CN113038320A - Capacitance detection method and device and earphone - Google Patents
Capacitance detection method and device and earphone Download PDFInfo
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- CN113038320A CN113038320A CN202110221176.XA CN202110221176A CN113038320A CN 113038320 A CN113038320 A CN 113038320A CN 202110221176 A CN202110221176 A CN 202110221176A CN 113038320 A CN113038320 A CN 113038320A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1041—Mechanical or electronic switches, or control elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
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Abstract
In the scheme of the application, for the capacitance detection device, a reference channel for collecting drift caused by temperature change is designed besides a measurement channel, one end of the reference channel is placed in a floating mode, and the wiring of the reference channel is accompanied with the wiring of the measurement channel. Because the influence of temperature on the reference channel and the measurement channel is consistent, if the capacitance measurement value drifts due to temperature change, the reference channel and the measurement channel synchronously change and drift simultaneously, but the difference does not change along with the temperature, the two are subtracted, namely the capacitance measurement value of the reference channel is subtracted from the capacitance measurement value of the measurement channel, so that the drift caused by the temperature change can be inhibited, and a more accurate capacitance detection value is obtained, thereby avoiding misjudgment caused by the temperature change, improving the accuracy of capacitance detection, and improving user experience.
Description
Technical Field
The present application relates to the field of circuit technologies, and in particular, to a capacitance detection method and apparatus, and an earphone.
Background
In electronic devices such as mobile phones and headsets, it is often necessary to recognize a touch operation of a user on a screen or a housing by detecting a change in capacitance. Taking an earphone as an example, such as a TWS (true wireless stereo) earphone, in the prior art, a capacitance value of an input channel may be detected, and the detected capacitance value may be compared with a threshold value, so as to make a corresponding determination.
However, the inventor finds that in the process of implementing the scheme of the application, the change of the temperature may cause the drift of the capacitance detection value, which greatly increases the probability of misjudgment. For example, after a user takes out the earphone from the earphone chamber and puts the earphone into the ear, the temperature of the earphone changes from the original temperature to the temperature of a human body, and the detected capacitance value is easy to drift due to the temperature change, so that the capacitance judgment is wrong, and the earphone generates misjudgment on the touch and other operations of the user. For another example, when a user wears the earphone and walks from a hot outdoor to a cool indoor, the temperature of the earphone may change to a certain extent, and such a temperature change may cause an error in capacitance determination.
Disclosure of Invention
The application provides a capacitance detection method and device and an earphone, and aims to solve the problem that capacitance judgment is wrong due to temperature change.
According to a first aspect of an embodiment of the present application, a capacitance detection method is provided, where the method is used for a capacitance detection device, the capacitance detection device includes a capacitance measurement chip, a measurement channel, a reference channel, and a capacitance sensing unit, one end of the measurement channel is connected to the capacitance measurement chip, the other end of the measurement channel is connected to the capacitance sensing unit, one end of the reference channel is connected to the capacitance measurement chip, the other end of the reference channel is placed in a floating state, and a routing of the reference channel is accompanied with a routing of the measurement channel;
the method comprises the following steps:
acquiring a detection capacitance value and a reference capacitance value, wherein the detection capacitance value is a capacitance value detected through a measurement channel, and the reference capacitance value is a capacitance value detected through a reference channel;
acquiring a difference value between the detection capacitance value and a reference capacitance value;
and taking the difference value as a corrected detection capacitance value.
Optionally, after the difference is used as the corrected detection capacitance value, the method further includes:
comparing the corrected detection capacitance value with a preset threshold value;
and judging whether the specified operation is detected or not according to the comparison result.
Optionally, before the difference is used as the corrected detection capacitance value, the method further includes:
the difference is low-pass filtered.
Optionally, the capacitance sensing unit includes a metal sheet.
Optionally, the capacitance detection device is disposed in the earphone, and the metal sheet is disposed inside the earphone shell.
Optionally, the headset is a real wireless stereo TWS headset.
