Wearing detection circuit, headphone and wearing detection method

Abstract

This application discloses a wear detection circuit, a headset, and a wear detection method, relating to the field of headphone technology. The disclosed wear detection circuit is applied to a headset and includes: a touch detection chip and at least one capacitive sensing electrode; the touch detection chip is connected to the capacitive sensing electrode; the capacitive sensing electrode is disposed inside the earcups of the headset and is used to couple with the human body to form a capacitor when the user wears the headset, and to form a capacitor with the surrounding environment when the user is not wearing the headset; this application uses a capacitive sensing electrode for wear detection, and determines the wearing status by detecting changes in capacitance value, rather than relying on reflected light signals. Therefore, it can effectively avoid the influence of ambient light interference, sweat stains, and objects with different reflectivities on the detection results, accurately identify whether the headset has been removed from the user, and thus disconnect the power supply of high-power modules in a timely manner when not wearing the headset, thereby reducing the standby power consumption of the headset and extending the battery life.

Description

Technical Field

[0001] This application relates to the field of headphone technology, and in particular to a wear detection circuit, a headset, and a wear detection method. Background Technology

[0002] Headphones, with their immersive sound quality and powerful noise cancellation, have been widely used in personal entertainment, business communication, and professional audio monitoring, and are an important part of portable audio devices.

[0003] To automatically shut down audio output and noise cancellation when the user is not wearing the headphones and quickly resume operation when they are wearing them, thereby optimizing device energy efficiency and user experience, headphones typically need to be equipped with wear detection functionality. Currently, the mainstream wear detection solution in the industry is infrared / photoelectric detection. The infrared sensor used typically includes an infrared emitter and a photodiode. The basic working principle is as follows: an infrared emitter and a photodiode are placed inside the earcup. The infrared emitter emits light, and the photodiode receives the reflected infrared light. The system uses the presence or absence or intensity of the received reflected light signal to determine whether the user is wearing the headphones. In other words, the infrared sensor is only responsible for collecting the reflected light signal, which is then read and processed by the main control unit to identify the wearing status.

[0004] However, the aforementioned wearing detection scheme relies on the presence or intensity of reflected light signals to determine the wearing status. This detection method is easily affected by ambient light interference, sweat stains, and objects with different reflectivities (such as desktops, clothing, etc.). The system cannot accurately distinguish between the reflection of human skin and the reflection of other objects. As a result, even after the headphones are removed, the system may still misjudge the wearing status due to the above interference. Consequently, even after the headphones are removed from the user, the relevant high-power modules continue to operate for a long time, resulting in high standby power consumption and a significant reduction in battery life. Summary of the Invention

[0005] The main purpose of this application is to provide a wear detection circuit, a headset, and a wear detection method, which aims to solve the technical problems of high standby power consumption and significantly shortened battery life of existing headsets.

[0006] To achieve the above objectives, this application proposes a wear detection circuit, which is applied to a headset and includes: a touch detection chip and at least one capacitive sensing electrode. The touch detection chip is connected to the capacitive sensing electrode; The capacitive sensing electrode is disposed inside the earcup of the headset, and is used to couple with the human body to form a capacitor when the user wears it, and to form a capacitor with the surrounding environment when the user does not wear it. The touch detection chip is used to collect the current capacitance value of the capacitive sensing electrode; The touch detection chip is also used to obtain the basic capacitance value; The touch detection chip is also used to determine the current rate of change of the current capacitance value relative to the base capacitance value; The touch detection chip is also used to determine the wearing status of the headphones based on the current rate of change.

[0007] In one embodiment, the touch detection chip is further configured to determine whether the current rate of change is greater than a preset rate threshold. The touch detection chip is also used to determine that the headset is in a state where the user is not wearing it when the current rate of change is not greater than the preset rate threshold. The touch detection chip is also used to determine that the headset is being worn by the user when the current rate of change is greater than the preset rate threshold and the current capacitance value is greater than the basic capacitance value.

[0008] In one embodiment, the touch detection chip is further configured to acquire a preset mapping table when the headset is in a state where the user is not wearing it, the preset mapping table including the mapping relationship between the capacitance change rate range and the preset correction coefficient; The touch detection chip is also used to query based on the preset mapping relationship and select the target correction coefficient corresponding to the current rate of change from a plurality of preset correction coefficients; The touch detection chip is also used to update the base capacitance value based on the target correction coefficient.

[0009] In one embodiment, the capacitive sensing electrode includes: a first capacitive sensing electrode and a second capacitive sensing electrode; The earcups of the headphones include: a first earcup and a second earcup; The first capacitive sensing electrode is disposed on the inner side of the first earcup, and the second capacitive sensing electrode is disposed on the inner side of the second earcup. Both the first capacitive sensing electrode and the second capacitive sensing electrode are connected to the touch detection chip. The touch detection chip is used to collect the first capacitance value of the first capacitance sensing electrode and the second capacitance value of the second capacitance sensing electrode, respectively. The touch detection chip is further configured to determine a first rate of change of the first capacitance value relative to the base capacitance value, and to determine a second rate of change of the second capacitance value relative to the base capacitance value. The touch detection chip is also used to determine the wearing state of the headphones based on the first rate of change and the second rate of change.

[0010] In one embodiment, the touch detection chip is further configured to determine that the headset is in a state where the user is not wearing it when neither the first rate of change nor the second rate of change is greater than the preset rate threshold; The touch detection chip is further configured to determine that the headset is being worn by the user when both the first rate of change and the second rate of change are greater than the preset rate threshold, and both the first capacitance value and the second capacitance value are greater than the base capacitance value.

