CN111885446A - Earphone, electronic equipment and earphone in-ear detection method - Google Patents
Earphone, electronic equipment and earphone in-ear detection method Download PDFInfo
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- CN111885446A CN111885446A CN202010654249.XA CN202010654249A CN111885446A CN 111885446 A CN111885446 A CN 111885446A CN 202010654249 A CN202010654249 A CN 202010654249A CN 111885446 A CN111885446 A CN 111885446A
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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
- H04R1/1016—Earpieces of the intra-aural type
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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
- H04R1/1091—Details not provided for in groups H04R1/1008 - H04R1/1083
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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
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
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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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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Headphones And Earphones (AREA)
Abstract
The invention provides an earphone, an electronic device and an earphone in-ear detection method, wherein the earphone comprises a reference magnetic field; magnetic induction means for detecting the reference magnetic field; the sensing component is suitable for being driven by a preset physical signal to generate a state change, and when the state of the sensing component is changed, the sensing component is suitable for enabling the reference magnetic field to be changed accordingly.
Description
Technical Field
The invention relates to the field of MEMS, in particular to an earphone, electronic equipment and an earphone in-ear detection method.
Background
The in-ear detection is gradually a standard configuration function of the TWS headset, which can bring a plurality of humanized use experiences to users, and the function can also effectively save electric quantity and increase the use time of the headset.
Existing in-ear detection schemes include:
1. the optical in-ear detection is represented by apple Air Pods series earphones, and has a complex structure and a relatively large volume. Optical in-ear detection needs to influence practical performances such as earphone waterproofing and dust prevention from a light path channel of an earphone shell hole, the space in an earphone shell is generally narrow, the optical detection structure is relatively complex, the production process is high, and the cost is also high.
2. Capacitance/touch control/pressure control enters ear to detect, and compared with optical non-contact scheme, needs corresponding mechanical structure to carry out the conduction of power and contact, and present scheme of this type main problem lies in, single one-dimensional detection route, and it is easy more to miss trigger, and the reliability is not high.
Disclosure of Invention
In view of the above-mentioned deficiencies in the prior art, the present invention provides a headset comprising:
a reference magnetic field;
magnetic induction means for detecting the reference magnetic field;
the sensing component is suitable for being driven by a preset physical signal to generate a state change, and when the state of the sensing component is changed, the sensing component is suitable for enabling the reference magnetic field to be changed accordingly.
Further, the induction member comprises a magnetic material, the reference magnetic field being defined by the induction member.
Further, the earphone includes an in-ear assembly that can transmit external pressure to the sensing member when the in-ear assembly is subjected to the external pressure.
Further, the headset comprises an in-ear assembly, the sensing means being the in-ear assembly itself or part of the in-ear assembly.
Further, the reference magnetic field is defined by an electrical signal within the earpiece.
Further, the induction component is made of a magnetic collector material.
Further, the sensing member is a magnetic diaphragm member, a magnetic tuning fork member or a magnetic comb member, so that the reference magnetic field can be changed by the sensed acoustic wave.
Further, the magnetic induction device is a three-axis magnetometer.
The invention also provides electronic equipment which comprises the earphone.
The invention also provides an earphone in-ear detection method, which is based on the influence on an induction component arranged in the earphone when the earphone is in the ear, wherein the induction component is set to change the existing magnetic field in the earphone based on the influence, and whether the earphone is in the ear is judged according to the change of the existing magnetic field.
The invention has the following technical effects:
1. aiming at the defects of optical in-ear detection, the magnetic field detection scheme is simple in overall structure, holes do not need to be formed in the shell, and structural design and process complexity are greatly reduced.
2. Aiming at the capacitive/touch/voltage-controlled contact in-ear detection scheme, the magnetic field detection scheme is more convenient and flexible and has high sensitivity. Through the three-dimensional magnetic field sensor, the single-dimensional contact detection can be more accurately identified compared with the traditional single-dimensional contact detection, and the false triggering is avoided.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic block diagram of one embodiment of the present invention;
FIG. 2 is a schematic view of FIG. 1, partially in section;
FIG. 3 is a schematic diagram of another implementation of the earplug assembly of FIG. 1;
FIG. 4 is a schematic view of FIG. 3, partially in section;
FIG. 5 is a schematic diagram of another implementation of the earplug assembly of FIG. 2;
FIG. 6 is a schematic view showing the internal structure of a second embodiment of the present invention;
FIG. 7 is a schematic view of the internal structure of FIG. 6 from a bottom perspective;
FIG. 8 is a schematic view showing the internal structure of a third embodiment of the present invention;
FIG. 9 is a schematic view showing the internal structure of a fourth embodiment of the present invention;
FIG. 10 is a schematic illustration of magnetic field calculation in an embodiment of the invention;
FIG. 11 is a data plot based on one particular experiment of the present invention.
