EP0910225A2 - Microphone arrangement for helmet,and helmet with such an arrangement - Google Patents

Microphone arrangement for helmet,and helmet with such an arrangement Download PDF

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Publication number
EP0910225A2
EP0910225A2 EP98402575A EP98402575A EP0910225A2 EP 0910225 A2 EP0910225 A2 EP 0910225A2 EP 98402575 A EP98402575 A EP 98402575A EP 98402575 A EP98402575 A EP 98402575A EP 0910225 A2 EP0910225 A2 EP 0910225A2
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EP
European Patent Office
Prior art keywords
helmet
circuit
transducer
filtering
microphone
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP98402575A
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German (de)
French (fr)
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EP0910225A3 (en
Inventor
Philippe Abraham
Khaled Ben Hellal
Monique Mitte
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elno Societe Nouvelle SAS
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Elno Societe Nouvelle SAS
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Publication date
Application filed by Elno Societe Nouvelle SAS filed Critical Elno Societe Nouvelle SAS
Publication of EP0910225A2 publication Critical patent/EP0910225A2/en
Publication of EP0910225A3 publication Critical patent/EP0910225A3/en
Withdrawn legal-status Critical Current

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    • 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
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces

Definitions

  • the present invention relates to helmets and relates more particularly to motorcycle helmets such as those commonly used by the traffic police.
  • Known equipment of this type uses microphones individuals called osteophones who capture the vibrations of the skull when the user speaks.
  • the osteophone placed inside the shell of the helmet in contact with the head of the user is connected to a transmitter.
  • Osteophones have the disadvantage of being not very selective in so that they not only pick up the vibrations of the cranial body generated by the user's speech, but also external and internal noises helmet caused by the wind when the motorcyclist exceeds a speed determined.
  • the program obtained using an osteophone is made unusable at high speed because the signal to be transmitted is made unintelligible in particular due to the loss of the lips of the word.
  • the invention aims to remedy this drawback by creating a device microphone for motorcycle helmet that retains its performance signal transmission both at standstill and at high motorcycle speeds driving by the helmet user.
  • a microphone device for headphones motorcycle associated with means for filtering and amplifying the signals of output of the microphone to be emitted, characterized in that it comprises at least one transducer, placed in the interior lining of the helmet near the region upper or in one of the lateral parts of the edge of the anterior opening said helmet and an automatic means gain control circuit amplification according to the reception conditions of the acoustic signals picked up by the transducer.
  • Fig.1 there is shown in perspective a helmet 1 of a motorcyclist comprising a chin strap 2 articulated on the helmet 1 by axes 3.
  • the helmet shell 1 has a rigid outer casing 4 lined with interior trim 5.
  • the shell has an anterior opening 6 for the face of the user.
  • a transducer 9 of a microphone device In the upper region 7 of the edge 8 of the opening 6 is disposed a transducer 9 of a microphone device according to the invention.
  • this transducer is arranged in the middle of the upper region 7 of the edge 8 of the opening of the helmet.
  • transducer (s) are electret type.
  • the transducer 9 is connected to an electronic circuit 11 for filtering and amplification of the transducer signals.
  • This circuit 11 is in turn connected to a transceiver 12 via a line 13.
  • the transceiver 12 is advantageously arranged on the vehicle.
  • the transducer 9 is arranged at proximity of the upper region 7 of the edge 8 of the interior of the covering 5 in helmet polystyrene. It is engaged in a recess 15 formed in the front edge of the covering 5 with interposition of a damping block in foam 16.
  • the transducer is further protected by a windproof element 17 in plastic material.
  • the assembly thus formed is covered with a fabric 18.
  • the covering 5 is connected at its front end with the front edge of the shell 4 by means of a seal 19 which maintains the fabric 18 between the shell 4 and the covering 5.
  • the transducer 9 of the microphone device according to the invention is connected to an electronic circuit 11 for filtering and amplification.
  • This circuit delimited by a mixed input line includes a circuit 20 of filtering the output signal of the transducer connected to the output thereof and whose the output is connected to a variable gain pre-amplifier and filter circuit variable 21.
  • the output of this circuit 21 is connected by a circuit 22 for adaptation to the transceiver 12.
  • the output of the adapter circuit 22 is connected by the line 13 to the transceiver 12 as already indicated with reference to Fig. 1.
  • the transducer 9 receives the speech signals emitted by the carrier of the helmet, part of these signals being returned by the chin strap 2 while that a significant part reaches the transducer directly.
