WO1997026774A1 - Sound recording apparatuses and sound recording and reproducing apparatuses - Google Patents

Sound recording apparatuses and sound recording and reproducing apparatuses Download PDF

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Publication number
WO1997026774A1
WO1997026774A1 PCT/FR1997/000072 FR9700072W WO9726774A1 WO 1997026774 A1 WO1997026774 A1 WO 1997026774A1 FR 9700072 W FR9700072 W FR 9700072W WO 9726774 A1 WO9726774 A1 WO 9726774A1
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WO
WIPO (PCT)
Prior art keywords
support
axis
symmetry
face
sound
Prior art date
Application number
PCT/FR1997/000072
Other languages
French (fr)
Inventor
Frédéric Zurcher
Original Assignee
Prescom
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 Prescom filed Critical Prescom
Priority to AU13141/97A priority Critical patent/AU1314197A/en
Publication of WO1997026774A1 publication Critical patent/WO1997026774A1/en

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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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/342—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems

Definitions

  • the invention relates to sound pickup devices and sound pickup and playback devices.
  • the audio conference device is placed in the center of the table around which the interlocutors are gathered on each site. It includes a central loudspeaker, the axis of symmetry of which coincides with the axis of symmetry of the device, and a sound receiving device comprising n microphones distributed regularly over a circumference perpendicular to the axis of symmetry of the device and centered on it. The microphones are oriented downwards, facing a flat surface reflecting sound waves.
  • the object of the devices and methods of the aforementioned applications is to avoid as much as possible a coupling occurring between the signals emitted by the loudspeaker and those received by the microphones.
  • This object can be substantially achieved by appropriately arranging the various elements of the device or by implementing electronic methods for processing the transmitted and received signals described in the aforementioned documents. If the results provided are very satisfactory, they are not yet optimum and we wish to continue improving the quality of decoupling. A problem actually persists which is that of fixing the microphones to the device. This fixing must be solid without, however, the fixing means in any way detracting from the quality of the decoupling.
  • the vibrations generated outside the device for example in the table on which it rests, also produce noise if they reach the microphones.
  • the present invention aims to overcome these drawbacks by proposing a device in which the attachment of the microphones considerably reduces the coupling between the microphones and the external elements other than the ambient air, thus making it possible to further improve the performance of the device.
  • the present invention therefore relates to a sound pickup device comprising a support, a device for receiving sounds whose wavelength belongs to a predetermined range, and means for immobilizing the device relative to the support.
  • the apparatus is characterized in that said means are made of vibration absorbing material whose wavelength belongs to a range comprising at least the predetermined range.
  • the aforementioned wavelength range may for example be the extended telephone band, the range of which ranges from 50 to 7,000 Hz.
  • said material is flexible, the device being arranged so that this material is compressed when the device is in working condition.
  • the immobilization means comprise at least two different vibration-absorbing materials having non-identical absorption ranges, the immobilization means comprising respective layers of these materials alternated substantially from the device to the support.
  • the apparatus having an axis of symmetry coincident with the axis of symmetry of the receiving device, the immobilization means have for axis said axis of symmetry.
  • the means for immobilizing the reception device in no way alter the symmetry properties of the entire apparatus.
  • the immobilization means comprise superimposed plates each consisting of at least one of said materials.
  • FIG. 4 is a view in section in elevation of the elements intended to fill the support of FIG. 2.
  • Figure 1 shows an embodiment of a sound recording and restoring device according to the invention.
  • the device here is an audio conference device of the type described in the aforementioned patent applications and implementing the methods they set out.
  • the characteristics of the constitution of this device 1 which are already known by these documents will not be reproduced in detail here.
  • the device 1 comprises a base 2 and a sound emission device 3 connected to the base 2 by four spacers 4.
  • the sound emission device is here a loudspeaker.
  • the apparatus 1 further comprises a sound reception device housed in the support 5 integral with the base 2.
  • the sounds received and emitted by the aforementioned reception and emission devices have a wavelength belonging to a predetermined range.
  • this is the aforementioned extended telephone band, taking into account the use of the device within the framework of an audio conference.
  • the support 5 comprises a housing 21 and a cover 6 between which are arranged the immobilization means.
  • the sound receiving device comprises at least one sensor.
  • this device comprises four sensors each consisting of a microphone 7 of a known type.
  • Each microphone 7 has a cylindrical shape with a height of 5 mm and a diameter of 10 mm.
  • the four microphones 7 are in the same plane orthogonal to the axis of symmetry 8 of the device 1 and are all at the same distance from this axis 8.
  • Each microphone 7 has a face 9 receiving sounds, horizontal and directed towards bottom of appliance 1.
  • the sound reception device comprises a support element 22 by means of which the device is immobilized with respect to the support 5.
  • This element consists of a flexible printed circuit 0.2 mm thick on which the terminals are soldered of the four microphones 7. Before welding, the microphones 7 are applied flat on the printed circuit 22.
  • the support 5 and the sound receiving device have an axis of symmetry coincident with the axis of symmetry 8 of the device 1.
  • the housing 21 and the cover 6 are fixed to each other by fixing means symmetrical about this axis of symmetry. These fixing means comprise a screw 40 extending along this axis of symmetry.
  • the base 35 of the housing comprises four circular orifices 10 equidistant from the axis 8 and opposite which the receiving faces 9 of the microphones 7 are arranged.
  • the centers of the opposite orifices 10 are 28 mm apart. This distance, taking into account the electronic means used, gives the sound receiving device omnidirectionality in the horizontal plane for the entire enlarged telephone band with irregularities depending on the orientation of the sound source relative to the device 1 less than + or - 1.5 dB whatever the frequency zone.
  • the base 35 also has four tapped holes 11 each receiving a screw not shown 2.5 mm in diameter, diametrically distant from 13 mm and arranged so as to be each equidistant from the nearest orifices 10.
  • the holes 11 are used to fix the housing 21 on the base 2.
  • Their staggered arrangement relative to the orifices 10 allows the mechanical vibrations possibly propagated from the base 2 to the housing 21 through the screws to be symmetrical with respect to to the four microphones 7 and arrive at them with the lowest possible intensity.
  • connection cables 13 With reference to FIGS. 2 to 4, four smooth openings 12 with a diameter of 3 mm allow the passage of the connection means between the printed circuit 22 and the electronic equipment located in the base 2, these means here being connection cables 13. It there are in reality only those cables 13 passing through two diametrically opposite openings 12. There are, however, four openings 12 to maintain symmetry.
