Abstract: An audio source tracking arrangement, integrated in or connected to a video conference system, for determining a position of a source creating a sound, including: at least an audio signal processing module configured to determine the position of the source creating the sound based on a plurality of audio signals originating from the source respectively captured by a plurality of microphones; and one or more microphone housings, respectively encapsulating at least one of the plurality of microphones, the one or more microphone housings including a cavity in which at least one of the plurality of microphones is localized, an aperture on a surface of the microphone housing, and a channel extending from the cavity to the aperture, wherein the channel and the cavity are dimensioned to form an acoustical amplifier with a frequency response having one or more high frequency peaks in a frequency band of the sound.

Abstract: A microphone mounting assembly (800A/800b) include one or more transducers (801) mounted to a printed circuit board (PCB) (805) where a spacer (803) is used having a channel (807) positioned on the PCB (805) for allowing acoustical energy to pass through the channel (807) to a port (809) in the PCB (805). A first cover (811) is positioned over the channel (807) for disrupting the direct encounter with airflow into the channel (807) while a top section (813) having a second cover (815) is further positioned adjacent to the first fabric cover (811) for preventing debris from obstructing the first fabric cover (811).

Abstract: The disclosure relates to a microphone coupler and coupler system for a communication device. The system comprises: a printed circuit board; a microphone having a port facing towards the printed circuit board and aligned with an opening through the printed circuit board; and a microphone coupler for the microphone. The coupler comprises: a conduit having an internal channel therein, a distal end, a proximal end, a first opening in the distal end connecting to the internal channel and a second opening in the proximal end connecting to the internal channel. In the system, the proximal end of the coupler is locatable about the opening of the printed circuit board to have the second opening mated to the opening of the printed circuit board; and the distal end of the coupler extends towards an end of the printed circuit board.

Abstract: A vehicle audio device includes a vibrator (30), a first threaded member (20), a second threaded member (32), and a ring-shaped resilient member (25). The first threaded member (20) includes a tubular portion (22), an external thread (22m) formed on an outer surface of the tubular portion (22), and a flange (24) formed on one end of the tubular portion (22). The resilient member (25) is fitted around the tubular portion (22) of the first threaded member (20) so as to axially oppose the flange (24) of the first threaded member (20). The second threaded member (32) includes a ring-shaped portion (32f) axially opposing the resilient member (25) from the side of the resilient member (25) not opposing the flange (24) of the first threaded member (20). Internal threads (32w) are formed on an inner surface of the ring-shaped portion (32f) and are engageable with the external threads (22m) of the first threaded member (20). The vibrator (30) is mounted to one of the first and second threaded members (20, 32).

Abstract: The present invention discloses a microphone comprising a first electrode, a second electrode, a printed circuit board and a shielding layer. The microphone is configured into a mobile communication device. The shielding layer located on the printed circuit board is disposed on the microphone. When the mobile communication device charges with an AC power supply and communicates with others simultaneously, the shielding layer can diminish the 50˜60 Hz noise produced by the AC power supply. Owing to the shielding layer reduces the EMI effect; the talking quality of the mobile communication device is thereby enormously improved.

Abstract: A wireless earphone with an indicating light includes a cover, a hanger connected to the cover, a housing, a microphone, an indicating light and a PCB. An outer hole is opened in the cover. The housing is accepted in the cover. An inner hole is opened in the housing and corresponding to the outer hole. The microphone and the indicating light are arranged in the housing and connect to the PCB, the indicating light protrudes into the inner hole. An escutcheon is arranged between the outer hole and the inner hole to resist dust into the inner hole. The light from the indicating light is delivered via the inner hole and the outer hole to the outside.

Abstract: A windguard for a microphone includes an acoustic inlet at a downstream end and at least one pressure-relief port upstream of the acoustic inlet. The windguard has a base, a skirt depending from the base, and a first hood projecting from the base. The base and skirt provide space to accommodate the microphone. The first hood extends from an upstream end of the base to the downstream end and includes the acoustic inlet at the downstream end. The pressure-relief port(s) is located on the first hood at the upstream end and is protected by a second hood.

