EP3975583B1 - In-ear-kopfhörer - Google Patents

In-ear-kopfhörer Download PDF

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Publication number
EP3975583B1
EP3975583B1 EP21198881.1A EP21198881A EP3975583B1 EP 3975583 B1 EP3975583 B1 EP 3975583B1 EP 21198881 A EP21198881 A EP 21198881A EP 3975583 B1 EP3975583 B1 EP 3975583B1
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EP
European Patent Office
Prior art keywords
signal
filter
ear
secondary path
earphone
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Active
Application number
EP21198881.1A
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English (en)
French (fr)
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EP3975583A1 (de
Inventor
Vu Hoang Co Thuy
Artur ZORZO
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Devialet SA
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Devialet SA
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Publication of EP3975583A1 publication Critical patent/EP3975583A1/de
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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
    • H04R1/1083—Reduction of ambient noise
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G10K11/17815—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the reference signals and the error signals, i.e. primary path
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G10K11/17817—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the error signals, i.e. secondary path
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
    • 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
    • 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
    • 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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
    • G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3028—Filtering, e.g. Kalman filters or special analogue or digital filters
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/05—Electronic compensation of the occlusion effect
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/15—Determination of the acoustic seal of ear moulds or ear tips of hearing devices

Definitions

  • the present invention relates to an in-ear earphone of the type comprising, in an anatomical case, an electro-acoustic transducer capable of diffusing sound into an auditory canal, a control unit of the electro-acoustic transducer capable of receiving a signal to be reproduced comprising a equalization filter applied to the signal to be reproduced, which unit is connected to an internal microphone of the earphone arranged to measure an audio signal in the auditory canal, the unit further comprising means for continuously estimating a path secondary acoustic defined between the transducer and the internal microphone and means for continuously defining and applying the equalization filter according to the estimation of the secondary acoustic path.
  • the in-ear earphone has an anatomical shape allowing it to be inserted into the ear canal. It defines a small, essentially enclosed volume of air between the earpiece and the eardrum, which makes it possible to generate sound in relatively low frequencies down to 5 Hz.
  • the object of the invention is to propose a solution allowing better correction of the audio signal to take into account the lack of sealing between the in-ear earphone and the auditory canal.
  • the subject of the invention is an in-ear earphone of the aforementioned type, characterized in that it comprises an external microphone arranged to measure a sound signal outside the auditory canal, and the means for estimating the secondary path are specific in estimating the acoustic secondary path as a function also of the sound signal outside the auditory canal measured by the external microphone.
  • a dotted line shows part of a face 8.
  • An intra-auricular earpiece 10 is engaged in the auditory canal denoted 12 of the ear.
  • the user has a pair of headphones symmetrical to each other and wears them in both ears. Only one will be described here.
  • the in-ear earphone 10 comprises, as known per se, an anatomical housing 14 having a slightly frustoconical shape suitable for fitting as tightly as possible into the auditory canal 12.
  • the earphone comprises means 22 for receiving an audio signal to be reproduced from a broadcasting means, such as a mobile phone 24. Communication between the mobile phone and the receiver 22 of the in-ear earphone is ensured, for example, via Bluetooth.
  • the control unit 20 further comprises a computer 26 suitable for performing the computer processing described below and means 28 for amplifying the excitation signal of the transducer 18.
  • the amplifier 28 has its output connected to the transducer 18.
  • the computer 26 is also connected to a first internal microphone 30 arranged on the external surface of the case placed in the auditory canal 12. This microphone is suitable for measuring the acoustic wave in the auditory canal and more precisely applied to the eardrum.
  • the box 14 comprises, on its surface outside the auditory canal 12, an external microphone 32 also connected to the computer 26 and capable of measuring the sound signal outside the auditory cavity and corresponding to the ambient noise.
  • FIG. 2 there are schematically the electro-acoustic transducer 18 and the internal microphone 30. Between these is defined a secondary acoustic path 50 commonly referred to as "secondary path" in English.
  • the secondary path designates the sound flow emitted by the transducer 18 and received by the eardrum and it is in practice measured by the microphone 30 whose measurement is assumed to be representative of the measurement on the eardrum.
  • the primary path designates the sound flow received from outside the earphone by the eardrum and corresponds to the surrounding noises.
  • the receiver 22 is monitored at the output by an equalization filter 52 with variable parameters implemented in the computer 26.