According to a second aspect of the embodiments of the present application, there is provided a capacitance detection apparatus, including a capacitance measurement chip, a measurement channel, a reference channel, and a capacitance sensing unit;
one end of the measuring channel is connected with the capacitance measuring chip, and the other end of the measuring channel is connected with the capacitance sensing unit;
one end of the reference channel is connected with the capacitance measuring chip, the other end of the reference channel is placed in a floating mode, and the routing of the reference channel is accompanied with the routing of the measuring channel;
the capacitance measurement chip is used for:
acquiring a detection capacitance value and a reference capacitance value, wherein the detection capacitance value is a capacitance value detected through a measurement channel, and the reference capacitance value is a capacitance value detected through a reference channel; acquiring a difference value between the detection capacitance value and a reference capacitance value; and taking the difference value as a corrected detection capacitance value.
Optionally, the capacitance measuring chip is further configured to:
and comparing the corrected detection capacitance value with a preset threshold value, and judging whether specified operation is detected according to a comparison result.
Optionally, the apparatus further includes a low-pass filter, and the capacitance measurement chip is further configured to:
and performing low-pass filtering on the difference value through the low-pass filter before the difference value is used as the corrected detection capacitance value.
Optionally, the capacitance sensing unit includes a metal sheet.
Optionally, the capacitance detection device is disposed in the earphone, and the metal sheet is disposed inside the earphone shell.
Optionally, the headset is a real wireless stereo TWS headset.
According to a third aspect of the embodiments of the present application, there is provided an earphone including any one of the capacitance detection devices described above.
Optionally, the headset is a real wireless stereo TWS headset.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
in the scheme of the application, for the capacitance detection device, a reference channel for collecting the drift caused by temperature change is designed besides the measurement channel, one end of the reference channel is placed in a floating mode, and the wiring of the reference channel is accompanied with the wiring of the measurement channel. Because the influence of temperature on the reference channel and the measurement channel is consistent, if the capacitance measurement value drifts due to temperature change, the reference channel and the measurement channel synchronously change and drift simultaneously, but the difference does not change along with the temperature, the two are subtracted, namely the capacitance measurement value of the reference channel is subtracted from the capacitance measurement value of the measurement channel, so that the drift caused by the temperature change can be inhibited, and a more accurate capacitance detection value is obtained, thereby avoiding misjudgment caused by the temperature change, improving the accuracy of capacitance detection, and improving user experience.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise. Furthermore, these descriptions should not be construed as limiting the embodiments, wherein elements having the same reference number designation are identified as similar elements throughout the figures, and the drawings are not to scale unless otherwise specified.
Fig. 1 is a schematic flow chart of a capacitance detection method provided in an embodiment of the present application;
fig. 2 is a schematic diagram of a capacitance detection device according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart diagram of a capacitance detection method provided by an embodiment of the present application;
FIG. 4 is a schematic flow chart diagram of a capacitance detection method provided by an embodiment of the present application;
fig. 5 is a schematic diagram of measured data in an exemplary scenario provided in an embodiment of the present application.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other existing structure and/or functionality in addition to one or more of the aspects set forth herein.
In the following description, specific details are provided to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the present aspects may be practiced without these specific details. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Fig. 1 is a schematic flow chart of a capacitance detection method according to an embodiment of the present application. The capacitance detection method provided by the embodiment of the application can be applied to the fields related to capacitance-touch, such as mobile phones and earphones.
The method is used for a capacitance detection device, and referring to fig. 1, the method may include:
in step S101, a detection capacitance value and a reference capacitance value are obtained, where the detection capacitance value is a capacitance value detected by a measurement channel, and the reference capacitance value is a capacitance value detected by a reference channel.
In step S102, a difference between the detection capacitance value and the reference capacitance value is obtained.
In step S103, the difference is used as a corrected detection capacitance value.
The capacitance detection device can be seen in fig. 2, and the capacitance detection device may include a capacitance measurement chip 201, a measurement channel 202, a reference channel 203, and a capacitance sensing unit 204.
One end of the measuring channel is connected with the capacitance measuring chip, and the other end of the measuring channel is connected with the capacitance sensing unit.
One end of the reference channel is connected with the capacitance measuring chip, the other end of the reference channel is placed in a floating mode, and the routing of the reference channel is accompanied with the routing of the measuring channel.
As an example, the capacitance sensing unit may specifically include a metal sheet.
In one scenario, the capacitance detection device may be arranged in a headset, such as a real wireless stereo TWS headset, and the metal sheet body may be arranged inside the headset housing.