[0011] In one embodiment, the wear detection circuit further includes: a main control unit and a power management unit; The main control unit is connected to the power management unit and the touch detection chip respectively, and the power management unit is connected to the power consumption module; The touch detection chip is also used to output a first trigger signal to the main control unit when the headset is in the state of being worn by the user; The main control unit is configured to connect the power management unit to the power consumption module when it receives the first trigger signal, so that the power management unit supplies power to the power consumption module.

[0012] In one embodiment, the touch detection chip is further configured to output a second trigger signal to the main control unit when the headset is in a state where the user is not wearing it; The main control unit is configured to disconnect the power management unit from the power consumption module after the time between receiving the second trigger signal and the current time reaches a preset duration, so that the power management unit stops supplying power to the power consumption module.

[0013] In one embodiment, the wear detection circuit further includes: at least one reference electrode; The reference electrode is disposed at a preset position inside the headphones and is connected to the touch detection chip; A reference capacitor is formed between the reference electrode and the circuit reference ground of the headset, and the reference capacitance value of the reference capacitor changes with the environment. The touch detection chip is used to obtain the reference capacitance value of the reference electrode; The touch detection chip is used to compensate the current capacitance value of the capacitive sensing electrode based on the reference capacitance value.

[0014] In addition, to achieve the above objectives, this application also proposes a headset, which includes the wearing detection circuit described above; The capacitive sensing electrode in the wear detection circuit is located inside the earcup and is used to couple with the human body to form a capacitance when the user wears the earcup, and to form a capacitance with the surrounding environment when the user is not wearing the earcup.

[0015] Furthermore, to achieve the above objectives, this application also proposes a wear detection method based on the wear detection circuit described above, the wear detection method comprising: Collect the current capacitance value of the capacitive sensing electrode; Obtain the basic capacitance value; Determine the current rate of change of the current capacitance value relative to the base capacitance value; The wearing status of the headphones is determined based on the current rate of change.

[0016] One or more technical solutions proposed in this application have at least the following technical effects: The wearing detection circuit provided in this application is applied to a headset and includes: a touch detection chip and at least one capacitive sensing electrode; the touch detection chip is connected to the capacitive sensing electrode; the capacitive sensing electrode is disposed inside the earcup of the headset and is used to couple with the human body to form a capacitance when the user wears it, and to form a capacitance with the surrounding environment when the user is not wearing it; the touch detection chip of this application collects the current capacitance value of the capacitive sensing electrode; obtains a base capacitance value; determines the current rate of change of the current capacitance value relative to the base capacitance value; and determines the wearing state of the headset based on the current rate of change. Since this application uses a capacitive sensing electrode for wearing detection, and determines the wearing state by detecting changes in capacitance value, rather than relying on reflected light signals, it can effectively avoid the influence of ambient light interference, sweat stains, and objects with different reflectivities on the detection results, accurately identify whether the headset has been removed from the user, and thus promptly disconnect the power supply to the high-power module when not wearing it, thereby reducing the standby power consumption of the headset and extending its battery life. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1This is a schematic diagram of the structure of the first embodiment of the wear detection circuit of this application; Figure 2 This is a schematic diagram of the structure of the headphones described in this application; Figure 3 This is a schematic diagram of the structure of the second embodiment of the wear detection circuit of this application; Figure 4 This is a schematic diagram of the structure of the third embodiment of the wear detection circuit of this application; Figure 5 This is a flowchart illustrating the testing method used in this application.

[0020] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0022] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0023] The wearing detection circuit of this application embodiment includes: a touch detection chip and at least one capacitive sensing electrode; the touch detection chip is connected to the capacitive sensing electrode; the capacitive sensing electrode is disposed inside the earcup of the headset, and is used to couple with the human body to form a capacitor when the user wears it, and to form a capacitor with the surrounding environment when the user does not wear it; the touch detection chip collects the current capacitance value of the capacitive sensing electrode; obtains a base capacitance value; determines the current rate of change of the current capacitance value relative to the base capacitance value; and determines the wearing state of the headset based on the current rate of change.

[0024] Because existing wear detection solutions rely on the presence or intensity of reflected light signals to determine the wearing status, this detection method is easily affected by ambient light interference, sweat stains, and objects with different reflectivities (such as desktops, clothing, etc.). The system cannot accurately distinguish between the reflection of human skin and the reflection of other objects. As a result, even after the headphones are removed, the system may still misjudge the wearing status due to the above interference. Consequently, even after the headphones are removed from the user, the relevant high-power modules continue to run for a long time, resulting in high standby power consumption and a significant reduction in battery life.

[0025] This application provides a solution that uses capacitive sensing electrodes for wear detection. The wearing status is determined by detecting changes in capacitance value, rather than relying on reflected light signals. Therefore, it can effectively avoid the influence of factors such as ambient light interference, sweat stains, and objects with different reflectivities on the detection results, accurately identify whether the headphones have been removed from the user, and promptly disconnect the power supply to the high-power module when not wearing them, thereby reducing the standby power consumption of the headphones and extending the battery life.

[0026] Based on this, embodiments of this application provide a wear detection circuit, referring to... Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the wear detection circuit of this application.

[0027] In this embodiment, the wear detection circuit is applied to a headset, and the wear detection circuit includes: a touch detection chip 10 and at least one capacitive sensing electrode 20.

[0028] The touch detection chip 10 is connected to the capacitive sensing electrode 20.

[0029] It should be noted that the touch detection chip 10 can be a chip that detects the wearing status of the headphones based on the capacitance value.

[0030] Understandably, the capacitive sensing electrode 20 can be a conductor formed of a conductive material (such as copper foil, flexible conductive cloth, metal sheet, or conductive lines printed on a flexible circuit board).

[0031] Further reference Figure 2 , Figure 2 This is a schematic diagram of the structure of the headphones used in this application. Figure 2 In this device, the capacitive sensing electrode 20 is disposed inside the earcup 30 of the headset, and is used to couple with the human body to form a capacitor when the user wears the device, and to form a capacitor with the surrounding environment when the user does not wear the device.