  • Each cable 13 consists of a pair of wires and a screen. One of the cables is connected to two microphones 7 diametrically opposite, the other cable being connected to the other two microphones.
  • the base 14 of the housing 21 is narrow with a diameter of 18 mm. This configuration allows the microphones 7 placed opposite the orifices 10 to be insensitive to any sound source placed below or in the base.
  • the apparatus 1 comprises means for immobilizing the device for receiving sounds with respect to the support 5.
  • the immobilization means are made of vibration absorbing material whose wavelength belongs to a range comprising at least the predetermined range, namely here the extended telephone band.
  • the immobilization means comprise superimposed plates. More specifically, the plates have the shape of washers 15, 18, 25 and 26 having an outside diameter substantially equal to the inside diameter of the housing 21.
  • the printed circuit 22 has a diameter 2 mm smaller than that of the washers so that it is not in contact with the support 5.
  • the apparatus 1 comprises four washers.
  • the lower washer 15 consists of a layer of very flexible foam 16 surmounted by a layer of flexible rubber 17.
  • this washer When not compressed, this washer has a thickness of 4.6 mm.
  • On the washer 15 is a washer 18 made of rubber which is less flexible than the rubber 16 and 3 mm thick.
  • the washer 18 is covered by the printed circuit 22.
  • the washers 15 and 18 are pierced with four holes 19 of 9.5 mm in diameter centered in front of the orifices 10 of the housing 21.
  • the microphones 7 are forced into the holes 19 of the washers until the whole of the printed circuit presses well flat on the washer 18.
  • the forceful insertion of the microphones of diameter 10 mm in the holes of diameter 9.5 mm of the washers ensures excellent lateral stability of the microphones 7 and a good centering of the latter facing the holes 10.
  • the washer 25 identical to the washer 17, the layer of very flexible foam 27 surmounted by a layer of flexible rubber 28, the total thickness of this washer being 2.3 mm.
  • the immobilization means thus comprise at least two different vibration absorbing materials constituting the aforementioned material. These materials, due to their different natures, have non-identical absorption ranges.
  • the immobilization means have the axis 8 as an axis of symmetry.
  • All the washers and the printed circuit 22 have a central orifice 30 through which extends the aforementioned screw ensuring the fixing of the cover 6 to the housing 21.
  • the diameter of this orifice is greater than that of the fixing screw so that the screw is not in contact with the washers or with the printed circuit.
  • This screw has a diameter of 3 mm. Its flat head is located in the cavity 23 of the base 14 of the housing 21. The screw passes through the cavity of the support 5 along the axis 8 to reach the threaded hole 24 of the cover.
  • the cables 13 extend into the central orifice 30 substantially orthogonally to the washers, this orifice being arranged so that its diameter is sufficient to allow the passage of the cables without them being in contact with the washers.
  • the immobilization means thus comprise respective layers of materials alternating substantially from the sound receiving device to the support 5, either above or below the printed circuit 22.
  • the washers 15, 18 constitute a first part of the immobilization means which extends between the underside of the printed circuit and the base 35
  • the washers 25, 26 constitute a second part of the immobilization means which extends between the upper face of the printed circuit and the inner face 31 of the cover 6.
  • the immobilization means are in contact with the entire surface of the microphones 7 with the exception of the receiving face 9. Its constitution from foam and rubber means that the material constituting the immobilization means is flexible.
  • the uncompressed thickness of the immobilization means shown in Figure 4 is 14.8 mm.
  • the thickness of the washer 18 does not vary appreciably.
  • the thickness of the washers 15 and 25 passes from 4.6 mm to 2.6 mm and the washer 26 sees its thickness pass from 2.3 mm to 1.3 mm.
  • the thickness of the stack and the materials used for the washers are such that when the stack is crushed as much as possible by tightening the screw
  • the grooves 32 are engaged in the respective ribs 33 so that they prevent rotation of the cover relative to the housing 21 around the axis 8 .
  • the damping of vertical mechanical vibrations is ensured by the fact that the microphones 7 are suspended in a stack of layers of materials of different flexibility subjected to a uniform pressure.
  • the alternation of layers of flexibility and different elasticities means that all the vibrations of the wavelength band considered are absorbed.
  • the lower layer of the washer 25 is sufficiently thick and flexible so that the terminals soldered on the flexible printed circuit do not create a pressure discontinuity.
  • the entire apparatus 1 remains symmetrical with respect to the axis 8 so that any residual mechanical vibrations (the source of which is notably the loudspeaker which is also symmetrical with respect to the axis 8) arrive substantially in phase and with the same intensity on the different microphones 7 and can thus be eliminated by the electronic signal processing device.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • General Health & Medical Sciences (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

An apparatus comprising a holder (5), a sound pick-up device with a wavelength within a predetermined range, and means for immobilising the device relative to the holder (5). The immobilising means consist of a vibration absorbing material with a wavelength within a range that includes at least said predetermined range.

Description

Appareils de prise de son et appareils de prise de son et de restitution de son Sound recording devices and sound recording and reproducing devices
L'invention concerne les appareils de prise de son et les appareils de prise et de restitution de son.The invention relates to sound pickup devices and sound pickup and playback devices.
Elle concerne notamment les appareils et systèmes décrits dans les demandes de brevet référencées respectivement FR-A-2 682 251 et n° 93 03216. Ces demandes visent notamment des appareils d'audioconférence permettant à deux groupes d'interlocuteurs réunis en deux sites différents de communiquer librement comme s'ils étaient sur le même lieu.It relates in particular to the devices and systems described in the patent applications referenced respectively FR-A-2 682 251 and No. 93 03216. These requests relate in particular to audio conferencing devices allowing two groups of interlocutors united in two different sites to communicate freely as if they were in the same place.
L'appareil d'audioconférence est disposé au centre de la table autour de laquelle les interlocuteurs sont réunis sur chaque site. Il comprend un haut-parleur central, dont l'axe de symétrie est confondu avec l'axe de symétrie de l'appareil, et un dispositif de réception de sons comportant n microphones répartis régulièrement sur une circonférence perpendiculaire à l'axe de symétrie de l'appareil et centrée sur ce dernier. Les microphones sont orientés vers le bas, face à une surface plane réfléchissant les ondes sonores.The audio conference device is placed in the center of the table around which the interlocutors are gathered on each site. It includes a central loudspeaker, the axis of symmetry of which coincides with the axis of symmetry of the device, and a sound receiving device comprising n microphones distributed regularly over a circumference perpendicular to the axis of symmetry of the device and centered on it. The microphones are oriented downwards, facing a flat surface reflecting sound waves.
