Therefore, a parameter value characterizing the input voltage of the headphone core can be obtained based on the vibration response characteristics of the headphone core, and it can be determined whether the parameter value is within a voltage threshold. In some embodiments, the voltage threshold can be the maximum voltage that prevents the sound emitted by the bone conduction headphones from producing distortion or clipping. For example, in some embodiments, the voltage threshold is the maximum voltage that prevents the sound pressure level of the sound emitted by the bone conduction headphones from exceeding a specific sound pressure level. In some embodiments, the range of the specific sound pressure level can be 60dB-100dB. Preferably, the range of the specific sound pressure level can be 70dB-90dB. More preferably, the range of the specific sound pressure level can be 75dB-95dB. In some embodiments, the parameter value characterizing the input voltage of the headphone core can be the specific input voltage magnitude or range of the headphone core, or it can be the vibration amplitude of the headphone core or the overall output sound pressure of the headphone core. Regarding how to obtain the parameter value characterizing the input voltage of the headphone core based on the vibration response characteristics of the headphone core, the method for obtaining the parameter value characterizing the clamping force when the user wears the bone conduction headphones described above can be referred to, and will not be repeated here. It should be noted that the voltage threshold and specific sound pressure level can be adaptively adjusted according to the actual application and / or user experience, and no further limitations are made here.

[0085] Step 1120: Determine whether the parameter value is within the voltage threshold.

[0086] In some embodiments, step 1120 may be performed by a determining module of the bone conduction headphones (e.g., determining module 1420). In some embodiments, the determining module may compare the parameter value with a voltage threshold to determine whether the parameter value is within the voltage threshold. In some embodiments, the voltage threshold may be the input voltage value or range of the headphone core that ensures comfortable wear for the user. In some embodiments, the voltage threshold may be the input voltage value or range of the headphone core that ensures the headphone core will not be damaged. In some embodiments, the voltage threshold may be the input voltage value or range of the headphone core that protects the user's hearing; for example, when the parameter value is within the voltage threshold, the overall output of the headphone core will not exceed a certain limited sound pressure level (e.g., children's headphones will try to ensure that the overall sound pressure level does not exceed 85dB) to protect the user's hearing.

[0087] Step 1130: If the parameter value is not within the voltage threshold, adjust the amplitude of the audio signal input to the headphone core.

[0088] In some embodiments, step 1130 may be performed by the control module of the bone conduction headphones (e.g., control module 1430). In some embodiments, the bone conduction headphones may include a feedback circuit, and the control module may generate a corresponding instruction to control the feedback circuit to adjust the amplitude of the audio signal input to the headphone core in response to a parameter value not being within a voltage threshold. For example, the feedback circuit may limit the amplitude of the audio signal input to the headphone core to limit the amplitude of the headphone core vibration, control the playback volume of the bone conduction headphones, and prevent excessive vibration amplitude of the headphone core from causing discomfort to the user or even damaging the user's hearing and the headphone core. Alternatively, the feedback circuit may amplify the amplitude of the audio signal input to the headphone core to increase the playback volume of the bone conduction headphones and improve sound quality.

[0089] In some embodiments, providing feedback on the working status of bone conduction headphones can include providing feedback on the user's physiological state and parameters. Specifically, since different vibration response characteristics of the headphone core can correspond to different skin mechanical impedances, and skin mechanical impedance can reflect the physiological state of the human body to a certain extent, by determining the vibration response characteristics of the headphone core when the user wears bone conduction headphones, the corresponding skin mechanical impedance can be determined. Based on the skin mechanical impedance, the user's physiological state can be judged. For example, it can be determined whether the user is elderly or whether the user is overweight or underweight. Figure 12 This is a flowchart illustrating a method for providing feedback on the working state of a bone conduction headphone according to some embodiments of this application. When using a bone conduction headphone to provide feedback on a user's physiological state and parameters, the method 1200 for providing feedback on the working state of the bone conduction headphone based on the vibration response characteristics of the headphone core may include the following steps:

[0090] Step 1210: Based on the vibration response characteristics of the earphone core, obtain parameter values ​​related to the user's physiological parameters.

