WO2014187967A1 - Dispositif acoustique apte à réaliser une réduction active de bruit - Google Patents
Dispositif acoustique apte à réaliser une réduction active de bruit Download PDFInfo
- Publication number
- WO2014187967A1 WO2014187967A1 PCT/EP2014/060683 EP2014060683W WO2014187967A1 WO 2014187967 A1 WO2014187967 A1 WO 2014187967A1 EP 2014060683 W EP2014060683 W EP 2014060683W WO 2014187967 A1 WO2014187967 A1 WO 2014187967A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transfer function
- acoustic
- user
- noise reduction
- noise
- Prior art date
Links
Classifications
-
- 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 capable of achieving an active reduction of noise, 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 earphones, typically positioned on the ears of a user.
- Each earphone is equipped with a microphone capable of receiving a sound signal representative of the ambient noise, said noise signal.
- the active noise reduction is then performed by transmitting by the headphones, at the input of the user's ear canal, an aerial sound signal which is calculated to compensate for the sensed noise signal, also called "counter-noise". noise ".
- the object of the invention is to propose an acoustic device for reducing ambient noise enabling a better attenuation of noise without cluttering for the user.
- the invention proposes an acoustic device adapted to perform an active reduction of noise, positionable on the head of a user, comprising at least one microphone capable of capturing a sound signal representative of ambient noise.
- the acoustic device comprises at least one acoustic active noise reduction module comprising an osteophonic transducer, able to be positioned on a lateral flank of the user's head and to emit a vibratory signal transformed by bone conduction into an acoustic signal perceptible by the user, connected to said microphone, while said at least one acoustic module comprises an electronic circuit capable of generating a vibratory signal to reduce the perception of said ambient noise by the user.
- the acoustic device according to the invention comprises an osteophonic transducer capable of applying an active reduction of noise.
- the space requirement for the user is minimal, no sealing of the ears being necessary to achieve an active reduction of noise.
- the acoustic device according to the invention may also have one or more of the following characteristics, taken independently or in combination:
- said electronic circuit implements a filter defined by a noise reduction transfer function, said transfer function being determined to achieve noise attenuation as a function of direct bone conduction between the osteophonic transducer and the inner ear of a user located on the same side as said transducer;
- said noise reduction transfer function is a function of a ratio of a direct bone conduction transfer function representative of said bone conduction and of an air conduction transfer function representative of the conduction of an aerial acoustic signal between an outer ear and an inner ear located on the same side;
- R is said ratio of a direct bone conduction transfer function and the air conduction transfer function
- H is a characteristic transfer function of the ambient noise
- H m is the transfer function of said microphone
- H T0 is the transfer function of said osteophonic transducer
- each acoustic active noise reduction module comprises an osteophonic transducer and an electronic circuit implementing a filter defined by a noise reduction transfer function, said transfer function being determined as a function of direct bone conduction and conduction transverse bone of a vibratory signal from the opposite osteophonic transducer;
- it furthermore comprises an active noise reduction module by transmitting an aerial counter-noise signal.
- FIG. 1 is an overall view of an acoustic device according to one embodiment of the invention
- FIG. 2 diagrammatically represents an electronic card of the acoustic device according to the invention
- FIG. 3 is a block diagram of active noise reduction according to a first embodiment
- FIG. 4 schematically represents a measurement protocol for direct bone conduction transfer function
- FIG. 5 is a block diagram of active noise reduction according to a second embodiment
- FIG. 6 schematically represents a measurement protocol for transverse bone conduction transfer function
- FIG. 7 is a flowchart of the main steps of a process for determining osteophonic active noise reduction transfer functions.
- the acoustic device 2 of FIG. 1 comprises two osteophonic active noise reduction side acoustic modules 4 which are similar.
- the acoustic device 2 is adapted to be positioned on the head of a user (not shown), the side acoustic modules 4 being positioned in contact with the skull of use, preferably at its temples.
- An acoustic module 4 comprises an osteophonic transducer 8 and a housing 10, comprising a microphone capable of capturing a sound signal representative of an ambient sound, typically an ambient noise.
