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Publication numberUS3787641 A
Publication typeGrant
Publication dateJan 22, 1974
Filing dateJun 5, 1972
Priority dateJun 5, 1972
Publication numberUS 3787641 A, US 3787641A, US-A-3787641, US3787641 A, US3787641A
InventorsSantori C
Original AssigneeSetcom Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Bone conduction microphone assembly
US 3787641 A
Abstract
A bone conduction microphone assembly with a transducer mounted in a transducer mount supported from a surrounding support member by spring means which yieldably urges the transducer mount against the user's head with predetermined pressure.
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Description  (OCR text may contain errors)

United States Patent (191 Santori in] 3,787,641 14 Jan. 22, 1974 [5 1 BONE CONDUCT-ION MICROPHONE ASSEMBLY [75] Inventor: Charles M. Santori, San Jose, Calif.

[73] Assignee: I Setcom Corporation, San Jose, Calif.

[22] Filed: June 5, 1972 21 Appl. NO.: 259,489

s2 U.S.Cl. 179/107 BC, l79/1 56R [51] Int. Cl H041 25/00 [58] Field of Search.. 179/107 BC, 108, 1 MF, 156,

[5 6 References Cited I UNITED STATES PATENTS 2,942,072 6/l960- Cunningham 179/156R Primary ExaminerRalph D. Blakeslee v Attorney, Agent, or Firm-Flehr, Hohbach, Test, Al-

' brittOn & Herbert '[57 ABSTRACT A bone conduction microphone assembly with a transducer mounted in a transducer mount supported from a surrounding support member by spring means which yieldably urges the transducer mount against the users head with predetermined pressure.

7 Claims, 6 Drawing Figures PATENIED JAN 22 I974 SHEEI 1 0F 3 PAIENIEBJAN 22 m4 SHEEI 2 0F 3 VINYL COVER WITH VELCRO TABS DAMPING (FOAM) PAD MIKE MOUNT COVER TRANSDUCER 8x 27 CABLE MOUNT E K M m S A B PATENTEUJANZZIQM MEI 3 I 3 nu um Ill 1 ixe ditions.

BONE CONDUCTION MICROPHONE ASSEMBLY BACKGROUND OF THE INVENTION This invention relates generally to a bone conduction microphone assembly and more particularly to a bone conduction microphone assembly suitable for use in a variety of head gear.

Bone conduction microphones operate from energy generated by auditory vibrations of the bones in the head. The microphone transducer is generally a sensitive, low mass accelerometer in intimate contact with the head to pick up the bone vibrations and generate output signals responsive to the auditory vibrations. In many applications the microphone is used by persons who require the use of both hands and in relatively noisy environments. Normally, in such environment the microphone is used in conjunction with some type of head gear such as industrial hard hats, fire, motorcycle, riot and police helmets.

Prior art microphones have serious limitations in such applications. They are adversely affected by ambient noise transmitted through the air or through the head gear from which they are supported. Their size and shape make it difficult and often impossible to mount the transducers in'the head gear and so in many instances, when mounted, render the head gear uncomfortable. In some instances, transducers mounted in the head gear are hazardous in that a hard blow to the head gear may drive the transducer into the head and cause injury. The audio quality is, in general, poor because the transducer is not held in intimate contact with the head with sufficient pressure to pick up high frequency vibrations whereby high frequency sound is not effectively reproduced.

OBJECTS AND SUMMARY OF THE INVENTION It is a general object of the present invention to provide an improved bone conduction microphone assembly which can operate in very high ambient noise con- It is another object of the present invention to provide a bone conduction microphone assembly in which the microphone mount is yieldably pressed against the head with predetermined force .to give a satisfactory consistent pressure whereby the microphone operates effectively over a broad frequency spectrum.

It is another object of the present invention to provide a bone conduction microphone assembly with improved'protection against possible injury by the transducer under impact forces.

It is still a further object of the present invention to provide a bone conduction microphone assembly which is readily adapted to fit a variety of head gear which can be comfortably worn by the user.

