WO1994007342A1 - Microphone de conduction osseuse a accelerometrie - Google Patents

Microphone de conduction osseuse a accelerometrie Download PDF

Info

Publication number
WO1994007342A1
WO1994007342A1 PCT/US1993/008660 US9308660W WO9407342A1 WO 1994007342 A1 WO1994007342 A1 WO 1994007342A1 US 9308660 W US9308660 W US 9308660W WO 9407342 A1 WO9407342 A1 WO 9407342A1
Authority
WO
WIPO (PCT)
Prior art keywords
bar
chamber
housing
axis
microphone
Prior art date
Application number
PCT/US1993/008660
Other languages
English (en)
Inventor
Timothy K. Wickstrom
Elmer V. Carlson
Original Assignee
Knowles Electronics, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Knowles Electronics, Inc. filed Critical Knowles Electronics, Inc.
Priority to AU49207/93A priority Critical patent/AU4920793A/en
Publication of WO1994007342A1 publication Critical patent/WO1994007342A1/fr

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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
    • H04R1/46—Special adaptations for use as contact microphones, e.g. on musical instrument, on stethoscope
    • 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

Definitions

  • the technical field of the invention is elec- troacoustical transducers, and in particular, acceleration-sensitive transducers.
  • Background of the Invention Transducer assemblies are known which can be plugged into a user's ear, and which contain both an audible pick-up microphone, for detecting voice sounds generated by the user, and an earphone (or receiver) for generating sounds for the user to hear.
  • One reason for incorporating the microphone into the earpiece is to confer immunity from am- bient noise sources, as well as to eliminate the need for a microphone disposed at the user's mouth.
  • Such microphones are not of the conventional pres ⁇ sure-sensitive type, but are acceleration-sensitive units which pick up the vibration of the user's voice as transmitted through the bones of the user's skull.
  • Suitable circuitry and interconnect cabling connect the earphone and receiver transducers to a local communication unit, e.g. a two-way radio transmitter/receiver.
  • a local communication unit e.g. a two-way radio transmitter/receiver.
  • a representative transducer assembly of this type is described in U.S. Patent No. 4,588,867 issued to Konomi on May 13, 1986.
  • a problem with such units is that since the icro- phone is acceleration-sensitive, the microphone responds to accelerations caused not only by sound waves from the skull, but also to accelerations caused simply by movement of the cabling. It is thus desirable to eliminate cabling entirely for this reason.
  • a miniature transmitter-receiver be incorporated into the transducer assembly to provide short-range communi ⁇ cation to the local transmitter-receiver. This in turn has put a premium on available space in the transducer assembly, since sufficient volume must be provided to accommodate necessary electrical components.
  • a satisfactory microphone could be made substantially shorter in dimension than current state-of-the-art microphones such as the microphones incorporated into earpiece assem ⁇ blies manufactured by Temco Japan Co. , Ltd. of Tokyo for their "Voice-Ducer" units.
  • These micro- phones are elongated structures occupying a volume of approximately 12 millimeters by 4 millimeters by 4 millimeters.
  • These units are configured as an extended piezoelectric bar cantilever mounted at one end, and having appropriate metallizations on opposite sides of the bar across which a signal is developed when the bar mounting system is accele ⁇ rated by vibratory excitation.
  • the microphone comprises a housing having an elongated interior chamber extending along a longitudinal axis.
  • An elongated piezoelectric bar is disposed within the chamber to extend along this longitudinal axis.
  • the bar has conducting electrode surfaces on opposing side faces.
  • Mounting means are provided for mounting one end of the bar to the housing so that the bar is supported as a cantilever beam which will be deflected by acceleration of the housing.
  • a weight configured as a block elongated along an axis of elongation, is affixed to the other end of the bar with its axis of elongation disposed trans ⁇ verse to the chamber axis.
  • the bar and block thus form a T-shaped structure with the mass of the block disposed at the free end of the cantilevered bar.
  • the chamber is generally rectangular, and the block is configured to extend substantially the entire width of the chamber so as to place maximum possible mass at the extreme end of the cantile ⁇ vered bar.
  • the secured end of the piezoelectric bar is secured to a circuit board affixed to the housing and has a portion extending through an aperture carrying a pair of electrical terminals disposed for external access.
  • Elements of an impedance shifting circuit are mounted on an interior portion of the circuit board and are connected between the electrode surfaces and the terminals.
  • the imped ⁇ ance shifting elements preferably include a resis ⁇ tor connected between the electrode surfaces, a field effect transistor having its gate electrode connected to one of electrode surfaces, its source electrode connected to one of the other electrode surface and one of the terminals, the drain elec ⁇ trode being connected to the other of the termi ⁇ nals.
  • Figure 1 is a plan view of a microphone assem ⁇ bly of the present invention with a portion of its housing removed;