[0091] In some embodiments, step 1210 may be performed by the determination module of the bone conduction headphones (e.g., determination module 1420). In some embodiments, the user's physiological parameters refer to the mechanical impedance parameters of the skin in contact with the headphone core. The parameter values ​​related to the user's physiological parameters may include the mass, elasticity, damping, etc., of the mechanical impedance of the skin in contact with the headphone core, and these parameter values ​​may reflect the user's weight, age, etc. For how to obtain the parameter values ​​related to the user's physiological parameters based on the vibration response characteristics of the headphone core, please refer to the method described above for obtaining the parameter values ​​characterizing the clamping force when a user wears bone conduction headphones, which will not be repeated here.

[0092] Step 1220: Based on the parameter values, turn the auxiliary module of the bone conduction headphones on or off.

[0093] In some embodiments, step 1220 can be performed by the control module of the bone conduction headphones (e.g., control module 1430). In some embodiments, the control module can determine changes in the user's physiological state based on significant changes in parameter values ​​in a short period of time, and then activate corresponding auxiliary modules based on these changes. The auxiliary modules can alert the user to these changes; for example, the control module can determine whether the user is gaining or losing weight based on changes in the elasticity and damping of skin mechanical impedance and alert the user through the auxiliary modules. In some embodiments, the control module can determine whether the user is elderly or young based on parameter values. If the user is elderly, the auxiliary modules can be activated to perform some user-friendly functions, including but not limited to fall detection, voice reminders, and automatic gain control. For example, the fall detection function of the auxiliary module can predict falls in the elderly and issue voice reminders, or proactively call for help or notify emergency contacts after detecting a fall. Another example is the automatic gain control function of the auxiliary module, which can automatically adjust the vibration amplitude of the headphone core for elderly users to avoid excessive vibration amplitude causing discomfort.

[0094] It should be noted that the method for optimizing the working state of bone conduction headphones provided in this application may include the aforementioned single method for providing feedback on the working state of bone conduction headphones to achieve a single function, or it may include the aforementioned multiple methods for providing feedback on the working state of bone conduction headphones to achieve multiple functions simultaneously. The functions implemented by the method for providing feedback on the working state of bone conduction headphones may include adjusting the power consumption of the bone conduction headphones, prompting the user to re-wear the bone conduction headphones, adjusting the clamping force when the user wears the bone conduction headphones, EQ adjustment of the audio signal, adjustment of the amplitude of the audio signal, and monitoring the user's physiological state, or combinations thereof. The order of feedback on various working states of the bone conduction headphones can be adaptively adjusted according to actual conditions. For example, in some embodiments, it is possible to first detect and provide feedback on whether the bone conduction headphones are being worn, and then detect and provide feedback on one or more of the following: whether the user is wearing them properly, the clamping force, voltage, etc. Another example is that multiple working states of the bone conduction headphones can be determined simultaneously. Furthermore, the detection and feedback on the working state of the bone conduction headphones can be real-time detection, detection at regular intervals (e.g., 3 seconds, 2 minutes, etc.), or detection based on user input commands.

[0095] In some embodiments, the method for optimizing the operating state of bone conduction headphones provided in this application further includes performing some additional functions through a vibration sensor. These additional functions may include, but are not limited to, echo cancellation, picking up the user's voice signal, fall detection, and assisting in spatial audio.

[0096] In some embodiments, a vibration sensor can be used for echo cancellation. Specifically, the vibration sensor can pick up the vibration of the earphone housing, which acts as a microphone, and feed this vibration back to the earphone housing for cancellation, preventing the sound emitted by the earphone housing from being transmitted back to the earphone housing and causing an echo or howling. In this case, the vibration sensor can be positioned close to the earphone housing to directly pick up and cancel vibrations in the vicinity of the earphone housing.

[0097] In some embodiments, a vibration sensor can be used to pick up the user's voice signal. Specifically, since the earphone core fits against the skin and skull, when a user speaks while wearing bone conduction headphones, sound can also be transmitted back through the skull to the earphone core. In this case, by picking up the vibration of the earphone core using a vibration sensor, the user's voice can also be picked up. Picking up the user's voice signal using vibration via a vibration sensor can resist external air conduction noise; compared to traditional air conduction microphones, picking up the speaker's voice signal using vibration is virtually free from external noise interference.

