EP2268063A1 - Système et procédé de personnalisation d'un dispositif d'aide auditive - Google Patents

Système et procédé de personnalisation d'un dispositif d'aide auditive Download PDF

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Publication number
EP2268063A1
EP2268063A1 EP09163861A EP09163861A EP2268063A1 EP 2268063 A1 EP2268063 A1 EP 2268063A1 EP 09163861 A EP09163861 A EP 09163861A EP 09163861 A EP09163861 A EP 09163861A EP 2268063 A1 EP2268063 A1 EP 2268063A1
Authority
EP
European Patent Office
Prior art keywords
hearing aid
external auditory
auditory canal
geometric model
computing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09163861A
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German (de)
English (en)
Inventor
Alexander Grafenberg
Andre Steinbuss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sivantos Pte Ltd
Original Assignee
Siemens Medical Instruments Pte Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Medical Instruments Pte Ltd filed Critical Siemens Medical Instruments Pte Ltd
Priority to EP09163861A priority Critical patent/EP2268063A1/fr
Publication of EP2268063A1 publication Critical patent/EP2268063A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/70—Adaptation of deaf aid to hearing loss, e.g. initial electronic fitting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
    • H04R25/658—Manufacture of housing parts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/77—Design aspects, e.g. CAD, of hearing aid tips, moulds or housings
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
    • H04R25/652—Ear tips; Ear moulds