L'objet des dispositifs et des procédés des demandes précitées est d'éviter au maximum que ne se produise un couplage entre les signaux émis par le haut- parleur et ceux reçus par les microphones. Ce but peut être sensiblement atteint en disposant de façon adaptée les différents éléments de l'appareil ou en mettant en oeuvre des procédés électroniques de traitement des signaux émis et reçus décrits dans les documents précités. Si les résultats fournis sont très satisfaisants, ils ne sont pas encore optimum et l'on souhaite continuer à améliorer la qualité du découplage. Un problème persiste effectivement qui est celui de la fixation des microphones à l'appareil. Cette fixation doit être solide sans pour autant que les moyens de fixation ne nuisent en quoi que ce soit à la qualité du découplage.The object of the devices and methods of the aforementioned applications is to avoid as much as possible a coupling occurring between the signals emitted by the loudspeaker and those received by the microphones. This object can be substantially achieved by appropriately arranging the various elements of the device or by implementing electronic methods for processing the transmitted and received signals described in the aforementioned documents. If the results provided are very satisfactory, they are not yet optimum and we wish to continue improving the quality of decoupling. A problem actually persists which is that of fixing the microphones to the device. This fixing must be solid without, however, the fixing means in any way detracting from the quality of the decoupling.
En effet, il est actuellement impossible d'éviter qu'une partie de l'énergie produite par les vibrations de la membrane du haut-parleur ne soit transmise dans l'appareil lui-même et ne s'y propage sous forme de vibrations mécaniques jusqu'à atteindre le logement des microphones. Si ces vibrations arrivent jusqu'aux microphones eux-mêmes, elles génèrent des parasites s'ajoutant aux signaux utiles d'origine acoustique.Indeed, it is currently impossible to avoid that part of the energy produced by the vibrations of the speaker membrane is transmitted into the device itself and does not propagate there in the form of mechanical vibrations. until you reach the microphone housing. If these vibrations reach the microphones themselves, they generate parasites in addition to the useful acoustic signals.
De même, les vibrations générées à l'extérieur de l'appareil, par exemple dans la table sur lequel il repose, produisent aussi des parasites si elles parviennent jusqu'aux microphones.Likewise, the vibrations generated outside the device, for example in the table on which it rests, also produce noise if they reach the microphones.
La présente invention vise à pallier ces inconvénients en proposant un appareil dans lequel la fixation des microphones réduit considérablement le couplage entre les microphones et les éléments extérieurs autres que l'air ambiant, permettant ainsi d'améliorer encore les performances de l'appareil.The present invention aims to overcome these drawbacks by proposing a device in which the attachment of the microphones considerably reduces the coupling between the microphones and the external elements other than the ambient air, thus making it possible to further improve the performance of the device.
La présente invention vise donc un appareil de prise de son comprenant un support, un dispositif de réception de sons dont la longueur d'onde appartient à une gamme prédéterminée, et des moyens d'immobilisation du dispositif par rapport au support. Selon l'invention, l'appareil est caractérisé en ce que lesdits moyens sont constitués en matière absorbeuse de vibrations dont la longueur d'onde appartient à une gamme comprenant au moins la gamme prédéterminée.The present invention therefore relates to a sound pickup device comprising a support, a device for receiving sounds whose wavelength belongs to a predetermined range, and means for immobilizing the device relative to the support. According to the invention, the apparatus is characterized in that said means are made of vibration absorbing material whose wavelength belongs to a range comprising at least the predetermined range.
C'est donc une matière absorbeuse de vibrations qui relie exclusivement le dispositif au support de sorte que les vibrations de la gamme concernée sont au moins fortement atténuées voire complètement absorbées lors de leur passage du support vers les microphones.It is therefore a vibration absorbing material which exclusively connects the device to the support so that the vibrations of the range concerned are at least strongly attenuated or even completely absorbed during their passage from the support towards the microphones.
Aucune transmission directe des vibrations n'est plus possible puisqu'aucun élément susceptible de les transmettre ne relie le support au dispositif. Dans le cas de l'appareil d*audioconférence précité, les vibrations mécaniques générées par le haut-parleur ou par la table dans le support voient leur effet s'atténuer considérablement ou disparaître.No direct transmission of vibrations is no longer possible since no element capable of transmitting them connects the support to the device. In the case of the above-mentioned audio conference device, the mechanical vibrations generated by the loudspeaker or by the table in the support see their effect diminish considerably or disappear.
La gamme de longueur d'onde précitée peut être par exemple la bande téléphonique élargie dont la gamme s'étend de 50 à 7.000 Hz.The aforementioned wavelength range may for example be the extended telephone band, the range of which ranges from 50 to 7,000 Hz.
Selon une version avantageuse de l'invention, ladite matière est souple, l'appareil étant agencé de sorte que cette matière se trouve comprimée lorsque l'appareil est en état de fonctionnement.According to an advantageous version of the invention, said material is flexible, the device being arranged so that this material is compressed when the device is in working condition.
Le fait de comprimer la matière absorbeuse permet d'améliorer encore ses performances d'absorption des vibrations et de renforcer la solidité de la fixation du dispositif au support. Selon une version préférée de l'invention, les moyens d'immobilisation comprennent au moins deux matériaux absorbeurs de vibrations différents ayant des gammes d'absorption non-identiques, les moyens d'immobilisation comprenant des couches respectives de ces matériaux alternées sensiblement depuis le dispositif jusqu'au support.Compressing the absorbent material makes it possible to further improve its vibration absorption performance and to reinforce the solidity of the fixing of the device to the support. According to a preferred version of the invention, the immobilization means comprise at least two different vibration-absorbing materials having non-identical absorption ranges, the immobilization means comprising respective layers of these materials alternated substantially from the device to the support.
On peut donc élargir la gamme d'absorption souhaitée en combinant différents matériaux au sein de ladite matière pour profiter des effets d'absorption propres à chacun des matériaux utilisés.It is therefore possible to widen the desired absorption range by combining different materials within said material to take advantage of the absorption effects specific to each of the materials used.