  • Figure 2 is a cutaway view taken along section lines 2-2 as shown in Figure 1;
  • Figure 3 illustrates elements of an impedance shifting circuit shown in Figure 1 connected to a test circuit.
  • FIGS l and 2 show cutaway plan and side elevational views of the microphone assembly 10 of the invention, the assembly 10 has a housing 12 made of upper and lower housing shells 14, 16.
  • the housing 12 is rectangular and generally elongated.
  • a passage 18 is disposed at one end of the housing, and a circuit board 20 is affixed to the lower housing shell 16 by epoxy cement 22 to secure the circuit board 20 in place extending partially into the interior of the housing 12.
  • a piezoelectric bar 24 of square cross-section is secured at one end to the circuit board 20 by conducting epoxy cement 23.
  • this conducting epoxy cement 23 not only firmly supports this end of the bar 24, but also makes contact to an appro ⁇ priate metallization interconnecting certain cir ⁇ cuit elements on the circuit board 20.
  • the bar 24 extends generally parallel to the axis of elongation of the housing 12.
  • a generally rectangular weight 26 is affixed.
  • the weight 26 is configured as an elongated block of length much greater than the transverse dimensions of the piezoelectric bar 24, with its axis of elongation perpendicular to that of the piezoelectric bar 24 and the planes of the respective housing confronting sidewalls 28, 30.
  • the piezoelectric bar 24 and the weight 26 thus form a T-shaped structure placing maximum mass at the extreme end of the bar 24 to increase the sensitivity of the bar 24 to acceleration.
  • Suit ⁇ able upper and lower metallizations disposed upon the piezoelectric bar 24 form upper and lower electrode surfaces 32, 34.
  • FIG. 1 shows the circuitry on the circuit board 20 connected to a test circuit via intercon- nection leads 36, 38.
  • a transducer 40 here sym ⁇ bolically representing the piezoelectric bar 24 and its electrode surfaces 32, 34 provides a signal voltage difference applied to a ground lead 42 and a gate lead 46 accessing the gate of a field effect transistor 48.
  • a source lead 50 returns the source of the transistor 48 to the ground lead 42 and to an output terminal 52.
  • a resistor 54 of from 6 to 10 gigaohms is connected between the gate lead 46 and the ground lead 42.
  • the drain of the transis- tor 48 is connected via a drain lead 56 to an output terminal 58.
  • the remaining portions of the circuit external to the circuit board 20 necessary to achieve an amplifying and impedance-shifting function are connected to the terminals 52, 58 by means of the interconnection leads 36, 38 intercon ⁇ necting these terminals to terminals 60, 62.
  • Terminal 60 is connected to an output terminal 64 via a capacitor 66 and to one end of a resistor 68.
  • the capacitor 66 is given a nominal value of 10 microfarads and the resistor a value of 2.2 kilohms.
  • the other end of the resistor is connec ⁇ ted via a battery 70 of nominal voltage of 3 volts to the terminal 62, and to an output terminal 72.
  • the lower electrode surface 34 of the piezoelectric bar 24 contacts and is supported by a gate metallization 74 connected to the gate electrode of the transistor 48, and thus serves the function of the gate lead 46 shown in Figure 3.
  • a ribbon-shaped foil 76 is secured by conducting epoxy cement to the upper electrode surface 34 of the piezoelectric bar 34, and is similarly secured to a ground metallization 78 con ⁇ nected to terminal 52.
  • a portion of the foil lead 76 not shown in the drawings is connected to the housing 12 to minimize circuit noise.
  • a source lead 80 is stitch-bonded from the transistor 48 to an extension of the ground metallization 78, these elements serving the function of ground lead 42 in Figure 3.
  • drain lead 82 of transistor 48 is stitch-bonded to metallization 86 to which terminal 58 is connected, thereby serving the function of the drain lead 56 shown in Figure 3.
  • the resistor 54 of Figure 3 as shown in Figure 1 is a planar resistance element extending from metallizations 74 to 78.
  • the elements shown in Figures 1 and 2 are illustrated approximately to scale.
  • the housing 12 employed for test and evaluation purposes is that of a standard transducer housing. It clearly has not been optimized for minimum housing volume.
  • the case width is 0.154 inches (3.90 mm.).
  • the length of the housing 12 is 0.270 inches (6.93 mm.). This dimension may be reduced to 0.233 inches (5.91 mm.).
  • the height of the housing 12 is 0.119 inches (3.03 mm.); a value which may be reduced to 0.107 inches (2.90 mm.).
  • the piezoelectric bar 24 has an unsupported length of 0.172 inches (4.30 mm.). Its cross-section dimensions are 0.020 inches (0.51 mm.) and 0.019 inches (0.48 mm.).
  • the piezoelec- trie bar 24 is made of a ceramic manufactured by Piezoelectric Products, Inc. of Metuchen, New Jersey under the trade name "PZT".
  • the weight 26 is made of lead and has an overall length of 0.19 inches (3.03 mm.), a major transverse dimension of 0.055 inches (1.38 mm.), a minor transverse dimen- sion of 0.025 inches (0.62 mm.), and a weight of 29 milligrams.
  • the transverse dimensions of the microphone assembly 10 are comparable with those of the previ- ously mentioned Temco unit; however, the overall length is approximately half that of the Temco unit. Thus, a significant volume has been freed to accommodate additional electronics.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