Abstract: A voice acquisition system for a vehicle includes an interior rearview mirror assembly. The mirror assembly may include a microphone for receiving audio signals within a cabin of the vehicle and generating an output indicative of these audio signals. The microphone may provide sound capture for a hands free cell phone system, an audio recording system and/or an emergency communication system. The system may include a control that is responsive to the output from the microphone and that distinguishes vocal signals from non-vocal signals present in the output. The microphone may provide sound capture for at least one accessory of the equipped vehicle, and the accessory may be responsive to a vocal signal captured by the microphone. The interior rearview mirror assembly may include at least one accessory, such as an antenna, a video device, a security system status indicator, a tire pressure indicator display and/or a loudspeaker.

Abstract: A timepiece includes a casing having a casing interior having a viewer's side provided with a viewing opening, a base side provided with a sound aperture, and an annular surface surrounding the sound aperture. A membrane extending over the sound aperture closes the base side of the casing interior, the membrane having a circumferential region in sealed connection with the annular surface. A tensioning device maintains the membrane at a desired tension in the radial direction. A vibration generator arranged in the casing interior produces a sound whose frequency can be adjusted by adjusting the tension of the membrane.

Abstract: A microphone boot for a portable electronic device and a portable electronic device having such a microphone boot are provided. In accordance with one embodiment, there is provided a portable electronic device, comprising: a printed circuit board (PCB); a microphone attached to the PCB and defining an aperture therein; a frame enclosing the microphone and PCB and defining an opening therein; a cap attached to the frame and defining an aperture therein; and a microphone boot received in the opening in the frame and defining an acoustic channel between the aperture in the microphone and the aperture in the cap.

Abstract: A wireless microphone for vehicles includes a housing, an audio plug extending from one end of the housing, a wireless transmitter within the housing, a transducer within the housing, the transducer being electrically connected to the transmitter, and a wireless receiver within the housing, the receiver being electrically connected to the plug, wherein the plug is configured to plug into an auxiliary input on a vehicle audio unit and thereby mechanically support the microphone.

Abstract: In various embodiments, a speakerphone may comprise multiple (e.g., 16) microphones placed in a circular array around a central speaker. Each microphone may be mounted to the speakerphone through a microphone support. The microphone support may be made of a flexible material and have various features designed to minimize interference to the microphone (e.g., from the speaker and/or vibrations external to the speakerphone). The centrally mounted speaker may be coupled to a stiff internal speaker enclosure. The speaker enclosure may be made of a stiff, heavy material (e.g., a dense plastic) to prevent the speaker vibrations from excessively vibrating the speakerphone enclosure (which may affect the microphones).

Abstract: A portable terminal device can extrapolate the position of a sound source in the thicknesswise direction regardless of the use style. A slide type portable terminal has an upper casing, a lower casing, and a coupling part that couples the casings in such a way that their positional relation is changeable. The upper casing has a plurality of first microphones, and the lower casing has a second microphone. In a handhold style, one of the first microphones and the second microphone are lined in the thicknesswise direction of the cellular phone. As the upper casing is slid, the other one of the first microphones and the second microphone are lined in the thicknesswise direction of the cellular phone. The position of a sound source in the thicknesswise direction can be extrapolated from output signals of a formed microphone array in the thicknesswise direction.

Abstract: A wind break device for a microphone includes an airflow diverter and a flow separation edge partially bordering a microphone end of the airflow diverter. The microphone zone located between the flow separation edge and is part of the recirculation zone. The microphone is located in the microphone zone. Airflow separates from one of the airflow diverter or the flow separation edge. The separated airflow is directed as one of recirculating airflow or a major airflow and the recirculating airflow is directed into the recirculation zone. The major airflow is directed over the microphone zone and the recirculation zone to reduce the level of pressure fluctuations experienced by the microphone in the microphone zone.

Abstract: An apparatus for improving an image in a car audio system, and a control method thereof are provided. The apparatus includes: a first speaker unit for outputting a high band sound from a sound reproduced in the car audio system; a second speaker unit for outputting a middle band sound and a low band sound from the sound reproduced in the car audio system; a first structure for providing a directionality for the low band sound; and a second structure for rotating the first structure correspondingly to a position of a user of the car audio system.

Abstract: A connector for receiving a cylindrical plug includes a body defining a plug aperture and a cavity for receiving the cylindrical plug. A plurality of electrical contacts in communication with the cavity make electrical connections with the cylindrical plug and retain the cylindrical plug. A microphone is coupled to the body such that the plug aperture and the cavity provide an acoustic path to the microphone. The microphone may be at an end of the connector opposite the plug aperture or on a side of the connector adjacent the plug aperture. The connector allows a microphone to be added to a device, such as a mobile telephone, without the need for an additional external aperture. The microphone in the connector may operate with a second microphone and processing electronics in the device to provide audio processing functions such as noise cancellation or audio beamforming.