Selon une autre version avantageuse de l'invention, l'appareil présentant un axe de symétrie confondu avec l'axe de symétrie du dispositif de réception, les moyens d'immobilisation ont pour axe ledit axe de symétrie.According to another advantageous version of the invention, the apparatus having an axis of symmetry coincident with the axis of symmetry of the receiving device, the immobilization means have for axis said axis of symmetry.
En effet, dans l'hypothèse où il persiste des vibrations résiduelles en provenance du haut-parleur, il faut faire en sorte qu'elles arrivent avec la même phase à tout le dispositif de réception de sons de sorte que leur restitution par ce dernier puisse être annulée par le dispositif de traitement de l'appareil. Il est donc préférable que les moyens d'immobilisation du dispositif de réception n'altèrent en rien les propriétés de symétrie de l'ensemble de l'appareil.Indeed, in the event that residual vibrations from the loudspeaker persist, it is necessary to ensure that they arrive with the same phase in the entire sound receiving device so that their restitution by the latter can be canceled by the device's processing device. It is therefore preferable that the means for immobilizing the reception device in no way alter the symmetry properties of the entire apparatus.
Selon une autre version avantageuse de l'invention, les moyens d'immobilisation comprennent des plaques superposées constituées chacune d'au moins un desdits matériaux. D'autres caractéristiques et avantages de l'invention apparaîtront encore dans la description qui va suivre d'un mode préféré de réalisation. Aux dessins annexés donnés à titre d'exemple non limitatif : - la figure 1 est une vue schématique en élévation d'un mode de réalisation de l'appareil selon l'invention ; la figure 2 est une vue en coupe axiale parallèlement au plan de la figure 1 du support du dispositif de réception de son de la figure 1 ; - la figure 3 est une vue de dessus du logement de la figure 2 ; etAccording to another advantageous version of the invention, the immobilization means comprise superimposed plates each consisting of at least one of said materials. Other characteristics and advantages of the invention will become apparent in the description which follows of a preferred embodiment. In the accompanying drawings given by way of nonlimiting example: - Figure 1 is a schematic elevational view of an embodiment of the apparatus according to the invention; Figure 2 is an axial sectional view parallel to the plane of Figure 1 of the support of the sound receiving device of Figure 1; - Figure 3 is a top view of the housing of Figure 2; and
- la figure 4 est une vue en coupe en élévation des éléments destinés à remplir le support de la figure 2.FIG. 4 is a view in section in elevation of the elements intended to fill the support of FIG. 2.
La figure 1 présente un mode de réalisation d'un appareil de prise et restitution de son selon l'invention. L'appareil est ici un appareil d'audioconférence du type de ceux décrits dans les demandes de brevets précitées et mettant en oeuvre les procédés qu'elles énoncent. Les caractéristiques de la constitution de cet appareil 1 qui sont déjà connues par ces documents ne seront pas reproduites en détail ici.Figure 1 shows an embodiment of a sound recording and restoring device according to the invention. The device here is an audio conference device of the type described in the aforementioned patent applications and implementing the methods they set out. The characteristics of the constitution of this device 1 which are already known by these documents will not be reproduced in detail here.
L'appareil 1 comprend un socle 2 et un dispositif d'émission de sons 3 relié au socle 2 par quatre entretoises 4. Le dispositif d'émission de sons est ici un haut-parleur.The device 1 comprises a base 2 and a sound emission device 3 connected to the base 2 by four spacers 4. The sound emission device is here a loudspeaker.
L'appareil 1 comprend en outre un dispositif de réception de sons logé dans le support 5 solidaire du socle 2. Les sons reçus et émis par les dispositifs de réception et d'émission précités ont une longueur d'onde appartenant à une gamme prédéterminée. Il s'agit dans cet exemple de la bande téléphonique élargie précitée, compte-tenu de l'utilisation de l'appareil dans le cadre d'une audioconférence.The apparatus 1 further comprises a sound reception device housed in the support 5 integral with the base 2. The sounds received and emitted by the aforementioned reception and emission devices have a wavelength belonging to a predetermined range. In this example, this is the aforementioned extended telephone band, taking into account the use of the device within the framework of an audio conference.
En référence aux figures 2 et 3, le support 5 comprend un logement 21 et un couvercle 6 entre lesquels sont disposés les moyens d'immobilisation.Referring to Figures 2 and 3, the support 5 comprises a housing 21 and a cover 6 between which are arranged the immobilization means.
En référence à la figure 4, le dispositif de réception de sons comprend au moins un capteur. Dans le présent exemple, ce dispositif comprend quatre capteurs constitués chacun par un microphone 7 d'un type connu. Chaque microphone 7 a une forme cylindrique avec une hauteur de 5 mm et un diamètre de 10 mm. Les quatre microphones 7 se trouvent dans un même plan orthogonal à l'axe de symétrie 8 de l'appareil 1 et sont tous à la même distance de cet axe 8. Chaque microphone 7 présente une face 9 réceptrice des sons, horizontale et dirigée vers le bas de l'appareil 1.Referring to Figure 4, the sound receiving device comprises at least one sensor. In the present example, this device comprises four sensors each consisting of a microphone 7 of a known type. Each microphone 7 has a cylindrical shape with a height of 5 mm and a diameter of 10 mm. The four microphones 7 are in the same plane orthogonal to the axis of symmetry 8 of the device 1 and are all at the same distance from this axis 8. Each microphone 7 has a face 9 receiving sounds, horizontal and directed towards bottom of appliance 1.
Le dispositif de réception de sons comprend un élément de soutien 22 par l'intermédiaire duquel le dispositif est immobilisé par rapport au support 5. Cet élément est constitué d'un circuit imprimé souple d'épaisseur 0,2 mm sur lequel sont soudées les bornes des quatre microphones 7. Avant soudure, les microphones 7 sont appliqués bien à plat sur le circuit imprimé 22.The sound reception device comprises a support element 22 by means of which the device is immobilized with respect to the support 5. This element consists of a flexible printed circuit 0.2 mm thick on which the terminals are soldered of the four microphones 7. Before welding, the microphones 7 are applied flat on the printed circuit 22.