The tail end of the measuring channel can be provided with a metal sheet with a proper area as a capacitance sensing unit and can be generally arranged at a proper position on the inner side of the earphone shell. The metal sheet, the earphone shell and the finger are respectively a conductor, an insulator and a conductor, and when the finger touches the position, the metal sheet, the earphone shell and the finger can form a capacitor.
The size, material, position, etc. of the metal sheet are not limited in this embodiment, and those skilled in the art can select and design the metal sheet according to different requirements/different scenarios, and these choices and designs can be used herein without departing from the spirit and scope of the present application.
The idea of the scheme is that a reference channel is designed besides a measurement channel and is used for collecting the detection drift amount caused by temperature change, and the drift amount can be counteracted by subtracting the measurement value of the reference channel from the measurement value of the measurement channel. This is because although a temperature change causes a drift in the detection values of the reference channel and the measurement channel, the difference therebetween does not change with temperature.
As an example, the other end of the reference channel may be as close as possible to the capacitive sensing element without touching the capacitive sensing element.
For the reference channel, the wiring of the reference channel needs to follow the measurement channel, so that the influence of the temperature on the reference channel and the measurement channel is consistent. The ends of the reference channels are placed in a floating manner, so that finger contact does not cause the capacitance value of the reference channels to change.
Although the reference channel is not connected to the metal sheet to form a capacitor, the internal parasitic capacitance of the capacitance measurement chip, the package wiring parasitic capacitance and the board-level wiring parasitic capacitance together form an intrinsic capacitance of the reference channel, so that a certain capacitance value can be measured through the reference channel.
Referring to fig. 3, in this embodiment or some other embodiments of the present application, after taking the difference as the corrected detected capacitance value, the method further includes:
in step S301, the corrected detection capacitance value is compared with a preset threshold value.
In step S302, it is determined whether or not a specified operation is detected based on the comparison result.
For example, if the difference, i.e. the corrected detected capacitance value, is found to be greater than a preset threshold, it may be determined that the user has touched the earphone, and a response may be made thereto, such as executing a certain corresponding instruction.
The embodiment is not limited to the preset threshold and the designated operation, and those skilled in the art can select and design according to different requirements/different scenarios, and these choices and designs can be used herein without departing from the spirit and scope of the present application.
In addition, because the capacitance acquisition circuit belongs to weak signal acquisition and is easily influenced by aerial noise, in order to improve the accuracy, the difference between the measurement channel and the reference channel can be subjected to low-pass filtering processing, thereby being beneficial to improving the acquisition precision.
Therefore, referring to fig. 4, in this embodiment or some other embodiments of the present application, before the difference is taken as the corrected detection capacitance value, the method may further include:
in step S401, the difference is low-pass filtered.
Fig. 5 is a schematic diagram of measured data provided in the embodiment of the present application, and shows a measured result, that is, raw data, in an exemplary scenario in the embodiment of the present application. The acquisition channel is also called a measurement channel, and the reference channel is also called a reference channel.
In fig. 5, the vertical axis is the ADC quantization result, reflecting the capacitance (but not the capacitance); the horizontal axis represents the number of times of acquisition, which is accumulated as time increases, and therefore the horizontal axis can be regarded as a change in time. In fig. 5, the values of several ordinate axes marked on the vertical axis are 260, 270, 280, 290.... 360 in this order, and the values of several abscissa axes marked on the horizontal axis are 0, 2000, 4000, 6000, 8000..... 14000 in this order, and 8 values in this order.
When the temperature is heated from 30 degrees to 100 degrees, the specific values of the horizontal and vertical coordinates are not changed, and the effect of fig. 5 is to obviously reflect a trend that the detection values of the reference channel and the measurement channel are basically changed synchronously, and the difference value of the two is basically unchanged, so that the difference between the two can inhibit the detection value drift caused by the temperature change.
In this embodiment, for the capacitance detection device, a reference channel for collecting the drift amount caused by the temperature change is designed in addition to the measurement channel, one end of the reference channel is placed in a floating manner, and the trace of the reference channel is accompanied with the trace of the measurement channel. Because the influence of temperature on the reference channel and the measurement channel is consistent, if the capacitance measurement value drifts due to temperature change, the reference channel and the measurement channel synchronously change and drift simultaneously, but the difference does not change along with the temperature, the two are subtracted, namely the capacitance measurement value of the reference channel is subtracted from the capacitance measurement value of the measurement channel, so that the drift caused by the temperature change can be inhibited, and a more accurate capacitance detection value is obtained, thereby avoiding misjudgment caused by the temperature change, improving the accuracy of capacitance detection, and improving user experience.
