EP2433431B1 - Acoustic device - Google Patents
Acoustic device Download PDFInfo
- Publication number
- EP2433431B1 EP2433431B1 EP10728788.0A EP10728788A EP2433431B1 EP 2433431 B1 EP2433431 B1 EP 2433431B1 EP 10728788 A EP10728788 A EP 10728788A EP 2433431 B1 EP2433431 B1 EP 2433431B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- microphone
- acoustic
- acoustic device
- transducer
- module
- 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.)
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Links
- 210000000988 bone and bone Anatomy 0.000 claims description 21
- 230000005236 sound signal Effects 0.000 claims description 16
- 230000001681 protective effect Effects 0.000 claims description 11
- 210000003625 skull Anatomy 0.000 claims description 11
- 230000005284 excitation Effects 0.000 claims description 8
- 210000001260 vocal cord Anatomy 0.000 claims description 7
- 210000000860 cochlear nerve Anatomy 0.000 claims description 6
- 230000001902 propagating effect Effects 0.000 claims description 6
- 210000004373 mandible Anatomy 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 4
- 229920003051 synthetic elastomer Polymers 0.000 claims description 4
- 239000005061 synthetic rubber Substances 0.000 claims description 4
- 230000000721 bacterilogical effect Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 210000002050 maxilla Anatomy 0.000 claims 1
- 230000004936 stimulating effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 4
- 230000000284 resting effect Effects 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 235000012830 plain croissants Nutrition 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001755 vocal effect Effects 0.000 description 1
Images
Classifications
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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
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
- H04R1/083—Special constructions of mouthpieces
-
- 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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
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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
- 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
- H04R2460/13—Hearing devices using bone conduction transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/033—Headphones for stereophonic communication
Definitions
- the present invention relates to an acoustic device of the type comprising an acoustic contact microphone and a microphone holding bar resting on a side flank of the skull, said microphone comprising a housing and a bone mechanical excitation transducer disposed in the housing, said transducer being able to receive by bone conduction a sound signal from the vocal cords, said housing having a bearing wall on an area of the cheek.
- the invention also relates to an operator head equipment comprising a protective helmet and such an acoustic device.
- the microphone transducer detects mechanical vibratory waves of a sound signal coming from the vocal cords, the vibratory waves being transmitted by bone conduction through the mandible bone of a human skull. .
- the microphone transducer is adapted to transform the detected mechanical vibratory waves into an electrical signal, which is transmitted to a communication system by a connecting cable.
- the electrical signal corresponding to the initial sound signal and transmitted by the acoustic device to the communication system is difficult to understand.
- the consonants / vowels / consonants (CVC) rate which measures the recognition rate of consonants and vowels in a sound sequence, is significantly less than 50% with such an acoustic device. This low rate reflects the difficulty of listening to an electrical signal from the acoustic device.
- the transducer ensures a correct transformation of the mechanical signal into an electrical signal and the low CVC rate results more particularly from a deformation of the vibratory waves of the sound signal during their path between the vocal cords and the transducer, as described in the document WO2005 / 067340 .
- the object of the invention is therefore to allow a better quality of listening of the signal from the acoustic device, and in particular to increase the value of the CVC rate for a sound signal transmitted by this device.
- the subject of the invention is therefore an acoustic device of the aforementioned type, characterized in that the wall in contact with the transducer of the microphone, has a hardness of between 45 and 85 Shore A and a thickness between 0.4 and 0.6 mm.
- the invention also relates to a head gear for operator comprising a protective helmet, characterized in that it comprises an acoustic device as defined above.
- an acoustic device 2 comprises an acoustic contact microphone 4 connected to one of the two lateral acoustic modules 6.
- the acoustic device 2 also comprises an upper arch 8, a rear arch 10 connecting the acoustic modules 6, and a connection cable 12.
- the upper arch 8 also called headband 8, is of adjustable length and adapted to be positioned on the top of the head.
- the rear arch 10 made of a rigid material, is a mechanical support bar of the microphone 4 resting on the mandible bone and each module 6 bears on a corresponding lateral side of the skull.
- the support bar 10 is of adjustable length, and able to be positioned under the bone of the rock behind the head, near the neck.
- the contact microphone 4 comprises a transducer 14 with mechanical bone excitation, visible on the Figures 5 and 6 disposed in a protective housing 16.
- the housing 16 is connected to a corresponding acoustic module 6 by two connecting arms 18.