  • Transducer output signals are filtered by the filter circuit 20 and are applied on the one hand to the variable gain preamplifier 21 and on the other hand to the gain controller 23.
  • the controller 23 determines whether the signals emitted by the transducer 9 and filtered by circuit 20 have sufficient quality to be transmitted to the pre-amplifier variable gain and variable filtering without changing the gain and bandwidth of the preamplifier 21. If this is the case, the output signals of the circuit 20 are transmitted by the variable gain amplifier with variable filtering to the matching circuit 22 without neither gain nor bandwidth 21 changes from the control circuit 23.
  • the output signals of the adapter circuit 22 are applied to the input of the transceiver 12 and transmitted by the transmission part of this transceiver.
  • the transducer 9 not only receives speech signals from the helmet wearer but also exterior and interior noise signals to the helmet.
  • the gain controller 23 detects this situation and adapts the gain and the bandwidth of amplifier 21 with variable gain and variable filtering so that it can compensate for the quality of the signals transmitted to the transceiver 12.
  • the microphone device which has just been described with reference to Fig. 1 to 3 applies as well to a helmet with chin guard as to a helmet without chin guard.
  • Fig.4 there is shown a variant of microphone device according to the invention, according to which a helmet 21 of the hinged chin type 22 on the shell of the helmet 21 by means of pins 23 is provided in the part upper of its front opening 24 of a transducer 25 similar to that described with reference to Figs. 2 and 3.
  • the transducer 25 is connected by a line 26 to a circuit or electronic card amplification and filtering 27 which in turn is connected by a line 28 to a transceiver 29 outside the helmet.
  • the helmet of FIG. 4 also includes a visor 31 also hinged on the shell.
  • the microphone device in Fig. 4 differs from that described above in that it further comprises a detector 30 of the position of the visor connected to the amplification and filtering circuit 27.
  • the electronic circuit associated with the transducer 25 is shown in Fig. 5.
  • circuit 32 for filtering and transmitting the output signal from the transducer 25.
  • the output of circuit 32 is connected to a variable gain pre-amplifier with variable filtering 33, the output of which is in turn connected to an adapter circuit 34.
  • the output of the latter is connected to the transceiver 29.
  • the visor position detector 30 is connected by its output to a signal shaping circuit 35 connected to a control input of the variable gain preamplifier 33 via a function circuit hysteresis 36 whose role is to set for the triggering of the command of the pre-amplifier 33 a different threshold depending on whether the visor 31 is open or folded over the user's face.
  • the position detector 30, the shaping circuit 35 and the circuit with hysteresis 36 provide the same function as that of the gain controller circuit 23 of the embodiment of FIG. 3.
  • the opening of the visor 31 of the helmet is detected by the detector 30 which via the shaping circuit 35 and hysteresis function circuit 36 controls gain and bandwidth of the variable gain and variable filtering preamplifier 33 to adapt it to different environmental conditions due to the fact that the user's face helmet may be fully exposed or covered and therefore that the speech signals emitted by the user to the transducer 25 are accompanied by noises inside and outside the helmet especially when the user is traveling at high speed.
  • the headset when the visor 31 is closed on the user's face, the headset is a closed enclosure and speech signals are received to the transducer under different conditions and are transmitted by the variable gain pre-amplifier with variable filtering to the transceiver 29.
  • the position detector 30 which detects the closed position of the visor 31 lets the pre-amplifier 33 transmit the signals coming from the transducer 25 without causing any intervention on its gain or its bandwidth.
  • the card electronics comprising the amplification and filtering circuit on the one hand and the gain control circuit on the other hand is mounted in the headphones for example in a housing for the covering thereof.
  • this circuit electronics can also be placed outside the helmet.
  • the microphone device for helmet according to the invention exhibits clearly performance improved compared to existing devices.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Helmets And Other Head Coverings (AREA)
  • Headphones And Earphones (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

The transducer detects road and wind noise and uses the filtered response to adjust the gain control of the microphone amplifier.

Description

La présente invention est relative aux casques et se rapporte plus particulièrement aux casques de motocyclistes tels que ceux couramment utilisés par la police routière.The present invention relates to helmets and relates more particularly to motorcycle helmets such as those commonly used by the traffic police.

Les policiers motocyclistes ont généralement besoin de communiquer soit entre eux soit avec leur base telle qu'un véhicule de commandement ou encore avec leur quartier général.Motorcycle police generally need to communicate either between them or with their base such as a command vehicle or with their headquarters.