Abstract: A microphone shell includes a top wall and a side wall extending downwardly from peripheral area of the top wall. A receiving room is formed between the top wall and the side wall for containing a microphone soldered with a printed circuit board, and a through hole arranged on center of the top wall. Voice is transmitted only through the through hole and gathered in the receiving room of the microphone shell, and then received by the microphone. In addition the microphone receives no external noise because the microphone shell covers the microphone and obstructs the external noise. Therefore, the microphone shell not only gathers voice but also obstructs noise.

Abstract: A wind protection device for a microphone, the wind protection device including a body portion having a raised surface, a lower surface and a front face. The raised surface has a flow separation edge. The lower surface is offset from the raised surface the front face is bordered at a first edge by the flow separation edge and bordered at a second edge by the lower surface. The lower surface includes a recessed microphone holding area. Airflow separates from one of the raised surface or the flow separation edge, and the separated airflow is directed as one of recirculating airflow or a major airflow. The recirculating airflow is directed into a recirculation zone, and the major airflow is directed over a microphone zone and the recirculation zone to reduce the level of pressure fluctuations experienced by the microphone located in the recessed microphone holding area.

Abstract: A vehicle interior rearview mirror assembly comprises an accessory, a reflective element and a bezel. The mirror assembly may define portions of a pocket that at least partially receives and secures the accessory therebetween when the reflective element is at least partially received in the bezel. The mirror assembly may include a microphone and an acoustic cover positioned at least partially over one or more inlet ports of the microphone. The acoustic cover may include an outer air flow limiting layer that substantially limits air flow therethrough and a diffusing material that may space and support the outer layer from the inlet ports to substantially diffuse air flow that penetrates the outer layer. An acoustic barrier may be positioned between a pair of inlet ports of the microphone to enhance the directivity of the microphone.

Abstract: An electronic device includes a casing defining a sound receiving chamber therein, and a microphone accommodated in the sound receiving chamber. The sound receiving chamber has an arcuate surface being part of an outer elliptical surface. The microphone is located at a focus of the elliptical surface, with a sound receiving surface of the microphone facing the sound receiving chamber. The other focus of the elliptical surface is disposed at a position out of the sound receiving chamber.

Abstract: A motor vehicle safety device allows the driver to hear nearby vehicles, so the driver can tell by ear when vehicles are in his blind spots, without significantly increasing the sound level inside the vehicle when there are no vehicles close to the host vehicle's blind spot. One benefit of this invention is the blind spot alert, or blind spot warning. Another benefit is that, because this invention communicates aural information from the host vehicle's environment to the driver, the driving experience is sensually richer and more interesting. The driver remains more alert and focused on the driving task. Elements of this invention, all of which are inexpensive, include directionally selective microphones (20) mounted on the vehicle, electronic signal processing (22), and loudspeakers (24) that are mounted close to the ears of the driver.

Abstract: An electronic device includes a circuit board, a first microphone module, and a second microphone module. The first microphone module includes a first omnidirectional microphone connected to the circuit board, a first boot also connected to the circuit board, and a first tube extending from the first boot. The second microphone module includes a second omnidirectional microphone connected to the circuit board, a second boot also connected to the circuit board, and a second tube extending from the second boot. The first and second omnidirectional microphones are identical, and the first and second boots are identical.

Abstract: A vehicle interior rearview mirror assembly (10) comprises an accessory (24), a reflective element (18) and a bezel (20). The mirror assembly may define portions of a pocket (23) that at least partially receives and secures the accessory therebetween when the reflective element is at least partially received in the bezel. The mirror assembly (11) may include a microphone (124) and an acoustic cover (126) positioned at least partially over one or more inlet ports (124j, 124k) of the microphone. The acoustic cover may include an outer air flow limiting layer (130b) that substantially limit air flow therethrough and a diffusing material (130a) that may space and support the outer layer from the inlet ports to substantially diffuse air flow that penetrates the outer layer. An acoustic barrier (132) may be positioned between a pair of inlet port of the microphone to enhance the directivity of the microphone.