[0098] In some embodiments, vibration sensors can be used for fall detection. In some embodiments, the vibration sensor can be a multi-axis sensor, such as a uniaxial or triaxial vibration sensor. In some embodiments, the vibration sensor can also be a rotational angular velocity vibration sensor. In some embodiments, the vibration sensor can detect drastic changes in acceleration that occur when a user falls or shows a tendency to fall, thereby predicting a possible fall, especially for the elderly. Furthermore, the bone conduction headphones can issue corresponding warnings or notify emergency contacts based on fall detection by the vibration sensor.

[0099] In some embodiments, vibration sensors can also be used to assist in the realization of spatial audio. Specifically, the realization of spatial audio first requires the use of a gyroscope to determine the direction of the user's head rotation, and the vibration sensor may include a gyroscope. In some embodiments, the vibration sensor may be a multi-axis translational type or a rotational type.

[0100] It should be noted that the above-mentioned additional functions can be performed by a single vibration sensor or by multiple vibration sensors respectively. In some embodiments, the vibration sensor can also work in conjunction with other sensors; for example, the vibration sensor can be combined with a physiological sensor to jointly detect the user's physiological state when the user wears bone conduction headphones.

[0101] This manual also provides a method for training the recognition model. Figure 13 This is a flowchart illustrating a training method for a recognition model based on some embodiments of this application. For example... Figure 13 As shown, the training method 1300 for the recognition model may include the following steps:

[0102] Step 1310: Obtain sample information.

[0103] In some embodiments, the sample information may include wearing records of at least two users. The user wearing records may include the working status of the bone conduction headphones and the corresponding frequency response curve of the headphone core vibration, the clamping force when the user wears the bone conduction headphones and the corresponding frequency response curve of the headphone core vibration, the input voltage of the headphone core and the corresponding frequency response curve of the headphone core vibration, etc.

[0104] Step 1320: Determine the sample type of each of at least two user wearing records based on the sample information, wherein the sample type may include a positive sample type or a negative sample type.

[0105] In some embodiments, the operating state of the bone conduction headphones, where the user is wearing them, can be defined as a positive sample type, while the operating state, where the user is not wearing them, can be defined as a negative sample type. In some embodiments, the operating state of the bone conduction headphones, where the user is wearing them well, can be defined as a positive sample type, while the operating state, where the user is not wearing them well, can be defined as a negative sample type.

[0106] Step 1330: Determine the corresponding sample feature information for each of at least two user wearing records based on the sample information.

[0107] In some embodiments, the sample feature information may include the vibration response characteristics of the earphone core and the operating state of the bone conduction headphones. In some embodiments, the vibration response characteristics of the earphone core may include, but are not limited to, one or more of the earphone core's resonant frequency, peak response at a specific frequency, quality factor, and input voltage. In some embodiments, the operating state of the bone conduction headphones may include the user wearing state / user not wearing state, user well-wearing state / user not well-wearing state, clamping force when the user wears the bone conduction headphones, and the input voltage of the earphone core. In some embodiments, the vibration response characteristics may be directly extracted from the sample information corresponding to the user wearing record. In some embodiments, the operating state of the bone conduction headphones may be determined based on the vibration response characteristics. For detailed information on determining the operating state of bone conduction headphones based on vibration response characteristics, please refer to this application specification. Figures 1 to 11 And its related descriptions.

[0108] Step 1340: Determine the recognition model based on sample feature information and the sample type of each of at least two user wearing records.

[0109] In some embodiments, sample feature information can be used as input, and each sample type from at least two user wearing records can be used as output to train an initial machine learning model to determine a recognition model. In some embodiments, the recognition 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.

[0110] This specification also provides a bone conduction headphone in its embodiments. Figure 14 This is a block diagram of a bone conduction headphone 1000 according to some embodiments of this application. The bone conduction headphone 1000 may include an acquisition module 1410, a determination module 1420, and a control module 1430.