A cet effet leurs véhicules sont pourvus d'un équipement radio dont le microphone et les écouteurs sont disposés dans le casque de l'utilisateur afin de lui permettre de communiquer avec ses interlocuteurs en roulant.For this purpose their vehicles are provided with radio equipment, the microphone and earphones are placed in the user's helmet in order to allow him to communicate with his interlocutors while driving.

Les équipements connus de ce type font appel à des microphones particuliers appelés ostéophones qui captent les vibrations de la boíte crânienne de l'utilisateur lorsque celui-ci parle.Known equipment of this type uses microphones individuals called osteophones who capture the vibrations of the skull when the user speaks.

L'ostéophone, placé à l'intérieur de la coque du casque en contact avec la tête de l'utilisateur est connecté à un émetteur.The osteophone, placed inside the shell of the helmet in contact with the head of the user is connected to a transmitter.

Les ostéophones présentent l'inconvénient d'être peu sélectifs de sorte qu'ils captent non seulement les vibrations de la boíte crânienne engendrées par l'élocution de l'utilisateur, mais également les bruits extemes et internes au casque provoqués par le vent lorsque le motocycliste dépasse une vitesse déterminée.Osteophones have the disadvantage of being not very selective in so that they not only pick up the vibrations of the cranial body generated by the user's speech, but also external and internal noises helmet caused by the wind when the motorcyclist exceeds a speed determined.

Ainsi, l'émission obtenue en utilisant un ostéophone est rendue inexploitable à grande vitesse du fait que le signal à transmettre est rendu inintelligible en raison notamment de la perte des labiales de la parole.Thus, the program obtained using an osteophone is made unusable at high speed because the signal to be transmitted is made unintelligible in particular due to the loss of the lips of the word.

L'invention vise à remédier à cet inconvénient en créant un dispositif de microphone pour casque de motocycliste qui conserve ses performances d'émission de signaux aussi bien à l'arrêt qu'aux vitesses élevées de la motocyclette conduite par l'utilisateur du casque.The invention aims to remedy this drawback by creating a device microphone for motorcycle helmet that retains its performance signal transmission both at standstill and at high motorcycle speeds driving by the helmet user.

Elle a donc pour objet un dispositif de microphone pour casque de motocyclette associé à des moyens de filtrage et d'amplification des signaux de sortie du microphone à émettre, caractérisé en ce qu'il comporte au moins un transducteur, disposé dans l'habillage intérieur du casque à proximité de la région supérieure ou dans l'une des parties latérales du bord de l'ouverture antérieure dudit casque et un circuit de contrôle automatique de gain des moyens d'amplification en fonction des conditions de réception des signaux acoustiques captés par le transducteur. It therefore relates to a microphone device for headphones motorcycle associated with means for filtering and amplifying the signals of output of the microphone to be emitted, characterized in that it comprises at least one transducer, placed in the interior lining of the helmet near the region upper or in one of the lateral parts of the edge of the anterior opening said helmet and an automatic means gain control circuit amplification according to the reception conditions of the acoustic signals picked up by the transducer.

L'invention sera mieux comprise à la lecture de la description qui va suivre, faite en référence aux dessins annexés, donnés uniquement à titre d'exemple et sur lesquels:

  • La Fig.1 est une vue schématique en perspective avec arrachement partiel d'un casque muni d'un dispositif de microphone suivant l'invention ;
  • la Fig.2 est une vue partielle en coupe à plus grande échelle montrant la disposition du dispositif de microphone suivant l'invention dans le casque de la Fig.1 ;
  • la Fig.3 est un schéma synoptique du circuit de filtrage et d'amplification associé au transducteur du dispositif du microphone de la Fig.1 ;
  • la Fig.4 est une vue schématique d'un casque équipé d'un autre mode de réalisation du dispositif de microphone suivant l'invention et
  • la Fig.5 est un schéma synoptique du circuit de filtrage et d'amplification associé au dispositif de microphone de la Fig.4.
    • The invention will be better understood on reading the description which follows, given with reference to the appended drawings, given solely by way of example and in which:
  • Fig.1 is a schematic perspective view with partial cutaway of a helmet with a microphone device according to the invention;
  • Fig.2 is a partial sectional view on a larger scale showing the arrangement of the microphone device according to the invention in the helmet of Fig.1;
  • Fig.3 is a block diagram of the filtering and amplification circuit associated with the transducer of the microphone device of Fig.1;
  • Fig.4 is a schematic view of a helmet equipped with another embodiment of the microphone device according to the invention and
  • Fig.5 is a block diagram of the filtering and amplification circuit associated with the microphone device of Fig.4.

