Abstract: Ear-piece type acoustic transducing part is provided with a bone-conducted sound pickup microphone for picking up a bone-conducted sound, a directional microphone for picking up an air-conducted sound and an electro-acoustic transducer for transducing a received speech signal to a received speech sound.

Abstract: An improved mechanism of vibration-type microphone, particularly relating to one that transmits voice signals by means of direct contact with the human body, comprising mainly of a buffer foam rubber, a microphone carrier, a capacitor microphone, a separating piece and an arc shaped vibration inducing plate that are accommodated in sequence in a main unit composed of a top cover and a bottom cover and connected with a fixing device, wherein at the center of the separating piece is a needle hole, at the center of the arc shaped vibration inducing plate is also a voice passage hole, with its edge inserted in the groove reserved between the top and bottom covers, and is clasped between the separating piece and the vibration membrane on the bottom cover, so the center part of the plate and the vibration membrane on the bottom cover form a minute bag shaped air chamber, so that when the subject invention is worn by a user and in contact with their flesh, and that when the vibration membrane takes up the voice freq

Abstract: A new prenatal music belt for sharing the soothing effects of music and the like with an unborn child. The inventive device includes an elongated, elastic belt with a buckle at one end of the belt for readily permitting adjustments to the size of the belt. A pair of pockets are attached by loops to the belt so that the position of the pockets can be adjusted to any position along the belt. The pockets are sized and shaped for retaining earphones from a sound playback device therein, with the earphone being directed towards the mother's abdomen so that sound from the earphones is directed towards the fetus. The sound playback device is attached by a clip to the belt at any position therealong which is comfortable to the wearer. The pockets are closed by VELCRO/hook and loop type fasteners in order retain the earphones therein.

Abstract: A transmitting/receiving apparatus for use in telecommunications is provided which makes the user hand-free and is free from such inconveniences as difficulty in utterance and howling and crosstalk between an earphone and a microphone, and which includes: a first ear-insertion body serving as an earphone; and a second ear-insertion body provided separately from the first ear-insertion body and serving as a microphone of a bone-conduction type.

Abstract: An audible environment awareness restoring device allows a person to perceive, through his sense of touch, audible sounds corresponding to the human voice. A bone conduction speaker or transducer is mounted against a person's body, preferably against the sternum. An audio signal from one or more microphones is fed to the bone conduction speaker or transducer which converts the audio signal to vibrations. The bone conduction speaker or transducer transmits the vibrations to the person's rib-cage which will then resonate in synchronism with the input audio signal.

Abstract: A skin touch-controlled piezoelectric microphone which includes a housing having a thin bottom side that admits vibrating waves from the user's skin when the user talks, a metal base plate mounted in the housing and having a negative signal electrode contact, a signal metal plate mounted in the housing and having a positive signal electrode contact, two ceramic plates sandwiched in between the metal base plate and the signal metal plate, a PC board mounted on the metal base plate and having a negative signal electrode contact and positive signal electrode contact respectively connected to the negative signal electrode contact of the metal base plate and the positive signal electrode contact of the signal metal plate for converting the collected voice signal into an electric signal, and a signal line connected to the PC board for output of the electric signal.

Abstract: An apparatus and method for simulating a human mastoid is disclosed. The apparatus includes a diaphragm having a mass, springiness and damping means sufficient to more closely replicate the impedance of a human head bone and skin overlying the same, than prior art testing devices. In a preferred embodiment, the method includes placing the diaphragm over the central opening of an artificial ear and placing a bone conduction hearing aid on top of the diaphragm. A microphone disposed below the opening measures the sound generated by the vibration. These measurements provides an indication of whether the bone conduction hearing aid is functioning properly. The apparatus and method are not only easier to use and less expensive than prior art devices and methods, they are also as accurate, if not more accurate.

Abstract: A transmitting/receiving apparatus to be used as fitted into an external auditory meatus is provided which ensures less inclusion of noise and less possibility of howling and allows the user to hear the voice of the communication partner clearly, and which comprises: a bone-conduction microphone (2) and a speaker (3) which are housed in a single casing (4), the casing (4) having a distal end portion to assume a distal position in the external auditory meatus, in which distal end portion the bone-conduction microphone (2) is disposed; a vibration-absorptive foamed material (6) surrounding the bone-conduction microphone (2); a hollow portion (2) provided between the foamed material (7) and the speaker (3) within the casing (4); and a through-hole (8) extending through a wall portion of the casing (4) at a location adjacent the distal end portion.

