EP3000109B1 - Akustische vorrichtung mit aktiver rauschverminderung - Google Patents

Akustische vorrichtung mit aktiver rauschverminderung Download PDF

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Publication number
EP3000109B1
EP3000109B1 EP14729245.2A EP14729245A EP3000109B1 EP 3000109 B1 EP3000109 B1 EP 3000109B1 EP 14729245 A EP14729245 A EP 14729245A EP 3000109 B1 EP3000109 B1 EP 3000109B1
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Prior art keywords
transfer function
acoustic
noise reduction
user
bone conduction
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English (en)
French (fr)
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EP3000109A1 (de
Inventor
Thierry Pierre François GAIFFE
Patrick Jean François ROBUCHON
Julie Marie Anne ROSIER
Eric Bernard Jacques CLOWEZ
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Elno SAS
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Elno SAS
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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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • 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
    • 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
    • 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
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • 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
    • G10K11/1787—General system configurations
    • G10K11/17873—General system configurations using a reference signal without an error signal, e.g. pure feedforward
    • 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
    • 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
    • G10K2210/3055—Transfer function of the acoustic system
    • 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
    • G10K2210/321—Physical
    • G10K2210/3229—Transducers

Definitions

  • the present invention relates to an acoustic device able to achieve active noise reduction, positionable on the head of a user.
  • the invention lies in the field of active noise reduction.
  • helmets comprising an active noise reduction system.
  • a headset has two headphones, conventionally positioned on the ears of a user.
  • Each earphone is equipped with a microphone capable of picking up an audio signal representative of the ambient noise, called a noise signal.
  • the active noise reduction is then achieved by emission by the headphones, at the input of the auditory canal of the user, of an airborne sound signal which is calculated to compensate for the noise signal picked up, also called “counter- noise ”.
  • the document WO 2010/052720 A1 describes a method for providing an audio signal to two ears of a user using a single earphone.
  • the document WO 2007/107985 A1 describes a method and system for propagating sound by bone conduction.
  • the object of the invention is to propose an acoustic device for reducing ambient noise allowing better noise attenuation without bulk for the user.
  • the invention provides an acoustic device according to claim 1.
  • the acoustic device according to the invention can also have one or more of the characteristics of claims 2 to 4, taken independently or in combination.
  • the acoustic device 2 of the figure 1 comprises two lateral acoustic modules 4 for active noise reduction by osteophonic pathway which are similar.
  • the acoustic device 2 is adapted to be positioned on the head of a user (not shown), the lateral acoustic modules 4 being positioned in contact with the skull of the use, preferably at the level of his temples.
  • An acoustic module 4 comprises an osteophonic transducer 8 and a housing 10, comprising a microphone capable of picking up a sound signal representative of an ambient sound, typically an ambient noise.
  • the osteophonic transducer 8 comprises an emitting element, not shown, capable of transforming a sound signal into a vibratory signal, transmitted to the auditory nerve of the user by bone conduction.
  • the emitting element is protected by a protective shell 12, which is preferably composed of two nested half-shells.
  • the half-shells are, for example, made of plastic and injection molded.
  • the housing 10 also comprises an electronic card, not shown, which will be described in more detail with reference to figure 2 , and which is connected to the ambient sound capture microphone and which comprises an electronic filtering circuit making it possible to generate, from the picked up sound signal, an electrical signal called "counter-noise", transformed into a vibratory signal by the osteophonic transducer 8 and capable of reducing or completely canceling the perception of the ambient sound signal at the level of the auditory nerve of the user.
  • an ambient sound wave is canceled by bone conduction.
  • the acoustic device 2 also comprises a mechanical holding member 14, which is in this example a rigid band capable of supporting the acoustic modules 4 in the appropriate position, resting against the temples of the user.
  • a mechanical holding member 14 is in this example a rigid band capable of supporting the acoustic modules 4 in the appropriate position, resting against the temples of the user.