[0032] The touch detection chip 10 is used to collect the current capacitance value of the capacitive sensing electrode 20.

[0033] It should be noted that the current capacitance value can be the value of the capacitance formed between the capacitance sensing electrode 20 and the human body or the surrounding environment at the current moment.

[0034] Understandably, when a user wears headphones, the human body, as a conductor, approaches or contacts the capacitive sensing electrode 20, forming a coupling capacitance between the human body and the capacitive sensing electrode 20. This coupling capacitance is superimposed on the inherent capacitance of the capacitive sensing electrode 20 itself, increasing the total capacitance value on the capacitive sensing electrode 20. When the user is not wearing the headphones, there is an inherent parasitic capacitance between the capacitive sensing electrode 20 and the circuit reference ground and the surrounding environment (such as air, headphone shell, etc.). In this case, the capacitance value on the capacitive sensing electrode 20 reflects the background capacitance of the environment.

[0035] In its implementation, the touch detection chip 10 applies a corresponding detection signal to the capacitive sensing electrode 20 through its sensing channel. The touch detection chip 10 integrates a capacitance-to-digital converter. Changes in the capacitance value on the capacitive sensing electrode 20 cause changes in parameters such as the amplitude, frequency, or charging / discharging time of the detection signal. The capacitance-to-digital converter converts this change into a digital signal, and the touch detection chip 10 obtains the current capacitance value by reading this digital signal.

[0036] The touch detection chip 10 is also used to obtain the basic capacitance value.

[0037] It should be noted that the base capacitance value can be the capacitance value of the capacitive sensing electrode 20 when there is no human contact. This base capacitance value can be updated using real-time capacitance values ​​collected during the continuous period when the headphones are not worn, to adapt to environmental changes.

[0038] In the specific implementation, the touch detection chip 10 updates the basic capacitance value by determining the capacitance value collected when the headset is not worn in the previous round (i.e., the time period before the current moment), so that the basic capacitance value can be dynamically adjusted according to changes in environmental factors such as temperature and humidity.

[0039] The touch detection chip 10 is also used to determine the current rate of change of the current capacitance value relative to the base capacitance value.

[0040] It should be noted that the current rate of change can be a physical quantity that characterizes how quickly the current capacitance value changes relative to the baseline capacitance value over time. When a user wears or removes the aforementioned headphones, the current capacitance value changes rapidly, and the current rate of change increases accordingly; when environmental factors change slowly, the current capacitance value drifts slowly, and the current rate of change decreases accordingly.

[0041] In a specific implementation, the touch detection chip 10 can acquire the capacitance value of the capacitive sensing electrode 20 in multiple consecutive sampling periods and record the capacitance value obtained in each sampling. Subsequently, the touch detection chip 10 can calculate the difference between two adjacent sampling values ​​and divide it by the sampling interval time, using the result as the current rate of change of the current capacitance value relative to the base capacitance value; or, the touch detection chip 10 can perform linear fitting on the capacitance values ​​acquired in multiple consecutive sampling periods and use the slope obtained from the fitting as the current rate of change of the current capacitance value relative to the base capacitance value.

[0042] The touch detection chip 10 is also used to determine the wearing status of the headphones based on the current rate of change.

[0043] It should be noted that the touch detection chip 10 can use the magnitude of the current rate of change to measure the speed of change in capacitance value on the capacitive sensing electrode 20, and the speed of change in capacitance value is related to whether the user is wearing the aforementioned headphones. When the user wears or removes the aforementioned headphones, the capacitance value on the capacitive sensing electrode 20 changes rapidly, with a large current rate of change; when the user is not wearing the aforementioned headphones and environmental factors change slowly, the capacitance value on the capacitive sensing electrode 20 changes slowly, with a small current rate of change. Therefore, the touch detection chip 10 can determine whether the headphones are currently being worn or not by judging the specific value of the current rate of change.

[0044] Specifically, the touch detection chip 10 is further configured to determine whether the current rate of change is greater than a preset rate threshold; when the current rate of change is not greater than the preset rate threshold, determine that the headset is in a state where the user is not wearing it; when the current rate of change is greater than the preset rate threshold and the current capacitance value is greater than the basic capacitance value, determine that the headset is in a state where the user is wearing it.

[0045] It should be noted that the preset rate threshold can be a pre-set critical value used to distinguish the rate of change of capacitance value on the capacitive sensing electrode 20. When the rate of change of capacitance value is greater than the preset rate threshold, it indicates that the capacitance value has changed rapidly, corresponding to a switch in the wearing state of the headphones (wearing or removing); when the rate of change of capacitance value is not greater than the preset rate threshold, it indicates that the capacitance value has not changed rapidly, corresponding to no switch in the wearing state of the headphones or a stable state.

[0046] In a specific implementation, the touch detection chip 10 can compare the current rate of change with a preset rate threshold. When the current rate of change is not greater than the preset rate threshold, the current rate of change is small, indicating that the capacitance value on the capacitive sensing electrode 20 has not changed rapidly, that is, no human body is near or in contact with the capacitive sensing electrode 20, and it is determined that the headset is not being worn by the user.

[0047] When the current rate of change exceeds a preset rate threshold, the touch detection chip 10 compares the current capacitance value with the base capacitance value. If the current capacitance value is greater than the base capacitance value, it indicates that the capacitance value on the capacitive sensing electrode 20 has increased rapidly, meaning that a coupling capacitance has been formed between the human body and the capacitive sensing electrode 20, and the user determines that the headset is being worn. If the current rate of change exceeds the preset rate threshold, and the current capacitance value is less than or equal to the base capacitance value, it indicates that the capacitance value on the capacitive sensing electrode 20 has decreased rapidly, meaning that the coupling capacitance is disappearing, corresponding to the scenario where the headset is being removed by the user. In this case, the touch detection chip 10 determines that the headset is not being worn by the user.