Le support 5 et le dispositif de réception de son présentent un axe de symétrie confondu avec l'axe de symétrie 8 de l'appareil 1. Le logement 21 et le couvercle 6 sont fixés l'un à l'autre par des moyens de fixation symétriques par rapport à cet axe de symétrie. Ces moyens de fixation comprennent une vis 40 s'étendant suivant cet axe de symétrie. En référence aux figures 2 et 3, la base 35 du logement comprend quatre orifices circulaires 10 équidistants de l'axe 8 et en regard desquels sont disposées les faces réceptrices 9 des microphones 7. Les centres des orifices 10 opposées sont distants de 28 mm. Cette distance, compte tenu des moyens électroniques mis en oeuvre, donne au dispositif de réception de sons une omnidirectionnalité dans le plan horizontal pour toute la bande téléphonique élargie avec des irrégularités dépendant de l'orientation de la source sonore par rapport à l'appareil 1 inférieures à + ou - 1,5 dB quelle que soit la zone fréquentielle.The support 5 and the sound receiving device have an axis of symmetry coincident with the axis of symmetry 8 of the device 1. The housing 21 and the cover 6 are fixed to each other by fixing means symmetrical about this axis of symmetry. These fixing means comprise a screw 40 extending along this axis of symmetry. With reference to FIGS. 2 and 3, the base 35 of the housing comprises four circular orifices 10 equidistant from the axis 8 and opposite which the receiving faces 9 of the microphones 7 are arranged. The centers of the opposite orifices 10 are 28 mm apart. This distance, taking into account the electronic means used, gives the sound receiving device omnidirectionality in the horizontal plane for the entire enlarged telephone band with irregularities depending on the orientation of the sound source relative to the device 1 less than + or - 1.5 dB whatever the frequency zone.
La base 35 présente aussi quatre trous taraudés il recevant chacun une vis non représentée de 2,5 mm de diamètre, distants diamétralement de 13 mm et disposés de façon à être chacun équidistant des orifices 10 les plus proches. Les trous 11 servent à la fixation du logement 21 sur le socle 2. Leur disposition en quinconce par rapport aux orifices 10 permet que les vibrations mécaniques éventuellement propagées depuis le socle 2 vers le logement 21 à travers les vis se présentent de manière symétrique par rapport aux quatre microphones 7 et arrivent à ceux-ci avec l'intensité la plus faible possible.The base 35 also has four tapped holes 11 each receiving a screw not shown 2.5 mm in diameter, diametrically distant from 13 mm and arranged so as to be each equidistant from the nearest orifices 10. The holes 11 are used to fix the housing 21 on the base 2. Their staggered arrangement relative to the orifices 10 allows the mechanical vibrations possibly propagated from the base 2 to the housing 21 through the screws to be symmetrical with respect to to the four microphones 7 and arrive at them with the lowest possible intensity.
En référence aux figures 2 à 4, quatre ouvertures lisses 12 de diamètre 3 mm permettent le passage des moyens de raccordement entre le circuit imprimé 22 et les équipements électroniques se trouvant dans le socle 2 , ces moyens étant ici des câbles de raccordement 13. Il n'y a en réalité que ceux câbles 13 passant par deux ouvertures 12 diamétralement opposées. Il y a toutefois quatre ouvertures 12 pour conserver la symétrie. Chaque câble 13 est constitué d'une paire de fils et d'un blindage. L'un des câbles est relié à deux microphones 7 diamétralement opposés, l'autre câble étant relié aux deux autres microphones.With reference to FIGS. 2 to 4, four smooth openings 12 with a diameter of 3 mm allow the passage of the connection means between the printed circuit 22 and the electronic equipment located in the base 2, these means here being connection cables 13. It there are in reality only those cables 13 passing through two diametrically opposite openings 12. There are, however, four openings 12 to maintain symmetry. Each cable 13 consists of a pair of wires and a screen. One of the cables is connected to two microphones 7 diametrically opposite, the other cable being connected to the other two microphones.
L'embase 14 du logement 21 est étroite avec un diamètre de 18 mm. Cette configuration permet aux microphones 7 placés en regard des orifices 10 d'être insensibles à toute source sonore placée au-dessous ou dans le socle.The base 14 of the housing 21 is narrow with a diameter of 18 mm. This configuration allows the microphones 7 placed opposite the orifices 10 to be insensitive to any sound source placed below or in the base.
L'appareil 1 comprend des moyens d'immobilisation du dispositif de réception de sons par rapport au support 5. En référence à la figure 4, les moyens d'immobilisation sont constitués en matière absorbeuse de vibrations dont la longueur d'onde appartient à une gamme comprenant au moins la gamme prédéterminée, à savoir ici la bande téléphonique élargie.The apparatus 1 comprises means for immobilizing the device for receiving sounds with respect to the support 5. With reference to FIG. 4, the immobilization means are made of vibration absorbing material whose wavelength belongs to a range comprising at least the predetermined range, namely here the extended telephone band.
Les moyens d'immobilisation comprennent des plaques superposées. Plus précisément, les plaques ont la forme de rondelles 15, 18, 25 et 26 ayant un diamètre extérieur sensiblement égal au diamètre intérieur du logement 21. Le circuit imprimé 22 a un diamètre inférieur de 2 mm à celui des rondelles de sorte qu'il n'est pas en contact avec le support 5.The immobilization means comprise superimposed plates. More specifically, the plates have the shape of washers 15, 18, 25 and 26 having an outside diameter substantially equal to the inside diameter of the housing 21. The printed circuit 22 has a diameter 2 mm smaller than that of the washers so that it is not in contact with the support 5.
L'appareil 1 comprend quatre rondelles. La rondelle inférieure 15 est constituée d'une couche en mousse très souple 16 surmontée d'une couche de caoutchouc souple 17.The apparatus 1 comprises four washers. The lower washer 15 consists of a layer of very flexible foam 16 surmounted by a layer of flexible rubber 17.
Lorsqu'elle n'est pas comprimée, cette rondelle a une épaisseur de 4,6 mm. Sur la rondelle 15 se trouve une rondelle 18 en caoutchouc moins souple que le caoutchouc 16 et épaisse de 3 mm. La rondelle 18 est recouverte par le circuit imprimé 22.When not compressed, this washer has a thickness of 4.6 mm. On the washer 15 is a washer 18 made of rubber which is less flexible than the rubber 16 and 3 mm thick. The washer 18 is covered by the printed circuit 22.