[0111] In some embodiments, the acquisition module 1410 can be used to acquire audio signals and vibration signals. Further, the acquisition module 1410 may include an earphone core and at least one vibration sensor. The acquisition module 1410 can acquire audio signals from the internal storage unit of the bone conduction headphones or from a terminal device (e.g., a mobile phone, computer, MP3 player, etc.) connected to the bone conduction headphones via wired or wireless means. The earphone core can vibrate in response to the audio signals, and the acquisition module 1410 can acquire vibration signals based on the vibration of the earphone core using at least one vibration sensor.

[0112] In some embodiments, the determining module 1420 can determine the vibration response characteristics of the headphone core based on audio signals and vibration signals. In some embodiments, the vibration response characteristics of the headphone core may include at least one of the headphone core's resonant frequency, peak response at a specific frequency, quality factor, and input voltage. In some embodiments, when the operating state of the bone conduction headphones includes a user-worn state and a user-unworn state, the determining module 1420 can determine whether the operating state of the bone conduction headphones is the user-unworn state based on the vibration response characteristics of the headphone core. In some embodiments, when the operating state of the bone conduction headphones includes a user-worn good state and a user-unworn good state, the determining module 1420 can determine whether the operating state of the bone conduction headphones is the user-unworn good state based on the vibration response characteristics of the headphone core. In some embodiments, when the operating state of the bone conduction headphones is related to the clamping force when the user wears the bone conduction headphones, the determining module 1420 can be used to determine whether the clamping force when the user wears the bone conduction headphones is within a preset range. In some embodiments, the determining module 1420 can be used to identify the difference between the vibration response characteristics of the headphone core and the target response characteristics. In some embodiments, when the operating state of the bone conduction headphones includes an input voltage, the determining module 1420 can be used to obtain parameter values ​​characterizing the input voltage of the headphone core based on the vibration response characteristics of the headphone core, and determine whether the parameter values ​​are within a voltage threshold. In some embodiments, the determining module 1420 can be used to obtain parameter values ​​related to the user's physiological parameters based on the vibration response characteristics of the headphone core.

[0113] In some embodiments, the control module 1430 can be used to provide feedback on the operating state of the bone conduction headphones based on the vibration response characteristics of the headphone core. In some embodiments, when the bone conduction headphones are in an unworn state, the control module 1430 can generate instructions to adjust the power consumption of the bone conduction headphones. In some embodiments, when the bone conduction headphones are in a good unworn state, the control module 1430 can control the bone conduction headphones to issue a prompt message. In some embodiments, when the clamping force of the user wearing the bone conduction headphones is not within a preset range, the control module 1430 can generate instructions to adjust the corresponding structure of the bone conduction headphones to change the clamping force when the user wears the bone conduction headphones. In some embodiments, the control module 1430 can be used to perform EQ adjustment on the audio signal input to the headphone core based on the difference between the vibration response characteristics of the headphone core and the target vibration response characteristics. In some embodiments, when the parameter value characterizing the input voltage of the headphone core is not within a voltage threshold, the control module 1430 can adjust the amplitude of the audio signal input to the headphone core. In some embodiments, the control module 1430 can be used to turn the auxiliary module of the bone conduction headphones on or off.

[0114] It should be noted that the above description of the modules included in the bone conduction headphones is only for illustrating modules related to optimizing the working state of the bone conduction headphones. In some embodiments, the bone conduction headphones 1400 may also include other modules, such as a training module for training a recognition model, a signal processing module for processing audio or vibration signals, and a power supply module for supplying power to the bone conduction headphones. Other modules of the bone conduction headphones will not be described in detail here.

[0115] It should be noted that the above description of the modules included in the bone conduction headphones is for ease of description only and should not limit this application to the scope of the embodiments described. It is understood that those skilled in the art, after understanding the principle of bone conduction headphones, may arbitrarily combine the various modules or construct subsystems connected to other modules without departing from this principle. In some embodiments, Figure 14 The acquisition module 1410, determination module 1420, and control module 1430 disclosed herein can be different modules in a bone conduction headset, or a single module can implement the functions of two or more of the aforementioned modules. For example, the modules can share a storage module, or each module can have its own separate storage module. Such variations are all within the scope of protection of this application.