Definitions

  • the present invention relates generally to a system and method for customizing a hearing aid device having at least one microphone.
  • the present system and method relate to hearing aid devices of the types in-the-ear (ITE), in-the-canal (ITC), or completely-in-canal (CIC).
  • ITE in-the-ear
  • ITC in-the-canal
  • CIC completely-in-canal
  • Hearing aids are used for one or both ears in order to compensate for hearing loss in humans.
  • Hearing aids are typically custom-made because most humans have different levels of hearing loss and different structures ear canal, meatus and/or concha.
  • hearing aids may be of several types, including behind-the-ear (BTE), in-the-ear (ITE), in-the-canal (ITC), and completely-in-canal (CIC), among others.
  • BTE behind-the-ear
  • ITE in-the-ear
  • ITC in-the-canal
  • CIC completely-in-canal
  • a hearing aid typically comprises a shell or earmold that snugly fits into a portion of subject's ear and houses electronic and acoustic components.
  • Such components include one or more microphones that receive input acoustic (sound) signals from the environment of the user.
  • the microphones are connected to an amplifying unit arranged within the shell of the hearing aid. This amplifying unit drives a receiver which is acoustically
  • the input acoustic signal spectrum can be distorted by the position of the microphone of the hearing aid device at the head or near the ear, in the auditory canal.
  • the frequency response of the input acoustic signal shows a resonance peak, which may, for example, assume values up to 15 dB, depending on the position of the microphone inside the ear.
  • This acoustic effect is well known, and is known as the Microphone Location Effect (MLE). MLE is less pronounced for devices worn outside the ear, such as behind-the-ear (BTE) devices, where the frequency response of the input signal is comparatively flatter.
  • BTE behind-the-ear
  • MLE is thus a function of the shape/structure of the user's ear and the position of the microphone inside the ear. For a given user, it is desirable to know the individual MLE so that its effect can also be taken into account for the settings of the hearing aid, especially where large individual variances can occur in ITE, ITC, and CIC devices.
  • the measurement of the MLE is however tedious and cannot normally be done by the audiologist who does the adjustments. Therefore, in practice, the average statistical MLE curves are stored in a database.
  • the individual MLE for a user may, for example, be determined based on a look up table, which includes a set of 'n' predefined MLE-shapes as a function of insertion depth of the hearing device's microphone. However, such statistical graphs provide approximate measurements and are hence not accurate for each individual.
  • the object of the present invention is to provide a system and method for customizing a hearing aid device to a user with an improved technique for computing an acoustic frequency response of the input acoustic signal to the hearing aid device.
  • the underlying idea of the present invention is to model the acoustic effects on the input side of a hearing aid device based on a three-dimensional geometric scan data of corresponding to portion of the user's ear. Based on the geometric scan data of the ear, and the position of the microphone of the hearing aid device in the ear, an acoustic frequency response is computed for the input-side acoustic signal. For the audiologist or health care professional who does the customizing of the hearing aid device for different users, this gives rise to an advantage input side acoustic response can be modeled for each individual user with reasonable effort, which can be used for customizing the hearing aid device for the individual user.
  • the proposed method further comprises directly scanning at least a portion of said external auditory canal to obtain said scan data. In an alternate embodiment, the proposed method further comprises scanning an impression of at least a portion of said external auditory canal to obtain said scan data
  • computing said three-dimensional geometric model of said hearing aid shell comprises adapting the shape of the three-dimensional geometric model of the hearing shell to conform to a shape of a portion of the computed three-dimensional geometric model of said external auditory canal.
  • the shape of the hearing aid shell can be customized to ensure proper fitting of the hearing aid shell to the user's external auditory canal to achieve satisfactory wearing comfort, reduction in acoustic feedback and unwanted changes in the electro-acoustic characteristics of the aid.
  • said designated position is an intended microphone location and the computing of said acoustic frequency response comprises computing a microphone location effect.
  • the individual MLE can be advantageously taken into account in the basic setting of the hearing aid device.
  • computing said three-dimensional geometric model of said external auditory canal comprises geometrically measuring a scanned portion corresponding to said external auditory canal and for extrapolating the geometry of the remaining part of said external auditory canal. This eliminates the need for scanning the entire external ear canal of the user which is a cumbersome process.
  • the proposed method further comprises displaying a graphical representation of said acoustic frequency response corresponding to said hearing aid device in-situ said user's ear.
  • the proposed method further comprises storing the acoustic frequency response computed for multiple users in a patient database.
  • the hearing aid device is customized by pre-setting an amplification unit of a hearing aid device based on said computed acoustic frequency response. This embodiment reduces the number of steps in the fine tuning of hearing aid devices that are pre-set with special microphone measurements.
  • the proposed method further comprises storing of said computed acoustic frequency response in said hearing aid device during manufacturing of said hearing aid device.
  • computer program product comprising computer readable media having computer readable program code embodied therein adapted for executing the actions of any of the methods mentioned above.
  • a hearing aid device is provided that is customized by the any of the methods mentioned above.
  • FIG 1 a schematic drawing of a hearing aid device 1, wherein the present invention is applicable, the hearing aid device 1 at least partially inserted into an external auditory canal 2 (also referred to as "ear canal") of a user.
  • the illustrated hearing aid device 1 is of the in-the-ear (ITE) type.
  • ITE in-the-ear
  • ITC in-the-canal
  • CIC completely-in-canal
  • the hearing aid device 1 includes a shell or ear mold 2 that fits into a portion of the external ear canal 2.
  • the hearing aid device 1 is provided with a microphone 4 located on the front side of the hearing aid shell for receiving input acoustic signals from the environment of the user and converting the acoustic signals into electrical signals.
  • the device 1 may be include multiple microphones in order to provide directional information of the sound to the user.