Abstract: An electronic device is provided, which includes a first cover, a second cover, a circuit board, and a first microphone. The first cover comprises a first wall portion, a first storage space encircled by the first wall portion, and a first acoustic opening connected to the first storage space. The circuit board is affixed to the second cover. The first microphone is mounted on the circuit board and disposed in the first storage space to receive external sound through the first acoustic opening.

Abstract: The present invention relates to wind noise reduction for a microphone (10) achieved by locating a microphone pick up (2) in a chamber (4) provided with at least one sound passage (5), wherein one or more elements (s) (6) is/are provided in the sound passage (s) (5) to decrease the speed of the air stream.

Abstract: An electronic device includes a display, a plurality of chambers, and a microphone array. The display includes a front cover and a rear cover affixed to the front cover. The plurality of chambers is formed on the rear cover. The microphone array includes a plurality of microphones disposed in the chambers.

Abstract: A keyboard includes a main body disposed with a plurality of keys and an integrated member. The integrated member is detachably connected to the main body. The integrated member is capable of being moved with respect to the main body between a first position where the integrated member and the main body forms a substantially flat surface and a second position where the integrated member is capable of being activated to receive audio inputs.

Abstract: Presented is device that attaches a microphone to a circuit substrate and includes a main holder unit holding a microphone and a main socket unit holding the main holder unit. Mounted in the main holder unit are inner contact pieces coming into contact with output terminals of the microphone when it is being held outer contact pieces coming into contact with inner contact pieces of first or second intermediate terminal members, and first and second terminal members formed from base sections connected at their bottom ends in a V-shape. On the main socket unit is disposed inner contact pieces, bends, bent from the upper ends thereof, and first and second intermediate terminal members formed as an inverted V-shape member from outer contact pieces formed at the lower ends thereof.

Abstract: A portable electronic device may have acoustic ports such as microphone and speaker ports. Acoustic devices such as microphones and speakers may be associated with the acoustic ports. An acoustic port may have an opening between an interior and exterior of the portable electronic device. The opening may be covered by a metal mesh. An acoustic fabric may be interposed between the metal mesh and the opening. The opening may be formed from a hole in a glass member having outer and inner chamfers. A microphone boot may be provided that forms front and rear radial seals with a housing of the device and a microphone unit respectively. The microphone boot may also form multiple face seals with the microphone unit. A speaker for the speaker port may be enclosed in a sealed speaker enclosure. The speaker enclosure may have a pressure-equalizing vent slit covered with an acoustic mesh.

Abstract: In various embodiments, a speakerphone may comprise multiple (e.g., 16) microphones placed in a circular array around a central speaker. Each microphone may be mounted to the speakerphone through a microphone support. The microphone support may be made of a flexible material and have various features designed to minimize interference to the microphone (e.g., from the speaker and/or vibrations external to the speakerphone). The centrally mounted speaker may be coupled to a stiff internal speaker enclosure. The speaker enclosure may be made of a stiff, heavy material (e.g., a dense plastic) to prevent the speaker vibrations from excessively vibrating the speakerphone enclosure (which may affect the microphones).

Abstract: The disclosure relates to a microphone coupler and coupler system for a communication device. The system comprises: a printed circuit board; a microphone having a port facing towards the printed circuit board and aligned with an opening through the printed circuit board; and a microphone coupler for the microphone. The coupler comprises: a conduit having an internal channel therein, a distal end, a proximal end, a first opening in the distal end connecting to the internal channel and a second opening in the proximal end connecting to the internal channel. In the system, the proximal end of the coupler is locatable about the opening of the printed circuit board to have the second opening mated to the opening of the printed circuit board; and the distal end of the coupler extends towards an end of the printed circuit board.

Abstract: An electronic device includes a housing, a circuit board, a plurality of flexible holders, and a plurality of microphones. The housing includes a plurality of wall portions, a plurality of storage spaces encircled by the wall portions, and a plurality of acoustic openings connected to the storage spaces. The flexible holders are disposed in the storage spaces. Each of the flexible holders comprises a plurality of surfaces and at least one rib provided on the surfaces. The microphones are mounted on the circuit board and disposed in the flexible holders.

Abstract: A microphone assembly includes a flexible holder, a microphone, and a piece of non-woven fabric. The flexible holder has a top opening. The microphone is fitted into the flexible holder. The piece of non-woven fabric is attached to the microphone and totally disposed in the top opening of the flexible holder.