[0116] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0117] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0118] Furthermore, those skilled in the art will understand that aspects of this application can be described and illustrated through several patentable types or situations, including any new and useful combination of processes, machines, products, or substances, or any new and useful improvements thereof. Accordingly, aspects of this application can be implemented entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. All of the above hardware or software may be referred to as a “data block,” “module,” “engine,” “unit,” “component,” or “system.” Furthermore, aspects of this application may manifest as a computer product located on one or more computer-readable media, the product including computer-readable program code.

[0119] Computer storage media may contain a propagated data signal containing computer program code, for example, on baseband or as part of a carrier wave. This propagated signal may take various forms, including electromagnetic, optical, and suitable combinations thereof. Computer storage media can be any computer-readable medium other than a computer-readable storage medium, which can be connected to an instruction execution system, apparatus, or device to enable communication, propagation, or transmission of a program for use. The program code located on the computer storage medium can be propagated through any suitable medium, including radio, cable, fiber optic cable, RF, or similar media, or any combination of the above media.

[0120] The computer program code required for the operation of each part of this application can be written in any one or more programming languages, including object-oriented programming languages ​​such as Java, Scala, Smalltalk, Eiffel, JADE, Emerald, C++, C#, VB.NET, Python, etc., conventional 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. This program code can run entirely on the user's computer, or as a standalone software package on the user's computer, or 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 can be connected to the user's computer through any network, such as a local area network (LAN) or wide area network (WAN), or connected to an external computer (e.g., via the Internet), or in a cloud computing environment, or used as a service such as Software as a Service (SaaS).

[0121] Furthermore, unless expressly stated in the claims, the order of processing elements and sequences, the use of numbers and letters, or other names described in this application are not intended to limit the order of the processes and methods of this application. Although the foregoing disclosure has discussed some currently considered useful embodiments of the invention through various examples, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments; rather, the claims are intended to cover all modifications and equivalent combinations that conform to the substance and scope of the embodiments of this application. For example, while the system components described above can be implemented using hardware devices, they can also be implemented solely through software solutions, such as installing the described system on existing servers or mobile devices.

[0122] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0123] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0124] For each patent, patent application, patent application publication, and other material such as articles, books, specifications, publications, and documents referenced in this application, the entire contents of that patent are incorporated herein by reference. This excludes historical application documents that are inconsistent with or conflict with the content of this application, as well as documents that limit the broadest scope of the claims in this application (currently or subsequently appended to this application). It should be noted that if there are any inconsistencies or conflicts between the descriptions, definitions, and / or terminology used in the supplementary materials of this application and the content of this application, the descriptions, definitions, and / or terminology used in this application shall prevail.

[0125] Finally, it should be understood that the embodiments described in this application are merely illustrative of the principles of the embodiments of this application. Other modifications may also fall within the scope of this application. Therefore, alternative configurations of the embodiments of this application are considered as examples and not limitations, and are regarded as consistent with the teachings of this application. Accordingly, the embodiments of this application are not limited to the embodiments explicitly described and illustrated in this application.

Claims

1. A method for optimizing the working condition of a bone conduction earphone, characterized in that, The bone conduction earphone comprises an earphone core and at least one vibration sensor arranged inside or on the surface of the earphone core, and the method comprises: obtaining a vibration signal by the at least one vibration sensor, the vibration signal at least partially originating from vibration of the earphone core in response to a piece of audio signal, the vibration of the earphone core being configured to be transmitted to a user wearing the bone conduction earphone in a bone conduction manner; based on the vibration signal and the audio signal, obtaining a frequency response curve of the vibration of the earphone core, and determining a vibration response characteristic of the earphone core according to the frequency response curve of the earphone core; and based on the vibration response characteristic of the earphone core, feeding back a working state of the bone conduction earphone.

2. The method of claim 1, wherein, The vibration response characteristic at least comprises one of a resonance frequency, a response peak value of a specific frequency, a quality factor, and an input voltage of the earphone core.

3. The method of claim 1, wherein, The working state of the bone conduction earphone comprises a user wearing state and a user non-wearing state, and the feedback of the working state of the bone conduction earphone based on the vibration response characteristic of the earphone core comprises: based on the vibration response characteristic of the earphone core, judging whether the working state is the user non-wearing state; and if the working state is the user non-wearing state, generating an instruction to adjust the power consumption of the bone conduction earphone.