  • the microphone 4 is connected to an amplifying unit 5 arranged within the hearing aid shell 3.
  • the amplifying unit 5 increases the strength of the electrical signal from the microphone 4 and also filters and modifies the response of the hearing aid device 1 to match the hearing loss of the user.
  • a receiver 6 converts the amplified electrical signal from the amplifier unit 5 back into an acoustic signal.
  • An acoustic conduct 7 couples the acoustic output of the receiver 6 to the user's ear canal 2.
  • the present invention may be employed to customize the exemplary hearing aid device 1 by conveniently computing for an individual user, a frequency response of the input acoustic signal incident on the microphone 4 depending on the position of the microphone 4 inside the ear. Using this, the settings of the hearing aid device 1 can be customized for the user as described hereinafter.
  • FIG 2 shows a system for adapting/customizing a hearing aid device to a user according one embodiment of the present invention, which system is designated in entirety by reference numeral 10.
  • the system 10 includes a scanning device 11 which digitizes the shape of a user's external ear canal and a computation device 12 that uses the digitized scan data from the scanning device 11 for computing a three-dimensional geometric model of the user's external ear canal with the hearing aid device in-situ and for subsequently computing an acoustic response of the user's ear with the hearing aid device.
  • the scanning device 11 is adapted for performing a direct three-dimensional scan of the user's external ear canal or a portion thereof.
  • the scanning device 11 may be adapted to perform a three-dimensional scan of an impression of at least a portion of the user's external ear canal.
  • scan data corresponding to the user's external ear canal can be obtained either by direct scan of a portion of the user's external ear canal or by scanning of an impression of a portion the user's external ear canal or by any other suitable means.
  • the scan may be based, for example, on laser triangulation or light based computed tomography or any other known technique.
  • the scanning device 11 may be operated, at the location of a dispenser.
  • dispenser is in this context to be construed as a hearing care professional, such as a medical doctor, audiologist, or a hearing care trained person.
  • the digitized scan data corresponding to the user's external ear canal is communicated to the computation device 12 via communication link 13.
  • the computation device 12 may be present at the location of the dispenser or at the location of manufacturing of the hearing aid device. In the latter case, the communication link 13 may include, for example, a computer network, television network, telecommunication network, or any combination thereof.
  • the computation device 12 comprises processing means 15 and associated input/output (I/O) circuitry 14 for receiving the scan data from the scanning device 11.
  • the processing means 15 may include, for example, a computer, a microcontroller, a field programmable gate array (FPGA), or a general purpose microprocessor, among others.
  • the processing means 15 comprises functional subsystems, namely a geometric modeling subsystem 16 and an acoustic modeling subsystem. These subsystems 16 and 17 may, for example, be implemented by software that is executable by the processing means 15.
  • the geometric modeling subsystem 16 is adapted for reconstructing the digitized scan data 12 and computing a three-dimensional geometric model of the user's external ear canal. Obtaining scan data of the entire external ear canal of a user may be a difficult and cumbersome process. Hence in one embodiment, the geometric modeling subsystem 16 may be adapted for computing the geometry of the entire external ear canal by geometrically measuring a scanned portion of the ear canal of the user and for extrapolating the geometry of the rest part of the external ear canal. This would advantageously eliminate the need for scanning the entire external ear canal.
  • the geometric modeling subsystem 16 is also adapted for computing a three-dimensional geometric model of the shell of the hearing aid device in-situ (i.e., positioned within) the computed geometric model of the user's external ear canal, i.e., a composite three-dimensional geometric model of the hearing aid shell inserted into a portion of the user's external ear canal.
  • Computation of the composite model of the hearing aid shell in-situ the ear canal thus involves computation of the geometric shape of the hearing aid shell as well the position of fit of the hearing aid shell within the ear canal.
  • the position of fit of the hearing aid shell within the ear canal may be computed so as to achieve satisfactory wearing comfort, reduction in acoustic feedback and unwanted changes in the electro-acoustic characteristics of the aid.
  • the shape of the hearing aid shell is adapted to conform to the shape of a portion the user's external ear canal where the hearing device is to be fitted. This makes it possible to customize the shape of the hearing aid shell to ensure proper fitting of the hearing aid shell to the user's external ear canal.
  • the user may select a desired hearing aid product from a list of available hearing aid products contained in a database 18, which is fed to the processing means 15 via I/O circuitry 14.
  • the geometric modeling subsystem 16 is in this case adapted to compute a composite geometric model of the shell of the selected hearing aid product in-situ the user's external ear canal.
  • the digital representation or model of the hearing aid that is computed by the geometric modeling subsystem 16 may be based on a photograph or scan of the hearing aid product or may be based on a computer aided design or manufacturing (CAD/CAM) file of the hearing aid product.
  • CAD/CAM computer aided design or manufacturing
  • a position is designated within this composite three-dimensional model.
  • this designated position is an intended microphone location.
  • the acoustic modeling subsystem 17 then computes an acoustic frequency response of a simulated acoustic signal incident on this position of the microphone within the composite three-dimensional model, taking into account the computed geometry of the user's external ear canal.
  • the numerical computation by the acoustic modeling subsystem 17 may be based on a simulated acoustic signal comprising one or more frequencies propagating against the outer ear.
  • the acoustic modeling subsystem 17 may be adapted, for example, to calculate a sound pressure level for a three-dimensional geometrical element corresponding to the location of the microphone, which may be normalized relative to the input acoustic signal.
  • the acoustic modeling subsystem 17 thus calculates the frequency response of the input acoustic signal, which may include, for example, a graph of sound pressure level plotted as a function of frequency and angle of incidence. From the computed frequency response, the microphone location effect (MLE) be computed by determining resonance peak of the graph.