    • Sur la Fig.1 on a représenté en perspective un casque 1 de motocycliste comportant une mentonnière 2 articulée sur le casque 1 par des axes 3.In Fig.1 there is shown in perspective a helmet 1 of a motorcyclist comprising a chin strap 2 articulated on the helmet 1 by axes 3.

    La coque du casque 1 comporte une enveloppe extérieure rigide 4 doublée d'un habillage intérieur 5.The helmet shell 1 has a rigid outer casing 4 lined with interior trim 5.

    La coque comporte une ouverture antérieure 6 pour le visage de l'utilisateur.The shell has an anterior opening 6 for the face of the user.

    Dans la région supérieure 7 du bord 8 de l'ouverture 6 est disposé un transducteur 9 d'un dispositif de microphone suivant l'invention.In the upper region 7 of the edge 8 of the opening 6 is disposed a transducer 9 of a microphone device according to the invention.

    Dans le mode de réalisation de la Fig.1, ce transducteur est disposé au milieu de la région supérieure 7 du bord 8 de l'ouverture du casque.In the embodiment of Fig. 1, this transducer is arranged in the middle of the upper region 7 of the edge 8 of the opening of the helmet.

    On conçoit cependant qu'il pourrait également être disposé à un autre emplacement de la région supérieure 7 ou bien encore dans l'une des parties latérales 10 de ce bord.It is understood, however, that it could also be arranged for another location of the upper region 7 or else in one of the parts side 10 of this edge.

    Par ailleurs il est également possible d'envisager l'utilisation de plusieurs transducteurs disposés par rapport à un plan axial du casque, de sorte qu'en traitant les signaux issus de ces transducteurs par leur différence de phase, une direction du signal acoustique est favorisée.Furthermore, it is also possible to envisage the use of several transducers arranged relative to an axial plane of the helmet, so that by processing the signals from these transducers by their difference in phase, a direction of the acoustic signal is favored.

    De façon avantageuse et nullement limitative le ou les transducteurs sont de type électret. Advantageously and in no way limitative the transducer (s) are electret type.

    Le transducteur 9 est connecté à un circuit électronique 11 de filtrage et d'amplification des signaux du transducteur. Ce circuit 11 est à son tour connecté à un émetteur-récepteur 12 par l'intermédiaire d'une ligne 13. L'émetteur-récepteur 12 est avantageusement disposé sur le véhicule.The transducer 9 is connected to an electronic circuit 11 for filtering and amplification of the transducer signals. This circuit 11 is in turn connected to a transceiver 12 via a line 13. The transceiver 12 is advantageously arranged on the vehicle.

    En se référant à la Fig.2 on voit que le transducteur 9 est disposé à proximité de la région supérieure 7 du bord 8 de l'intérieur de l'habillage 5 en polystyrène du casque. Il est engagé dans un évidement 15 ménagé dans le bord antérieur de l'habillage 5 avec interposition d'un bloc d'amortissement en mousse 16.Referring to Fig. 2 it can be seen that the transducer 9 is arranged at proximity of the upper region 7 of the edge 8 of the interior of the covering 5 in helmet polystyrene. It is engaged in a recess 15 formed in the front edge of the covering 5 with interposition of a damping block in foam 16.

    Le transducteur est en outre protégé par un élément coupe-vent 17 en matière plastique. L'ensemble ainsi constitué est recouvert d'un tissu 18.The transducer is further protected by a windproof element 17 in plastic material. The assembly thus formed is covered with a fabric 18.

    L'habillage 5 est relié à son extrémité avant avec le bord antérieur de la coque 4 par l'intermédiaire d'un joint 19 qui assure le maintien du tissu 18 entre la coque 4 et l'habillage 5.The covering 5 is connected at its front end with the front edge of the shell 4 by means of a seal 19 which maintains the fabric 18 between the shell 4 and the covering 5.

    Comme représenté à la Fig.3, le transducteur 9 du dispositif de microphone suivant l'invention est relié à un circuit électronique 11 de filtrage et d'amplification. Ce circuit délimité par une ligne entrée mixte comporte un circuit 20 de filtrage du signal de sortie du transducteur connecté à la sortie de celui-ci et dont la sortie est connectée à un circuit pré-amplificateur à gain variable et de filtrage variable 21.As shown in Fig.3, the transducer 9 of the microphone device according to the invention is connected to an electronic circuit 11 for filtering and amplification. This circuit delimited by a mixed input line includes a circuit 20 of filtering the output signal of the transducer connected to the output thereof and whose the output is connected to a variable gain pre-amplifier and filter circuit variable 21.