- the transducer 14 of the microphone is a clean accelerometer to receive by bone conduction, in particular through the mandible bone of the skull, the vibratory waves of a sound signal from the vocal cords and to transform them into an electrical signal.
- the housing 16 has a wall 20 for bearing on an area of the cheek and an external mass 22 for protecting the accelerometer 14 of the contact microphone, on the opposite side to the support wall 20, as shown in FIGS. Figures 5 and 6 .
- the housing 16 is made of synthetic rubber.
- the wall 20 is in the form of a skin in contact with the accelerometer 14 of the microphone.
- the skin 20, visible in section on the Figures 5 and 6 has a value hardness of between 45 and 85 shores A, so that the skin 20 is of mechanical impedance substantially equal to the mechanical impedance of the cheek.
- the value of the hardness of the skin 20 is preferably between 55 and 80 Shore A, more preferably between 65 and 75 Shore A.
- the thickness E of the skin 20 is between 0.4 mm and 0.6 mm. mm, preferably equal to 0.5 mm.
- the skin 20 is made of synthetic rubber, for example rubber based on polychloroprene.
- the housing 16 has a first internal cavity 24 for receiving the accelerometer 14 and a second internal cavity 25.
- the first internal cavity 24 is located behind the skin 20.
- the second cavity 25 is disposed behind the first cavity 24.
- the skin 20 is able to guarantee the tightness of the cavities 24, 25.
- the first cavity 24 has dimensions substantially identical to those of the accelerometer 14, so that the accelerometer 14 is immobilized in the housing 16.
- the accelerometer 14 is an accelerometer with an axis oriented substantially in a direction normal to the skin 20, to allow a restoration of the vibratory wave transmitted by bone conduction that is homogeneous depending on the different users.
- the mass 22 of protection is made of an absorbent material and suitable for attenuating the vibrations in the high frequencies, especially for frequencies greater than 1000 hertz.
- the mass 22 has a mass substantially equal to 10 grams.
- the sealing skin and the protective mass 22 isolate the accelerometer 14 from noise and climatic disturbances of the external environment.
- the connecting arms 18 form acoustic decoupling means between the microphone 4 and the module 6 to which the microphone 4 is connected.
- the two arms 18 are interconnected by a thin wall 26 of connection, visible on the Figures 2 and 3 .
- the wall 26 of connection is integral with each of the two arms 18.
- Each arm 18 has a first outer edge 28 facing the first outer edge 28 of the other arm 18, and a second outer edge 29 diametrically opposite its first outer edge 28.
- the connecting wall 26 is disposed between the first outer edges 28 and facing one another, the two connecting arms 18.
- the distance D1 is in particular less than the distance D2.
- the distance D3 is in particular less than the distance D4.
- the progressively increasing separation, from the microphone 4 to the acoustic module 6, between the second outer edges 29 of the two connecting arms is adapted to allow attenuation of mechanical sound waves propagating from the microphone 4 to the corresponding acoustic module 6.
- Each connecting arm 18 has an inner orifice 30 extending substantially vertically in the direction of the connecting arm 18 and a rib 32 protruding away from the skin 20, as shown in FIGS. figures 3 and 6 .
- Each orifice 30 communicates with the second cavity 25.
- Each acoustic module 6, visible on the figure 1 comprises a support plate 34 on a side flank of the skull and a transducer 36 of mechanical bone excitation.
- a hinge 38 is provided between the support plate 34 and the transducer 36.
- a spring not shown, equips the hinge 38 and is adapted to provide a return in rotation about the hinge axis 38, the transducer 36 relative to the plate 34 to a rest position.
- Each plate 34 comprises a support plate 40 able to bear on the skull above an ear.
- a clearance passage of the ear is formed in the lower part of each plate 40.
- Each plate 34 has, in the rear part of the plate 40, a housing 42 formed of two half-shells 44, 46, fixed together by means 48.
- the support plate 40 and the two half-shells 44, 46 of the housing 42 are, for example, plastic and injection molded.
- the bone mechanical excitation transducer 36 of each acoustic module 6 comprises an emissive element, not shown, and two half-shells 50, 52 protecting the emissive element.
- the emissive element is able to transform an electrical signal received into vibratory waves representative of the sound signal and to transmit them to the auditory nerve by bone conduction.
- the half-shells 50, 52 are, for example, plastic and injection molded.
- a cable 54, visible on the figure 6 connecting the accelerometer 14 and the corresponding housing 42 is fixed in one of the two orifices 30 by fixing means 56, such as adhesive means.