Abstract: An audio listening device includes a circuit for amplifying sound source signals and a mechanism including a bone conduction vibrator transforming an output signal of the amplifying circuit into a vibration. A vibration source transforms the output of the amplifying circuit into a first magnetic field and vibration. A vibration generating unit generates a second magnetic field for the vibration source to vibrate upwards and downwards due to attraction and repulsion processes of the first and second magnetic fields. A damper is connected to the vibration source to arouse air conduction hearing due to the vibration of the vibration source. A vibration plate is connected to the vibration source to arouse a bone conduction hearing due to the vibration of the vibration source. A vibration transmission unit transmits the bone conduction hearing and air conduction hearing to the hearing impaired.

Abstract: The present invention relates to an apparatus and method for providing sound distinctions for auditory conditioning. An audio storage media is used for storing multiple channel audio recordings. The audio storage media is played on a multiple channel audio player. A channel selection device is coupled to the multiple channel audio player for adjusting the strength of each channel of the multiple channel audio player. Headphones are coupled to the channel selection means for allowing the user of the apparatus to listen to at least one channel of the multiple channel audio recordings stored on the audio storage media. By separating the sounds into different channels, a user of the apparatus and method will be able to better distinguish sounds thus increasing the learning ability of the user.

Abstract: An in-ear type earphone according to the present invention includes an in-ear type speaker element and a cable disposed externally of the earphone. The cable is coupled at one end to the speaker element such that the cable hangs freely from the speaker element. The opposite end of the cable is coupled to a plug. The plug operatively connects the earphone to a sound signal source. A sliding round shaft is rotatably mounted at one end of the speaker element. A sliding sleeve receives an opposite end of the sliding round shaft and allows it to move along a longitudinal axis. The earphone also has an ear hanger with a helix stopper end, a curved hook section, and a lobule stopper end integrally formed and contoured to the general shape of a human ear. The helix stopper end is mounted to the sliding sleeve in a fixed manner.

Abstract: Sound sensations are produced in the ear of a user by contacting the surface of the ear canal with an electrode and applying, between the electrode and another area of the user's body, electrical signals representing sounds to be heard. Preferably the electrode is mounted on an ear mold and a lead connected to the electrode, the lead extending through the mold to a source of audio electrical signals. The source may be a microphone on the ear mold.

Abstract: The herein described invention relates to an ear mounted, in-the-ear compound microphone system which simultaneously uses both an accelerometer, or vibration transducer, to sense bone conducted low speech frequencies and a microphone with controlled frequency response to sense airborne high speech frequencies within the ear canal. It combines the speech spectrum components picked up by the two transducers into a single composite audio signal with improved human speech frequency response characteristics. It simultaneously demonstrates significantly reduced sensitivity to surrounding background noise and provides measurable hearing protection for the user. Through adjustment and alteration of the supporting electronic circuitry, the operating characteristics and performance of the compound microphone can be changed. The in-the-ear microphone system can be used with a two-way speech system by installing a miniature earphone element within a common housing with the microphone.

Abstract: A bone conduction speaker and mounting system allows a person to perceive audible sounds, such as music, through his sense of touch. A bone conduction speaker or transducer is mounted against a person's body, preferably against the sternum. An audio signal is fed to the bone conduction speaker or transducer which converts the audio signal to vibrations. The bone conduction speaker or transducer transmits the vibrations to the person's rib-cage which will then resonate in synchronism with the input audio signal. The audio signal may also be simultaneously fed to regular audio speakers to allow a person to hear as well as feel the audible sounds or music.

Abstract: A bone conducting hearing aid comprises a housing adapted to be pressed against a head of a user and a magnetic system held in the hearing aid housing, The magnetic system includes a permanent magnet, a coil, an armature of a soft magnetic material and a spring holding the armature. A conductor button is arranged to move with the armature, the conductor button being shaped to be brought into contact with the mastoid bone of the user's head, and a rubber bearing having a predetermined elastic constant holds a support spring for the conductor button on the hearing aid housing. To increase the difference between the useful signal and the spurious signal received by the hearing aid, the support spring has an elastic constant not exceeding 0.4 N/cm.