    La sortie de ce circuit 21 est connectée par un circuit 22 d'adaptation à l'émetteur-récepteur 12. La sortie du circuit adaptateur 22 est connecté par la ligne 13 à l'émetteur-récepteur 12 comme déjà indiqué en référence à la Fig.1.The output of this circuit 21 is connected by a circuit 22 for adaptation to the transceiver 12. The output of the adapter circuit 22 is connected by the line 13 to the transceiver 12 as already indicated with reference to Fig. 1.

    Entre le circuit 20 de filtrage des signaux de sortie du transducteur et le pré-amplificateur 21 est en outre connecté un circuit contrôleur de gain 23 dont la sortie est connectée à une entrée de commande 24 du circuit pré-amplificateur à gain variable et de filtrage variable 21. Le fonctionnement de dispositif de microphone qui vient d'être décrit en référence au Fig.1 à 3 est le suivant:Between the circuit 20 for filtering the transducer output signals and the preamplifier 21 is further connected to a gain controller circuit 23 of which the output is connected to a control input 24 of the pre-amplifier circuit variable gain and variable filtering 21. The operation of the microphone which has just been described with reference to Fig. 1 to 3 is as follows:

    Le transducteur 9 reçoit les signaux de la parole émis par le porteur du casque, une partie de ces signaux étant renvoyée par la mentonnière 2 tandis qu'une partie importante atteint le transducteur directement.The transducer 9 receives the speech signals emitted by the carrier of the helmet, part of these signals being returned by the chin strap 2 while that a significant part reaches the transducer directly.

    Les signaux de sortie du transducteur sont filtrés par le circuit de filtrage 20 et sont appliqués d'une part au pré-amplificateur à gain variable 21 et d'autre part au contrôleur de gain 23. Transducer output signals are filtered by the filter circuit 20 and are applied on the one hand to the variable gain preamplifier 21 and on the other hand to the gain controller 23.

    Le contrôleur 23 détermine si les signaux émis par le transducteur 9 et filtrés par le circuit 20 ont une qualité suffisante pour être transmis au pré-amplificateur à gain variable et à filtrage variable sans modifier le gain et la bande passante du pré-amplificateur 21. Si tel est le cas les signaux de sortie du circuit 20 sont transmis par l'amplificateur à gain variable et à filtrage variable au circuit d'adaptation 22 sans que ni le gain ni la bande passante 21 ne subissent de modifications de la part du circuit de contrôle 23.The controller 23 determines whether the signals emitted by the transducer 9 and filtered by circuit 20 have sufficient quality to be transmitted to the pre-amplifier variable gain and variable filtering without changing the gain and bandwidth of the preamplifier 21. If this is the case, the output signals of the circuit 20 are transmitted by the variable gain amplifier with variable filtering to the matching circuit 22 without neither gain nor bandwidth 21 changes from the control circuit 23.

    Les signaux de sortie du circuit adaptateur 22 sont appliqués à l'entrée de l'émetteur-récepteur 12 et émis par la partie émission de cet émetteur-récepteur.The output signals of the adapter circuit 22 are applied to the input of the transceiver 12 and transmitted by the transmission part of this transceiver.

    Si au contraire, en raison du fonctionnement du transducteur 9 dans un environnement défavorable dû par exemple à l'utilisation du système de microphone par le porteur du casque roulant à grande vitesse, le transducteur 9 reçoit non seulement les signaux de la parole du porteur du casque mais également les signaux des bruits extérieurs et intérieurs au casque.If on the contrary, due to the operation of the transducer 9 in an unfavorable environment due for example to the use of the microphone system by the wearer of the helmet at high speed, the transducer 9 not only receives speech signals from the helmet wearer but also exterior and interior noise signals to the helmet.

    Le contrôleur de gain 23 détecte cette situation et adapte le gain et la bande passante de l'amplificateur 21 à gain variable et à filtrage variable de manière que celui-ci puisse compenser la qualité des signaux transmis vers l'émetteur-récepteur 12.The gain controller 23 detects this situation and adapts the gain and the bandwidth of amplifier 21 with variable gain and variable filtering so that it can compensate for the quality of the signals transmitted to the transceiver 12.