  • the filter is for example a Shelving filter or stepped filter in French.
  • the equalization filter 52 is an infinite (IIR) or finite (FIR) impulse response filter, a cascade of filters or any other filter.
  • the output of the filter 52 for the signal to be reproduced thus equalized is connected to the amplifier 28 through a digital/analog converter 54.
  • the earpiece further comprises, implemented in the computer 26, means 60 for continuously estimating the secondary path 50 associated with means 62 for continuously defining and applying the parameters of the equalization filter 52.
  • the estimation means 60 comprise a model 70 of the transfer function of the secondary path 50.
  • This model 70 receives as input the equalized signal to be reproduced coming from the equalization filter 52.
  • the output signal of the model 70 is subtracted, in a subtractor 72, from a composite signal originating in particular from the internal microphone 30.
  • the analog signal at the output of the internal microphone 30 is routed through an analog/digital converter 86 whose output is connected to the input of the subtractor 72 with the interposition of a subtractor 88.
  • the negative input of the subtractor is connected to the external microphone 32 successively through an analog/digital converter 89 then a module 90 for modeling the passive attenuation resulting from the structure of the earphone.
  • a switch 92 controlled by the control unit 20 is interposed between the module 90 and the subtractor 88.
  • the module 90 is suitable for applying to the digitized signal corresponding to the external sound flow, a filter corresponding to the attenuation due to the structure of the earphone so that the output signal from the module 90 is representative of the sound flow in the auditory canal in presence of the earpiece and resulting solely from the external sound flow.
  • the attenuation function of the filter is experimentally measured on the earphone and stored in memory.
  • the output of the subtractor 72 is connected to an input of an evaluation unit 100 which receives, on another input, the equalized signal coming from the output of the filter 52.
  • the evaluation unit 100 is able to implement a least squares algorithm and is linked to the model 70 to ensure its regulation according to a suitable optimization algorithm. Thus, unit 100 forms a model 70 control loop.
  • the means 62 for defining the parameters of the filter include means 120 for continuously calculating the parameters of the filter 52 and in particular the gain denoted G, the cut-off frequency denoted Fc and the quality factor denoted Q.
  • the means 60 for estimating the secondary path from the information received from the equalized signal to be reproduced and from the two microphones 30, 32, generate the impulse response of the secondary path 50.
  • a fast Fourier transform is applied to the impulse response obtained by model 70.
  • a calculation of the energy of the frequency signal in a range of low frequencies is carried out in step 214.
  • the range of low frequencies is for example from 50 to 200 Hertz.
  • a calculation of the frequency signal energy in a range of median frequencies, chosen outside the range of frequencies where the sound is impacted by a possible leak, is performed during this same step 214.
  • the range of median frequencies is for example 300 to 500 Hz.
  • the calculated energies are smoothed over time to make them more stable with respect to external noises, due to their variations as a function of time.
  • an energy factor EF is continuously defined at step 218. It is equal to the quotient of the energy of the frequency signal in the low frequency range over the energy of the frequency signal in the mid-frequency range.
  • the means 60 produce an error signal, intended to produce a confidence score SNE as explained below.
  • the error signal corresponds to the signal obtained at the output of the subtractor 72 and is equal to the difference on the one hand of the equalized signal to be reproduced to which the transfer function of the secondary path modeled by the module 70 has been applied and on the other hand of the digitized signal from the internal microphone 30 corrected for the digitized signal measured by the external microphone 32 and filtered to take account of the attenuation of the structure of the earpiece.
  • the error signal and the equalized signal to be reproduced coming from the filter 52 are filtered in a range of median frequencies, for example from 50 to 750 Hz. They are then smoothed at step 314.
  • the confidence score SNE is calculated at step 316. It is equal to the quotient of the amplitude of the equalized signal to be reproduced filtered and smoothed by the amplitude of the error signal filtered and smoothed.
  • Step 400 consists of defining and applying the parameters of the filter from the energy factor EF and the confidence score SNE.
  • These parameters are each calculated as a function of the energy factor EF obtained in step 218 from a predefined polynomial function, provided that the confidence score SNE is greater than a predetermined threshold. If this confidence score SNE is greater than the predetermined threshold, the new filter parameters are applied to the filter 52 and the algorithm is implemented again. Otherwise, the algorithm is implemented again without modifying the parameters.
  • the switch 72 is kept closed under the control of the control unit 20.
  • the latter ensures the temporary opening of this switch only as long as the energy factor EF is lower. at a predetermined threshold.
  • the sound signal corresponding to the external flow measured by the external microphone 32 is then not taken into account during periods when the level of leakage is too high.
  • the filter is permanently adapted in an improved manner to any leaks that may occur around the earpiece.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Headphones And Earphones (AREA)
  • User Interface Of Digital Computer (AREA)