Detailed Description
In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the invention. The drawings are schematic diagrams or conceptual diagrams, and the relationship between the thickness and the width of each part, the proportional relationship between the parts and the like are not completely consistent with actual values.
Example one
Fig. 1 and 2 are schematic structural views of an embodiment of the present invention, in which a headset 100 includes a headset body 110 and an earbud assembly 120.
An earbud assembly 120 is attached to the earpiece body 110, the earbud assembly 120 being disposed within the ear canal of a user when the user is wearing the earpiece 100. In this embodiment, the earplug assembly 120 is detachably connected to the earphone body 110, and the earplug assembly 120 is fixedly connected to the earphone body 110 in other embodiments.
The earplug assembly 120 has flexibility, and when placed in the ear canal of a user, the earplug assembly 120 is compressed by the ear canal, thereby generating deformation. The earplug assembly 120 is magnetic and includes magnetic material, for example, the magnetic material may include metal oxide or alloy including nickel (Ni), iron (Fe), cobalt (Co), manganese (Mn), etc. The magnetic field defined by the earbud assembly 120 when it is in its normal state (not in the ear or uncompressed) will be different from the magnetic field defined by the earbud assembly 120 when it enters the ear canal, and depending on the degree to which it is compressed, the change in magnetic field before and after insertion into the ear will vary significantly.
As shown in fig. 2, a magnetometer 111 is further disposed in the headset main body 110, and the magnetometer 111 is used for sensing a magnetic field of the current position. When the magnetometer 111 is located at a suitable distance from the ear plug assembly 120, the sensed magnetic field signal mainly originates from the ear plug assembly 120 with magnetism, so that according to the magnetic field and the change of the magnetic field detected by the magnetometer 111, it can be determined whether the ear plug assembly 120 is in the ear, which is equivalent to determining whether the ear plug 100 is worn by the user. The position arrangement of the magnetometer 111 shown in fig. 2 is only exemplary, and the position of the magnetometer 111 can be adjusted according to actual situations, and theoretically, the magnetometer 111 can be fixed at any position in the headset main body 110 by using a suitable manner (such as a suitable mechanical structure, adhesion, welding, and the like), and how to fix the magnetometer 111 is not a key point of the present invention, and is also easy to implement by those skilled in the art, and details thereof are not described herein.
In some embodiments, the earplug assembly 120 is made of a flexible magnetic material, such as rubber or silicone material doped or mixed with magnetic powder. By detecting the magnetic field defined by the earplug assembly 120 as a whole, it is determined whether the earplug assembly 120 is inserted into the ear.
In some embodiments, portions of the earplug assembly 120 are magnetic material, such as by doping or coating portions of the earplug assembly 120 with magnetic powder, as shown in fig. 3 and 4, the earplug assembly 120 has a region A, B, C, D of magnetic material. Whether the earbud assembly 120 is in the ear is determined by detecting a magnetic field locally confined by the earbud assembly 120. The magnetic material region A, B, C, D is merely an example of a magnetic powder covered region, and the number of specific sections is not limited herein, nor is the combination of different sections.
In some embodiments, as shown in fig. 5, the earbud assembly 120 includes a magnetic loop 121 having flexibility, and other portions of the earbud assembly 120 other than the magnetic loop 121 are not magnetic. When the earplug assembly 120 is placed in the ear canal, the magnetic ring 121 is also forced to deform, so that whether the earplug assembly 120 is inserted into the ear can be determined by detecting the magnetic field defined by the magnetic ring 121.
Example two
Fig. 6 and 7 are schematic structural views of another embodiment of the present invention, in which the headset 200 includes a housing 210, a PCB board 220, a transmission member 230, a magnetic member 240, and a magnetometer 250.