  • the rigid band 14 is of adjustable length.
  • the acoustic device 2 also comprises a complementary holding member 16, which is in this exemplary embodiment a flexible band 16, preferably of adjustable length, which can be positioned on top of the user's head in order to ensure reliable maintenance.
  • a complementary holding member 16 which is in this exemplary embodiment a flexible band 16, preferably of adjustable length, which can be positioned on top of the user's head in order to ensure reliable maintenance.
  • An articulation 20, between a fastener 22 of an acoustic module 4 to the retaining members 14, 16 is also provided.
  • the articulation 20 is suitable for allowing adequate positioning of the acoustic modules on the head of a user.
  • the articulation 20 is equipped with a spring, not shown, suitable for ensuring a return of the acoustic module 4 to a rest position.
  • the acoustic device according to the invention is equipped with a single lateral acoustic module for active noise reduction, positioned on only one side of the user's skull.
  • any acoustic device or helmet, comprising such acoustic modules, forms part of the invention.
  • one or two acoustic modules 4 for reducing noise by osteophonics are integrated into a conventional noise reduction device, of the noise-canceling headset type, in order to combine the reduction of noise by air by generating a airborne acoustic signal for counter-noise and osteophonic noise reduction.
  • An electronic card 30 according to the invention is shown on figure 2 .
  • An ambient noise signal Sb is picked up by the microphone.
  • a filtering module 32 is connected to the microphone, this module implementing a transfer function H FO making it possible to determine the electrical signal, equivalent to the gain and to the phase, to the osteophonic signal to be transmitted by bone conduction to cancel the signal from noise Sb.
  • the transfer function H FO is determined for an acoustic device 2 provided with a single acoustic module 4 for osteophonic noise reduction.
  • the transfer function H FO thus determined also applies in the case of an acoustic device 2 provided with acoustic modules 4 right and left, but assuming equivalent ambient noise conditions at the level of the right and left ears of the user. , and considering direct bone conduction only.
  • the figure 3 schematically illustrates the principle of osteophonic noise reduction in this embodiment.
  • Point I G represents the user's left inner ear
  • point E G represents the entry point of the left ear canal or outer ear.
  • Noise sound waves 38 are transmitted by air, and picked up by the microphone 40.
  • a transfer function Hco defines the conduction through the bone between the emission of the vibratory signal by the transducer 8 and the inner ear I G.
  • the overall transfer function between the input of the microphone 40 and the emission of the osteophonic vibratory signal is denoted H G.
  • a transfer function H CA represents the conduction of an airborne sound signal between the outer ear E G and the inner ear I G , it is the transfer function of the inner and middle ear.
  • the transfer function H b G is the transfer function characteristic of the noisy environment, also used in the context of conventional noise reduction.
  • H G - H IT H CO ⁇ H b G
  • H G H m ⁇ H FO ⁇ H TO
  • Such a determination is carried out, in one embodiment, according to the protocol shown schematically in figure 4 .
  • a human operator intervenes in this experimental determination.
  • the operator under test is equipped with a transducer 8, positioned laterally, substantially in the region of the temple, and an earpiece 42 positioned on one ear, for example the left ear as in the example of figure 3 .
  • the earpiece 42 is a conventional earpiece, making it possible to transmit an airborne acoustic signal at the level of the operator's left outer ear.
  • the right outer ear is obstructed, for example by an ear plug, in order to avoid possible hearing interference.
  • a generator 44 of sinusoidal signals makes it possible to successively generate signals for a set of frequencies varying from 20 Hz to 20 kHz.
  • a generated sinusoidal signal is transmitted to both the earpiece 42 and to a filter 46, the gain Go of which and the phase ⁇ o are adjustable by the operator.
  • the operator has the possibility of adjusting the gain and the phase of the filter 46 for a sinusoidal signal of given frequency f until he notices a cancellation of the sound perceived at the level of his inner ear I.
  • the operator therefore provides the gain and the phase of filter 46 for each frequency f, allowing cancellation of the sound perceived at the level of the inner ear.
  • the transfer function Hg is obtained by measurement as explained above and stored, and the respective transfer functions of the transducer 8 and of the earpiece 42 are known. Therefore, it is possible to calculate the ratio R.
  • the experimental protocol is repeated for a plurality of operators, thus making it possible to obtain a plurality of subjective measurements for the transfer function Hg in the set of frequencies, and to deduce therefrom an average transfer function.