[0048] It should be understood that by comparing the current rate of change with a preset rate threshold, the headset is determined to be in an unworn state when the current rate of change is not greater than the preset rate threshold, and in a worn state when the current rate of change is greater than the preset rate threshold and the current capacitance value is greater than the basic capacitance value. This further clarifies under what conditions the current rate of change corresponds to the worn state and under what conditions it corresponds to the unworn state, so that the touch detection chip 10 has a clear judgment basis in the determination process, thereby improving the accuracy and reliability of the wearing state determination.

[0049] In this embodiment, the touch detection chip 10 is also used to obtain a preset mapping table when the headset is in a state where the user is not wearing it. The preset mapping table includes the mapping relationship between the capacitance change rate range and the preset correction coefficient.

[0050] It should be noted that the preset correction factor can represent how quickly the base capacitance value approaches the current capacitance value. The larger the preset correction factor, the faster the base capacitance value approaches the current capacitance value; the smaller the preset correction factor, the slower the base capacitance value approaches the current capacitance value.

[0051] In practice, the rate of change of different capacitance values ​​can be divided into multiple continuous intervals in advance, with each interval corresponding to a preset correction coefficient.

[0052] It should be understood that in practical applications, the rate of change of capacitance value is essentially a reflection of various physical causes (such as environmental drift, touch events, etc.) in the dimension of change rate. By setting several dividing points (i.e., different rate thresholds) within the continuous range of change rate values, different physical causes can be distinguished in the rate dimension, and differentiated update strategies can be matched for different physical causes. For example, when the change rate is less than the first rate threshold, it is determined to be slow environmental drift, in which case fast tracking is not required, and a small preset correction coefficient is used; when the change rate is greater than or equal to the first rate threshold and less than the second rate threshold, a medium-sized preset correction coefficient is used; when the change rate is greater than or equal to the second rate threshold, it is determined to be a fast event (such as wearing or removing), and a large preset correction coefficient is used.

[0053] It should be noted that the specific values ​​of the rate thresholds (including the first rate threshold and the second rate threshold) and the specific values ​​of the preset correction coefficients can be obtained in advance through a limited number of experiments based on the actual application scenario of the headset and the performance of the touch detection chip 10. This embodiment does not impose specific limitations on this.

[0054] The touch detection chip 10 is also used to query the corresponding target correction coefficient in the preset mapping relationship based on the interval corresponding to the current rate of change.

[0055] It should be noted that the target correction factor can be a preset correction factor that matches the current rate of change.

[0056] In a specific implementation, after determining the current rate of change, the touch detection chip 10 first determines the rate of change interval to which the current rate of change belongs in the preset mapping relationship. Then, using this interval as an index, it queries and reads the preset correction coefficient corresponding to the current rate of change in the preset mapping relationship, and uses it as the target correction coefficient.

[0057] It should be noted that the preset mapping relationship can be stored in the touch detection chip 10 in the form of a lookup table. Each entry in the lookup table corresponds to a change rate interval, and each entry stores a preset correction coefficient corresponding to that change rate interval. By matching the current change rate with each change rate interval in the lookup table, the touch detection chip 10 can read the corresponding preset correction coefficient as the target correction coefficient.

[0058] The touch detection chip 10 is also used to update the base capacitance value based on the target correction coefficient.

[0059] In a specific implementation, the touch detection chip 10 can calculate the difference between the current capacitance value and the base capacitance value; then, the touch detection chip 10 multiplies the difference by the target correction coefficient to obtain the adjustment amount for this update; finally, the touch detection chip 10 adds the adjustment amount to the base capacitance value to obtain the updated base capacitance value.

[0060] It should be understood that the value of the target correction factor determines how quickly the base capacitance value approaches the current capacitance value. The larger the target correction factor, the faster the base capacitance value approaches the current capacitance value, and the more quickly the update of the base capacitance value can follow environmental changes; the smaller the target correction factor, the slower the base capacitance value approaches the current capacitance value, and the more stable the update of the base capacitance value can remain, filtering out noise and slowly changing interference.

[0061] It should be noted that the touch detection chip 10 only updates the basic capacitance value when the headphones are not worn by the user, and freezes the update of the basic capacitance value when the headphones are worn by the user.

[0062] Understandably, by updating the base capacitance value according to the corresponding target correction coefficient based on the current rate of change, the update speed of the base capacitance value can be adaptively adjusted according to the actual changes in the environment. When the current rate of change is large, the matched target correction coefficient is correspondingly large, and the update speed of the base capacitance value is faster, so that the base capacitance value can quickly follow the capacitance drift caused by environmental factors (such as changes in temperature and humidity), avoiding reference value lag. When the current rate of change is small, the matched target correction coefficient is correspondingly small, and the update speed of the base capacitance value is slower, thereby suppressing the influence of noise and slowly changing interference on the reference value. As a result, the base capacitance value can maintain a stable reference adapted to the current environment under different conditions, effectively improving the accuracy of wearing status determination.

[0063] The wear detection circuit provided in this embodiment is applied to a headset and includes: a touch detection chip and at least one capacitive sensing electrode; the touch detection chip is connected to the capacitive sensing electrode; the capacitive sensing electrode is disposed inside the earcup of the headset and is used to couple with the human body to form capacitance when the user wears the headset, and to form capacitance with the surrounding environment when the user is not wearing the headset; the touch detection chip of this embodiment collects the current capacitance value of the capacitive sensing electrode; obtains a base capacitance value; determines the current rate of change of the current capacitance value relative to the base capacitance value; and determines the wearing state of the headset based on the current rate of change. Since this embodiment uses a capacitive sensing electrode for wear detection, and determines the wearing state by detecting changes in capacitance value, rather than relying on reflected light signals, it can effectively avoid the influence of ambient light interference, sweat stains, and objects with different reflectivities on the detection results, accurately identify whether the headset has been removed from the user, and thus can disconnect the power supply of high-power modules in time when not wearing the headset, thereby reducing the standby power consumption of the headset and extending the battery life.