The foregoing and other objects of the invention are achieved by a bone conduction microphone assembly which includes an acceleration sensitive transducer, a transducer mount adapted to receive and hold said transducer, a support structure including a hole for receiving the transducer mount to surround and be spaced therefrom, and spring means cooperating between said transducer mount and said support to yieldably urge the transducer against the head of the user with predetermined pressure when the support rests on the head of the user.

BRIEF DESCRIPTION OF THE DRAWING FIG. I is a side view partly in section showing the bone conduction microphone assembly in use with a helmet.

FIG. 2 is a view taken along the line 2-2 of FIG. 1 showing the bone conduction microphone assembly held by the helmet suspension straps. 7

FIG. 3 is an exploded view of the bone conduction microphone assembly shown in FIGS. 1 and 2.

FIG. 4 is a sectional elevational view, of the bone conduction microphone assembly.

FIG. 5 shows the bone conduction microphone applied to the head surface.

FIG. 6 is a perspective view of another embodiment of the bone conduction microphone assembly of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The bone conduction microphone assembly of the present invention is particularly suitable for use in head gear such as industrial hard hats, tire, motorcycle, riot and police helmets. Referring to FIG. I, a user 11 is shown wearingva protective helmet 12. The helmet includes a headband l3 and suspension straps which hold the helmet on the head of the user with the protective portion of the helmet spaced from the head. The straps 14 extend upwardly from the headband l3 and engage a loop 16, FIG. 2. The loop 16 is, in turn, sandwiched between Velcro tabs 17 more clearly shown in FIG. 4,

17a and 17b.

Referring particularly to FIG. 3,. the bone conduction microphone assembly includes a transducer support 21 which includes a central hole or opening 22. A transducer mount 23 is disposed within and spaced from said opening whereby the transducer support 21 surrounds and is spaced from the transducer mount. A plurality of radially extending spring members 24 are adapted to support the transducer mount from the surrounding transducer support. As will be more clearly described, the springs 24 serve to yieldably urge the transducer mount against the head of a wearer to provide intimatecontact wherebythe transducer mount can effectivelypick up the bone vibrations. The transducer and mount are, therefore, isolated from the main support reducing the noise vibrations which can be transmitted through the support. a I

The transducer mount includes a well 26 adapted to receive and hold the transducer'27. The mount protects and holds the transducer and yet permits the transducer to respond to minute vibrations of the head bones. The transducer 27 is a sensitive low mass accelerometer as, for example, the type manufactured and sold by Knowles Electronics Inc., its Model No. BLI670. Insulated transducer wires 28 extend outwardly from the transducer and are connected to a cable 29. A grommet or other suitable stop 31 is provided on the cable 28. The transducer support member includes a groove or slot 32 adapted to receive the cable with a cross slot 33 adapted to receive the grommet or stop 31 whereby to provide strain relief. The effect of cable vibrations on the transducer is minimized by use of fine transducer wires and by securely attaching the cable to the relatively high mass support member. Y

circling or mounting portion 37 which extends outwardly and has its lower surface coplanar with the lower surface of the transducer support. A damping pad 38 which may, for example, be made of an expanded material, such as Scottfelt, is adapted to surround the support and rest against the upper surface of the mounting member 37. A vinyl cover with Velcro pads 17b secured at spaced points is suitably affixed to the upper surface of the damping pad and to-the upper surface of the microphone cover 36 whereby to provide an assembly of the type more clearly shown in FIG. 4. As a result, the bone conduction microphone assembly including its supporting ring, cover, microphone mount and spring means is held on the helmet loop 16 by the Velcro tabs 17a, 17b and is substantially isolated therefrom by means of the damping afforded by the Velcro tabs and by the damping pad 38. The microphone assembly is effectively isolated from vibrations of the helmet and helmet straps.