The PCB board 220 is fixedly disposed within the housing 210, and the magnetic member 240 and the magnetometer 250 are fixed on the PCB board 220. The transmission component 230 includes a transmission bar 231 and a transmission bar 232, and the material and structure of the transmission bar 231 and the transmission bar 232 are the same.
In this embodiment, the magnetic member 240 is disposed in the housing 110 near the upper portion of the earphone 100, and the driving bar 231 and the driving bar 232 are symmetrically disposed at both sides of the magnetic member 240. One end of the driving bar 231 is fixed to the inner side of the housing 210, and the other end is connected with the magnetic circuit of the magnetic member 240; one end of the driving bar 232 is also fixed to the other side of the inner side of the housing 210 symmetrically to the driving bar 231, and the other end is also magnetically connected to the magnetic member 240.
The connection of the driver blade 231 and the driver blade 232 to the housing 210 defines a sensing position 211 and a sensing position 212, the sensing position 211 and the sensing position 212 are adapted such that when the earphone 110 is worn, the sensing position 211 and the sensing position 212 are located in the ear canal of the wearer and contact the wall of the ear canal, and the outer wall of the earphone at the sensing position 211 and the sensing position 212 is deformed by an amount such that the driver blade 231 and the driver blade 232 can be brought closer to the magnetic member 240 by a pressing force when the earphone is placed in the ear canal.
The transmission part 230 and the magnetic member 240 are made of magnetic materials, for example, the magnetic materials may include an alloy containing a metal selected from nickel (Ni), iron (Fe), cobalt (Co), manganese (Mn), and the like.
When the earphone 200 is worn by a user, the sensing position 211 and the sensing position 212 are disposed in the ear canal of the user, and the sensing position 211 and the sensing position 212 are pressed by the ear canal to deform, so that the driving strip 231 and the driving strip 232 approach the magnetic member 240 by the pressing force, and the magnetic field around the magnetic member 240 is changed.
The magnetometer 250 is used to sense the magnetic field of its current location. The magnetometer 250 is disposed at a position close to the magnetic member 240, so that the sensed magnetic field signal is mainly derived from the magnetic member 240, and it is determined whether the earphone 200 is worn by the user according to the magnetic field detected by the magnetometer 250 and the change of the magnetic field, that is, whether the sensing position 211 and the sensing position 212 are in the ear canal.
In the present embodiment, the magnetic member 240 is fixed to the PCB board 220 by a connector 241. In other embodiments, the magnetic member 240 may also be fixed in the earphone 200 by other mechanical structures, for example, a bracket with one end fixed to the housing 210 and the other end connected to the magnetic member 240 is adopted, for example, brackets respectively disposed on both sides of the magnetic member and connected to the housing 210 are provided with slots respectively matching with the magnetic member 240, both ends of the magnetic member 240 are respectively disposed in the slots, the slots are tightly fitted with the magnetic member 240, or the magnetic member 240 and the bracket are directly connected by a connector; or the magnetic member 240 is integrally formed with the bracket.
In the present embodiment, the magnetic member 240 is shaped as a rectangular sheet. In other embodiments, the magnetic member 240 is shaped as an H-shape, U-shape, M-shape, X-shape, etc. to generate a more obvious or characteristic magnetic field change under the interaction with the transmission part 230, so that the magnetic field change defined by the magnetic member 240 is more obvious before and after the headset 200 is worn, and is easily distinguished by the detection signal of the magnetometer 250.
In another embodiment, the magnetic member 240 is replaced by a magnetic collector material, and the magnetometer 250 detects a non-self magnetic field collected by the magnetic collector material, and the non-self magnetic field collected by the magnetic collector material under the action of the transmission member 230 changes accordingly, so as to determine whether the headset is worn or not by detecting the change of the magnetic field, wherein the non-self magnetic field may be a magnetic field defined by an electric signal from inside the headset.
EXAMPLE III
Fig. 8 is a schematic structural diagram of another embodiment of the present invention, wherein the earphone 300 comprises an earphone body 310, and an acoustic member 311 and a magnetometer 312 are disposed in the earphone body 310.
The acoustic member 311 is used to sense a sound field, and may employ, for example, a magnetic diaphragm structure, a magnetic tuning fork structure, or a magnetic comb structure. The magnetic diaphragm structure can be manufactured by adopting a diaphragm forming process in an MEMS microphone process; the magnetic tuning fork structure can be manufactured by adopting a tuning fork forming process in a resonant accelerometer or a gyroscope; the magnetic comb tooth structure can be manufactured by adopting a comb tooth forming process in the capacitive gyroscope.