[0064] Based on the first embodiment of this application, a second embodiment of this application is proposed. In the second embodiment, content that is the same as or similar to that in the first embodiment can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 3 , Figure 3 This is a schematic diagram of the structure of the second embodiment of the wear detection circuit of this application. In this embodiment, the capacitive sensing electrode 20 includes: a first capacitive sensing electrode 21 and a second capacitive sensing electrode 22.

[0065] like Figure 2 As shown, the earcups 30 of the headphones include: a first earcup 31 and a second earcup 32.

[0066] The first capacitive sensing electrode 21 is disposed on the inner side of the first earcup 31, and the second capacitive sensing electrode 21 is disposed on the inner side of the second earcup 32. Both the first capacitive sensing electrode 21 and the second capacitive sensing electrode 21 are connected to the touch detection chip 10.

[0067] It should be noted that both the first capacitive sensing electrode 21 and the second capacitive sensing electrode 22 can be conductors formed of conductive materials.

[0068] Understandably, the first earcup 31 can be the left earcup of a headset, used to cover the user's left ear and to house the first capacitive sensing electrode 21. The second earcup 32 can be the right earcup of a headset, used to cover the user's right ear and to house the second capacitive sensing electrode 22.

[0069] The touch detection chip 10 is used to collect the first capacitance value of the first capacitive sensing electrode 21 and the second capacitance value of the second capacitive sensing electrode 22, respectively.

[0070] It should be noted that the first capacitive sensing electrode 21 is used to couple with the human body to form a corresponding capacitance when the user wears it, and to form a corresponding capacitance with the surrounding environment when the user is not wearing it. The first capacitance value can be a specific value of the capacitance formed by the first capacitive sensing electrode 21.

[0071] Understandably, the second capacitive sensing electrode 22 is used to couple with the human body to form a corresponding capacitance when the user wears it, and to form a corresponding capacitance with the surrounding environment when the user is not wearing it. The second capacitance value can be a specific numerical value of the capacitance formed by the second capacitive sensing electrode 22.

[0072] In its implementation, the touch detection chip 10 is electrically connected to the first capacitive sensing electrode 21 and the second capacitive sensing electrode 22 through multiple sensing channels. The touch detection chip 10 applies a corresponding detection signal to the first capacitive sensing electrode 21 through the first sensing channel and acquires a first capacitance value on the first capacitive sensing electrode 21; the touch detection chip 10 applies a corresponding detection signal to the second capacitive sensing electrode 22 through the second sensing channel and acquires a second capacitance value on the second capacitive sensing electrode 22. The first and second sensing channels are independent of each other and do not interfere with each other.

[0073] The touch detection chip 10 is further configured to determine a first rate of change of the first capacitance value relative to the base capacitance value, and to determine a second rate of change of the second capacitance value relative to the base capacitance value.

[0074] In a specific implementation, for the first capacitive sensing electrode 21, the touch detection chip 10 acquires the first capacitance value in multiple consecutive sampling periods and records the first capacitance value obtained in each sampling. Subsequently, the touch detection chip 10 calculates the difference between two adjacent sampling values ​​and divides it by the sampling interval time, using the result as the first rate of change of the first capacitance value relative to the base capacitance value; or, the touch detection chip 10 performs linear fitting on the first capacitance values ​​acquired in multiple consecutive sampling periods and uses the slope obtained from the fitting as the first rate of change.

[0075] For the second capacitive sensing electrode 22, the touch detection chip 10 acquires the second capacitance value in multiple consecutive sampling periods in the same manner and records the second capacitance value obtained in each sampling. Subsequently, the touch detection chip 10 calculates the difference between two adjacent sampling values ​​and divides it by the sampling interval time, using the result as the second rate of change of the second capacitance value relative to the base capacitance value; or, the touch detection chip 10 performs linear fitting on the second capacitance values ​​acquired in multiple consecutive sampling periods and uses the slope obtained from the fitting as the second rate of change.

[0076] The touch detection chip 10 is also used to determine the wearing state of the headphones based on the first change rate and the second change rate.

[0077] In a specific implementation, the touch detection chip 10 can determine whether the headphones are currently being worn or not by combining the value ranges of the first change rate and the second change rate.

[0078] Specifically, the touch detection chip 10 is further configured to determine that the headset is not being worn by the user when neither the first rate of change nor the second rate of change is greater than the preset rate threshold.

[0079] The touch detection chip 10 is further configured to determine that the headset is being worn by the user when both the first rate of change and the second rate of change are greater than the preset rate threshold, and both the first capacitance value and the second capacitance value are greater than the base capacitance value.

[0080] In its implementation, the touch detection chip 10 compares a first rate of change with a preset rate threshold, and simultaneously compares a second rate of change with the preset rate threshold. When neither the first nor the second rate of change exceeds the preset rate threshold, the touch detection chip 10 determines that the headset is not being worn by the user. At this time, the capacitance values ​​on the first capacitive sensing electrode 21 and the second capacitive sensing electrode 22 do not change rapidly, meaning that neither the user's left nor right ear is near or in contact with the first or second capacitive sensing electrode 21, thus determining that the headset is not currently being worn by the user.