Referring particularly to FIG. 4 showing the assem-' bly, it is noted that the lower surface 41 of the transducer mount 23 extends beyond the lower surface 42 of the transducer support member. The transducer mount 23 is held in this extended position by means of the spring members 24. The transducer mount, support and spring members may be formed of the same mate rial, for example rubber, in one molding operation. When the transducer support is mounted on the head surface 42 as shown in FIG. 5, the lower surface 42 of the support rests against the head 43 and the spring members 24 are bent upwardly and provide a yieldable downward force so that the lower surface 41 of the transducer mount rests intimately against the head surface 43 to provide good contact to transfer bone vibrations to the transducer. It has been found that by yieldably urging the transducer mount against the head, good frequency response is obtained.

Referring again to FIG. 4, it is seen that the upper surface 44 of the transducer support cover is spaced above the upper surface 46of the transducer mount to provide a recess. Referring to FIG. showing the transducer mounted on the head of a user, it is seen that the upper surface of the transducer mount, even in its mounted condition, is below the upper surface 44 of the cover 36. In this way, any hard impact to the hat which would otherwise make the, helmet itself strike the microphone transducer will strike the large surface 44 distributing the impact forces over a considerable area and preventing injury to the user.

It is apparent that the bone microphone transducer assembly described can be used with other types of supports 37. Referring to FIG. 6, another embodiment of the bone conduction microphone assembly is shown.

The microphone of this embodiment can be associated with other types of supports.

I claim:

1. A bone conduction microphone assembly comprising an acceleration sensitive transducer, a transducer mount adapted to receive and hold said transducer, a transducer support having an opening larger than said transducer mount for receivingsaid transducer and mount, said support surrounding and spaced from said transducer mount and a plurality of spring means connected between said transducer mount and said transducer support to hold the transducer in said opening and yieldably urge the transducer against the head of a user with predetermined pressure when the transducer support rests against the head of a user.

2. A bone conduction microphone assembly comprising a transducer mount having upper and lower surfaces, a transducer of the type which provides an output responsive acceleration held in said mount, a support having upper and lower surfaces and an opening larger than said transducer mount for receiving said transducer and mount, said support surrounding and spaced from said transducer mount, spring means extending between said transducer mount and support serving to support said transducer mount in said opening with the lower surface of said transducer mount extending beyond the lower surface of said support whereby when the microphone, assembly is placed on a user to pick up bone vibrations the transducer is yieldably urged against the user to move as the associated bones vibrate.

3. A bone conduction microphone assembly as in claim 2 wherein the upper surface of said support is above the upper surface of said transducer mount.

4. A bone conduction microphone as' in claim 1 wherein said support, transducer mount and spring means are formed as a unitary molded assembly.

5. A bone conduction microphone assembly. as in claim 4 wherein said spring means comprises a plurality of narrow radially extending members.

6. A bone conduction microphone assembly as in claim 1 including a mountingassembly cooperating with said support for mounting said assembly to associated head gear.

7. A bone conduction microphone assembly. comprising an acceleration sensitive transducer, a transducer .mount adapted to receive and hold said transducer, a