4. The method of claim 3, wherein, The judgment of whether the working state is the user non-wearing state based on the vibration response characteristic of the earphone core comprises: inputting the vibration response characteristic of the earphone core into a recognition model; and generating a judgment result based on the output of the recognition model.

5. The method of claim 1, wherein, The working state of the bone conduction earphone comprises a user good wearing state and a user non-good wearing state, and the feedback of the working state of the bone conduction earphone based on the vibration response characteristic of the earphone core comprises: based on the vibration response characteristic of the earphone core, judging whether the working state is the user non-good wearing state; and if the working state is the user non-good wearing state, the bone conduction earphone sends a prompt information.

6. The method of claim 5, wherein, The judgment of whether the working state is the user non-good wearing state based on the vibration response characteristic of the earphone core comprises: inputting the vibration response characteristic of the earphone core into a recognition model; and generating a judgment result based on the output of the recognition model.

7. The method of claim 1, wherein, The working state of the bone conduction earphone is related to the clamping force when the user wears the bone conduction earphone, and the feedback of the working state of the bone conduction earphone based on the vibration response characteristic of the earphone core comprises: based on the vibration response characteristic of the earphone core, judging whether the clamping force when the user wears the bone conduction earphone is within a preset range; and if the clamping force is not within the preset range, generating 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.

8. The method of claim 7, wherein, The judgment of whether the clamping force when the user wears the bone conduction earphone is within a preset range based on the vibration response characteristic of the earphone core comprises: inputting the vibration response characteristic of the earphone core into a recognition model; and acquire a parameter value representing the clamping force when the user wears the bone conduction earphone based on the output of the identification model; and determine whether the parameter value is within the preset range.

9. The method of claim 1, wherein, The feedback on the working state of the bone conduction earphone based on the vibration response characteristic of the earphone core includes: identifying the difference between the vibration response characteristic of the earphone core and a target vibration response characteristic; adjusting the audio signal input to the earphone core according to the difference.

10. The method of claim 1, wherein, The working state of the bone conduction earphone includes the input voltage of the earphone core, and the feedback on the working state of the bone conduction earphone based on the vibration response characteristic of the earphone core includes: acquiring a parameter value representing the input voltage of the earphone core based on the vibration response characteristic of the earphone core; determining whether the parameter value is within a voltage threshold; and if the parameter value is not within the voltage threshold, adjusting the amplitude of the audio signal input to the earphone core.

11. The method of claim 1, wherein, The feedback on the working state of the bone conduction earphone based on the vibration response characteristic of the earphone core includes: acquiring a parameter value related to the physiological parameter of the user based on the vibration response characteristic of the earphone core; and based on the parameter value, turning on or off an auxiliary module of the bone conduction earphone.

12. A bone conduction earphone, characterized in that, It includes an acquisition module, a determination module and a control module; The acquisition module acquires a vibration signal through at least one vibration sensor, the vibration signal at least partially originates from the vibration of the earphone core in response to a piece of audio signal, the vibration of the earphone core is configured to be transmitted to the user wearing the bone conduction earphone in a bone conduction manner, and the at least one vibration sensor is arranged inside or on the surface of the earphone core; The determination module acquires the frequency response curve of the vibration of the earphone core based on the vibration signal and the audio signal, and determines the vibration response characteristic of the earphone core according to the frequency response curve of the earphone core; and The control module feeds back the working state of the bone conduction earphone based on the vibration response characteristic of the earphone core.

13. The bone conduction earphone according to claim 12, characterized in that, The vibration response characteristic at least includes one of the resonance frequency, the response peak value of a specific frequency, the quality factor and the input voltage of the earphone core.

14. The bone conduction earphone according to claim 12, characterized in that, The working state of the bone conduction earphone includes the user wearing state and the user not wearing state, and the feedback on the working state of the bone conduction earphone based on the vibration response characteristic of the earphone core includes: The determination module determines whether the working state is the user not wearing state based on the vibration response characteristic of the earphone core; and If the working state is the user not wearing state, the control module generates an instruction to adjust the power consumption of the bone conduction earphone.