Un microphone de conduction osseuse du type à accélération destiné à être placé dans l'oreille de l'utilisateur, utilise une barre piézo-électrique montée en porte à faux présentant une couche de métallisation de chaque côté. Un poids allongé est fixé à une extrémité libre de la barre, transversalement par rapport à celle-ci de manière à former une structure en T dont la masse principale est concentrée à l'extrémité finale de la barre piézo-électrique. Grâce à un boîtier ajusté, cet ensemble microphone occupe un volume d'environ 4 mm par 6 mm par 3 mm. Les équipements électroniques associés sont montés dans le boîtier à partir duquel font saillie des bornes de contact.
PCT/US1993/008660 1992-09-17 1993-09-14 Microphone de conduction osseuse a accelerometrie WO1994007342A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU49207/93A AU4920793A (en) 1992-09-17 1993-09-14 Bone conduction accelerometer microphone

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US94638592A 1992-09-17 1992-09-17
US07/946,385 1992-09-17

Publications (1)

Publication Number Publication Date
WO1994007342A1 true WO1994007342A1 (fr) 1994-03-31

Family

ID=25484394

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/008660 WO1994007342A1 (fr) 1992-09-17 1993-09-14 Microphone de conduction osseuse a accelerometrie

Country Status (2)

Country Link
AU (1) AU4920793A (fr)
WO (1) WO1994007342A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2730891A1 (fr) * 1995-02-22 1996-08-23 Gallet Sa Dispositif de communication du type electroacoustique
WO1999039543A1 (fr) * 1998-01-29 1999-08-05 Emf Acoustics Oy Ltd. Unite de transduction de vibrations
NL1011639C2 (nl) * 1998-03-30 2004-03-23 Knowles Electronics Inc Miniatuur omvormer.
KR100873094B1 (ko) * 2006-12-29 2008-12-09 한국표준과학연구원 가속도계를 이용한 넥 마이크로폰
WO2010045358A1 (fr) * 2008-10-14 2010-04-22 Cochlear Americas Prothèse auditive implantable
US9401158B1 (en) 2015-09-14 2016-07-26 Knowles Electronics, Llc Microphone signal fusion
US9779716B2 (en) 2015-12-30 2017-10-03 Knowles Electronics, Llc Occlusion reduction and active noise reduction based on seal quality
CN107277723A (zh) * 2017-07-05 2017-10-20 杭州双弯月电子科技有限公司 一种可自动检测运动状态的压电陶瓷骨传导麦克风
US9812149B2 (en) 2016-01-28 2017-11-07 Knowles Electronics, Llc Methods and systems for providing consistency in noise reduction during speech and non-speech periods
US9830930B2 (en) 2015-12-30 2017-11-28 Knowles Electronics, Llc Voice-enhanced awareness mode
CN113141565A (zh) * 2020-01-17 2021-07-20 深圳市韶音科技有限公司 一种传声器装置
WO2022141827A1 (fr) * 2020-12-31 2022-07-07 深圳市韶音科技有限公司 Dispositif de transmission de son à conduction osseuse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4150262A (en) * 1974-11-18 1979-04-17 Hiroshi Ono Piezoelectric bone conductive in ear voice sounds transmitting and receiving apparatus
US4214215A (en) * 1978-08-02 1980-07-22 Contact Communication Corporation Low noise-high gain JFET amplifier for a piezoelectric transducer
JPS5944196A (ja) * 1982-09-06 1984-03-12 Pilot Pen Co Ltd:The 骨伝導振動ピツクアツプ型マイクロホン
JPH01272294A (ja) * 1988-04-22 1989-10-31 Murata Mfg Co Ltd 骨導マイクロホン