The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.
Fig. 2 is a schematic diagram of a capacitance detection apparatus according to an embodiment of the present disclosure, and the capacitance detection apparatus in fig. 2 may include a capacitance measurement chip 201, a measurement channel 202, a reference channel 203, and a capacitance sensing unit 204.
The capacitance detection device provided by the embodiment of the application can be applied to the fields related to capacitance-touch, such as mobile phones and earphones.
Referring to fig. 2, the capacitance detection apparatus may include a capacitance measurement chip, a measurement channel, a reference channel, and a capacitance sensing unit:
one end of the measuring channel is connected with the capacitance measuring chip, and the other end of the measuring channel is connected with the capacitance sensing unit;
one end of the reference channel is connected with the capacitance measuring chip, the other end of the reference channel is placed in a floating mode, and the routing of the reference channel is accompanied with the routing of the measuring channel;
the capacitance measurement chip is used for:
acquiring a detection capacitance value and a reference capacitance value, wherein the detection capacitance value is a capacitance value detected through a measurement channel, and the reference capacitance value is a capacitance value detected through a reference channel; acquiring a difference value between the detection capacitance value and a reference capacitance value; and taking the difference value as a corrected detection capacitance value.
As an example, the other end of the reference channel may be as close as possible to the capacitive sensing element without touching the capacitive sensing element.
For the reference channel, the wiring of the reference channel needs to follow the measurement channel, so that the influence of the temperature on the reference channel and the measurement channel is consistent. The ends of the reference channels are placed in a floating manner, so that finger contact does not cause the capacitance value of the reference channels to change.
Although the reference channel is not connected to the capacitance sensing unit to form a capacitor, the internal parasitic capacitance of the capacitance measurement chip, the package connection line parasitic capacitance and the board-level routing parasitic capacitance together form an intrinsic capacitance of the reference channel, so that a certain capacitance value can be measured through the reference channel.
As an example, in this embodiment or some other embodiments of the present application, the capacitance measuring chip may further be configured to:
and comparing the corrected detection capacitance value with a preset threshold value, and judging whether specified operation is detected according to a comparison result.
In this embodiment or some other embodiments of the present application, the apparatus may further include a low-pass filter, and the capacitance measuring chip may further be configured to:
and performing low-pass filtering on the difference value through the low-pass filter before the difference value is used as the corrected detection capacitance value.
In this embodiment or some other embodiments of the present application, the capacitance sensing unit may specifically include a metal sheet.
In this embodiment or some other embodiments of the present application, the capacitance detection device may be specifically disposed in an earphone, and the metal sheet may be disposed inside an earphone shell.
In this embodiment or some other embodiments of the present application, the headset may specifically be a real wireless stereo TWS headset.
Regarding the apparatus in the foregoing embodiments, the specific manner in which each unit \ module executes operations has been described in detail in the embodiments of the related method, and is not described herein again. In the present application, the names of the above units/modules do not limit the units/modules themselves, and in practical implementations, the units/modules may be referred to by other names, so long as the functions of the units/modules are similar to those of the present application, and all of the units/modules belong to the scope of the claims and the equivalent technology of the present application.
In this embodiment, for the capacitance detection device, a reference channel for collecting the drift amount caused by the temperature change is designed in addition to the measurement channel, one end of the reference channel is placed in a floating manner, and the trace of the reference channel is accompanied with the trace of the measurement channel. Because the influence of temperature on the reference channel and the measurement channel is consistent, if the capacitance measurement value drifts due to temperature change, the reference channel and the measurement channel synchronously change and drift simultaneously, but the difference does not change along with the temperature, the two are subtracted, namely the capacitance measurement value of the reference channel is subtracted from the capacitance measurement value of the measurement channel, so that the drift caused by the temperature change can be inhibited, and a more accurate capacitance detection value is obtained, thereby avoiding misjudgment caused by the temperature change, improving the accuracy of capacitance detection, and improving user experience.
The embodiment of the application also provides an earphone which can comprise any one of the capacitance detection devices.
