EP2433431B1 - Akustische vorrichtung - Google Patents

Akustische vorrichtung Download PDF

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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
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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.)
Active
Application number
EP10728788.0A
Other languages
English (en)
French (fr)
Other versions
EP2433431A1 (de
Inventor
Patrick Robuchon
Christophe Made
Monique Mitte
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Electronics and Defense SAS
Elno SAS
Original Assignee
Safran Electronics and Defense SAS
Elno SAS
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Publication of EP2433431A1 publication Critical patent/EP2433431A1/de
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • 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
    • 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)

Claims (15)

  1. Akustische Einrichtung (2), umfassend ein akustisches Kontaktmikrofon (4) und einen Bügel (10), um das Mikrofon (4) in Kontakt mit einer Seitenfläche des Schädels zu halten, wobei das Mikrofon (4) ein Gehäuse (16) und einen im Gehäuse (16) angeordneten Transducer (14) mit mechanischer Knochenerregung, wobei der Transducer (14) dazu geeignet ist, durch Knochenleitung ein von den Stimmbändern herrührendes Schallsignal zu empfangen, wobei das Gehäuse (16) eine Wand (20) zur Auflage auf einen Teil der Wange umfasst, dadurch gekennzeichnet, dass die Wand (20) im Kontakt mit dem Transducer (14) des Mikrofons (4) eine Härte zwischen 45 und 85 Shore A und eine Dicke zwischen 0,4 und 0,6 mm aufweist.
  2. Akustische Einrichtung (2) nach Anspruch 1, dadurch gekennzeichnet, dass die Härte der Wand (20) zwischen 55 und 80 Shore A liegt.
  3. Akustische Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Wand aus demselben Material besteht wie eine Schutzhülle des Transducers des Kontaktmikrofons.
  4. Akustische Einrichtung (2) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Transducer (14) des Kontaktmikrofons (4) ein Beschleunigungsmesser ist.
  5. Akustische Einrichtung (2) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Transducer (14) des Kontaktmikrofons im Gehäuse (16) immobilisiert ist.
  6. Akustische Einrichtung (2) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Gehäuse (16) eine Schutzmasse (22) für den Transducer (14) des Kontaktmikrofons (4) auf der der Auflagewand (20) gegenüberliegenden Seite umfasst.
  7. Akustische Einrichtung (2) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Gehäuse (16) aus synthetischem Kautschuk besteht.
  8. Akustische Einrichtung (2) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das akustische Mikrofon (4) dazu geeignet ist, auf dem Unterkiefer - auch Mandibula genannt - aufzuliegen.
  9. Akustische Einrichtung (2) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass sie zwei auf den Seitenflächen des Schädels aufliegende seitliche Akustikmodule (6) umfasst, die zum Senden eines Schallsignals an den Hörnerv geeignet sind.
  10. Akustische Einrichtung (2) nach Anspruch 9, dadurch gekennzeichnet, dass die seitlichen Akustikmodule (6) jeweils einen Transducer mit mechanischer Knochenerregung umfassen, der dazu geeignet ist, über Knochenleitung ein Schallsignal an den Hörnerv zu senden, und über mindestens einen Verbindungsbügel (8, 10) miteinander verbunden sind.
  11. Akustische Einrichtung (2) nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass das Mikrofon (4) mit einem entsprechenden Akustikmodul (6) verbunden ist, und dass die Einrichtung Mittel (18) zur Schallentkopplung zwischen dem Mikrofon (4) und dem Modul (6), mit dem das Mikrofon (4) verbunden ist, umfasst.
  12. Akustische Einrichtung (2) nach Anspruch 11, dadurch gekennzeichnet, dass das Mikrofon (4) über zwei Verbindungsarme (18) mit dem entsprechenden Akustikmodul (6) verbunden ist, und dass der Abstand zwischen den einander gegenüberliegenden Außenrändern (28) der beiden Verbindungsarme (18) vom Mikrofon (4) zum Akustikmodul (6) immer größer wird, um eine Dämpfung der vom Mikrofon (4) in Richtung des entsprechenden Akustikmoduls (6) ausbreitenden mechanischen Schallwellen zu ermöglichen.
  13. Akustische Einrichtung (2) nach Anspruch 11 oder 12, dadurch gekennzeichnet, dass das Mikrofon (4) über zwei Verbindungsarme (18) mit dem entsprechenden Akustikmodul (6) verbunden ist, und dass der Abstand zwischen den einander gegenüberliegenden Außenrändern (29) der beiden Verbindungsarme (18) vom Mikrofon (4) zum Akustikmodul (6) immer größer wird, um eine Dämpfung der vom Mikrofon (4) in Richtung des entsprechenden Akustikmoduls (6) ausbreitenden mechanischen Schallwellen zu ermöglichen.
  14. Akustische Einrichtung (2) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass sie aufgrund ihrer Abmessungen zur Verwendung mit einem schweren Infanteriehelm oder einer ABC-Schutzmaske geeignet ist.
  15. Kopfausrüstung für einen Bediener, umfassend einen Schutzhelm, dadurch gekennzeichnet, dass sie eine akustische Einrichtung (2) nach einem der vorstehenden Ansprüche umfasst.
EP10728788.0A 2009-05-20 2010-05-19 Akustische vorrichtung Active EP2433431B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0953398A FR2945905B1 (fr) 2009-05-20 2009-05-20 Dispositif acoustique
PCT/FR2010/050969 WO2010133807A1 (fr) 2009-05-20 2010-05-19 Dispositif acoustique

Publications (2)

Publication Number Publication Date
EP2433431A1 EP2433431A1 (de) 2012-03-28
EP2433431B1 true EP2433431B1 (de) 2018-09-12

Family

ID=41467089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10728788.0A Active EP2433431B1 (de) 2009-05-20 2010-05-19 Akustische vorrichtung

Country Status (4)

Country Link
EP (1) EP2433431B1 (de)
ES (1) ES2704450T3 (de)
FR (1) FR2945905B1 (de)
WO (1) WO2010133807A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
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 (fr) 2014-03-25 2017-07-21 Elno Appareil acoustique comprenant au moins un microphone electroacoustique, un microphone osteophonique et des moyens de calcul d'un signal corrige, et equipement de tete associe
WO2018199846A1 (en) * 2017-04-23 2018-11-01 Audio Zoom Pte Ltd Transducer apparatus for high speech intelligibility in noisy environments

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0321617D0 (en) * 2003-09-10 2003-10-15 New Transducers Ltd Audio apparatus
WO2005067340A1 (ja) * 2004-01-09 2005-07-21 Asahi Kasei Kabushiki Kaisha 体内伝導音マイクロフォン、信号処理装置、コミュニケーションインタフェースシステム、採音方法
JP4861079B2 (ja) * 2006-07-10 2012-01-25 Ｎｅｃトーキン株式会社 骨伝導レシーバ
GB0710378D0 (en) * 2007-05-31 2007-07-11 New Transducers Ltd Audio apparatus
FR2922075B1 (fr) * 2007-10-09 2011-07-22 Elno Soc Nouvelle Casque acoustique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
FR2945905A1 (fr) 2010-11-26
EP2433431A1 (de) 2012-03-28
FR2945905B1 (fr) 2011-07-29
WO2010133807A1 (fr) 2010-11-25
ES2704450T3 (es) 2019-03-18

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