Abstract: An ear microphone includes a holder (2) adapted to be disposed and retained entirely in a wearer's outer ear region, that is, outside the wearer's auditory meatus (ear canal), and, a microphone unit (4) mounted in the rim of the holder for reception of speech sounds transmitted through the wearer's tissue from the jawbone. The microphone unit is mounted in a portion of the edge of the holder (2) facing the bottom of the wearer's tragus when the holder is worn in the ear, disposed in the wearer's outer ear region. The microphone unit is insensitive to airborne sounds by having a rubber cover. Sound blocking is included between the microphone unit and a sound generator placed in the holder adjacent to the ear canal.

Abstract: An electronic driver for use with linear and non-linear transducers includes a voltage controlled oscillator (1630) to generate an output signal (1603) in response to a frequency control signal (1625); a transducer driver (1604), coupled to the voltage controlled oscillator (1630) and to the transducer (600), includes an electromagnetic driver (604) to generate an electromagnetic field in response to the output signal (1603), and a power control circuit (2104, 2106) to suspend generation of the electromagnetic field for a portion of the output signal, the electromagnetic field generating movement of a magnetic motional mass (636) which is transformed into tactile energy; and a tactile energy monitor (1606) coupled to the electromagnetic driver (604) for monitoring a level of tactile energy generated by the movement of the magnetic motional mass (636), and in response thereto generates the frequency control signal (1625) to maximize the level of tactile energy generated.

Abstract: A body-acoustic device is provided which comprises a housing (1), a diaphragm (4) dividing an inner space of the housing into a first chamber (5) and a second chamber (6), and a loudspeaker (7) mounted to an opening provided in the diaphragm, wherein the diaphragm is made of a transversely vibratory member and/or has a perimetric edge supported by an inner surface of the housing via an elastic member (10), and wherein the diaphragm (4) is further provided with a port (9) for air movement between the first and second chambers (5), (6). When the loudspeaker (7) is operated, the diaphragm vibrates with a cone paper (8) to generate sufficient heavy bass sound with high sound clarity as if the diameter of the loudspeaker had increased. The port provided in the vibrating diaphragm facilitates the vibration of the diaphragm, further increasesing the sound pressure created by the diaphragm vibration due a sound throttling effect caused by the port.

Abstract: An improved system and related method are disclosed for producing vibratory sensations on a listener's body which are similar to those experienced during a live performance, both in their vibratory nature and in their properly synchronized timing with the audible sounds which the listener is hearing at any given moment. The vibrations are imparted to the body of the listener by using a gel pack interposed between the body of the listener and a rigid or semi-rigid member on which a surface transducer is mounted, thereby providing an enhanced degree of coupling between the surface transducer and a relatively large area of the listener's body. The propagation of vibrations to the body of the listener is delayed using electronic circuitry interposed between a source of electronic signals and the surface transducer to allow the sound waves from a speaker to reach the ears of the listener at the same time that the vibrations are provided to the body of the listener.

Abstract: An active noise control stethoscope enables a physician or paramedic to check vital signs in the presence of high background noise levels. A digital processing technique is used to remove noise from the output of a main detection sensor, the detector being impedance mismatched with air and therefore less sensitive to external airborne noise. Instead of a microphone, the detector uses a piezoceramic transflexural actuator mounted in a cylindrical piece of brass, with a polyurethane coating placed over the active side of the sensor to keep the sensor waterproof and broaden the response of the sensor. An identical sensor is placed above the device to detect background noise adjacent the device, the signals being combined to obtain a signal free of background noise. A third sensor is also used to electronically remove noise detected by the main sensor, the third sensor being positioned to pick-up noise coupled through the patient's body.

Abstract: A dual mode transducer (600) includes an electromagnetic driver (604), an armature including upper and lower substantially parallel planar suspension members (610) coupled to the driver (604), and a magnetic motional mass (616) suspended between the suspension members (610). The suspension members (610) include a plurality of independent planar non-linear spring members (612) arranged regularly about the central region (614) within a perimeter region (608). The spring members (612) are defined by members having maximum opposing widths tapering to minimum opposing widths at midpoints thereon, the maximum opposing widths are coupled to the central region (614) and to the perimeter region (608). The motional mass (616) couples to the electromagnetic field which alternately moves the motional mass (616), the movement being transformed through the spring members (612) and the driver (604) into motional energy. A soundboard (1014), coupled to the driver (604), couples the motional energy to a user.