- a user of the acoustic device 2 begins by positioning the device 2 on his head, by placing the strap 8 on the top of his skull, the rear arch 10 behind his head, near his neck and the support plates 34 on the lateral flanks of his skull, above each respective ear.
- the clearance formed in the lower part of the support plates 40 ensures good ergonomics of the plate 34 relative to the upper part of the flag of the ear.
- the user After positioning the device 2 on his head, the user adjusts the upper arch 8 on his head and the rear arch 10 on his neck.
- the adjustment of the microphone 4 on the skin of the cheek and the mandibular bone takes place naturally and automatically through the corresponding articulation 38 and the flexibility of the connecting arms 18.
- each bone mechanical excitation transducer 36 on the corresponding temple takes place naturally and automatically by each articulation 38.
- the mechanical impedance of the skin 20 of the microphone housing is substantially equal to the mechanical impedance of the user's cheek, the reception by the accelerometer 14 of mechanical vibratory waves of the sound signal coming from the vocal chords is much better.
- the mounting of the accelerometer is by the skin 20 equivalent to a mounting where the accelerometer would be directly disposed in contact with the cheek of the user who would be slightly thicker. The disturbances in reception due to the material of the housing 16 are therefore significantly reduced.
- the acoustic device 2 also allows a high attenuation of vibrations at high frequencies, by the immobilization of the accelerometer 14 in the housing 16 and the mass 22 protection.
- the immobilization of the accelerometer 14 and the inertia of the mass 22 indeed allow good damping parasitic mechanical movements, due in particular to airborne noise.
- the acoustic device 2 thus allows a good reception by bone conduction of the movements of mechanical vibratory waves of the sound signal from the vocal cords, while significantly reducing the mechanical disturbances due to parasitic airborne noise.
- the acoustic decoupling means between the microphone 4 and the module 6 make it possible to limit a mechanical disturbance of the microphone 4 by the acoustic module 6, when the sound signal is received.
- the decoupling means also allow, by the flared form of the spacing between the connecting arms 18 and the microphone 4 to the acoustic module 6, a significant attenuation of the mechanical vibratory waves propagating from the microphone 4 in the direction
- the acoustic decoupling means therefore strongly limit the mutual disturbances between the microphone 4 and the corresponding acoustic module 6.
- the acoustic device 2 according to the invention thus makes it possible to obtain a good reception of the sound signal coming from the vocal cords and a good transmission of vibratory waves to the auditory nerve by bone conduction.
- the upper bow 8 allows, because of its small thickness and its flexible material, wearing a heavy helmet without discomfort on the top of the head.
- the mechanical support of the microphone 4 and the two modules 6 is provided by the rear arch 10, while the upper arch 8 has a role of holding in position on the top of the head.
- the transducer of the contact microphone is enclosed in a rubber protective casing, the protective casing being itself fixed in the first internal cavity of the housing of the contact microphone.
- the support wall is integral with the protective envelope.
- the acoustic device 2 does not include an acoustic module.
- the acoustic device 2 is suitable for use with a biker helmet, a helmet for a motor vehicle driver, a helmet for an armored vehicle, a fireman's helmet, a helmet for a safety officer, a helmet construction helmet, a helmet for an aircraft pilot.
- the acoustic device 2 is a headphone for a switchboard operator.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Description
La présente invention concerne un dispositif acoustique du type comprenant un microphone acoustique de contact et un arceau de maintien du microphone en appui sur un flanc latéral du crâne, ledit microphone comportant un boîtier et un transducteur à excitation mécanique osseuse disposé dans le boîtier, ledit transducteur étant apte à recevoir par conduction osseuse un signal sonore issu des cordes vocales, ledit boîtier comportant une paroi d'appui sur une zone de la joue.The present invention relates to an acoustic device of the type comprising an acoustic contact microphone and a microphone holding bar resting on a side flank of the skull, said microphone comprising a housing and a bone mechanical excitation transducer disposed in the housing, said transducer being able to receive by bone conduction a sound signal from the vocal cords, said housing having a bearing wall on an area of the cheek.
L'invention concerne également un équipement de tête pour opérateur comprenant un casque de protection et un tel dispositif acoustique.The invention also relates to an operator head equipment comprising a protective helmet and such an acoustic device.