sandwiched between said spaced mounting members.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2942072 *Jun 17, 1957Jun 21, 1960Gen Dynamics CorpHelmet communication system
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4006318 *Apr 21, 1975Feb 1, 1977Dyna Magnetic Devices, Inc.Inertial microphone system
US4367378 *Aug 5, 1980Jan 4, 1983Jordan Arthur ATelephone and holding band therefor
US4903703 *May 18, 1988Feb 27, 1990Hitachi, Ltd.Conversation device of MR imaging apparatus
US5054079 *Jan 25, 1990Oct 1, 1991Stanton Magnetics, Inc.Bone conduction microphone with mounting means
US5337364 *Nov 28, 1990Aug 9, 1994Canadian Bionic Research Inc.Communication device for transmitting audio information to a user
US5986813 *Aug 22, 1997Nov 16, 1999Olympus Optical Co., Ltd.Head mounted type display apparatus capable of generating or detecting vibrations
US6122389 *Jan 20, 1998Sep 19, 2000Shure IncorporatedFlush mounted directional microphone
US6298249 *Oct 8, 1998Oct 2, 2001Mine Safety Appliances CompanyRadio apparatus head-protective helmet
US6980866 *Dec 5, 2001Dec 27, 2005Cardiac Pacemakers, Inc.Apparatus for sensing cardiac contractile function
US7110743 *Jun 30, 2003Sep 19, 2006Mine Safety Appliances CompanyCommunications device for a protective helmet
US7120477Oct 31, 2003Oct 10, 2006Microsoft CorporationPersonal mobile computing device having antenna microphone and speech detection for improved speech recognition
US7283850Oct 12, 2004Oct 16, 2007Microsoft CorporationMethod and apparatus for multi-sensory speech enhancement on a mobile device
US7310427 *Jul 29, 2003Dec 18, 2007Virginia Commonwealth UniversityRecreational bone conduction audio device, system
US7346504Jun 20, 2005Mar 18, 2008Microsoft CorporationMulti-sensory speech enhancement using a clean speech prior
US7383181Jul 29, 2003Jun 3, 2008Microsoft CorporationMulti-sensory speech detection system
US7406303Sep 16, 2005Jul 29, 2008Microsoft CorporationMulti-sensory speech enhancement using synthesized sensor signal
US7447630Nov 26, 2003Nov 4, 2008Microsoft CorporationMethod and apparatus for multi-sensory speech enhancement
US7499686Feb 24, 2004Mar 3, 2009Microsoft CorporationMethod and apparatus for multi-sensory speech enhancement on a mobile device
US7567838Oct 20, 2005Jul 28, 2009Cardiac Pacemakers, Inc.Method for sensing cardiac contractile function using a lead insertable motion sensor
US7574008Sep 17, 2004Aug 11, 2009Microsoft CorporationMethod and apparatus for multi-sensory speech enhancement
US7664277May 29, 2007Feb 16, 2010Sonitus Medical, Inc.Bone conduction hearing aid devices and methods
US7680656Jun 28, 2005Mar 16, 2010Microsoft CorporationMulti-sensory speech enhancement using a speech-state model
US7682303Oct 2, 2007Mar 23, 2010Sonitus Medical, Inc.Methods and apparatus for transmitting vibrations
US7724911Apr 27, 2007May 25, 2010Sonitus Medical, Inc.Actuator systems for oral-based appliances
US7796769Feb 7, 2007Sep 14, 2010Sonitus Medical, Inc.Methods and apparatus for processing audio signals
US7801319Feb 7, 2007Sep 21, 2010Sonitus Medical, Inc.Methods and apparatus for processing audio signals
US7844064May 29, 2007Nov 30, 2010Sonitus Medical, Inc.Methods and apparatus for transmitting vibrations
US7844070Feb 7, 2007Nov 30, 2010Sonitus Medical, Inc.Methods and apparatus for processing audio signals
US7854698Mar 18, 2010Dec 21, 2010Sonitus Medical, Inc.Methods and apparatus for transmitting vibrations
US7876906Feb 7, 2007Jan 25, 2011Sonitus Medical, Inc.Methods and apparatus for processing audio signals
US7881794Aug 6, 2007Feb 1, 2011Cardiac Pacemakers, Inc.Method and apparatus for determining the coronary sinus vein branch accessed by a coronary sinus lead
US7930178Dec 23, 2005Apr 19, 2011Microsoft CorporationSpeech modeling and enhancement based on magnitude-normalized spectra