Abstract: The present invention relates to an electronic device for the generation of acoustic spatial effects, which comprises two branch points being connected to an inlet for the left or right signal channels, respectively, of an external source; two earphone outlets for earphones for the left and right ears, respectively; two outlets for two vibrators; between each branch point and the corresponding earphone being inserted a passive circuit; each branch point being connected to the corresponding vibrator via a passive circuit or via a short circuit line. Said passive circuit may comprise a filter system which may be connected via a digital signal processor to an inlet of a terminal amplifier. Said filter system may constitute a sound control system.

Abstract: An air-borne converting device and a solid-borne converting device is provided in a case. The air-borne converting device has a loudspeaker for converting an electric signal into an air-borne sound, and a microphone for converting air-borne sound into an electric signal. The solid-borne device has a loudspeaker for converting an electric signal into solid-borne sound and a microphone for converting solid-borne sound into an electric signal.

Abstract: Waterborne acoustic signals are received and processed into electrical driver signals to energize a transducer held in selectively controllable vibration-transmitting engagement with a tooth of an underwater diver. The transducer converts the electrical signals into low amplitude sound-associated vibrations imparted to the tooth, through the jawbone and scull to the cochlea for processing into electrical signals carried to the brain and perceived as intelligible sound. The addition of conventional broadcast means permits two-way underwater communication. The transducer can be labially or occlusively mounted, preferably against an upper or maxillary tooth and the force of engagement between the transducer and the tooth is at least partially controlled by the diver to optimize communication characteristics.

Abstract: A transducer assembly includes a bi-directional transducer coupled to an ear mold for transmitting and receiving sounds from a remote location. A by-pass channel is provided in the ear mold for ambient sounds which by-pass the transducer.

Abstract: An arrangement was devised for the delivery of stereophonic soundwaves through the mastoid bone structure of the human skull. The system allows for the partial bypassing of the use of the auditory canals, and for the conduction of audio output signals generated in a stereo radio, tape player or other audio device, leaving the auditory canals unobstructed and able to receive airborne sound waves. The system includes one or more accoustical transducers applied to the sides of a person's head adjacent each of his ear canals and in accoustical conduction with the mastoid bone structure thereat.

Abstract: A device for picking up bone-conducted sound in the external auditory meatus includes a fitting portion for accommodation in a navicular cavity formed between a tragus cartilage portion and an entrance portion of an external auditory meatus, and a bone conduction microphone unit for insertion into the external auditory meatus in such a manner as to be brought into contact with a wall of the external auditory meatus. The bone conduction microphone unit is held by the fitting portion via a resilient member in such a manner that at least a portion of the bone conduction microphone unit contacting the external auditory meatus is resiliently brought into contact with the wall of the external auditory meatus substantially orthogonally.

Abstract: A bone conduction microphone which fits into the ear of the user and which has means which abuts against the pinna of the ear causing a counteracting force to resiliently push the device against a wall of the ear canal nearest the back of the head, where bone conducted vibrations are detected most efficiently.

Abstract: A system for two way communication under shallow water or between a swimmer and observer comprising a transceiver, a wire for conducting electrical signals connected to the transceiver, a watertight transducer housing that curvedly conforms to human heads incorporating a speaker/microphone transducer in watertight connection with the wire, an adjustable strap connected to the transducer housing so that it may be attached to a portion of a human body, and a hollow acoustic transmission tube in watertight connection with the transducer housing for sound transmission to an earplug which is inserted into a human ear.

Abstract: A voice transducer used for telecommunication by a telephone installed in a motor vehicle or the like, including: a main body having a side surface to be contacted with an operator's head so as to detect vibrations of produced voice waves when they are transmitted through the skull of the head, and convert them into electric signals; a holder member of the main body; and a connecting member which connects the main body to the holder member in such a manner that the position of the side surface of the main body with respect to the operator's head can be adjusted. The main body includes a piezoelectric transducer to detect the vibrations, a damper material which surrounds the piezoelectric transducer, and a casing which surrounds the damper material and includes the side surface to be contacted with the operator's head, and the side surface of the casing is pre-treated to have a small coefficient of friction.

Abstract: An earpiece has a structural configuration effective to removably interlock its outer surface contiguously to the outer ear auricle of the earpiece wearer. A microphone substantially exclusively receives, from the air of the external auditory canal, outbound voice sounds caused by the reverse modulation of the tympanic membrane when the earpiece wearer speaks. An outbound audio circuit is electrically connected to the microphone which converts the outbound voice sounds to electrical voice signals. The outbound audio circuit amplifies the outbound electrical voice signals to a preselected fixed level output gain and removes noise from the voice signals.