  • equation (Eq 4) makes it possible to determine the transfer function H FO of the filter 32 to be applied in order to achieve cancellation of the ambient sound signal Sb, picked up by the microphone 40, by bone conduction via a transducer 8.
  • the transfer function H FO can therefore be calculated by applying the equation (Eq 7) above, in which H g is the transfer function measured as above.
  • the transfer functions H m H TA and H b G are determined in a manner known in the field of active noise reduction, using an acoustic mannequin in an acoustic chamber, with a frequency sweep from 20Hz to 20,000Hz.
  • a suitable transfer function is applied, taking into account a transverse bone propagation, that is to say a conduction bone of the vibratory signal emitted by the transducer located on the left to the user's right inner ear, and vice versa, a bone conduction of the vibratory signal emitted by the right transducer to the left inner ear.
  • figure 5 schematically illustrates the principle of noise reduction by osteophonic pathway in this second embodiment.
  • Two similar transducers 8, 8 'and having the same transfer function H TO are considered, respectively annotated G for the left transducer positioned on the left lateral part of the user's skull and D for the right transducer positioned on the right lateral part of the user's skull.
  • Points I G and I D denote the entry points of the user's left and right inner ear, respectively, and points E G and E D are the respective entry points of the entrances to the left and right outer ear canals. .
  • a microphone 48 is connected to the left transducer 8 and a microphone 50 is connected to the right transducer 8 '.
  • H D R 1 - P 2 ⁇ H b G ⁇ P - H b D
  • H G R 1 - P 2 ⁇ H b D ⁇ P - H b G
  • R H IT H CO as before
  • P H CO ′ H CO is the ratio between transverse bone conduction transfer function and direct bone conduction transfer function.
  • FIG. 6 A schematic representation of a protocol for determining the ratio P 'is shown in figure 6 .
  • the listening 52 is placed on the opposite side of the osteophonic transducer 8.
  • the duct of the external ear on the same side as the osteophonic transducer 8 is blocked by an earplug 58 for example, in order to avoid any interference.
  • a generator 54 of sinusoidal signals makes it possible to successively generate signals for a set of frequencies varying from 20 Hz to 20kHz.
  • a generated sinusoidal signal is transmitted to both the earpiece 52 and to a filter 56, the gain G ' o and the phase ⁇ 'o of which are adjustable by the operator.
  • the operator has the possibility of adjusting the gain and the phase of the filter 56 for a sinusoidal signal of given frequency f until he observes a cancellation of the sound perceived at the level of his inner ear I.
  • the operator therefore provides the gain and the filter phase 56 for each frequency f, allowing cancellation of the sound perceived at the level of the inner ear, between the sound signal supplied via the earpiece 52 and the vibratory signal transmitted by bone conduction from the transducer 8.
  • H ' g the function of transfer of the filter 56
  • H TO the transfer function of the transducer 8
  • H TA the transfer function of the earpiece 52
  • the function H ' g is provided by experimental measurements, for a set of frequency values in the frequency band considered.
  • the ratio P ′ can then be calculated for this set of frequencies thanks to the relation provided by the equation (Eq 15), knowing the respective transfer functions of the earpiece 52 and of the transducer 8. Then, it is possible to deduce therefrom the transfer functions H FO G and H FO D to be implemented by the respective filters of the electronic cards associated with each acoustic module 4.
  • H FO D - H g H m ⁇ H YOUR 1 - Q 2 ⁇ H b G
  • H FO G - H g H m ⁇ H YOUR 1 - Q 2 ⁇ H b D Q - H b G
  • the transfer functions H FO G and H FO D are obtained, according to one embodiment of the invention, by the implementation of a determination method, the main steps of which are illustrated on figure 7 .
  • a first step 70 the transfer functions H b G and H b D representative of the characteristics of the environment are calculated, according to a standard measurement protocol in an acoustic chamber as briefly explained above.
  • step 74 the combined transfer function H m ⁇ H TA is evaluated, according to a standard measurement protocol in an acoustic chamber as briefly explained above.
  • Steps 70, 72 and 74 can be performed in a different order.
  • the determined transfer functions are stored in a memory associated with a calculation processor for the set of frequencies of the desired frequency interval.
  • step 76 the transfer functions H FO G and H FO D are determined by calculation, using the relationships (Eq 16) and (Eq 17) above.
  • the respective transfer functions thus determined are each implemented in an electronic filtering circuit of a filter card of an acoustic module for osteophonic noise reduction.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Headphones And Earphones (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Circuit For Audible Band Transducer (AREA)