The thin film constituting the acoustic member 311 contains a magnetic material, and the magnetic material may include an alloy containing a metal selected from nickel (Ni), iron (Fe), cobalt (Co), manganese (Mn), and the like, specifically, CoFeB, CoB, and FeB thin films. The thin film of the acoustic member 311 may be a single-layer magnetic thin film or a composite thin film of a magnetic thin film and a dielectric thin film (silicon oxide and/or silicon nitride).
The magnetometer 312 is used for sensing the corresponding magnetic field variation of the acoustic member 311 caused by the sound field, and specifically, for detecting the magnetic field variation caused by the low-frequency ear-entering action. When the output signal of the magnetometer 312 meets the magnetic field variation caused by the low-frequency band in-ear motion, the headset 300 can be considered to be worn by the user.
Example four
Fig. 9 is a schematic structural view of another embodiment of the present invention, in which a headset 400 includes a housing 410, a PCB board 420, a magnetic collector and/or coil 430, and a magnetometer 440.
The PCB board 420 is fixedly disposed within the housing 410, and the magnetic collector and/or coil 430 and magnetometer 440 are fixed to the PCB board 420.
The magnetic collector and/or coil 430 is configured to collect non-self electromagnetic fields defined by electromagnetic signals generated by various electronic components of the headset 400 under the combined action of the speaker, vibration motor, etc., and the magnetometer 312 is configured to induce a change in the electromagnetic field generated by the electromagnetic components of the headset 400 caused by the low-frequency band insertion during insertion of the headset 400 into the ear, the change being reflected by the change in the non-self magnetic field collected by the magnetic collector and/or coil 430. Magnetometer 312 can determine whether headset 400 is worn by the user by detecting changes in the non-self electromagnetic field concentrated by the magnetic collector and/or coil 430.
For each embodiment, the magnetometer preferably adopts a three-axis magnetometer, and the wearing condition of the headset can be more accurately reflected through the 3D magnetic field, so that the probability of misoperation is reduced.
The processing and utilization of the output signal of the magnetometer may be realized by dedicated circuitry within the headset or/and by the processor. When the earphone is connected to or used as a component of an electronic device, such as an audio playing device, a mobile phone, an AR device, a VR device, etc., the processing and utilization of the output signal of the magnetometer can be completed by a processor in the electronic device, and the specific manner of the processing is not limited herein.
In some embodiments, the headset is also provided with an IMU (inertial measurement unit) for detecting attitude information of the headset (or the earplug), and the in-ear process of the earplug can be reflected more accurately according to the magnetic field change detected by the magnetometer and the related attitude information.
Some optimizations to the above embodiments further include configuring the drive bars 231 and 232 as cylindrical shaped magnets in embodiment two for magnetic field analysis calculations; it is also possible to approximate the unit magnetic elements in the magnetic material region A, B, C, D in the first embodiment to be cylindrical magnets for engineering simplification, and the magnetic field measured by the magnetometer triads is the superposition of the unit magnetic element set deformation in space, as shown in fig. 10.
And calculating the micro-magnetic elements which form the distribution with the density of rho m of the cylindrical magnet by adopting a scalar magnetic potential differential equation set according to a magnetic charge calculation model.
The magnetic scalar at the coordinates P (ρ, Φ, h) of the space where the magnetometers 111, 250 and 312 are located in the above embodiments is:
where M is the magnetization of the magnetic material (permanent magnet), S is the cylinder outer surface, R is the distance from the magnetic field source point to point P, n is the magnet outer surface normal unit vector,
is the divergence factor. Then, the magnetic field strength at P (ρ, Φ, h):
the bound magnetic charge areal density and bound magnetic charge bulk density are respectively recorded as:
ρsmM.N and
the cylindrical magnet is approximately an axially uniformly magnetized cylinder, so that M ═ Br/μ 0 is a constant, where the permeability μ in vacuum is0＝4π×107H/m, then ρ m is 0, the cylinder has only surface magnetic charges of the upper and lower surfaces, and the bulk magnetic charge is zero, and then the formula (1) is simplified as:
substituting the formula (3) into the formula (2) to obtain the magnetic field intensity at P (rho, phi, h) as follows:
then, the total magnetic induction at P (ρ, φ, h) is:
B(ρ,φ,h)＝uH(ρ,φ,h)
the magnetic field calculation analysis can be verified by the magnetic field data measured at the position (rho, h) where the magnetometer is located during the ear insertion process of the embodiment. Fig. 11 is a graph of data measured by a magnetometer in an actual experiment, in which a rubber earplug is used, a part of the earplug is doped with neodymium iron boron magnet powder, the earplug is held in and out of an ear canal, and a change of a magnetic field is detected by the magnetometer. From the data in the graph, it can be seen that the detected data of the magnetometer are significantly different between the ear plug inside the ear and the ear plug outside the ear, so that it can be determined whether the ear plug is in the ear canal or whether the earphone is worn by the user.