Abstract: A voice-controlled musical device is driven by an electroglottograph as an input to a controller. The electroglottograph (EGG) has a transducer in the form of a band that is located about the user's neck. The EGG converts the cycle of opening and closing of the vocal folds of the user's vocal chords into a clean electrical signal that is particularly accurate with respect to pitch. An output from a microphone integral to the band picks up acoustic dilations of the throat wall concurrent with the glottal cycle and this output is also applied to the controller to indicated vocal source volume. The EGG and microphone signals are combined and converted into a MIDI digital code which can be used to drive a musical synthesizer or a computer. An external switch may be used to alter the attack of a continuous voice performance.

Abstract: A hands-free telephone assembly according to the present invention comprises a speech network mounted in a base and having an input channel and an output channel, the speech network being connected to a telephone interface which is selectively connectable to a telephone line. Also included are a gain-controllable amplifier in said input channel, a primary transducer including a primary speaker connected to the output of said gain-controllable amplifier, and a primary microphone, and a gain and frequency controllable amplifier connecting the primary microphone to said input channel. The primary transducer is mounted in a housing separate from the base, said housing being constructed and arranged so as to fit within the ear canal of a user and to be releasably maintained therein. Finally, the assembly contains a cancellation mechanism for suppressing positive feedback between the primary microphone and the primary speaker.

Abstract: A mounting for a microphone includes a plate with an opening the plate being shaped and arranged so that it holds a microphone secured in said opening with the microphone contacting a person's neck. In this position the microphone can pick up sounds produced by the person through bone conduction.

Abstract: The present invention provides a headrest (1C, 2C) in which a bone-conduction microphone (1B, 2B) is mounted in such a position as to be in contact with the back side of the head of the operator. The invention also provides a mobile body comprising the headrest (1C, 2C) as a constituent member and characterized in that the output of the bone-conduction microphone is used for a telephone voice or for speech recognition control of a device such as one installed on a vehicle. The invention further provides a mobile body comprising the headrest as a constituent member and characterized in that sleep of the operator is detected by the output of the bone-conduction microphone (1B, 2B).

Abstract: There is disclosed a body speaker comprising a casing having an upper part and a lower part, the upper part having a central circular aperture closed by a cap, a thin magnetic disk with a small diameter centrally attached on the inside of the cap, a tubular member fixed around the central circular aperture of the upper part, a solenoid coil wound around the tubular member, and an oscillation body for oscillating in response to variation of the magnetic field of the solenoid coil, wherein gaps are formed between the upper and lower surfaces of the oscillation body and the inside surfaces of the upper and lower part of the casing when the oscillation body is fixed on the inside wall of the casing by means of the oscillation ring, so that the oscillation body freely oscillates upward and downward in response to variation of the magnetic field of the solenoid coil conducting current.

Abstract: In a talk/listen headset, essentially comprising two ear protection capsules (1, 2) connected to one another via a headband (3), two microphones (6, 7) are located in one of these along a vertical (9) which runs, projected on the head of the wearer, through the middle of the temporal bone and extends up to the mandibular angle. While the upper microphone (6) acts in the area of the end of the zygomatic arch, the lower microphone (7) is located in the area of the articular process of the ascending ramus of the jaw. Both microphones (6, 7) react to solid-borne sound and are piezoelectric resonators with a mass-forming body, an impedance converter and a filter/equalizer, the microphones being connected to one another in terms of voltage in order to absorb or compensate the local tone amplitudes to the bottom and to the top caused by the reproduction. This has the effect that this indirect reproduction of the voice is optimised in terms of tone and timbre.

Abstract: A user can alternately send information to one of two parties on different telephone lines by mounting a microphone/speaker transducer in each ear, and connecting each transducer to a speech network device that is operatively connected to the respective telephone lines such that each transducer is connected to a different one of the telephone lines. The user may speak exclusively to only one of the parties by selectively muting the transmission of microphone signals through the speech network device connected to the telephone line connected to other party. Because the transducers are of the hands-free type, the user can easily manipulate the muting switch of one or the other of the speech network devices in accordance with which of the two parties to whom he wishes to speak in private.

Abstract: A microphone assembly for mounting in a head gear of a person includes a microphone positioned in intimate contact with the person for receiving vibrations from the vocal cords by bone conduction, a housing for holding the microphone, a mounting ring for mounting the housing to the head gear and a damper element disposed between the microphone and the head gear for damping extraneous sides transmitted through the headgear before they are picked up by the microphone.