Avec un dispositif acoustique de l'état de la technique, le transducteur du microphone détecte des ondes vibratoires mécaniques d'un signal sonore issu des cordes vocales, les ondes vibratoires étant transmises par conduction osseuse à travers l'os mandibule d'un crâne humain. Le transducteur du microphone est propre à transformer les ondes vibratoires mécaniques détectées en un signal électrique, qui est transmis à un système de communication par un câble de connexion.With an acoustic device of the state of the art, the microphone transducer detects mechanical vibratory waves of a sound signal coming from the vocal cords, the vibratory waves being transmitted by bone conduction through the mandible bone of a human skull. . The microphone transducer is adapted to transform the detected mechanical vibratory waves into an electrical signal, which is transmitted to a communication system by a connecting cable.
Toutefois, le signal électrique correspondant au signal sonore initial et transmis par le dispositif acoustique au système de communication est difficilement compréhensible. En particulier, le taux consonnes/voyelles/consonnes (CVC), qui mesure le taux de reconnaissance des consonnes et des voyelles dans une séquence sonore, est nettement inférieur à 50% avec un tel dispositif acoustique. Ce faible taux reflète la difficulté d'écoute d'un signal électrique issu du dispositif acoustique.However, the electrical signal corresponding to the initial sound signal and transmitted by the acoustic device to the communication system is difficult to understand. In particular, the consonants / vowels / consonants (CVC) rate, which measures the recognition rate of consonants and vowels in a sound sequence, is significantly less than 50% with such an acoustic device. This low rate reflects the difficulty of listening to an electrical signal from the acoustic device.
Le transducteur assure une transformation correcte du signal mécanique en un signal électrique et le faible taux CVC résulte plus particulièrement d'une déformation des ondes vibratoires du signal sonore lors de leur trajet entre les cordes vocales et le transducteur, comme décrit dans le document
L'invention a donc pour objet un dispositif acoustique du type précité, caractérisé en ce que la paroi en contact avec le transducteur du microphone, présente une dureté comprise entre 45 et 85 shores A et une épaisseur comprise entre 0,4 et 0,6 mm.The subject of the invention is therefore an acoustic device of the aforementioned type, characterized in that the wall in contact with the transducer of the microphone, has a hardness of between 45 and 85 Shore A and a thickness between 0.4 and 0.6 mm.
Suivant d'autres modes de réalisation, le dispositif acoustique comprend une ou plusieurs des caractéristiques suivantes, prises isolément ou suivant toutes les combinaisons techniquement possibles :
- la dureté de la paroi est comprise entre 55 et 80 shores A, de préférence comprise entre 65 et 75 shores A ;
- la paroi est venue de matière avec une enveloppe de protection du transducteur du microphone de contact ;
- le transducteur du microphone de contact est un accéléromètre ;
- le transducteur du microphone de contact est immobilisé dans le boîtier ;
- le boîtier comporte une masse de protection du transducteur du microphone de contact, du côté opposé à la paroi d'appui ;
- le boîtier est réalisé en caoutchouc synthétique ;
- le microphone acoustique est propre à prendre appui sur l'os mandibule, également appelé os maxillaire inférieur ;
- le dispositif comprend deux modules acoustiques latéraux en appui sur les flancs latéraux du crâne et propres à transmettre un signal sonore au nerf auditif ;
- les modules acoustiques latéraux comportent chacun un transducteur d'excitation mécanique osseux apte à transmettre un signal sonore au nerf auditif par conduction osseuse, et sont reliés entre eux par au moins un arceau de liaison ;
- le microphone est relié à un module acoustique correspondant, et le dispositif comporte des moyens de découplage acoustique entre le microphone et le module auquel le microphone est relié ;
- le microphone est relié au module acoustique correspondant par deux bras de liaison, et l'écartement entre les bords, extérieurs et en regard l'un de l'autre, des deux bras de liaison est progressivement croissant depuis le microphone vers le module acoustique, afin de permettre une atténuation des ondes mécaniques sonores se propageant depuis le microphone vers le module acoustique correspondant ;
- le dispositif est, de par ses dimensions, apte à être utilisé avec un casque lourd de fantassin ou avec un masque nucléaire bactériologique chimique.