[0081] When both the first rate of change and the second rate of change are greater than a preset rate threshold, and both the first capacitance value and the second capacitance value are greater than a base capacitance value, the touch detection chip 10 determines that the headset is being worn by the user. At this time, the capacitance values ​​on the first capacitance sensing electrode 21 and the second capacitance sensing electrode 22 both rise rapidly, meaning that coupling capacitances are formed between the user's left and right ears and the first capacitance sensing electrode 21 and the second capacitance sensing electrode 22, respectively, thus determining that the headset is currently being worn by the user.

[0082] It should be noted that when actually wearing the headphones, the user's left and right ears need to simultaneously contact the inner sides of the first earcup 31 and the second earcup 32, respectively. Therefore, the first capacitive sensing electrode 21 and the second capacitive sensing electrode 22 should simultaneously detect a rapid increase in capacitance value. If only one capacitive sensing electrode detects a rate of change greater than a preset rate threshold, it may indicate that the user is touching or holding one earcup of the headphones, rather than actually wearing them. By requiring that the rate of change corresponding to both capacitive sensing electrodes be greater than the preset rate threshold before determining a wearing state, interference from non-wearing scenarios such as one-sided touching or one-handed holding can be effectively eliminated, reducing the false positive rate.

[0083] Based on the first and second embodiments of this application, a third embodiment of this application is proposed. In this third embodiment, content that is the same as or similar to the first and second embodiments described above can be referred to the above description and will not be repeated hereafter. Based on this, please refer to... Figure 4 , Figure 4 This is a schematic diagram of the structure of the third embodiment of the wear detection circuit of this application.

[0084] In this embodiment, the wear detection circuit further includes: a main control unit 40 and a power management unit 50; The main control unit 40 is connected to the power management unit 50 and the touch detection chip 10, respectively, and the power management unit 50 is connected to the power consumption module 60.

[0085] It should be noted that the main control unit 40 can be a component that controls the power supply of the power consumption module 60, such as a microcontroller.

[0086] Understandably, the power management unit 50 may be a circuit that supplies power to the power consumption module 60.

[0087] It should be noted that the power consumption module 60 can be a functional module other than the wear detection circuit that requires power and whose operating current is higher than that of the wear detection circuit, such as a Bluetooth communication module, an audio decoding module, an active noise cancellation module, etc.

[0088] The touch detection chip 10 is also used to output a first trigger signal to the main control unit 40 when the headset is in the state of being worn by the user.

[0089] It should be noted that the first trigger signal can be a signal that triggers the power management unit 50 to supply power to the power consumption module 60.

[0090] In a specific implementation, when the touch detection chip 10 determines that the headset is being worn by the user, it outputs a first trigger signal to the signal input port of the main control unit 40 through its signal output port.

[0091] The main control unit 40 is configured to connect the power management unit 50 to the power consumption module 60 when it receives the first trigger signal, so that the power management unit 50 supplies power to the power consumption module 60.

[0092] In its implementation, the main control unit 40 detects the signals output by the touch detection chip 10 in real time through its general-purpose input / output port. When the main control unit 40 detects and receives the first trigger signal, it can send a corresponding turn-on control signal (i.e., a signal that triggers the connection with the power consumption module 60) to the control input of the power management unit 50 through its control output. The power management unit 50 integrates a power switch (such as a metal-oxide-semiconductor field-effect transistor). After receiving the turn-on control signal, the power management unit 50 turns on its internal power switch, making the electrical connection between the power output of the power management unit 50 and the power input of the power consumption module 60 conductive. At this time, the power management unit 50 begins to supply power to the power consumption module 60.

[0093] The touch detection chip 10 is also used to output a second trigger signal to the main control unit 40 when the headset is in a state where the user is not wearing it.

[0094] It should be noted that the second trigger signal can be a signal that triggers the power management unit 50 to stop supplying power to the power consumption module 60. The second trigger signal has the opposite signal form to the first trigger signal. When the first trigger signal is a high-level signal, the second trigger signal is a low-level signal; when the first trigger signal is a low-level signal, the second trigger signal is a high-level signal. The touch detection chip 10 outputs either the first trigger signal or the second trigger signal on the same signal output port, and the main control unit 40 can distinguish between the wearing state and the non-wearing state by detecting the level state of this signal port.

[0095] In a specific implementation, when the touch detection chip 10 determines that the headset is being worn by the user, it outputs a second trigger signal to the signal input port of the main control unit 40 through its signal output port.

[0096] The main control unit 40 is configured to disconnect the power management unit 50 from the power consumption module 60 after the time between receiving the second trigger signal and the current time reaches a preset time, so that the power management unit 50 stops supplying power to the power consumption module 60.

[0097] It should be noted that the preset duration can be a pre-set duration used to determine whether the duration is relatively long. The preset duration can be preset according to the actual application scenario of the headphones. For example, the preset duration can be 3 seconds, but this embodiment of the invention does not specifically limit this. The preset duration can also be other time values, as long as it can avoid frequent on / off switching caused by the user briefly adjusting the position of the headphones.

[0098] In its implementation, the main control unit 40 detects the signals output by the touch detection chip 10 in real time through its general-purpose input / output port. When the main control unit 40 detects and receives the second trigger signal, it records the moment the second trigger signal is received and starts its internal timer. The internal timer of the main control unit 40 begins counting, and the main control unit 40 continuously queries the difference between the current moment and the moment the second trigger signal is received. When this difference has not reached a preset duration, the main control unit 40 continues to maintain the electrical connection between the power management unit 50 and the power consumption module 60 in a conducting state, and the power management unit 50 continues to supply power to the power consumption module 60.

[0099] When the difference reaches a preset time, the main control unit 40 sends a corresponding disconnection control signal (i.e., a signal triggering disconnection from the power consumption module 60) to the control input of the power management unit 50 through its control output terminal. The power management unit 50 integrates a power switch. Upon receiving the disconnection control signal, the power management unit 50 disconnects its internal power switch, thus breaking the electrical connection between the power output terminal of the power management unit 50 and the power input terminal of the power consumption module 60. At this time, the power management unit 50 stops supplying power to the power consumption module 60.