As an example, the headset may be a real wireless stereo TWS headset.
TWS is an abbreviation of True Wireless Stereo, True radio Stereo. The TWS technology is developed on the basis of the Bluetooth technology. The TWS earphone comprises a pair of wireless earphones, one of the wireless earphones is a main earphone, the other wireless earphone is an auxiliary earphone, the mobile phone is connected with the main earphone in a wireless mode, the main earphone is connected with the auxiliary earphone in a wireless mode, and real Bluetooth left and right sound channels are used in a wireless separated mode.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the aspects disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (14)
1. A capacitance detection method is characterized in that the method is used for a capacitance detection device, the capacitance detection device comprises a capacitance measurement chip, a measurement channel, a reference channel and a capacitance sensing unit, one end of the measurement channel is connected with the capacitance measurement chip, the other end of the measurement channel is connected with the capacitance sensing unit, one end of the reference channel is connected with the capacitance measurement chip, the other end of the reference channel is placed in a floating mode, and the routing of the reference channel is accompanied with the routing of the measurement channel;
the method comprises the following steps:
acquiring a detection capacitance value and a reference capacitance value, wherein the detection capacitance value is a capacitance value detected through a measurement channel, and the reference capacitance value is a capacitance value detected through a reference channel;
acquiring a difference value between the detection capacitance value and a reference capacitance value;
and taking the difference value as a corrected detection capacitance value.
2. The method of claim 1, wherein after taking the difference value as the corrected detected capacitance value, the method further comprises:
comparing the corrected detection capacitance value with a preset threshold value;
and judging whether the specified operation is detected or not according to the comparison result.
3. The method of claim 1, wherein before taking the difference value as the corrected detected capacitance value, the method further comprises:
the difference is low-pass filtered.
4. The method of claim 1, wherein the capacitive sensing element comprises a metal sheet.
5. The method of claim 4, wherein the capacitance detection device is disposed within an earphone and the metal sheet is disposed inside an earphone shell.
6. The method of claim 5, wherein the headset is a true wireless stereo TWS headset.
7. A capacitance detection device is characterized by comprising a capacitance measurement chip, a measurement channel, a reference channel and a capacitance sensing unit;
one end of the measuring channel is connected with the capacitance measuring chip, and the other end of the measuring channel is connected with the capacitance sensing unit;
one end of the reference channel is connected with the capacitance measuring chip, the other end of the reference channel is placed in a floating mode, and the routing of the reference channel is accompanied with the routing of the measuring channel;
the capacitance measurement chip is used for:
acquiring a detection capacitance value and a reference capacitance value, wherein the detection capacitance value is a capacitance value detected through a measurement channel, and the reference capacitance value is a capacitance value detected through a reference channel; acquiring a difference value between the detection capacitance value and a reference capacitance value; and taking the difference value as a corrected detection capacitance value.
8. The apparatus of claim 7, wherein the capacitance measurement chip is further configured to:
and comparing the corrected detection capacitance value with a preset threshold value, and judging whether specified operation is detected according to a comparison result.
9. The apparatus of claim 7, further comprising a low pass filter, the capacitance measurement chip further configured to:
and performing low-pass filtering on the difference value through the low-pass filter before the difference value is used as the corrected detection capacitance value.
10. The apparatus of claim 7, wherein the capacitive sensing element comprises a metal sheet.
11. The device of claim 10, wherein the capacitance detection device is disposed within a headset, and the metal sheet is disposed inside a headset housing.
12. The apparatus of claim 11, wherein the headset is a true wireless stereo TWS headset.
13. A headset comprising a capacitance detection device as claimed in any one of claims 7 to 12.
14. The headset of claim 13, wherein the headset is a true wireless stereo TWS headset.
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| CN113703659B (en) * | 2021-09-01 | 2024-06-11 | 恒玄科技(上海)股份有限公司 | State detection method and device, wearable device and readable storage medium |
| CN114401480A (en) * | 2021-12-30 | 2022-04-26 | 歌尔科技有限公司 | Calibration method, device and medium for TWS earphone capacitive sensor |
| CN114401480B (en) * | 2021-12-30 | 2024-04-30 | 歌尔科技有限公司 | Calibration method, device and medium for TWS earphone capacitive sensor |
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