- the osteophonic transducer 8 comprises a not shown emitter element, able to transform a sound signal into a vibratory signal, transmitted to the user's auditory nerve by bone conduction.
- the emitter element is protected by a protective shell 12, which is preferably composed of two interlocking half-shells.
- the half-shells are, for example, plastic and injection molded.
- the housing 10 also comprises an electronic card, not shown, which will be described in more detail with reference to FIG. 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 sound signal picked up, an electrical signal called "against-noise", transformed into a vibratory signal by the osteophonic transducer 8 and able to reduce or completely cancel 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 strip adapted to support the acoustic modules 4 in the correct position, bearing against the temples of the user.
- a mechanical holding member 14 is in this example a rigid strip adapted to support the acoustic modules 4 in the correct position, bearing against the temples of the user.
- the rigid strip 14 is of adjustable length.
- the acoustic device 2 also comprises a complementary holding member 16, which is in this embodiment a flexible strip 16, preferably of adjustable length, positionable on the top of the user's head in order to ensure a reliable hold.
- a hinge 20 between a fastener 22 of an acoustic module 4 to the holding members 14, 16 is also provided.
- the hinge 20 is adapted to allow adequate positioning of the acoustic modules on the head of a user.
- the hinge 20 is equipped with a not shown spring, adapted to ensure a return of the acoustic module 4 to a rest position.
- the acoustic device according to the invention is equipped with a single acoustic acoustic reduction active lateral module, positioned on one side of the skull of the user.
- any acoustic device or headset including such acoustic modules, is part of the invention.
- one or two osteophonic noise reduction acoustic modules 4 are integrated in a conventional noise reduction type noise reduction device in order to combine the noise reduction by air by generating a overhead noise acoustic signal and osteophonic noise reduction.
- FIG. 2 An electronic card 30 according to the invention is shown in FIG. 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 F o for determining the electrical signal, equivalent to gain and phase, to the osteophonic signal to be transmitted by bone conduction to cancel the signal noise Sb.
- the transfer function H F o is determined for an acoustic device 2 provided with a single osteophonic acoustic reduction module 4.
- the transfer function H F o 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 right and left ears of the user, and considering direct bone conduction only.
- FIG. 3 schematically illustrates the principle of osteophonic noise reduction in this embodiment.
- the case of an acoustic module 4 placed on the left side of the user is considered. It is understood that the principle described below applies symmetrically when an acoustic module 4 is placed on the right lateral side of the skull of the user. Only the transducer 8 forming part of the acoustic module 4 is shown.
- the point I G represents the left inner ear of the user, and the point E G the entry point of the left auditory canal or external ear.
- Noise sound waves 38 are transmitted by air, and picked up by the microphone 40.
- a transfer function H C o defines the bone conduction between the vibratory signal emission by the transducer 8 and the inner ear l G.
- the global transfer function between the input of the microphone 40 and the osteophonic vibration signal emission is denoted H G.
- a transfer function H C A represents the conduction of an air sound signal between the outer ear E G and the inner ear l G , this is the transfer function of the inner and middle ear.
- the transfer function H b G is the characteristic transfer function of the noisy environment, also used in the context of conventional noise reduction.
- H m the transfer function of the microphone 40 and H TO the transfer function of the transducer 8
- H G H m - H FO "H m ( Ec l 3 )
- Such a determination is made, in one embodiment, according to the protocol shown diagrammatically in FIG. 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 with an earpiece 42 positioned on an ear, for example the left ear as in The example of FIG. 3.
- the earphone 42 is a conventional earphone, making it possible to transmit an aerial acoustic signal at the left outer ear of the operator.
- the right outer ear is obstructed, for example by an ear plug, to avoid possible auditory 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 sinusoidal signal generated is transmitted both to the earphone 42 and to a filter 46 whose gain Go and phase ⁇ 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 frequency f given until a cancellation of the sound perceived at the level of his inner ear I.