15. The bone conduction earphone according to claim 14, characterized in that, The determination of whether the working state is the user not wearing state based on the vibration response characteristic of the earphone core includes: The acquisition module inputs the vibration response characteristic of the earphone core into an identification model; and The determination module generates a determination result based on the output of the identification model.

16. The bone conduction earpiece of claim 12, wherein, The working state of the bone conduction earphone includes the user wearing good state and the user not wearing good state, and the feedback on the working state of the bone conduction earphone based on the vibration response characteristic of the earphone core includes: The determining module determines whether the working state is a user-wearing-unsound state based on the vibration response feature of the earphone core. If the working state is the user-wearing-unsound state, the control module controls the bone conduction earphone to issue a prompt information.

17. The bone conduction earphone according to claim 16, characterized in that, The determining module determines whether the working state is a user-wearing-unsound state based on the vibration response feature of the earphone core. The obtaining module inputs the vibration response feature of the earphone core into a recognition model. The determining module generates a judgment result based on the output of the recognition model.

18. The bone conduction earpiece of claim 12, wherein, The working state of the bone conduction earphone is related to the clamping force when the user wears the bone conduction earphone, and the feedback on the working state of the bone conduction earphone based on the vibration response feature of the earphone core includes: The determining module determines whether the clamping force when the user wears the bone conduction earphone is within a preset range based on the vibration response feature of the earphone core. If the clamping force is not within the preset range, the control module generates an instruction to adjust the structure corresponding to the bone conduction earphone to change the clamping force when the user wears the bone conduction earphone.

19. The bone conduction earphone according to claim 18, characterized in that, The determining module determines whether the clamping force when the user wears the bone conduction earphone is within a preset range based on the vibration response feature of the earphone core. The obtaining module inputs the vibration response feature of the earphone core into a recognition model. The obtaining module obtains a parameter value representing the clamping force when the user wears the bone conduction earphone based on the output of the recognition model. The determining module determines whether the parameter value is within the preset range.

20. The bone conduction earpiece of claim 19, wherein, The feedback on the working state of the bone conduction earphone based on the vibration response feature of the earphone core includes: The determining module identifies the difference between the vibration response feature of the earphone core and a target vibration response feature. The control module adjusts the EQ of the audio signal input into the earphone core according to the difference.

21. The bone conduction earphone according to claim 12, characterized in that, The working state of the bone conduction earphone includes the input voltage of the earphone core, and the feedback on the working state of the bone conduction earphone based on the vibration response feature of the earphone core includes: The obtaining module obtains a parameter value representing the input voltage of the earphone core based on the vibration response feature of the earphone core. The determining module determines whether the parameter value is within a voltage threshold. If the parameter value is not within the voltage threshold, the control module adjusts the amplitude of the audio signal input into the earphone core.

22. The bone conduction earphone according to claim 12, characterized in that, The feedback on the working state of the bone conduction earphone based on the vibration response feature of the earphone core includes: The obtaining module obtains a parameter value related to the user's physiological parameter based on the vibration response feature of the earphone core. The control module turns on or off an auxiliary module of the bone conduction earphone based on the parameter value.

23. A training method of an identification model, the identification model being used in the method of any one of claims 4, 6, 8, the bone conduction earphone of any one of claims 15, 17, 19-20, characterized in that, The training method includes: Obtaining sample information; Determining the sample type of each of the at least two user-wearing records based on the sample information, wherein the sample type includes a positive sample type or a negative sample type; Determining sample feature information corresponding to each of the at least two user-wearing records based on the sample information; and determine the identification model based on the sample feature information and the sample type of each of the at least two user wearing records.

24. The method of claim 23, wherein, For any one of the at least two user wearing records, the sample feature information comprises a vibration response feature of a earpiece core and an operating state of a bone conduction earphone, and based on the sample information, the sample feature information corresponding to the user wearing record is obtained by the following steps: extracting the vibration response feature of the earpiece core based on the sample information corresponding to the user wearing record; and judging the operating state of the bone conduction earphone based on the vibration response feature of the earpiece core.

25. The method of any one of claims 23 or 24, wherein, The identification model comprises at least one of a Naive Bayes model, a linear regression model, a decision tree model or a support vector machine model.

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