- the hardness of the wall is between 55 and 80 Shore A, preferably between 65 and 75 Shore A;
- the wall is integral with a protective cover of the transducer of the contact microphone;
- the transducer of the contact microphone is an accelerometer;
- the transducer of the contact microphone is immobilized in the housing;
- the housing comprises a protective mass of the transducer of the contact microphone, on the opposite side to the support wall;
- the housing is made of synthetic rubber;
- the acoustic microphone is able to bear on the mandible bone, also called the lower jawbone;
- the device comprises two lateral acoustic modules resting on the lateral flanks of the skull and able to transmit a sound signal to the auditory nerve;
- the lateral acoustic modules each comprise a bone mechanical excitation transducer capable of transmitting a sound signal to the auditory nerve by bone conduction, and are interconnected by at least one connecting arch;
- the microphone is connected to a corresponding acoustic module, and the device comprises acoustic decoupling means between the microphone and the module to which the microphone is connected;
- the microphone is connected to the corresponding acoustic module by two connecting arms, and the spacing between the outer and opposite edges of the two connecting arms is progressively increasing from the microphone towards the acoustic module, to allow attenuation of sound mechanical waves propagating from the microphone to the corresponding acoustic module;
- the device is, by its dimensions, suitable for use with a heavy infantryman's helmet or with a chemical bacteriological nuclear mask.
L'invention a également pour objet un équipement de tête pour opérateur comprenant un casque de protection, caractérisé en ce qu'il comporte un dispositif acoustique tel que défini ci-dessus.The invention also relates to a head gear for operator comprising a protective helmet, characterized in that it comprises an acoustic device as defined above.
L'invention et ses avantages seront mieux compris à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple, faite en référence aux dessins annexés, sur lesquels :
- la
figure 1 est une vue d'ensemble en perspective d'un dispositif acoustique selon l'invention, - la
figure 2 est une vue de face d'un microphone du dispositif acoustique selon l'invention, - la
figure 3 est une vue en coupe selon le plan III de lafigure 2 , - la
figure 4 est une vue en coupe selon le plan IV de lafigure 2 , - la
figure 5 est une vue en coupe selon le plan V de lafigure 2 , et - la
figure 6 est une vue en coupe selon le plan VI de lafigure 2 .
- the
figure 1 is an overall perspective view of an acoustic device according to the invention, - the
figure 2 is a front view of a microphone of the acoustic device according to the invention, - the
figure 3 is a sectional view according to plan III of thefigure 2 , - the
figure 4 is a sectional view along plane IV of thefigure 2 , - the
figure 5 is a sectional view along the plane V of thefigure 2 , and - the
figure 6 is a sectional view according to plane VI of thefigure 2 .
Sur la
L'arceau supérieur 8, également appelé arceau 8 de tête, est de longueur réglable et apte à être positionné sur le dessus de la tête.The
L'arceau arrière 10, réalisé avec un matériau rigide, est un arceau de maintien mécanique du microphone 4 en appui sur l'os mandibule et de chaque module 6 en appui sur un flanc latéral correspondant du crâne. L'arceau de maintien 10 est de longueur réglable, et apte à être positionné sous l'os du rocher derrière la tête, près de la nuque.The
Le microphone de contact 4 comprend un transducteur 14 à excitation mécanique osseuse, visible sur les
Le transducteur 14 du microphone est un accéléromètre propre à recevoir par conduction osseuse, notamment à travers l'os mandibule du crâne, les ondes vibratoires d'un signal sonore issu des cordes vocales et à les transformer en un signal électrique.The
Le boîtier 16 comporte une paroi 20 d'appui sur une zone de la joue et une masse extérieure 22 de protection de l'accéléromètre 14 du microphone de contact, du côté opposé à la paroi 20 d'appui, comme représenté sur les
La paroi 20 est en forme de peau en contact avec l'accéléromètre 14 du microphone. La peau 20, visible en coupe sur les
Le boîtier 16 comporte une première cavité intérieure 24 de réception de l'accéléromètre 14 et une deuxième cavité intérieure 25. La première cavité intérieure 24 est située derrière la peau 20. La deuxième cavité 25 est disposée derrière la première cavité 24. La peau 20 est propre à garantir l'étanchéité des cavités 24, 25.The
La première cavité 24 présente des dimensions sensiblement identiques à celles de l'accéléromètre 14, de sorte que l'accéléromètre 14 est immobilisé dans le boîtier 16.The