    Le dispositif de microphone qui vient d'être décrit en référence Fig.1 à 3 s'applique aussi bien à un casque à mentonnière qu'à un casque sans mentonnière.The microphone device which has just been described with reference to Fig. 1 to 3 applies as well to a helmet with chin guard as to a helmet without chin guard.

    Sur la Fig.4 on a représenté une variante de dispositif de microphone suivant l'invention, selon laquelle un casque 21 du type à mentonnière 22 articulée sur la coque du casque 21 au moyen d'axes 23 est pourvu dans la partie supérieure de son ouverture antérieure 24 d'un transducteur 25 analogue à celui décrit en référence aux Fig. 2 et 3. Comme dans le mode de réalisation précédent le transducteur 25 est relié par une ligne 26 à un circuit ou carte électronique d'amplification et de filtrage 27 qui à son tour est relié par une ligne 28 à un émetteur-récepteur 29 extérieur au casque.In Fig.4 there is shown a variant of microphone device according to the invention, according to which a helmet 21 of the hinged chin type 22 on the shell of the helmet 21 by means of pins 23 is provided in the part upper of its front opening 24 of a transducer 25 similar to that described with reference to Figs. 2 and 3. As in the previous embodiment the transducer 25 is connected by a line 26 to a circuit or electronic card amplification and filtering 27 which in turn is connected by a line 28 to a transceiver 29 outside the helmet.

    De façon avantageuse le casque de la Fig.4 comporte en outre une visière 31 articulée elle aussi sur la coque. Advantageously, the helmet of FIG. 4 also includes a visor 31 also hinged on the shell.

    Le dispositif de microphone de la Fig.4 diffère de celui décrit précédemment en ce qu'il comporte en outre un détecteur 30 de la position de la visière connecté au circuit 27 d'amplification et de filtrage.The microphone device in Fig. 4 differs from that described above in that it further comprises a detector 30 of the position of the visor connected to the amplification and filtering circuit 27.

    Le circuit électronique associé au transducteur 25 est représenté à la Fig.5.The electronic circuit associated with the transducer 25 is shown in Fig. 5.

    Il comporte comme dans le mode de réalisation de la Fig.3 un circuit 32 de filtrage et de transmission du signal de sortie du transducteur 25. La sortie du circuit 32 est connectée à un pré-amplificateur à gain variable et à filtrage variable 33 dont la sortie est à son tour connectée à un circuit adaptateur 34.As in the embodiment in Fig. 3, it includes a circuit 32 for filtering and transmitting the output signal from the transducer 25. The output of circuit 32 is connected to a variable gain pre-amplifier with variable filtering 33, the output of which is in turn connected to an adapter circuit 34.

    La sortie de ce dernier est connectée à l'émetteur-récepteur 29.The output of the latter is connected to the transceiver 29.

    Le détecteur 30 de position de la visière 31 est connecté par sa sortie à un circuit de mise en forme de signal 35 relié à une entrée de commande du pré-amplificateur à gain variable 33 par l'intermédiaire d'un circuit à fonction d'hystérésis 36 dont le rôle est de fixer pour le déclenchement de la commande du pré-amplificateur 33 un seuil différent selon que la visière 31 est ouverte ou rabattue sur le visage de l'utilisateur.The visor position detector 30 is connected by its output to a signal shaping circuit 35 connected to a control input of the variable gain preamplifier 33 via a function circuit hysteresis 36 whose role is to set for the triggering of the command of the pre-amplifier 33 a different threshold depending on whether the visor 31 is open or folded over the user's face.

    Le détecteur de position 30, le circuit de mise en forme 35 et le circuit à hystérésis 36 assurent la même fonction que celle du circuit contrôleur de gain 23 du mode de réalisation de la Fig.3.The position detector 30, the shaping circuit 35 and the circuit with hysteresis 36 provide the same function as that of the gain controller circuit 23 of the embodiment of FIG. 3.