US7945068Dec 11, 2008May 17, 2011Sonitus Medical, Inc.Dental bone conduction hearing appliance
US7974845Feb 15, 2008Jul 5, 2011Sonitus Medical, Inc.Stuttering treatment methods and apparatus
US8023676Mar 3, 2008Sep 20, 2011Sonitus Medical, Inc.Systems and methods to provide communication and monitoring of user status
US8150075Jan 20, 2009Apr 3, 2012Sonitus Medical, Inc.Dental bone conduction hearing appliance
US8170242Dec 11, 2008May 1, 2012Sonitus Medical, Inc.Actuator systems for oral-based appliances
US8177705Nov 5, 2010May 15, 2012Sonitus Medical, Inc.Methods and apparatus for transmitting vibrations
US8194875Sep 5, 2003Jun 5, 2012Innotech Pty LtdCommunication apparatus and helmet
US8214026Dec 22, 2010Jul 3, 2012Cardiac Pacemakers, Inc.Method and apparatus for determining the coronary sinus vein branch accessed by a coronary sinus lead
US8224013May 12, 2009Jul 17, 2012Sonitus Medical, Inc.Headset systems and methods
US8233654Aug 25, 2010Jul 31, 2012Sonitus Medical, Inc.Methods and apparatus for processing audio signals
US8254611Dec 11, 2008Aug 28, 2012Sonitus Medical, Inc.Methods and apparatus for transmitting vibrations
US8270637Feb 15, 2008Sep 18, 2012Sonitus Medical, Inc.Headset systems and methods
US8270638Oct 15, 2009Sep 18, 2012Sonitus Medical, Inc.Systems and methods to provide communication, positioning and monitoring of user status
US8291912Aug 20, 2007Oct 23, 2012Sonitus Medical, Inc.Systems for manufacturing oral-based hearing aid appliances
US8358792Dec 23, 2009Jan 22, 2013Sonitus Medical, Inc.Actuator systems for oral-based appliances
US8433080Aug 22, 2007Apr 30, 2013Sonitus Medical, Inc.Bone conduction hearing device with open-ear microphone
US8433083May 16, 2011Apr 30, 2013Sonitus Medical, Inc.Dental bone conduction hearing appliance
US8478390Jun 4, 2012Jul 2, 2013Cardiac Pacemakers, Inc.Method and apparatus for determing the coronary sinus vein branch accessed by a coronary sinus lead
US8585575May 14, 2012Nov 19, 2013Sonitus Medical, Inc.Methods and apparatus for transmitting vibrations
US8588447Jul 17, 2012Nov 19, 2013Sonitus Medical, Inc.Methods and apparatus for transmitting vibrations
US8649535Sep 13, 2012Feb 11, 2014Sonitus Medical, Inc.Actuator systems for oral-based appliances
US8649543Aug 12, 2011Feb 11, 2014Sonitus Medical, Inc.Systems and methods to provide communication and monitoring of user status
US8660278Jun 11, 2012Feb 25, 2014Sonitus Medical, Inc.Headset systems and methods
US8712077Jul 20, 2010Apr 29, 2014Sonitus Medical, Inc.Methods and apparatus for processing audio signals
US8712078Aug 10, 2012Apr 29, 2014Sonitus Medical, Inc.Headset systems and methods
US8795172Dec 7, 2007Aug 5, 2014Sonitus Medical, Inc.Systems and methods to provide two-way communications
CN100502711CJun 25, 2004Jun 24, 2009矿井安全装置公司Communications device for a protective helmet
WO1997025598A1 *Jan 7, 1997Jul 17, 1997Jamal HousniVibration sensor
WO1999037122A1 *Jan 15, 1999Jul 22, 1999Shure BrosFlush mounted uni-directional microphone
WO2004023914A1 *Sep 5, 2003Mar 25, 2004Innotech Pty LtdCommunication apparatus and helmet
WO2005004655A1 *Jun 25, 2004Jan 20, 2005Mine Safety Appliances CoCommunications device for a protective helmet
WO2007028899A2 *Sep 7, 2006Mar 15, 2007Franck Pascal Dominiq PrzysiekDevices for applying an osteophonic communicating apparatus in an equipment worn by a living being
WO2010101683A1 *Jan 28, 2010Sep 10, 2010Illinois Tool Works Inc.Welding helmet audio communication systems and methods with bone conduction transducers
Classifications
U.S. Classification381/151, 381/368
International ClassificationA42B3/30, H04R1/00, A42B3/04, H04R1/14, H04R1/46
Cooperative ClassificationH04R1/14, A42B3/30, H04R1/46
European ClassificationH04R1/46, A42B3/30, H04R1/14