- the operator thus provides the gain and the phase of the filter 46 for each frequency f, allowing a 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 the earphone 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 a mean transfer function.
- Equation (Eq 4) makes it possible to determine the transfer function H F o of the filter 32 to be applied in order to cancel the ambient sound signal Sb, picked up by the microphone 40, by bone conduction via a transducer 8.
- the transfer function H F o is thus computable by applying the equation (Eq 7) above, in which H g is the transfer function measured as above.
- the transfer functions H m ⁇ H RT and H are determined as is known in the field of active noise reduction, using an acoustic model 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 right inner ear of the user, and vice versa, a bone conduction of the vibratory signal emitted by the right transducer to the left inner ear.
- FIG. 5 diagrammatically illustrates the principle of osteophonic noise reduction 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.
- the points 1 G and 1 D respectively denote the entry points of the left and right inner ear of the user, and the points E G and E D the respective entry points of the entries of the left and right external auditory canals. .
- the respective left and right transfer functions corresponding to the noisy environment may be different, and that a different filtering H F o G and H F o D is applied as input to transducers 8, 8 'respectively.
- a microphone 48 is connected to the left transducer 8 and a microphone 50 is connected to the right transducer 8 '.
- FIG. 6 A schematic representation of a protocol for determining the ratio P 'is illustrated in FIG. 6.
- the listener 52 is placed on the opposite side of the osteophonic transducer 8.
- the conduit of the external ear on the same side as the osteophonic transducer 8 is obstructed by an ear plug 58 for example, to avoid interference.
- a generator 54 of sinusoidal signals similar to the generator 44 of the figure
- the operator has the possibility of adjusting the gain and the phase of the filter 56 for a sinusoidal signal of frequency f given until a cancellation of the sound perceived at the level of his inner ear I.
- the operator thus provides the gain and the filter phase 56 for each frequency f, allowing a cancellation of the sound perceived at the inner ear, between the sound signal supplied via the earphone 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 T At the transfer function of the receiver 52, the following relation is verified:
- H TA 'H CA ⁇ H g ' H TO 'H co ( Ec l 1 4 )
- the function H ' g is provided by experimental measurements for a set of frequency values in the frequency band under consideration.
- the ratio P 'can then be calculated for this set of frequencies by virtue of the relationship provided by the equation (Eq 1 5), knowing the respective transfer functions of the earphone 52 and the transducer 8. Then, it is possible to to deduce 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.
- the transfer functions H FO and H FO are obtained, according to one embodiment of the invention, by the implementation of a determination method whose main steps are illustrated in FIG. 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 conventional acoustic chamber measurement protocol as briefly explained above.
- step 72 the transfer functions H g and H g 'are evaluated in the following step 72, according to, for example, the protocols described with reference to FIGS. 4 and 6.
- step 74 the combined transfer function H m H TA is evaluated, according to a conventional acoustic chamber measurement protocol as briefly explained above.
- Steps 70, 72 and 74 may be performed in a different order.