L'accéléromètre 14 est un accéléromètre à un axe orienté sensiblement selon une direction normale à la peau 20, afin de permettre une restitution de l'onde vibratoire transmise par conduction osseuse qui soit homogène en fonction des différents utilisateurs.The
La masse 22 de protection est réalisée en une matière absorbante et propre à atténuer les vibrations dans les hautes fréquences, notamment pour les fréquences supérieures à 1000 hertz. La masse 22 présente une masse sensiblement égale à 10 grammes.The
La peau 20 d'étanchéité et la masse 22 de protection isolent l'accéléromètre 14 des perturbations sonores et climatiques de l'environnement extérieur.The sealing skin and the
Les bras 18 de liaison forment des moyens de découplage acoustique entre le microphone 4 et le module 6 auquel le microphone 4 est relié. Les deux bras 18 sont reliés entre eux par une mince paroi 26 de liaison, visible sur les
L'écartement entre les premiers bords extérieurs 28, représenté par la distance D1 sur la
L'écartement entre les seconds bords extérieurs 29, représenté par la distance D3 sur la
Chaque bras 18 de liaison comporte un orifice 30 intérieur s'étendant sensiblement verticalement selon la direction du bras 18 de liaison et une nervure 32 faisant saillie à l'opposé de la peau 20, comme représenté sur les
Chaque module acoustique 6, visible sur la
Une articulation 38 est prévue entre la platine 34 d'appui et le transducteur 36. Un ressort, non représenté, équipe l'articulation 38 et est propre à assurer un rappel en rotation autour de l'axe d'articulation 38, du transducteur 36 par rapport à la platine 34 vers une position de repos.A
Chaque platine 34 comprend une plaque d'appui 40 propre à prendre appui sur le crâne au-dessus d'une oreille. Un dégagement de passage de l'oreille est ménagé en partie basse de chaque plaque 40. Chaque platine 34 comporte, en partie arrière de la plaque 40, un boîtier 42 formé de deux demi-coques 44, 46, fixées entre elles via des moyens de fixation 48. La plaque d'appui 40 et les deux demi-coques 44, 46 du boîtier 42 sont, par exemple, en matière plastique et moulées par injection.Each
Le transducteur 36 d'excitation mécanique osseuse de chaque module acoustique 6 comprend un élément émissif, non représenté, et deux demi-coques 50, 52 protégeant l'élément émissif. L'élément émissif est apte à transformer un signal électrique reçu en ondes vibratoires représentatives du signal sonore et à les transmettre au nerf auditif par conduction osseuse.The bone
Les demi-coques 50, 52 sont, par exemple, en matière plastique et moulées par injection.The half-
Un câble 54, visible sur la
Ainsi, un utilisateur du dispositif acoustique 2 commence par positionner le dispositif 2 sur sa tête, en plaçant la sangle 8 sur le dessus de son crâne, l'arceau arrière 10 derrière sa tête, près de sa nuque et les platines 34 d'appui sur les flancs latéraux de son crâne, au-dessus de chaque oreille respective. Le dégagement ménagé dans la partie basse des plaques d'appui 40 assure une bonne ergonomie de la platine 34 par rapport à la partie supérieure du pavillon de l'oreille.Thus, a user of the
Après avoir positionné le dispositif 2 sur sa tête, l'utilisateur ajuste l'arceau supérieur 8 sur sa tête puis l'arceau arrière 10 sur sa nuque. L'ajustement du microphone 4 sur la peau de la joue et l'os mandibule s'opère naturellement et automatiquement de par l'articulation 38 correspondante et de par la flexibilité des bras 18 de liaison.After positioning the
L'ajustement de la position de chaque transducteur 36 d'excitation mécanique osseuse sur la tempe correspondante s'opère naturellement et automatiquement de par chaque articulation 38.The adjustment of the position of each bone
L'impédance mécanique de la peau 20 du boîtier du microphone étant sensiblement égale à l'impédance mécanique de la joue de l'utilisateur, la réception par l'accéléromètre 14 des ondes vibratoires mécaniques du signal sonore issu des cordes vocales est bien meilleure. Le montage de l'accéléromètre est de par la peau 20 équivalent à un montage où l'accéléromètre serait directement disposé au contact de la joue de l'utilisateur qui serait légèrement plus épaisse. Les perturbations en réception dues au matériau du boîtier 16 sont donc nettement diminuées.Since the mechanical impedance of the
Le dispositif acoustique 2 selon l'invention permet également une forte atténuation des vibrations en hautes fréquences, de par l'immobilisation de l'accéléromètre 14 dans le boîtier 16 et de par la masse 22 de protection. L'immobilisation de l'accéléromètre 14 et l'inertie de la masse 22 permettent en effet un bon amortissement des mouvements mécaniques parasites, dus notamment aux bruits aériens.The
Le dispositif acoustique 2 selon l'invention permet ainsi une bonne réception par conduction osseuse des mouvements des ondes vibratoires mécaniques du signal sonore issu des cordes vocales, tout en réduisant de manière importante les perturbations mécaniques dues aux bruits aériens parasites.The