Abstract: The invention provides a microphone coupler for a microphone located within a housing of a portable communication device and a device incorporating the coupler. The coupler comprises a body section and a conduit or just a conduit. The body section is shaped to fit around the microphone and is defined by one or more walls and within the walls an interior cavity is defined. One wall has a port in through connecting to the cavity. The cavity can receive at least a portion of the microphone and provides a space between the microphone and the body section. The conduit has an internal channel, a distal end, a proximate end and openings at each end connecting to the channel. For the conduit, the proximate end is connected to the body section and the second opening mates with the port.

Abstract: Two microphone assemblies 3 each having a main sound hole 61M and an auxiliary sound hole 61S are placed at a distance from each other facing the same direction, the main sound hole 61M being offset to one side with respect to an axis of an electret condenser microphone 4 and communicated with a rear face 4B of the electret condenser microphone 4 and the auxiliary sound hole 61S being offset to the opposite side of the axis of the electret condenser microphone 4 from the main sound hole 61M. The auxiliary sound holes 61S are provided in one face 1F of a housing 10 and the main sound holes 61M are provided in other faces 1R and 1L continuous with the face 1F of the housing 10. Directional axes extending from the respective auxiliary sound holes 61S to the respective main sound holes 61M are separated from each other at an angle.

Abstract: The invention relates to a motor vehicle having a system for reproduction of sound, said system for reproduction of sound including as least one bass reflection box equipped with a bass reflection tube and/or a bass reflection opening and with at least one built-in speaker. For that purpose, the bass reflection box is arranged in a side compartment of the interior of the vehicle, and a wall of the bass reflection box, oriented towards the interior of the vehicle, is at least partially coverable with a sound-transmissive lid, the service tools and emergency aids being arranged between depressions in said wall and the lid. With the present invention, a motor vehicle having a sound reproduction apparatus is created in which a large-volume bass reflection box is optimally accommodated in the trunk compartment. Here the bass reflection box is additionally utilized to accommodate the service tool kit.

Abstract: An electronic device includes a front cover, a circuit board, a plurality of flexible holders, and a plurality of microphones. The front cover includes a plurality of wall portions, a plurality of storage spaces encircled by the wall portions, and a plurality of acoustic openings connecting to the storage spaces. The flexible holders have hollow bodies squeezed into the storage spaces. The microphones are electrically connected to the circuit board and squeezed into the hollow bodies of the flexible holders.

Abstract: A voice acquisition system for a vehicle includes an interior rearview mirror assembly attached at an inner portion of the vehicle. The mirror assembly preferably includes at least one microphone for receiving audio signals within a cabin of the vehicle and generating an output signal indicative of these audio signals, the at least one microphone providing sound capture for at least one of a hands free cell phone system, an audio recording system and an emergency communication system. The system includes a control that receives the output signal from the at least one microphone and distinguishes the presence of vocal signals from non-vocal signals. The system preferably comprises a learning mode whereby a vocal characteristic of a particular driver or occupant of the vehicle is learnt so that the ratio of vocal signals emanating from that particular driver or occupant to non-vocal noise signals received by the system is enhanced.

Abstract: Disclosed is a wireless receiving apparatus. The wireless receiving apparatus includes a connector including a plurality of terminals a predetermined terminal of which is assigned as an identification terminal for identifying an electronic appliance connected to the connector, and a circuit for generating an identification signal of a level corresponding to a voltage level of the predetermined terminal when the electronic appliance is connected to the connector, and for identifying the electronic appliance connected to the connector based on the level of the identification signal.

Abstract: A condenser microphone includes a microphone chip and an LSI chip, which are stored in a microphone package having a sound hole. External sound enters the sound hole so as to propagate through the internal space of the microphone package, so that it is received by the microphone chip. The microphone package is designed to set the Helmholtz resonance frequency within the audio frequency range. The output signal of the microphone chip is supplied to an impedance converter included in the LSI chip. The output signal of the impedance converter is attenuated by an attenuation device with respect to the prescribed frequency band including the Helmholtz resonance frequency, which decreases when the condenser microphone is installed in the housing of an electronic device. Thus, it is possible to achieve the flat frequency characteristics in the output signal of the condenser microphone, which is thus improved in the S/N ratio.