Abstract: The conversation device of an MR imaging apparatus including a magnet for generating a static magnetic field, a gradient field coil disposed between pole pieces of the magnet and used for endowing an NMR signal with positional information, a high-frequency coil disposed in the gradient field coil for transmitting an electromagnetic wave and for detecting the NMR signal, and a bed disposed in the high-frequency coil for holding a person to be inspected, is disclosed. In this conversation device, a bone conduction microphone insensitive to a magnetic field and surrounding noise is mounted on an auxiliary member (which is used for placing the to-be-inspected person at a predetermined position on the bed) so that the bone conduction microphone can be kept in contact with that part of the to-be-inspected person which can conduct the voice of the to-be-inspected person by a bone.

Abstract: An inertial transducer is provided comprising a housing containing therein a magnetic circuit including components thereof separated by a spring diaphragm wherein the flexing of the diaphragm causes the components to move toward and away from each other to induce a current in a coil. The spring diaphragm served to separate the housing into two tuned cavities, the frequencies of which differ from each other and from that of the spring diaphragm. The transducer has frequency response peaks at the resonant frequencies of the cavities and spring diaphragm.

Abstract: An underwater speaker system having a pressure equalization system enabling the speaker to operate in its intended fashion over a wide range of water depths, e.g. from two feet up to sixty feet. Water pressure is applied to a diaphragm that forms one wall of a variable volume an internal face of a speaker membrane. Pressures are equalized on opposite faces of the membrane to enhance speaker performance.

Abstract: A bone conduction personal audio listening device and method is worn behind one or both ears in substantially close contact with the mastoid bone of the listener. The device is maintained on the listener's ear by hooking over the top of the ear, by hooking under the bottom of the ear, and by the contact with the mastoid bone. Due to placement of the device behind the listener's ear(s) ambient sounds of the local environment can be heard. Provision is also made for the listener through ear plug means to block out ambient sounds if so desired. The listener can remove and replace the waterproof audio speaker assembly of the device for cleaning purposes, or to change the color or reflectivity of the device for safety and/or cosmetic reasons.

Abstract: A speaker system having a magnet and voice coil are mounted within a dome-shaped enclosure in such a way as to be capable of transmitting sonic vibrations and audio waves through a liquid medium or solid structure, the dome-shaped enclosure cooperating with the magnet and voice coil in such a way as to greatly enhance the waves and sonic vibrations generated to the other medium or structure.

Abstract: Audio-band electromechanical vibration converter characterized in that a yoke having a permanent magnet and a magnetic gap formed therein is displaceably housed by a damper in a casing to which a vibration plate is attached; a coil attached to the casing is placed in said magnetic gap; and the casing gives an output of a mechanical vibration synchronized with a low-band audio-signal.

Abstract: An ear microphone includes a bimorph piezoelectric transducer mounted on a PC board having an amplifier therein and surrounded by a helically wound spring. The piezoelectric transducer and spring are potted in a semi-soft potting compound which is formed in a shape adapted to be inserted into an external auditory ear canal to permit bone conduction to the microphone element. A cable is coupled to the amplifier through which a signal can be withdrawn for processing by electronic equipment.

Abstract: A radio transmitter and receiver device in which a head band has a transmitting microphone at one end and a receiving speaker at the other end. This microphone comprises a bone transmission type microphone for detecting aural oscillation of an external auditory canal transmitted through a bone tissue of a head portion from a mouth, said microphone being brought into contact with a side head portion at the rear of an ear. Thus, one ear is blocked by the speaker but the other ear is open, and therefore, a user can catch noises thereabout. A transmitting and receiving antenna has matching means and is mounted on the side of the speaker.

Abstract: This invention, directed to a displacement type bone vibration ear microphone possessing an electroacoustic transducer element planted in one of the end faces of a support member and a damper member formed so as to enclose therewith the electroacoustic transducer element, is characterized by disposing a flexible reinforcing member around or near the electroacoustic transducer element, allowing a free end of the electroacoustic transducer element and a outer end of the reinforcing member to be joined or juxtaposed to each other, and enclosing the periphery of the electroacoustic transducer element and the reinforcing member with the damper member thereby providing protection for the electroacoustic transducer element and heightening the efficiency of electroacoustic conversion.