[0100] After power supply to the power consumption module 60 is stopped, the power management unit 50 continues to supply power to the touch detection chip 10 and the main control unit 40 to maintain the normal operation of the wear detection circuit. After disconnecting the power supply to the power consumption module 60, the main control unit 40 continues to maintain control over the power management unit 50 so that the electrical connection between the power management unit 50 and the power consumption module 60 can be re-established when the first trigger signal is received subsequently.

[0101] It should be understood that, based on the first or second trigger signal output by the touch detection chip 10, the electrical connection between the power management unit 50 and the power consumption module 60 is controlled to be turned on or off accordingly: when the headphones are worn, the main control unit 40 controls the power management unit 50 to supply power to the power consumption module 60, enabling the power consumption module 60 to work normally and ensuring that the various functions of the headphones (such as Bluetooth communication, audio decoding, active noise cancellation, etc.) are used normally; when the headphones are not worn, the main control unit 40 controls the power management unit 50 to disconnect the electrical connection with the power consumption module 60 after a preset delay, so that the power consumption module 60 stops consuming power, and only the touch detection chip 10 and the main control unit 40 and other wear detection circuits continue to work. Therefore, this application can provide normal power supply when the user is wearing the headphones to ensure headphone functionality, and simultaneously cut off the power supply to the power consumption module 60 in a timely manner when the user is not wearing the headphones to avoid unnecessary power consumption, thereby effectively reducing standby power consumption and extending the single-charge battery life of the headphones.

[0102] In this embodiment, refer to Figure 4 The wear detection circuit further includes at least one reference electrode 70.

[0103] The reference electrode 70 is disposed at a preset position inside the headphones and is connected to the touch detection chip 10.

[0104] A reference capacitor is formed between the reference electrode 70 and the circuit reference ground of the headset, and the reference capacitance value of the reference capacitor changes with the environment.

[0105] It should be noted that the reference electrode can be a conductor formed from conductive materials (such as copper foil, flexible conductive cloth, metal sheet, or conductive lines printed on a flexible circuit board). The reference electrode 70 and the capacitive sensing electrode 20 adopt the same physical structure and wiring method. Both have similar temperature coefficients and humidity coefficients in their parasitic capacitance relative to the circuit reference ground. Therefore, the effect of environmental changes on the capacitance value of the reference electrode 70 is basically the same as the effect on the capacitance value of the capacitive sensing electrode 20.

[0106] Understandably, the preset position can be a location within the headphones that is unaffected by human contact. This position is away from areas the user may come into contact with, such as the inside of the earcups, so that the reference electrode 70 will not generate a coupling capacitance signal at this location due to user wearing or touching. The preset position can be located inside the headphone housing or near the main control circuit board.

[0107] It should be noted that the reference electrode 70 is set in a preset position inside the headphones, a position unaffected by human contact. Its capacitance value only reflects the influence of environmental factors (such as temperature and humidity) on capacitance detection, and does not include the coupling capacitance signal generated by human wearing.

[0108] The touch detection chip 10 is used to obtain the reference capacitance value of the reference electrode 70.

[0109] In a specific implementation, the touch detection chip 10 can apply a corresponding detection signal to the reference electrode 70 through its reference channel and acquire the reference capacitance value on the reference electrode 70. The method by which the touch detection chip 10 acquires the reference capacitance value is the same as the method by which it acquires the capacitance values ​​of the first capacitance sensing electrode 21 and the second capacitance sensing electrode 22, that is, it uses a capacitance-to-digital converter to convert the capacitance change on the reference electrode 70 into a digital signal, and the touch detection chip 10 can obtain the reference capacitance value by reading this digital signal.

[0110] The touch detection chip 10 is used to compensate the current capacitance value of the capacitive sensing electrode based on the reference capacitance value.

[0111] In a specific implementation, the touch detection chip 10 acquires the current capacitance value of the capacitive sensing electrode 20 and the reference capacitance value of the reference electrode 70. The touch detection chip 10 subtracts the reference capacitance value from the current capacitance value to obtain the compensated capacitance value. Alternatively, the touch detection chip 10 acquires the first capacitance value of the first capacitive sensing electrode 21 and the second capacitance value of the second capacitive sensing electrode 22, and the reference capacitance value of the reference electrode 70. The touch detection chip 10 subtracts the reference capacitance value from both the first and second capacitance values ​​to obtain the corresponding compensated capacitance values. Through the above compensation operation, the influence of environmental factors (such as changes in temperature and humidity) on the detection results of the capacitive sensing electrode 20 is eliminated. The compensated capacitance value can more accurately reflect the coupling capacitance signal generated by the human body wearing the device, thereby improving the accuracy of wear detection.

[0112] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the wear detection circuit of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0113] This application also provides a headset; please refer to... Figure 2 The headset includes the wear detection circuit described above. The capacitive sensing electrode in the wear detection circuit is disposed inside the earcup 30, and is used to couple with the human body to form a capacitance when the user wears the headset, and to form a capacitance with the surrounding environment when the user is not wearing the headset.

[0114] The headphones provided in this application employ the wear detection circuit described in the above embodiments, which solves the technical problems of high standby power consumption and significantly shortened battery life in existing headphones. Compared with the prior art, the beneficial effects of the headphones provided in this application are the same as those of the wear detection circuit provided in the above embodiments, and other technical features of the headphones are the same as those disclosed in the wear detection circuit embodiments, and will not be repeated here.