Claims (4)

  1. Akustikvorrichtung (2), welche imstande ist, eine aktive Geräuschreduzierung zu realisieren, und welche am Kopf eines Nutzers positionierbar ist, aufweisend zumindest ein Mikrofon, welches imstande ist, ein Schallsignal zu erfassen, welches repräsentativ für ein Umgebungsgeräusch ist, und aufweisend zumindest ein Akustikmodul (4) zur aktiven Geräuschreduzierung, welches einen osteophonischen Wandler (8, 8') aufweist, welcher imstande ist, an einer seitlichen Flanke des Kopfes des Nutzers angeordnet zu sein und ein Schwingungssignal auszusenden, welches mittels Knochenleitung in ein akustisches Signal umgewandelt wird, welches vom Nutzer wahrnehmbar ist, und welcher mit dem besagten Mikrofon verbunden ist, wobei das besagte zumindest eine Akustikmodul (4) einen elektronischen Schaltkreis (30) aufweist, welcher imstande ist, ein Schwingungssignal zu erzeugen, welches es erlaubt, die Wahrnehmung des besagten Umgebungsgeräuschs durch den Nutzer abzuschwächen, wobei die Akustikvorrichtung (2) dadurch gekennzeichnet ist, dass der besagte elektronische Schaltkreis (30) ein Filter (32) implementiert, welches mittels einer Übertragungsfunktion (HFO) zur Geräuschreduzierung definiert ist, wobei die besagte Übertragungsfunktion (HFO) ermittelt wird, um eine Geräuschabschwächung in Abhängigkeit von einer direkten Knochenleitung zwischen dem osteophonischen Wandler (8, 8') und dem Innenohr eines Nutzers, welches sich auf derselben Seite wie der besagte Wandler (8, 8') befindet, zu realisieren, wobei die besagte Übertragungsfunktion (HFO) zur Geräuschreduzierung abhängig ist von einem Verhältnis einer Übertragungsfunktion der direkten Knochenleitung (Hco), welche repräsentativ für die besagte Knochenleitung ist, und einer Übertragungsfunktion der Luftleitung (HCA), welche repräsentativ für die Leitung eines akustischen Luftsignals zwischen einem Außenohr und einem Innenohr ist, welche sich auf einer selben Seite befinden,
    und dadurch, dass die besagte Übertragungsfunktion definiert ist durch die Formel: H FO = − R ⋅ H b G H m . H TO ,
    Figure imgb0028
     wobei R das Verhältnis einer Übertragungsfunktion der direkten Knochenleitung (Hco) und einer Übertragungsfunktion der Luftleitung (HCA) ist, H b G
    Figure imgb0029
     eine für das Umgebungsgeräusch charakteristische Übertragungsfunktion ist, Hm die Übertragungsfunktion des besagten Mikrofons ist und HTO die Übertragungsfunktion des besagten osteophonischen Wandlers (8, 8') ist.
  2. Akustikvorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass sie zwei besagte Akustikmodule (4) zur aktiven Geräuschreduzierung aufweist, welche imstande sind, an entgegengesetzten lateralen Seiten des Kopfes eines Nutzers angeordnet zu sein.
  3. Akustikvorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, dass jedes Akustikmodul (4) zur aktiven Geräuschreduzierung aufweist einen osteophonischen Wandler (8, 8') und einen elektronischen Schaltkreis (30), welcher ein Filter (32) implementiert, welches mittels einer Übertragungsfunktion (HFO) zur Geräuschreduzierung definiert ist, wobei die besagte Übertragungsfunktion (HFO) ermittelt wird in Abhängigkeit von einer direkten Knochenleitung (Hco) und von einer Quer-Knochenleitung (Hco') eines Schwingungssignals aus dem entgegengesetzten osteophonischen Wandler.
  4. Akustikvorrichtung gemäß einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass sie ferner aufweist ein Modul zur aktiven Geräuschreduzierung mittels des Übertragens eines Luft-Gegengeräusch-Signals.
EP14729245.2A 2013-05-23 2014-05-23 Akustische vorrichtung mit aktiver rauschverminderung Active EP3000109B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1354634A FR3006093B1 (fr) 2013-05-23 2013-05-23 Dispositif acoustique apte a realiser une reduction active de bruit
PCT/EP2014/060683 WO2014187967A1 (fr) 2013-05-23 2014-05-23 Dispositif acoustique apte à réaliser une réduction active de bruit