    Dans le circuit de la Fig.5, l'ouverture de la visière 31 du casque est détectée par le détecteur 30 qui par l'intermédiaire du circuit de mise en forme 35 et du circuit à fonction d'hystérésis 36 commande le gain et la bande passante du pré-amplificateur à gain variable et à filtrage variable 33 pour l'adapter à des conditions d'environnement différentes dues au fait que le visage de l'utilisateur du casque peut se trouver entièrement à découvert ou à couvert et par conséquent que les signaux de la parole émis par l'utilisateur vers le transducteur 25 sont accompagnés de bruits intérieurs et extérieurs au casque surtout lorsque l'utilisateur roule à grande vitesse.In the circuit of Fig. 5, the opening of the visor 31 of the helmet is detected by the detector 30 which via the shaping circuit 35 and hysteresis function circuit 36 controls gain and bandwidth of the variable gain and variable filtering preamplifier 33 to adapt it to different environmental conditions due to the fact that the user's face helmet may be fully exposed or covered and therefore that the speech signals emitted by the user to the transducer 25 are accompanied by noises inside and outside the helmet especially when the user is traveling at high speed.

    En revanche lors de la fermeture de la visière 31 sur le visage de l'utilisateur, le casque constitue une enceinte fermée et les signaux de la parole parviennent au transducteur dans des conditions différentes et sont transmis par le pré-amplificateur à gain variable et à filtrage variable vers l'émetteur-récepteur 29. Le détecteur de position 30 qui détecte la position de fermeture de la visière 31 laisse le pré-amplificateur 33 transmettre les signaux provenant du transducteur 25 sans provoquer d'intervention sur son gain ou sa bande passante.However, when the visor 31 is closed on the user's face, the headset is a closed enclosure and speech signals are received to the transducer under different conditions and are transmitted by the variable gain pre-amplifier with variable filtering to the transceiver 29. The position detector 30 which detects the closed position of the visor 31 lets the pre-amplifier 33 transmit the signals coming from the transducer 25 without causing any intervention on its gain or its bandwidth.

    Dans les modes de réalisation qui viennent d'être décrits la carte électronique comprenant le circuit d'amplification et de filtrage d'une part et le circuit du contrôle de gain d'autre part est montée dans le casque, par exemple dans un logement de l'habillage de celui-ci. On conçoit cependant que ce circuit électronique peut être également disposé à l'extérieur du casque.In the embodiments which have just been described the card electronics comprising the amplification and filtering circuit on the one hand and the gain control circuit on the other hand is mounted in the headphones for example in a housing for the covering thereof. However, we can see that this circuit electronics can also be placed outside the helmet.

    Grâce à l'agencement qui vient d'être décrit, le dispositif de microphone pour casque suivant l'invention présente des performances nettement améliorées par rapport aux dispositifs existants.Thanks to the arrangement which has just been described, the microphone device for helmet according to the invention exhibits clearly performance improved compared to existing devices.

    Claims (6)