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4150262A (en) * 1974-11-18 1979-04-17 Hiroshi Ono Piezoelectric bone conductive in ear voice sounds transmitting and receiving apparatus
US4214215A (en) * 1978-08-02 1980-07-22 Contact Communication Corporation Low noise-high gain JFET amplifier for a piezoelectric transducer
JPS5944196A (ja) * 1982-09-06 1984-03-12 Pilot Pen Co Ltd:The 骨伝導振動ピツクアツプ型マイクロホン
JPH01272294A (ja) * 1988-04-22 1989-10-31 Murata Mfg Co Ltd 骨導マイクロホン

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 41 (E - 879) 25 January 1990 (1990-01-25) *
PATENT ABSTRACTS OF JAPAN vol. 8, no. 135 (E - 252) 22 June 1984 (1984-06-22) *

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2730891A1 (fr) * 1995-02-22 1996-08-23 Gallet Sa Dispositif de communication du type electroacoustique
WO1996026623A1 (fr) * 1995-02-22 1996-08-29 Gallet S.A. Dispositif de communication du type electroacoustique
WO1999039543A1 (fr) * 1998-01-29 1999-08-05 Emf Acoustics Oy Ltd. Unite de transduction de vibrations
US6336367B1 (en) 1998-01-29 2002-01-08 B-Band Oy Vibration transducer unit
NL1011639C2 (nl) * 1998-03-30 2004-03-23 Knowles Electronics Inc Miniatuur omvormer.
KR100873094B1 (ko) * 2006-12-29 2008-12-09 한국표준과학연구원 가속도계를 이용한 넥 마이크로폰
US10485973B2 (en) 2008-10-14 2019-11-26 Cochlear Limited Implantable hearing prosthesis
CN102215796A (zh) * 2008-10-14 2011-10-12 耳蜗有限公司 植入式听力假体
CN102215796B (zh) * 2008-10-14 2014-10-29 耳蜗有限公司 植入式听力假体
WO2010045358A1 (fr) * 2008-10-14 2010-04-22 Cochlear Americas Prothèse auditive implantable
US9401158B1 (en) 2015-09-14 2016-07-26 Knowles Electronics, Llc Microphone signal fusion
US9961443B2 (en) 2015-09-14 2018-05-01 Knowles Electronics, Llc Microphone signal fusion
US9830930B2 (en) 2015-12-30 2017-11-28 Knowles Electronics, Llc Voice-enhanced awareness mode
US9779716B2 (en) 2015-12-30 2017-10-03 Knowles Electronics, Llc Occlusion reduction and active noise reduction based on seal quality
US9812149B2 (en) 2016-01-28 2017-11-07 Knowles Electronics, Llc Methods and systems for providing consistency in noise reduction during speech and non-speech periods
CN107277723A (zh) * 2017-07-05 2017-10-20 杭州双弯月电子科技有限公司 一种可自动检测运动状态的压电陶瓷骨传导麦克风
CN113141565A (zh) * 2020-01-17 2021-07-20 深圳市韶音科技有限公司 一种传声器装置
CN113141565B (zh) * 2020-01-17 2024-08-13 深圳市韶音科技有限公司 一种传声器装置
US12114129B2 (en) 2020-01-17 2024-10-08 Shenzhen Shokz Co., Ltd. Bone conduction microphone
WO2022141827A1 (fr) * 2020-12-31 2022-07-07 深圳市韶音科技有限公司 Dispositif de transmission de son à conduction osseuse

Also Published As

Publication number Publication date
AU4920793A (en) 1994-04-12

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