  • MLE microphone location effect
  • the individual MLE for each microphone can computed as described above.
  • the individual MLE/acoustic frequency response thus computed may be made available in suitable form to hearing aid device customization software.
  • the computed MLE/acoustic frequency response for individual users may be stored in a patient database 18 of the customizing audiologist/ dispenser or of the hearing aid device manufacturer and may also be displayed as a graphical representation to the customizing audiologist/dispenser or manufacturing personnel via display means 20 (such as a monitor).
  • display means 20 such as a monitor.
  • the present invention thus allows the customizing audiologist/dispenser or the hearing aid manufacturer to obtain individual MLEs with reasonable effort, for customizing the hearing device.
  • the simulation curves in the software of the hearing device will then be able to simulate the acoustic transmission of the hearing device with that much more accuracy.
  • the settings of the hearing aid device for example, the amplifying unit, can then be pre-set or adjusted based on the computed MLE/ acoustic frequency response. That is, the location effect of the microphone can be advantageously used to adjust the setting of the amplification unit. For example, the larger the individual MLE is per frequency, the lesser the amplification that needs to be provided by the hearing aid per frequency in order to compensate for the individual hearing loss.
  • the present invention reduces the number of steps in the fine tuning of the device, since the individual MLE is already taken into account in the basic setting of the hearing aid device.
  • FIG 3 is a flowchart illustrating an exemplary method S1 for making a hearing aid device customized to a user.
  • the method S1 begins at step S2, by three-dimensional scanning of at least a portion of a user's external ear canal (or an impression thereof). This may be performed, for example, by a dispenser at a clinic.
  • the digitized scan data is utilized to re-construct a three-dimensional geometric model of the user's external ear canal.
  • Step S3 may include, for example, geometrically measuring a scanned portion corresponding to the external ear canal and for extrapolating the geometry of the remaining part of the external ear canal.
  • a three-dimensional model of the shell of the hearing aid device is computed.
  • the shape of the hearing aid shell is adapted to a shape of a portion the user's external ear canal.
  • the three-dimensional geometric model of the hearing aid shell is computed based on a selected hearing aid product by a user from a list of already available hearing aid products.
  • the position of the hearing aid device inside he user's ear is determined and a composite model is computed of the hearing aid shell positioned within the user's external ear canal. Within this composite model, the a position is designated, which may be, as mentioned earlier, an intended location for a microphone.
  • Step S6 involves computation of an acoustic frequency response of a simulated acoustic signal incident on the position of the microphone taking into account the geometry of the external ear canal.
  • step S6 involves computing a microphone location effect (MLE) corresponding to the position of the microphone in the computed composite model.
  • MLE microphone location effect
  • the computed frequency response/MLE may be stored in a patient database (step S7) and may also be displayed graphically to the audiologist/dispenser (step S8).
  • the computed frequency response is communicated to the manufacturing center, along with the geometric model of the shell computed at step 4.
  • the shell of the hearing device is manufactured at the hearing aid device manufacturing center based on the computed geometric model of the shell, for example, using a direct manufacturing process such as selective-laser sintering, stereo lithography or digital light processing or using rapid prototyping equipment such as dedicated CAD 3D printing machines.
  • Step S11 involves pre-setting or adjusting the settings of the components of the hearing aid device, such as the amplifying unit based on the MLE/acoustic frequency response computed at step S6.
  • method S1 further comprises the step (S12) of storing the individual MLE in the individual hearing aid device during manufacturing process.
  • This embodiment advantageously facilitates readout of individual MLE data for follow up fittings on a site other than where the user's ear was scanned originally.
  • aspects of the above described method may take the form of computer or controller implemented processes and apparatuses for practicing those processes.
  • aspects of the proposed method may also be embodied in the form of computer program code containing instructions embodied in tangible media, such as floppy diskettes, CD-ROMs, hard drives, DVDs, or any other computer-readable storage medium, wherein, when the computer program code is loaded into and executed by a computer or controller, the computer becomes an apparatus for practicing the invention.
  • the techniques described may further be embodied in the form of computer program code or signal, for example, whether stored in a storage medium, loaded into and/or executed by a computer or controller, or transmitted over some transmission medium, such as over electrical wiring or cabling, through fiber optics, or via electromagnetic radiation, wherein, when the computer program code is loaded into and executed by a computer, the computer becomes an apparatus for practicing the invention.
  • the computer program code segments When implemented on a general-purpose microprocessor, the computer program code segments configure the microprocessor to create specific logic circuits.
  • the present invention relates to a system and method for customizing a hearing aid device to a user.
  • the proposed system comprises means for computing a three-dimensional geometric model of an external auditory canal of a user's ear based upon scan data corresponding to at least a portion of said external auditory canal.
  • the proposed system also includes means for computing a three-dimensional geometric model of a hearing aid shell in-situ said computed three-dimensional geometric model of said external auditory canal and for designating a position within said three-dimensional model of said hearing aid shell.
  • the proposed system further comprises means for computing an acoustic frequency response of a simulated acoustic signal incident on said designated position, said acoustic frequency response being computed taking into account said geometric model of said external auditory canal.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Manufacturing & Machinery (AREA)
  • Stereophonic System (AREA)
EP09163861A 2009-06-26 2009-06-26 Système et procédé de personnalisation d'un dispositif d'aide auditive Withdrawn EP2268063A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09163861A EP2268063A1 (fr) 2009-06-26 2009-06-26 Système et procédé de personnalisation d'un dispositif d'aide auditive