Claims (9)

  1. In-Ear-Kopfhörer (10), umfassend, in einem anatomischen Gehäuse (14) einen elektroakustischen Wandler (18), der geeignet ist, um einen Ton in einem Gehörgang (12) zu verteilen, eine Einheit (20) zum Steuern des elektroakustischen Wandlers (18), die geeignet ist, um ein wiederzugebendes Signal zu empfangen, umfassend einen Entzerrungsfilter (52), der auf das wiederzugebende Signal angewandt wird, wobei die Einheit (20) mit einem internen Mikrofon (30) des Ohrhörers verbunden ist, das angeordnet ist, um ein Audiosignal in dem Gehörgang (12) zu messen, die Einheit (20) ferner umfassend Einrichtungen (60) zum kontinuierlichen Schätzen eines sekundären akustischen Wegs (50), der zwischen dem Wandler (18) und dem internen Mikrofon (30) definiert ist, und Einrichtungen (62) zum Definieren und kontinuierlichen Anwenden des Entzerrungsfilters (52) abhängig von der Schätzung des sekundären akustischen Wegs (50),
    dadurch gekennzeichnet, dass es ein externes Mikrofon (32) umfasst, das angeordnet ist, um ein Schallsignal außerhalb des Gehörgangs (12) zu messen, und die Einrichtungen (60) zum Schätzen des sekundären Wegs geeignet sind, um den sekundären akustischen Weg (50) auch abhängig von dem Schallsignal außerhalb des Gehörgangs (12) zu schätzen, das von dem externen Mikrofon (32) gemessen wird.
  2. In-Ear-Kopfhörer (10) nach Anspruch 1, dadurch gekennzeichnet, dass die Steuereinheit (20) Einrichtungen (90) zum Korrigieren des von dem externen Mikrofon (32) außerhalb des Gehörgangs (12) gemessenen Schallsignals abhängig von einem Modell (90) der dem Kopfhörer eigenen Dämpfung umfasst.
  3. In-Ear-Kopfhörer (10) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass er Einrichtungen (92) zum Nichtberücksichtigen des außerhalb des Gehörgangs (12) gemessenen Schallsignals umfasst, das von dem externen Mikrofon (32) gemessen wird, wenn der Leckagepegel zwischen dem In-Ear-Ohrhörer (10) und dem Gehörgang (12) größer als vorbestimmter Schwellenwert ist.
  4. In-Ear-Kopfhörer (10) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Definitions- und Anwendungseinrichtungen (62) geeignet sind, um eine Verstärkung (G), eine Grenzfrequenz (Fc) als auch einen Gütefaktor (Q) des Filters abhängig von der Schätzung des sekundären akustischen Wegs (50) zu definieren und kontinuierlich auf den Entzerrungsfilter (52) anzuwenden.
  5. In-Ear-Kopfhörer (10) nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Einrichtungen (60) zum kontinuierlichen Schätzen des sekundären akustischen Wegs (50) ein Modell (70) der Übertragungsfunktion des sekundären akustischen Wegs (50) umfassen.