- the determined transfer functions are stored in a memory associated with a calculation processor for all the 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 osteophonic noise reduction module.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SG11201509619WA SG11201509619WA (en) | 2013-05-23 | 2014-05-23 | Acoustic device capable of producing active noise reduction |
EP14729245.2A EP3000109B1 (fr) | 2013-05-23 | 2014-05-23 | Dispositif acoustique apte à réaliser une réduction active de bruit |
DK14729245.2T DK3000109T3 (da) | 2013-05-23 | 2014-05-23 | Akustisk indretning, der er i stand til at frembringe aktiv støjreduktion |
US14/893,188 US9754577B2 (en) | 2013-05-23 | 2014-05-23 | Acoustic device capable of producing active noise reduction |
KR1020157036313A KR102128142B1 (ko) | 2013-05-23 | 2014-05-23 | 능동 소음 저감이 가능한 음향 장치 |
JP2016514436A JP2016522444A (ja) | 2013-05-23 | 2014-05-23 | 能動型雑音低減処理能力を有する音響装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1354634 | 2013-05-23 | ||
FR1354634A FR3006093B1 (fr) | 2013-05-23 | 2013-05-23 | Dispositif acoustique apte a realiser une reduction active de bruit |
Publications (1)
Publication Number | Publication Date |
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WO2014187967A1 true WO2014187967A1 (fr) | 2014-11-27 |
Family
ID=49578369
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2014/060683 WO2014187967A1 (fr) | 2013-05-23 | 2014-05-23 | Dispositif acoustique apte à réaliser une réduction active de bruit |
Country Status (8)
Country | Link |
---|---|
US (1) | US9754577B2 (fr) |
EP (1) | EP3000109B1 (fr) |
JP (1) | JP2016522444A (fr) |
KR (1) | KR102128142B1 (fr) |
DK (1) | DK3000109T3 (fr) |
FR (1) | FR3006093B1 (fr) |
SG (1) | SG11201509619WA (fr) |
WO (1) | WO2014187967A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021133256A1 (fr) * | 2019-12-23 | 2021-07-01 | Audio Zoom Pte Ltd | Capteur non acoustique pour annulation active du bruit |
KR102225124B1 (ko) | 2020-07-20 | 2021-03-09 | 주식회사 블루콤 | 하이브리드 능동 노이즈 저감 이어폰 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006325895A (ja) * | 2005-05-26 | 2006-12-07 | National Institute Of Advanced Industrial & Technology | 騒音低減装置 |
WO2007107985A2 (fr) * | 2006-03-22 | 2007-09-27 | David Weisman | Procede et systeme de propagation du son par conduction osseuse |
WO2010052720A1 (fr) * | 2008-11-10 | 2010-05-14 | Bone Tone Communications Ltd. | Écouteur et procédé de lecture d'un signal stéréo et d'un signal mono |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2294835A4 (fr) * | 2008-05-22 | 2012-01-18 | Bone Tone Comm Ltd | Procédé et système de traitement de signaux |
EP2577996B1 (fr) * | 2010-06-07 | 2014-08-13 | Phonak AG | Système d'aide auditive à conduction osseuse |
-
2013
- 2013-05-23 FR FR1354634A patent/FR3006093B1/fr active Active
-
2014
- 2014-05-23 DK DK14729245.2T patent/DK3000109T3/da active
- 2014-05-23 SG SG11201509619WA patent/SG11201509619WA/en unknown
- 2014-05-23 US US14/893,188 patent/US9754577B2/en active Active
- 2014-05-23 WO PCT/EP2014/060683 patent/WO2014187967A1/fr active Application Filing
- 2014-05-23 JP JP2016514436A patent/JP2016522444A/ja active Pending
- 2014-05-23 EP EP14729245.2A patent/EP3000109B1/fr active Active
- 2014-05-23 KR KR1020157036313A patent/KR102128142B1/ko active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006325895A (ja) * | 2005-05-26 | 2006-12-07 | National Institute Of Advanced Industrial & Technology | 騒音低減装置 |
WO2007107985A2 (fr) * | 2006-03-22 | 2007-09-27 | David Weisman | Procede et systeme de propagation du son par conduction osseuse |
WO2010052720A1 (fr) * | 2008-11-10 | 2010-05-14 | Bone Tone Communications Ltd. | Écouteur et procédé de lecture d'un signal stéréo et d'un signal mono |
Also Published As
Publication number | Publication date |
---|---|
EP3000109B1 (fr) | 2021-01-27 |
FR3006093A1 (fr) | 2014-11-28 |
US9754577B2 (en) | 2017-09-05 |
SG11201509619WA (en) | 2015-12-30 |
EP3000109A1 (fr) | 2016-03-30 |
KR102128142B1 (ko) | 2020-06-29 |
FR3006093B1 (fr) | 2016-04-01 |
US20160203813A1 (en) | 2016-07-14 |
KR20160015267A (ko) | 2016-02-12 |
DK3000109T3 (da) | 2021-04-06 |
JP2016522444A (ja) | 2016-07-28 |
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