Les rondelles 15 et 18 sont percées de quatre trous 19 de 9,5 mm de diamètre centrés en face des orifices 10 du logement 21. Les microphones 7 sont enfoncés en force dans les trous 19 des rondelles jusqu'à ce que l'ensemble du circuit imprimé appuie bien à plat sur la rondelle 18. L'enfoncement en force des microphones de diamètre 10 mm dans les trous de diamètre 9,5 mm des rondelles assure une excellente stabilité latérale des microphones 7 et un bon centrage de ces derniers face aux orifices 10.The washers 15 and 18 are pierced with four holes 19 of 9.5 mm in diameter centered in front of the orifices 10 of the housing 21. The microphones 7 are forced into the holes 19 of the washers until the whole of the printed circuit presses well flat on the washer 18. The forceful insertion of the microphones of diameter 10 mm in the holes of diameter 9.5 mm of the washers ensures excellent lateral stability of the microphones 7 and a good centering of the latter facing the holes 10.
Au-dessus et en contact avec le circuit imprimé 22 se trouve la rondelle 25 identique à la rondelle 17, la couche en mousse très souple 27 surmontée d'une couche de caoutchouc souple 28, l'épaisseur totale de cette rondelle étant 2,3 mm.Above and in contact with the printed circuit 22 is the washer 25 identical to the washer 17, the layer of very flexible foam 27 surmounted by a layer of flexible rubber 28, the total thickness of this washer being 2.3 mm.
Les moyens d'immobilisation comprennent ainsi au moins deux matériaux absorbeurs de vibrations différents constituant la matière précitée. Ces matériaux, de part leurs natures différentes ont des gammes d'absorption non identiques.The immobilization means thus comprise at least two different vibration absorbing materials constituting the aforementioned material. These materials, due to their different natures, have non-identical absorption ranges.
Par la forme des rondelles, les moyens d'immobilisation ont l'axe 8 pour axe de symétrie.By the shape of the washers, the immobilization means have the axis 8 as an axis of symmetry.
Toutes les rondelles ainsi que le circuit imprimé 22 présentent un orifice central 30 à travers lequel s'étend la vis précitée assurant la fixation du couvercle 6 au logement 21. Le diamètre de cet orifice est supérieur à celui de la vis de fixation de sorte que la vis n'est pas en contact avec les rondelles ni avec le circuit imprimé. Cette vis a un diamètre de 3 mm. Sa tête plate se trouve dans la cavité 23 de l'embase 14 du logement 21. La vis traverse la cavité du support 5 suivant l'axe 8 pour atteindre le trou taraudé 24 du couvercle.All the washers and the printed circuit 22 have a central orifice 30 through which extends the aforementioned screw ensuring the fixing of the cover 6 to the housing 21. The diameter of this orifice is greater than that of the fixing screw so that the screw is not in contact with the washers or with the printed circuit. This screw has a diameter of 3 mm. Its flat head is located in the cavity 23 of the base 14 of the housing 21. The screw passes through the cavity of the support 5 along the axis 8 to reach the threaded hole 24 of the cover.
Les câbles 13 s'étendent dans l'orifice central 30 sensiblement orthogonalement aux rondelles, cet orifice étant agencé de sorte que son diamètre est suffisant pour permettre le passage des câbles sans qu'ils soient en contact avec les rondelles.The cables 13 extend into the central orifice 30 substantially orthogonally to the washers, this orifice being arranged so that its diameter is sufficient to allow the passage of the cables without them being in contact with the washers.
L'agencement de la figure 4 est installé dans le support 5 des figures 2 et 3 de sorte que la rondelle inférieure 15 soit en contact avec la base 35 du logementThe arrangement of Figure 4 is installed in the support 5 of Figures 2 and 3 so that the lower washer 15 is in contact with the base 35 of the housing
21 et la rondelle supérieure 26 avec la face intérieure 31 du couvercle 6.21 and the upper washer 26 with the inner face 31 of the cover 6.
Les moyens d'immobilisation comprennent ainsi des couches respectives de matériaux alternées sensiblement depuis le dispositif de réception de sons jusqu'au support 5 que ce soit au-dessus ou au-dessous du circuit imprimé 22. De plus, les rondelles 15, 18 constituent une première partie des moyens d'immobilisation qui s'étend entre la face inférieure du circuit imprimé et la base 35, et les rondelles 25, 26 constituent une deuxième partie des moyens d'immobilisation qui s'étend entre la face supérieure du circuit imprimé et la face intérieure 31 du couvercle 6.The immobilization means thus comprise respective layers of materials alternating substantially from the sound receiving device to the support 5, either above or below the printed circuit 22. In addition, the washers 15, 18 constitute a first part of the immobilization means which extends between the underside of the printed circuit and the base 35, and the washers 25, 26 constitute a second part of the immobilization means which extends between the upper face of the printed circuit and the inner face 31 of the cover 6.
De plus, grâce à cette configuration, les moyens d'immobilisation sont en contact avec toute la surface des microphones 7 à l'exception de la face réceptrice 9. Sa constitution à partir de mousse et de caoutchouc fait que la matière constituant les moyens d'immobilisation est souple. L'épaisseur non comprimée des moyens d'immobilisation représentés sur la figure 4 est de 14,8 mm.In addition, thanks to this configuration, the immobilization means are in contact with the entire surface of the microphones 7 with the exception of the receiving face 9. Its constitution from foam and rubber means that the material constituting the immobilization means is flexible. The uncompressed thickness of the immobilization means shown in Figure 4 is 14.8 mm.
Lorsque la vis est serrée pour fixer le couvercle 6 au logement 21, la matière se trouve comprimée entre la face intérieure 31 du couvercle 6 et la base 35 du logement 21. Elle est donc comprimée lorsque l'appareil 1 est en état de fonctionnement.When the screw is tightened to fix the cover 6 to the housing 21, the material is compressed between the inner face 31 of the cover 6 and the base 35 of the housing 21. It is therefore compressed when the device 1 is in operating condition.
Au cours du serrage, la compression entraîne l'écrasement régulier de l'empilement de rondelles dont l'épaisseur totale n'est plus que de 9,7 mm, la face réceptrice des microphones 7 ne se trouvant plus qu'à 0,6 mm au-dessus de la base du logement 21. L'épaisseur de la rondelle 18 ne varie pas sensiblement. En revanche, l'épaisseur des rondelles 15 et 25 passe de 4,6 mm à 2,6 mm et la rondelle 26 voit son épaisseur passer de 2,3 mm à 1,3 mm.During tightening, compression results in regular crushing of the stack of washers whose total thickness is no more than 9.7 mm, the receiving face of the microphones 7 being only 0.6 mm above the base of the housing 21. The thickness of the washer 18 does not vary appreciably. On the other hand, the thickness of the washers 15 and 25 passes from 4.6 mm to 2.6 mm and the washer 26 sees its thickness pass from 2.3 mm to 1.3 mm.