    Dispositif de microphone pour casque de motocyclette associé à des moyens de filtrage et d'amplification des signaux de sortie du microphone à émettre, caractérisé en ce qu'il comporte au moins un transducteur (9 ; 25), disposé dans l'habillage intérieur (5) du casque à proximité de la région supérieure (7) ou dans l'une des parties latérales (10) du bord (8) de l'ouverture antérieure (6) dudit casque et un circuit (23 ; 30 ; 35 ; 36) de contrôle automatique de gain des moyens d'amplification (21 ; 33) en fonction des conditions de réception des signaux acoustiques captés par le transducteur.Microphone device for motorcycle helmet associated with means for filtering and amplifying the microphone output signals to transmit, characterized in that it comprises at least one transducer (9; 25), arranged in the interior lining (5) of the helmet near the upper region (7) or in one of the lateral parts (10) of the edge (8) of the anterior opening (6) of said headset and an automatic gain control circuit (23; 30; 35; 36) amplification means (21; 33) according to the reception conditions of the acoustic signals picked up by the transducer. Dispositif de microphone pour casque de motocyclette associé à des moyens de filtrage et d'amplification des signaux de sortie du microphone à émettre suivant la revendication 1, caractérisé en ce que le transducteur (9 ; 25) est disposé dans l'habillage (5) au milieu de la région supérieure (7) du bord (8) de l'ouverture (6) du casque.Microphone device for motorcycle helmet associated with means for filtering and amplifying the microphone output signals to transmit according to claim 1, characterized in that the transducer (9; 25) is arranged in the covering (5) in the middle of the upper region (7) of the edge (8) the opening (6) of the helmet. Dispositif de microphone suivant l'une des revendications 1 et 2, caractérisé en ce que le transducteur (9) est logé dans un évidement (15) ménagé dans le bord antérieur de l'habillage (5) du casque avec interposition d'un bloc d'amortissement en mousse (16) et il est en outre protégé par un élément coupe-vent (17) en matière plastique.Microphone device according to either of Claims 1 and 2, characterized in that the transducer (9) is housed in a recess (15) formed in the front edge of the helmet cover (5) with the interposition of a block foam cushioning (16) and is further protected by a windbreaker (17) made of plastic. Dispositif de microphone suivant l'une des revendications 1 à 3, caractérisé en ce que le circuit de contrôle de gain (23) est connecté entre un circuit (20) de filtrage des signaux de sortie du transducteur (9) et un circuit (21) amplificateur à gain variable et à filtrage variable des moyens de filtrage et d'amplification.Microphone device according to one of Claims 1 to 3, characterized in that the gain control circuit (23) is connected between a circuit (20) for filtering the transducer output signals (9) and a circuit (21) variable gain amplifier with variable filtering of the filtering and amplification means. Dispositif de microphone suivant l'une des revendications 1 à 3, caractérisé en ce que le casque (21) étant du type à visière articulée, le circuit de contrôle de gain comporte un détecteur (30) de la position de la visière, la sortie dudit détecteur (30) étant connectée au circuit amplificateur à gain variable et à filtrage variable (33) par l'intermédiaire d'un circuit (35) de mise en forme et d'un circuit (36) à fonction d'hystérésis.Microphone device according to one of Claims 1 to 3, characterized in that the helmet (21) being of the type with an articulated visor, the circuit for gain control comprises a visor position detector (30), the output said detector (30) being connected to the variable gain amplifier circuit and to variable filtering (33) via a shaping circuit (35) and a circuit (36) with hysteresis function. Casque, notamment casque de motocycliste caractérisé en ce qu'il est équipé d'un dispositif de microphone suivant l'une des revendications 1 à 5.Helmet, in particular a motorcycle helmet, characterized in that it is equipped with a microphone device according to one of claims 1 to 5.
    EP98402575A 1997-10-17 1998-10-16 Microphone arrangement for helmet,and helmet with such an arrangement Withdrawn EP0910225A3 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9713057 1997-10-17
    FR9713057A FR2770075B1 (en) 1997-10-17 1997-10-17 IMPROVED MICROPHONE DEVICE FOR HELMET, AND HELMET EQUIPPED WITH SUCH A DEVICE

    Publications (2)

    Publication Number Publication Date
    EP0910225A2 true EP0910225A2 (en) 1999-04-21
    EP0910225A3 EP0910225A3 (en) 2000-03-15

    Family

    ID=9512383

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP98402575A Withdrawn EP0910225A3 (en) 1997-10-17 1998-10-16 Microphone arrangement for helmet,and helmet with such an arrangement

    Country Status (2)

    Country Link
    EP (1) EP0910225A3 (en)
    FR (1) FR2770075B1 (en)

    Citations (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR2384422A2 (en) * 1977-03-17 1978-10-13 Luc Bernard Motorcycle helmet with radio communication circuits - including microphone positioned adjacent to wearer's mouth
    DE3509658A1 (en) * 1985-03-18 1986-09-18 Drägerwerk AG, 2400 Lübeck Communication unit for a microtelephone set
    GB2182568A (en) * 1985-09-13 1987-05-20 Total Inert Maintenance & Engi Improvements in or relating to breathing apparatus
    EP0521218A1 (en) * 1991-07-05 1993-01-07 Shoei Kako Kabushiki Kaisha Communication wiring structure in helmet
    US5243659A (en) * 1992-02-19 1993-09-07 John J. Lazzeroni Motorcycle stereo audio system with vox intercom

    Patent Citations (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR2384422A2 (en) * 1977-03-17 1978-10-13 Luc Bernard Motorcycle helmet with radio communication circuits - including microphone positioned adjacent to wearer's mouth
    DE3509658A1 (en) * 1985-03-18 1986-09-18 Drägerwerk AG, 2400 Lübeck Communication unit for a microtelephone set
    GB2182568A (en) * 1985-09-13 1987-05-20 Total Inert Maintenance & Engi Improvements in or relating to breathing apparatus
    EP0521218A1 (en) * 1991-07-05 1993-01-07 Shoei Kako Kabushiki Kaisha Communication wiring structure in helmet
    US5243659A (en) * 1992-02-19 1993-09-07 John J. Lazzeroni Motorcycle stereo audio system with vox intercom

    Also Published As

    Publication number Publication date
    EP0910225A3 (en) 2000-03-15
    FR2770075A1 (en) 1999-04-23
    FR2770075B1 (en) 2000-12-22

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