Les moyens de découplage acoustique entre le microphone 4 et le module 6 permettent de limiter une perturbation mécanique du microphone 4 par le module acoustique 6, lors de la réception du signal sonore. Inversement, les moyens de découplage permettent également, de par la forme évasée de l'écartement entre les bras 18 de liaison et du microphone 4 vers le module acoustique 6, une atténuation importante des ondes vibratoires mécaniques se propageant à partir du microphone 4 en direction du module acoustique 6. Les moyens de découplage acoustique limitent donc fortement les perturbations réciproques entre le microphone 4 et le module acoustique 6 correspondant.The acoustic decoupling means between the
Le dispositif acoustique 2 selon l'invention permet ainsi d'obtenir une bonne réception du signal sonore issu des cordes vocales et une bonne transmission d'ondes vibratoires au nerf auditif par conduction osseuse.The
L'arceau supérieur 8 permet, de par sa faible épaisseur et sa matière souple, le port d'un casque lourd sans gêne sur le dessus de la tête. L'arceau arrière 10, étant positionné sous l'os du rocher derrière la tête, permet également le port de tous les casques lourds de combat.The
Le maintien mécanique du microphone 4 et des deux modules 6 est assuré par l'arceau arrière 10, alors que l'arceau supérieur 8 a un rôle de maintien en position sur le dessus de la tête.The mechanical support of the
Selon un autre mode de réalisation, le transducteur du microphone de contact est renfermé dans une enveloppe de protection en caoutchouc, l'enveloppe de protection étant elle-même fixée dans la première cavité intérieure du boîtier du microphone de contact. La paroi d'appui est venue de matière avec l'enveloppe de protection.According to another embodiment, the transducer of the contact microphone is enclosed in a rubber protective casing, the protective casing being itself fixed in the first internal cavity of the housing of the contact microphone. The support wall is integral with the protective envelope.
Selon un autre mode de réalisation, le dispositif acoustique 2 ne comprend pas de module acoustique.According to another embodiment, the
Selon d'autres modes de réalisation, le dispositif acoustique 2 est apte à être utilisé avec un casque le motard, un casque pour pilote de véhicule automobile, un casque pour véhicule blindé, un casque de pompier, un casque pour agent de sécurité, un casque de chantier, un casque pour pilote d'aéronef.According to other embodiments, the
Selon d'autres modes de réalisation, le dispositif acoustique 2 est un casque pour standardiste.According to other embodiments, the
Claims (15)
- An acoustic device (2) of the type comprising an acoustic contact microphone (4) and an arch (10) for keeping the microphone (4) bearing against a side of the skull, said microphone (4) including a case (16) and a transducer (14) for mechanically stimulating bone arranged in the case (16), said transducer (14) being able to receive a sound signal from the vocal cords by bone conduction, said case (16) including a wall (20) bearing on a zone of the cheek, characterized in that the wall (20) in contact with the transducer (14) of the microphone (4) has a hardness comprised between 45 and 85 shores A and a thickness comprised between 0.4 and 0.6 mm.
- The acoustic device (2) according to claim 1, characterized in that the hardness of the wall (20) is comprised between 55 and 80 shores A.
- The acoustic device according to claim 1 or 2, characterized in the wall is integral with a protective enclosure of the transducer of the contact microphone.
- The acoustic device (2) according to any one of the preceding claims, characterized in that the transducer (14) of the contact microphone (4) is an accelerometer.
- The acoustic device (2) according to any one of the preceding claims, characterized in that the transducer (14) of the contact microphone is immobilized in the case (16).
- The acoustic device (2) according to any one of the preceding claims, characterized in that the case (16) includes a mass (22) protecting the transducer (14) of the contact microphone (4), on the side opposite the bearing wall (20).
- The acoustic device (2) according to any one of the preceding claims, characterized in that the case (16) is made from synthetic rubber.
- The acoustic device (2) according to any one of the preceding claims, characterized in that the acoustic microphone (4) is able to bear on the mandible bone, also called lower maxillary bone.
- The acoustic device (2) according to any one of the preceding claims, characterized in that it comprises two side acoustic modules (6) bearing on the sides of the skull and able to transmit a sound signal to the auditory nerve.