L'épaisseur de l'empilement et les matériaux utilisés pour les rondelles sont tels que lorsque l'empilement est écrasé au maximum par serrage de la visThe thickness of the stack and the materials used for the washers are such that when the stack is crushed as much as possible by tightening the screw
40, il n'y a aucun contact entre les faces horizontales du couvercle 6 et du logement 21.40, there is no contact between the horizontal faces of the cover 6 and of the housing 21.
Lorsque la vis est serrée de sorte que le couvercle 6 est au moins très proche du logement, les rainures 32 sont engagées dans les nervures 33 respectives de sorte qu'elles interdisent la rotation du couvercle par rapport au logement 21 autour de l'axe 8. L'amortissement des vibrations mécaniques verticales est assuré par le fait que les microphones 7 sont suspendus dans un empilement de couches de matériaux de souplesses différentes soumis à une pression uniforme. L'alternance de couches de souplesses et d'élasticités différentes fait que toutes les vibrations de la bande de longueur d'onde considérée sont absorbées.When the screw is tightened so that the cover 6 is at least very close to the housing, the grooves 32 are engaged in the respective ribs 33 so that they prevent rotation of the cover relative to the housing 21 around the axis 8 . The damping of vertical mechanical vibrations is ensured by the fact that the microphones 7 are suspended in a stack of layers of materials of different flexibility subjected to a uniform pressure. The alternation of layers of flexibility and different elasticities means that all the vibrations of the wavelength band considered are absorbed.
La couche inférieure de la rondelle 25 est suffisamment épaisse et souple pour que les bornes soudées sur le circuit imprimé souple ne créent pas de discontinuité de pression.The lower layer of the washer 25 is sufficiently thick and flexible so that the terminals soldered on the flexible printed circuit do not create a pressure discontinuity.
L'ensemble de l'appareil 1 demeure symétrique par rapport à l'axe 8 de sorte que les éventuelles vibrations mécaniques résiduelles (dont la source est notamment le haut-parleur lui aussi symétrique par rapport à l'axe 8) arrivent sensiblement en phase et avec la même intensité sur les différents microphones 7 et peuvent ainsi être éliminées par le dispositif de traitement électronique des signaux.The entire apparatus 1 remains symmetrical with respect to the axis 8 so that any residual mechanical vibrations (the source of which is notably the loudspeaker which is also symmetrical with respect to the axis 8) arrive substantially in phase and with the same intensity on the different microphones 7 and can thus be eliminated by the electronic signal processing device.
Bien entendu, on pourra apporter à l'invention de nombreuses modifications et améliorations sans sortir du cadre de celle-ci. Of course, many modifications and improvements can be made to the invention without departing from the scope thereof.

Claims

REVENDICATIONS
1. Appareil de prise de son (1) comprenant un support (5) , un dispositif de réception de sons dont la longueur d'onde appartient à une gamme prédéterminée, et des moyens d'immobilisation du dispositif par rapport au support (5) , cet appareil étant caractérisé en ce que lesdits moyens sont constitués en matière absorbeuse de vibrations dont la longueur d'onde appartient à une gamme comprenant au moins la gamme prédéterminée.1. Sound recording device (1) comprising a support (5), a device for receiving sounds the wavelength of which falls within a predetermined range, and means for immobilizing the device relative to the support (5) , this device being characterized in that said means are made of vibration absorbing material whose wavelength belongs to a range comprising at least the predetermined range.
2. Appareil selon la revendication 1, caractérisé en ce que ladite matière est souple, l'appareil étant agencé de sorte que cette matière se trouve comprimée lorsque l'appareil est en état de fonctionnement.2. Apparatus according to claim 1, characterized in that said material is flexible, the apparatus being arranged so that this material is compressed when the apparatus is in working condition.
3. Appareil selon l'une des revendications 1 à 2, caractérisé en ce que les moyens d'immobilisation comprennent au moins deux matériaux absorbeurs de vibrations différents ayant des gammes d'absorption non identiques, les moyens d'immobilisation comprenant des couches respectives (16, 17, 18) de ces matériaux alternées sensiblement depuis le dispositif jusqu'au support (5).3. Apparatus according to one of claims 1 to 2, characterized in that the immobilization means comprise at least two different vibration-absorbing materials having non-identical absorption ranges, the immobilization means comprising respective layers ( 16, 17, 18) of these materials alternated substantially from the device to the support (5).
4. Appareil selon la revendication 3, caractérisé en ce que les moyens d'immobilisation comprennent des plaques (15, 18, 25, 26) superposées constituées chacune d'au moins un desdits matériaux.4. Apparatus according to claim 3, characterized in that the immobilization means comprise plates (15, 18, 25, 26) superimposed each consisting of at least one of said materials.
5. Appareil selon l'une des revendications i à 4, l'appareil présentant un axe de symétrie (8) confondu avec l'axe de symétrie du dispositif de réception, caractérisé en ce que les moyens d'immobilisation ont pour axe ledit axe de symétrie (8) . 5. Apparatus according to one of claims i to 4, the apparatus having an axis of symmetry (8) coincident with the axis of symmetry of the receiving device, characterized in that the immobilization means have for axis said axis of symmetry (8).
6. Appareil selon l'une des revendications 1 à 5, le dispositif de réception de sons comprenant au moins un capteur (7) présentant une face (9) réceptrice des sons, caractérisé en ce que les moyens d'immobilisation sont en contact avec toute la surface du capteur (7) à l'exception de la face réceptrice (9) .6. Apparatus according to one of claims 1 to 5, the sound receiving device comprising at least one sensor (7) having a face (9) receiving sounds, characterized in that the immobilization means are in contact with the entire surface of the sensor (7) except for the receiving face (9).
7. Appareil selon la revendication 6, caractérisé en ce que les moyens d'immobilisation présentent au moins un trou (19) dans lequel est enfoncé en force ledit capteur.7. Apparatus according to claim 6, characterized in that the immobilization means have at least one hole (19) in which said sensor is forcibly inserted.