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EP09163861A EP2268063A1 (fr) 2009-06-26 2009-06-26 Système et procédé de personnalisation d'un dispositif d'aide auditive

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102421049A (zh) * 2011-09-29 2012-04-18 美特科技(苏州)有限公司 音讯讯号处理系统及其听力曲线调整单元
EP2919486A1 (fr) * 2014-03-13 2015-09-16 Oticon A/s Procédé de production de raccords d'aide auditive
EP3149959A4 (fr) * 2014-05-30 2017-12-13 Revol Technologies Inc. Insert auriculaire personnalisable
US10250964B2 (en) 2017-05-10 2019-04-02 Logitech Europe S.A. Apparatus and method of forming a custom earpiece
US10869115B2 (en) 2018-01-03 2020-12-15 Logitech Europe S.A. Apparatus and method of forming a custom earpiece
US11595754B1 (en) * 2019-05-30 2023-02-28 Apple Inc. Personalized headphone EQ based on headphone properties and user geometry

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1246506A1 (fr) * 2001-03-26 2002-10-02 Widex A/S Système CAD-CAM pour préparer une prothèse auditive
US20060233384A1 (en) * 2005-04-13 2006-10-19 Phonak Ag Method of manufacturing an individually shaped hearing device or hearing aid
EP1729231A1 (fr) * 2005-06-01 2006-12-06 Oticon A/S Dispositif et procédé pour l'adaptation d'une prothèse auditive
WO2006136615A2 (fr) * 2006-08-03 2006-12-28 Phonak Ag Procede de reglage d'un instrument auditif
US20070147642A1 (en) * 2005-12-22 2007-06-28 Siemens Audiologische Technik Gmbh Method for constructing an otoplastic and calibrating a hearing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1246506A1 (fr) * 2001-03-26 2002-10-02 Widex A/S Système CAD-CAM pour préparer une prothèse auditive
US20060233384A1 (en) * 2005-04-13 2006-10-19 Phonak Ag Method of manufacturing an individually shaped hearing device or hearing aid
EP1729231A1 (fr) * 2005-06-01 2006-12-06 Oticon A/S Dispositif et procédé pour l'adaptation d'une prothèse auditive
US20070147642A1 (en) * 2005-12-22 2007-06-28 Siemens Audiologische Technik Gmbh Method for constructing an otoplastic and calibrating a hearing device
WO2006136615A2 (fr) * 2006-08-03 2006-12-28 Phonak Ag Procede de reglage d'un instrument auditif

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102421049A (zh) * 2011-09-29 2012-04-18 美特科技(苏州)有限公司 音讯讯号处理系统及其听力曲线调整单元
CN102421049B (zh) * 2011-09-29 2014-06-04 美特科技(苏州)有限公司 音讯讯号处理系统及其听力曲线调整单元
EP2919486A1 (fr) * 2014-03-13 2015-09-16 Oticon A/s Procédé de production de raccords d'aide auditive
EP3149959A4 (fr) * 2014-05-30 2017-12-13 Revol Technologies Inc. Insert auriculaire personnalisable
US10251789B2 (en) 2014-05-30 2019-04-09 Logitech Canada, Inc. Customizable ear insert
US11375326B2 (en) 2014-05-30 2022-06-28 Logitech Canada, Inc. Customizable ear insert
US10250964B2 (en) 2017-05-10 2019-04-02 Logitech Europe S.A. Apparatus and method of forming a custom earpiece
US10869115B2 (en) 2018-01-03 2020-12-15 Logitech Europe S.A. Apparatus and method of forming a custom earpiece
US11595754B1 (en) * 2019-05-30 2023-02-28 Apple Inc. Personalized headphone EQ based on headphone properties and user geometry

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