- The acoustic device (2) according to claim 9, characterized in that the side acoustic modules (6) each include a mechanical bone excitation transducer able to transmit a sound signal to the auditory nerve by bone conduction, and are connected to one another by a connecting arch (8, 10).
- The acoustic device (2) according to claim 9 or 10, characterized in that the microphone (4) is connected to a corresponding acoustic module (6), and in that the device includes acoustic uncoupling means (18) between the microphone (4) and the module (6) to which the microphone (4) is connected.
- The acoustic device (2) according to claim 11, characterized in that the microphone (4) is connected to the corresponding acoustic module (6) by two connecting arms (18), and in that the separation between the outer edges (28), across from one another, of the two connecting arms (18) increases gradually from the microphone (4) toward the acoustic module (6), in order to allow an attenuation of the mechanical sound waves propagating from the microphone (4) toward the corresponding acoustic module (6).
- The acoustic device (2) according to claim 11 or 12, characterized in that the microphone (4) is connected to the corresponding acoustic module (6) by two connecting arms (18), and in that the separation between the outer edges (29), across from one another, of the two connecting arms (18) increases gradually from the microphone (4) toward the acoustic module (6), in order to allow an attenuation of the mechanical sound waves propagating from the microphone (4) toward the corresponding acoustic module (6).
- The acoustic device (2) according to any one of the preceding claims, characterized in that it is, due to its dimensions, able to be used with a heavy infantry helmet or with a chemical bacteriological nuclear mask.
- Head equipment for an operator comprising a protective helmet, characterized in that it includes an acoustic device (2) according to any one of the preceding claims.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0953398A FR2945905B1 (en) | 2009-05-20 | 2009-05-20 | ACOUSTIC DEVICE |
PCT/FR2010/050969 WO2010133807A1 (en) | 2009-05-20 | 2010-05-19 | Acoustic device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2433431A1 EP2433431A1 (en) | 2012-03-28 |
EP2433431B1 true EP2433431B1 (en) | 2018-09-12 |
Family
ID=41467089
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10728788.0A Active EP2433431B1 (en) | 2009-05-20 | 2010-05-19 | Acoustic device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2433431B1 (en) |
ES (1) | ES2704450T3 (en) |
FR (1) | FR2945905B1 (en) |
WO (1) | WO2010133807A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8983096B2 (en) * | 2012-09-10 | 2015-03-17 | Apple Inc. | Bone-conduction pickup transducer for microphonic applications |
FR3019422B1 (en) | 2014-03-25 | 2017-07-21 | Elno | ACOUSTICAL APPARATUS COMPRISING AT LEAST ONE ELECTROACOUSTIC MICROPHONE, A OSTEOPHONIC MICROPHONE AND MEANS FOR CALCULATING A CORRECTED SIGNAL, AND ASSOCIATED HEAD EQUIPMENT |
EP3613216A4 (en) * | 2017-04-23 | 2020-12-02 | Audio Zoom Pte Ltd | Transducer apparatus for high speech intelligibility in noisy environments |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0321617D0 (en) * | 2003-09-10 | 2003-10-15 | New Transducers Ltd | Audio apparatus |
JP4702795B2 (en) * | 2004-01-09 | 2011-06-15 | 国立大学法人 奈良先端科学技術大学院大学 | Body conduction sound microphone, signal processing device, communication interface system, sound collection method |
JP4861079B2 (en) * | 2006-07-10 | 2012-01-25 | Necトーキン株式会社 | Bone conduction receiver |
GB0710378D0 (en) * | 2007-05-31 | 2007-07-11 | New Transducers Ltd | Audio apparatus |
FR2922075B1 (en) * | 2007-10-09 | 2011-07-22 | Elno Soc Nouvelle | ACOUSTIC HELMET |
-
2009
- 2009-05-20 FR FR0953398A patent/FR2945905B1/en not_active Expired - Fee Related
-
2010
- 2010-05-19 WO PCT/FR2010/050969 patent/WO2010133807A1/en active Application Filing
- 2010-05-19 ES ES10728788T patent/ES2704450T3/en active Active
- 2010-05-19 EP EP10728788.0A patent/EP2433431B1/en active Active
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
FR2945905B1 (en) | 2011-07-29 |
WO2010133807A1 (en) | 2010-11-25 |
ES2704450T3 (en) | 2019-03-18 |
FR2945905A1 (en) | 2010-11-26 |
EP2433431A1 (en) | 2012-03-28 |
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