[0115] This application also proposes a wearing detection method based on the wearing detection circuit described above, referring to... Figure 5 , Figure 5 This is a flowchart illustrating the wearing detection method of this application, which includes steps S10 to S40: Step S10: Collect the current capacitance value of the capacitive sensing electrode.

[0116] Step S20: Obtain the basic capacitance value.

[0117] Step S30: Determine the current rate of change of the current capacitance value relative to the base capacitance value.

[0118] Step S40: Determine the wearing status of the headphones based on the current rate of change.

[0119] The wearing detection method provided in this application, based on the wearing detection circuit in the above embodiments, can also solve the technical problems of high standby power consumption and significantly shortened battery life of existing headphones. Compared with the prior art, the beneficial effects of the wearing detection method provided in this application are the same as those of the wearing detection circuit provided in the above embodiments, and other technical features in the wearing detection method are the same as those disclosed in the above wearing detection circuit embodiments, and will not be repeated here.

[0120] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A wear detection circuit, characterized in that, The wear detection circuit is applied to headphones and includes: a touch detection chip and at least one capacitive sensing electrode; The touch detection chip is connected to the capacitive sensing electrode; The capacitive sensing electrode is disposed inside the earcup of the headset, and is used to couple with the human body to form a capacitor when the user wears it, and to form a capacitor with the surrounding environment when the user does not wear it. The touch detection chip is used to collect the current capacitance value of the capacitive sensing electrode; The touch detection chip is also used to obtain the basic capacitance value; The touch detection chip is also used to determine the current rate of change of the current capacitance value relative to the base capacitance value; The touch detection chip is also used to determine the wearing status of the headphones based on the current rate of change.

2. The wear detection circuit as described in claim 1, characterized in that, The touch detection chip is also used to determine whether the current rate of change is greater than a preset rate threshold. The touch detection chip is also used to determine that the headset is in a state where the user is not wearing it when the current rate of change is not greater than the preset rate threshold. The touch detection chip is also used to determine that the headset is being worn by the user when the current rate of change is greater than the preset rate threshold and the current capacitance value is greater than the basic capacitance value.

3. The wear detection circuit as described in claim 2, characterized in that, The touch detection chip is also used to obtain a preset mapping table when the headset is in a state where the user is not wearing it. The preset mapping table includes a mapping relationship between the capacitance change rate range and a preset correction coefficient. The touch detection chip is also used to query based on the preset mapping relationship and select the target correction coefficient corresponding to the current rate of change from a plurality of preset correction coefficients; The touch detection chip is also used to update the base capacitance value based on the target correction coefficient.

4. The wear detection circuit as described in claim 3, characterized in that, The capacitance sensing electrode includes: a first capacitance sensing electrode and a second capacitance sensing electrode; The earcups of the headphones include: a first earcup and a second earcup; The first capacitive sensing electrode is disposed on the inner side of the first earcup, and the second capacitive sensing electrode is disposed on the inner side of the second earcup. Both the first capacitive sensing electrode and the second capacitive sensing electrode are connected to the touch detection chip. The touch detection chip is used to collect the first capacitance value of the first capacitance sensing electrode and the second capacitance value of the second capacitance sensing electrode, respectively. The touch detection chip is further configured to determine a first rate of change of the first capacitance value relative to the base capacitance value, and to determine a second rate of change of the second capacitance value relative to the base capacitance value. The touch detection chip is also used to determine the wearing state of the headphones based on the first rate of change and the second rate of change.

5. The wear detection circuit as described in claim 4, characterized in that, The touch detection chip is also used to determine that the headset is in a state where the user is not wearing it when neither the first rate of change nor the second rate of change is greater than the preset rate threshold. The touch detection chip is further configured to determine that the headset is being worn by the user when both the first rate of change and the second rate of change are greater than the preset rate threshold, and both the first capacitance value and the second capacitance value are greater than the base capacitance value.

6. The wear detection circuit as described in claim 1, characterized in that, The wear detection circuit also includes: a main control unit and a power management unit; The main control unit is connected to the power management unit and the touch detection chip respectively, and the power management unit is connected to the power consumption module; The touch detection chip is also used to output a first trigger signal to the main control unit when the headset is in the state of being worn by the user; The main control unit is configured to connect the power management unit to the power consumption module when it receives the first trigger signal, so that the power management unit supplies power to the power consumption module.

7. The wear detection circuit as described in claim 6, characterized in that, The touch detection chip is also used to output a second trigger signal to the main control unit when the headset is in a state where the user is not wearing it; The main control unit is configured to disconnect the power management unit from the power consumption module after the time between receiving the second trigger signal and the current time reaches a preset duration, so that the power management unit stops supplying power to the power consumption module.

8. The wear detection circuit as described in claim 1, characterized in that, The wear detection circuit further includes: at least one reference electrode; The reference electrode is disposed at a preset position inside the headphones and is connected to the touch detection chip; A reference capacitor is formed between the reference electrode and the circuit reference ground of the headset, and the reference capacitance value of the reference capacitor changes with the environment. The touch detection chip is used to obtain the reference capacitance value of the reference electrode; The touch detection chip is used to compensate the current capacitance value of the capacitive sensing electrode based on the reference capacitance value.

9. A type of over-ear headphone, characterized in that, The headset includes the wearing detection circuit according to any one of claims 1 to 8; The capacitive sensing electrode in the wear detection circuit is located inside the earcup and is used to couple with the human body to form a capacitance when the user wears the earcup, and to form a capacitance with the surrounding environment when the user is not wearing the earcup.

10. A method for detecting wear based on the wear detection circuit according to any one of claims 1 to 8, characterized in that, The wearing detection method includes: Collect the current capacitance value of the capacitive sensing electrode; Obtain the basic capacitance value; Determine the current rate of change of the current capacitance value relative to the base capacitance value; The wearing status of the headphones is determined based on the current rate of change.

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