  6. In-Ear-Kopfhörer (10) nach Anspruch 5, dadurch gekennzeichnet, dass die Schätzeinrichtungen (60) eine Regelschleife (100) umfassen, die einen auf das Modell (70) angewandten Optimierungsalgorithmus implementiert.
  7. In-Ear-Kopfhörer (10) nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Einrichtungen (60) zum kontinuierlichen Schätzen des sekundären Wegs (50) Einrichtungen (218) zum Berechnen eines Energiefaktors (EF) umfassen, der aus dem Quotienten der Energie des Frequenzsignals in einem niedrigen Frequenzbereich und der Energie des Frequenzsignals in einem mittleren Frequenzbereich gebildet wird.
  8. In-Ear-Kopfhörer (10) nach Anspruch 7, dadurch gekennzeichnet, dass die Einrichtungen (62) zum Definieren des Filters Berechnungseinrichtungen (400) der Verstärkung (G), der Grenzfrequenz (Fc) und des Filtergütefaktors (Q) durch Anwenden von vordefinierten Funktionen abhängig von dem Energiefaktor (EF) umfassen.
  9. In-Ear-Kopfhörer (10) nach einem der Ansprüche 5 bis 8, dadurch gekennzeichnet, dass er Einrichtungen (312, 314, 316) zum Erstellen eines Konfidenzwerts umfasst, der anhand des wiederzugebenden entzerrten Audiosignals, das auf den Wandler (18) angewandt wird, und des Fehlers zwischen dem wiederzugebenden Audiosignal, auf das die Schätzung des sekundären Wegs angewandt wird, die durch das Modell (70) geliefert wird, und dem Signal, das durch das interne Mikrofon (30) gemessen wird, und Einrichtungen (400) zum Anhalten der Entwicklung der Verstärkung (G), der Grenzfrequenz (Fc) und des Qualitätsfaktors (Q) des Filters, solange der Konfidenzwert unter einem vorbestimmten Schwellenwert ist.
EP21198881.1A 2020-09-25 2021-09-24 In-ear-kopfhörer Active EP3975583B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2009767A FR3114722B1 (fr) 2020-09-25 2020-09-25 écouteur intra-auriculaire

Publications (2)

Publication Number Publication Date
EP3975583A1 EP3975583A1 (de) 2022-03-30
EP3975583B1 true EP3975583B1 (de) 2023-06-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP21198881.1A Active EP3975583B1 (de) 2020-09-25 2021-09-24 In-ear-kopfhörer

Country Status (3)

Country Link
EP (1) EP3975583B1 (de)
CN (1) CN114257913A (de)
FR (1) FR3114722B1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8027481B2 (en) * 2006-11-06 2011-09-27 Terry Beard Personal hearing control system and method
US8774433B2 (en) * 2006-11-18 2014-07-08 Personics Holdings, Llc Method and device for personalized hearing
US9264823B2 (en) 2012-09-28 2016-02-16 Apple Inc. Audio headset with automatic equalization
JP7286938B2 (ja) * 2018-10-18 2023-06-06 ヤマハ株式会社 音響出力装置および音響出力方法

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FR3114722B1 (fr) 2022-09-30
FR3114722A1 (fr) 2022-04-01
EP3975583A1 (de) 2022-03-30
CN114257913A (zh) 2022-03-29

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