8. Appareil selon l'une des revendications 1 à 7, caractérisé en ce que le dispositif de réception de sons comprend un élément de soutien (22) par l'intermédiaire duquel le dispositif est immobilisé par rapport au support (5).8. Apparatus according to one of claims 1 to 7, characterized in that the sound receiving device comprises a support element (22) through which the device is immobilized relative to the support (5).
9. Appareil selon la revendication 8, caractérisé en ce qu'une première partie des moyens d'immobilisation s'étend entre une première face de l'élément de soutien (22) et une première face (35) du support (5) , et une deuxième partie des moyens d'immobilisation s'étend entre une deuxième face de l'élément de soutien (22) et une deuxième face (31) du support (5) opposée à la première face du support (5) .9. Apparatus according to claim 8, characterized in that a first part of the immobilization means extends between a first face of the support element (22) and a first face (35) of the support (5), and a second part of the immobilization means extends between a second face of the support element (22) and a second face (31) of the support (5) opposite to the first face of the support (5).
10. Appareil selon la revendication 9, caractérisé en ce que le support (5) comprend un logement (21) et un couvercle (6) comprenant respectivement lesdites première (35) et deuxième (31) faces du support.10. Apparatus according to claim 9, characterized in that the support (5) comprises a housing (21) and a cover (6) respectively comprising said first (35) and second (31) faces of the support.
11. Appareil selon la revendication 10, caractérisé en ce que le support (5) présentant un axe de symétrie (8) confondu avec l'axe de symétrie du dispositif de réception de sons, caractérisé en ce que le logement (21) et le couvercle (6) sont fixés l'un à l'autre par des moyens de fixation symétrique par rapport à l'axe de symétrie (8) du dispositif de réception de sons.11. Apparatus according to claim 10, characterized in that the support (5) having an axis of symmetry (8) coincides with the axis of symmetry of the sound receiving device, characterized in that the housing (21) and the cover (6) are fixed to each other by means of symmetrical fixing with respect to the axis of symmetry (8) of the sound receiving device.
12. Appareil selon la revendication 11, caractérisé en ce que les moyens de fixation (40) s'étendent suivant ledit axe de symétrie (8) .12. Apparatus according to claim 11, characterized in that the fixing means (40) extend along said axis of symmetry (8).
13. Appareil selon les revendications 4 et 11 et selon l'une des revendications 1 à 12, caractérisé en ce que lesdites plaques (15, 18, 25, 26) présentent au moins un orifice (30) à travers lequel s'étendent lesdits moyens de fixation (40) , les dimensions de cet orifice étant supérieures à celles des moyens de fixation de sorte que ceux-ci ne sont pas en contact avec les plaques (15, 18, 25, 26) .13. Apparatus according to claims 4 and 11 and according to one of claims 1 to 12, characterized in that said plates (15, 18, 25, 26) have at least one orifice (30) through which extend said fixing means (40), the dimensions of this orifice being greater than those of the fixing means so that the latter are not in contact with the plates (15, 18, 25, 26).
14. Appareil selon la revendication 13, caractérisé en ce que les moyens de raccordement (13) du dispositif de réception de sons s'étendent dans ledit orifice (30) sensiblement orthogonalement aux plaques (15, 18, 25, 26), cet orifice étant agencé de sorte que ses dimensions sont suffisantes pour permettre le passage des moyens de raccordement sans que ces moyens soient en contact avec les plaques.14. Apparatus according to claim 13, characterized in that the connection means (13) of the sound receiving device extend in said orifice (30) substantially orthogonally to the plates (15, 18, 25, 26), this orifice being arranged so that its dimensions are sufficient to allow passage of the connection means without these means being in contact with the plates.
15. Appareil selon l'une des revendications 11 à 14, caractérisé en ce que les moyens de fixation comprennent une vis (40) . 15. Apparatus according to one of claims 11 to 14, characterized in that the fixing means comprise a screw (40).
16. Appareil selon l'une des revendications 2 à 5, caractérisé en ce que l'un au moins des matériaux est un caoutchouc.16. Apparatus according to one of claims 2 to 5, characterized in that at least one of the materials is a rubber.
17. Appareil selon l'une des revendications 2 à 6, caractérisé en ce que l'un au moins des matériaux est une mousse.17. Apparatus according to one of claims 2 to 6, characterized in that at least one of the materials is a foam.
18. Appareil selon l'une des revendications 1 à 17, caractérisé en ce qu'il comprend en outre un dispositif d'émission de sons (3) ayant comme axe de symétrie l'axe de symétrie (8) de l'appareil. 18. Apparatus according to one of claims 1 to 17, characterized in that it further comprises a sound emission device (3) having as axis of symmetry the axis of symmetry (8) of the device.
PCT/FR1997/000072 1996-01-17 1997-01-15 Sound recording apparatuses and sound recording and reproducing apparatuses WO1997026774A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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FR96/00488 1996-01-17
FR9600488A FR2743685B1 (en) 1996-01-17 1996-01-17 SOUND-TAKING APPARATUS AND SOUND-TAKING AND SOUND-MAKING APPARATUS

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1181846A (en) * 1967-08-15 1970-02-18 Farrat Machinery Ltd Improvements in Vibration Absorbing Pads
EP0297975A1 (en) * 1987-06-30 1989-01-04 France Telecom Sound pick-up and reproduction device, particularly for audio conferences
JPH0544777A (en) * 1991-08-09 1993-02-23 Sharp Corp Vibration absorber
FR2702918A1 (en) * 1993-03-19 1994-09-23 Prescom Sarl Sound recording and reproducing apparatus, and its application to audio conference.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1181846A (en) * 1967-08-15 1970-02-18 Farrat Machinery Ltd Improvements in Vibration Absorbing Pads
EP0297975A1 (en) * 1987-06-30 1989-01-04 France Telecom Sound pick-up and reproduction device, particularly for audio conferences
JPH0544777A (en) * 1991-08-09 1993-02-23 Sharp Corp Vibration absorber
FR2702918A1 (en) * 1993-03-19 1994-09-23 Prescom Sarl Sound recording and reproducing apparatus, and its application to audio conference.
WO1994022277A1 (en) * 1993-03-19 1994-09-29 Prescom Sound pick-up and reproduction apparatus and use thereof for conference calls

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 17, no. 350 (M - 1438) 2 July 1993 (1993-07-02) *

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