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EP3000109A1 EP3000109A1 (de) 2016-03-30
EP3000109B1 true EP3000109B1 (de) 2021-01-27

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US (1) US9754577B2 (de)
EP (1) EP3000109B1 (de)
JP (1) JP2016522444A (de)
KR (1) KR102128142B1 (de)
DK (1) DK3000109T3 (de)
FR (1) FR3006093B1 (de)
SG (1) SG11201509619WA (de)
WO (1) WO2014187967A1 (de)

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Publication number Priority date Publication date Assignee Title
WO2021133256A1 (en) * 2019-12-23 2021-07-01 Audio Zoom Pte Ltd Non-acoustic sensor for active noise cancellation
KR102225124B1 (ko) 2020-07-20 2021-03-09 주식회사 블루콤 하이브리드 능동 노이즈 저감 이어폰
GB2628358A (en) * 2023-03-21 2024-09-25 Sony Interactive Entertainment Inc A system for outputting audio for a user, and a method thereof

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JP4310477B2 (ja) * 2005-05-26 2009-08-12 独立行政法人産業技術総合研究所 騒音低減装置
EP2011367B1 (de) * 2006-03-22 2014-12-03 Bone Tone Communications Ltd. Verfahren und system zur knochenleitungs-schallausbreitung
CN102084668A (zh) * 2008-05-22 2011-06-01 伯恩同通信有限公司 处理信号的方法和系统
US8855328B2 (en) * 2008-11-10 2014-10-07 Bone Tone Communications Ltd. Earpiece and a method for playing a stereo and a mono signal
WO2010094812A2 (en) * 2010-06-07 2010-08-26 Phonak Ag Bone conduction hearing aid system

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KR20160015267A (ko) 2016-02-12
SG11201509619WA (en) 2015-12-30
DK3000109T3 (da) 2021-04-06
US9754577B2 (en) 2017-09-05
JP2016522444A (ja) 2016-07-28
EP3000109A1 (de) 2016-03-30
WO2014187967A1 (fr) 2014-11-27
US20160203813A1 (en) 2016-07-14
FR3006093B1 (fr) 2016-04-01
FR3006093A1 (fr) 2014-11-28
KR102128142B1 (ko) 2020-06-29

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