Abstract: A microphone module is mounted on a mount portion of a circuit board incorporated in a portable electronic device, wherein it includes a housing having a hollow cavity and a sound hole for communicating the hollow cavity with the exterior, a microphone chip for detecting sound in the hollow cavity, a plurality of external connection terminals electrically connected to the microphone chip, and a plurality of extended portions that are horizontally extended from the housing in a direction perpendicular to the opening direction of the sound hole. The external connection terminals are formed on the surfaces of the extended portions; and the housing partially projects from the surfaces of the extended portions.

Abstract: An airflow guard for a microphone includes a shell having an airflow diverter and a flow separation edge. The airflow diverter partially surrounds the microphone to redirect a flow of air away from the microphone. The flow of air separates from one of the airflow diverter or the flow separation edge. An acoustic reception system for a mobile vehicle and a hands-free communication device are also disclosed.

Abstract: An electronic device includes a body and a microphone module. The body includes a plurality of corners and a plurality of edges meeting at the corners. The microphone module is provided with a plurality of acoustic openings and disposed at the corners and/or the edges of the body to expose the acoustic openings.

Abstract: The invention provides a communication device comprising: a cover; a printed circuit board; a microphone on the printed circuit board; an antenna located at least in part within the cover; and a RF shield can shaped to fit over the microphone about the PCB. In the device, the cover is shaped to enclose the PCB and the RF shield can. The cover provides pressure on the RF shield can to press inward on the microphone to fixedly attach it to the PCB.

Abstract: A microphone assembly fitted to a panel of a vehicle-mounted control module, provided with a housing for housing a microphone and having an opening section on a surface facing the panel, and a holding case for holding the housing so as to be capable of pivoting, and when inserted into a receptacle provided in the panel the housing pivots so as to seal the opening section to the panel.

Abstract: A microphone enclosure for reducing the intensity of sound waves that reach a microphone is presented. The enclosure may be a solid mass with a cavity, designed so that most of the microphone is surrounded by the solid mass when the microphone is inserted into the cavity. The solid mass is dense enough to reduce much of the sound waves that are first mechanically and then acoustically coupled with the microphone. The microphone may be inserted into the cavity so that a sound receiving section is exposed at the entrance of the cavity. Also, the microphone may not be inserted to the end of the cavity so that there is a space between the end of the cavity and the microphone. A hole may be located on the cavity sidewall so that sound can reach the microphone through this space. The sound receiving sections of the microphone are aligned with openings in the communications device.

Abstract: The present invention relates to a speaker for a vehicle and an installation structure therefor, and it is an object of the invention to enhance the speaker installation rigidity without impairing the acoustic characteristic of the speaker. The speaker installation structure comprises a speaker unit (1) for holding a speaker body (11) and having a plurality of claws (13) and a panel member (3) having an opening (4) and a plurality of slits (5). For the installation of the speaker unit (1), the plurality of claws (13) are inserted into the plurality of slits (5), respectively, and the speaker unit (1) is rotated in its circumferential direction. The opening (4) is made to be smaller than the diameter of a speaker housing (12) and to have at least three linear portions (41). Each of the slits (5) is formed outside the three linear portions (41) and inside an outer circumference of the speaker housing (12).

Abstract: In a vocal sound input apparatus for an automotive vehicle, both a receiving microphone and a noise collecting microphone are provided, both of the receiving microphone and the noise collecting microphone being arranged onto a predetermined portion of a vehicle body in such a manner that a direction of a sensitivity of the receiving microphone is opposite to that of the noise collecting microphone for the receiving microphone to enable to receive a vocal sound from a speaker and for the noise collecting microphone to enable to collectively receive a noise of a surrounding of the speaker.

Abstract: A chair equipped the a speaker is provided with a frame that forms the structural skeleton of the chair, and a speaker unit that is installed to the frame; and wherein hollow pipe is used for the frame, and furthermore wherein the frame functions as an acoustical resonating section or acoustical space for the speaker.

Abstract: In a microphone mounting for a hands-free system in automotive vehicles, the microphone is mounted on the seat belt. In one embodiment the microphone is seated in a sheath which is fastened to the upper belt deflection and through which the belt can freely pass. The sheath consists of two mutually displaceable flat sleeves, of which the lower one accommodates the microphone whose position relative to the passenger's mouth can be adjusted in an optimum way by a mutual displacement of the two sleeves. In another embodiment the microphone is provided at its side facing the belt with contacts that are brought into electrical contact with conducting wires integrated into the belt so as to be connected to the telephone circuit.