For the earphone for detecting the earphone in the ear by using the scheme of the embodiment, the program flow in use is as follows:
step 1: starting;
step 2: initializing the magnetometer, and removing zero point and drift;
step 3: reading factory calibration data, and calculating 3D magnetic field information (left and right ears) and IMU attitude information (left and right ears) before entering ears;
step 4: judging whether user personalized configuration data exist or not, if not, entering a personalized configuration process Step5 used for the first time by the user, and if so, entering a normal use process Step 6;
step 5: starting a personalized configuration process for the first use of a user;
step5.1: the prompting sound informs a user that the left earphone is normally inserted into the ear and the horizontal posture is kept to follow the head, the right earphone is held by the hand to start inserting into the ear for contact, and data sets are collected in sequence until the whole inserting process is finished, and the data set of the whole inserting process is stored.
Step5.2: the prompting sound informs a user that the right earphone is normally inserted into the ear and the horizontal posture is kept to follow the head, the left earphone is held by the hand to start inserting into the ear for contact, and data sets are collected in sequence until the whole inserting process is finished, and the whole data set in the left ear process is stored.
Step5.3: calculating a characteristic value sequence of the in-ear data sets of the left earphone and the right earphone;
step 6: acquiring a normally used real-time in-ear data sequence of the left ear and the right ear, matching according to the existing in-ear data set characteristic value sequence, and calculating an in-ear state;
step 7: judging the program flow according to the in-ear state, and finishing the whole in-ear detection flow if the in-ear task is finished; otherwise, jumping to Step6 to collect normal again according to the task flow.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. An earphone, comprising:
a reference magnetic field;
magnetic induction means for detecting the reference magnetic field;
the sensing component is suitable for being driven by a preset physical signal to generate a state change, and when the state of the sensing component is changed, the sensing component is suitable for enabling the reference magnetic field to be changed accordingly.
2. The headset of claim 1, wherein the inductive member comprises a magnetic material, the reference magnetic field being defined by the inductive member.
3. The headset of claim 2, further comprising an in-ear assembly that transmits external pressure to the sensing member when the in-ear assembly is subjected to the external pressure.
4. The headset of claim 2, further comprising an in-ear assembly, wherein the sensing member is the in-ear assembly itself or a part of the in-ear assembly.
5. The headset of claim 1, wherein the reference magnetic field is defined by an electrical signal within the headset.
6. The headset of claim 5, wherein the inductive member is a magnetic collector material.
7. The earphone according to claim 2, wherein the induction member is a magnetic diaphragm member, a magnetic tuning fork member, or a magnetic comb member, so that the reference magnetic field can be changed by an induced acoustic wave.
8. The headset of claim 1, wherein the magnetic induction device is a three axis magnetometer.
9. An electronic device, characterized in that it comprises a headset according to any of claims 1-8.
10. An earphone in-ear detection method is characterized in that based on the influence of an earphone in-ear on an induction component arranged in the earphone, the induction component is set to change the existing magnetic field in the earphone based on the influence, and whether the earphone is in-ear is judged according to the change of the existing magnetic field.
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| WO2022116274A1 (en) * | 2020-12-01 | 2022-06-09 | 歌尔股份有限公司 | Electronic device, wireless earphone, and in-place detection method for wireless earphone |
| CN113259806A (en) * | 2021-05-13 | 2021-08-13 | 江苏紫米电子技术有限公司 | State detection earphone and control method thereof |
| CN113342301A (en) * | 2021-05-18 | 2021-09-03 | 安克创新科技股份有限公司 | Audio playing method and wearable device |
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| CN111885446B (en) | 2022-09-27 |
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