EP0091874A1 - Method and device for wireless stereophonic transmission from a sound reproducing apparatus to loudspeakers - Google Patents

Method and device for wireless stereophonic transmission from a sound reproducing apparatus to loudspeakers Download PDF

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Publication number
EP0091874A1
EP0091874A1 EP83400718A EP83400718A EP0091874A1 EP 0091874 A1 EP0091874 A1 EP 0091874A1 EP 83400718 A EP83400718 A EP 83400718A EP 83400718 A EP83400718 A EP 83400718A EP 0091874 A1 EP0091874 A1 EP 0091874A1
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Prior art keywords
frequency
signal
enclosure
stereophonic
synthesizer
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EP83400718A
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German (de)
French (fr)
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Denis Marinier
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Individual
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/86—Arrangements characterised by the broadcast information itself
    • H04H20/88—Stereophonic broadcast systems
    • 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
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers

Definitions

  • the invention relates to a method and a device for transmitting to musical speakers, musical or other sound signals, wirelessly, from a so-called "high-fidelity" sound reproduction installation by means of a stereophonic transmission in frequency modulation.
  • radio relays allowing the use of acoustic speakers provided with a receiver and a low frequency amplifier, which receive a transmission from a transmitter located remotely, said transmitter transmitting an amplified signal from various accessories such as a record player, a radio receiver or the like.
  • This installation does not allow retransmission of stereophony.
  • the installation should have two transmitters, one for each channel (left and right), which would cause interference to reception and poor reproduction of the signals thus transmitted.
  • the invention aims to overcome these drawbacks by providing an installation in which the loudspeakers are completely independent, that is to say not connected by wire to a common preamplifier, while allowing quality stereophonic hearing.
  • a method according to the invention in that the "left" and “right” signals from the low-frequency stereophonic preamplifier are coded in a multiplexer and then used to frequency-modulate a high-frequency signal from a synthesizer which is itself amplified and sent thus modulated to a transmitting antenna and in that the transmitted signal is received by the receiving antennas specific to each enclosure, preamplified, demodulated, then decoded in each enclosure, only one of the two original low frequency signals being amplified and addressed to the loudspeakers of one enclosure, while in the other enclosure it is the second signal which is amplified and addressed to the loudspeakers.
  • the demodulation in each enclosure is controlled by a synthesizer adjusted to the same frequency as that of the emission.
  • the synthesizers are provided for selectively delivering several frequencies.
  • the device comprises a transmission unit 1, receiving the two low frequency signals "left” and "right” coming from one of the stereophonic playback devices (record player, tape recorder, radio receiver or other) and two loudspeakers 2, only one of which has been shown, and which each comprise a reception and decoding stage, a low-frequency amplification stage and three speakers.
  • the stereophonic playback devices record player, tape recorder, radio receiver or other
  • the loudspeakers 2 only one of which has been shown, and which each comprise a reception and decoding stage, a low-frequency amplification stage and three speakers.
  • the transmitting unit 1 comprises a low frequency preamplifier 3 with two channels, "left” and “right”; which transmits the two signals to a multiplexer 4.
  • the multiplexer 4 delivers a coded signal to a frequency modulator 6 which also receives a high frequency signal from a frequency synthesizer 5.
  • the modulated high frequency signal is then transmitted to a high frequency amplifier 7, then to a transmitting antenna 8.
  • Each acoustic enclosure 2 includes in its housing a reception antenna 9, which receives the modulated high-frequency signal transmitted by the antenna 8.
  • the received signal is transmitted to a high-frequency preamplifier 10 and amplified and then transmitted to a frequency demodulator 12 controlled by a frequency synthesizer 11.
  • the signal from the demodulator 12 is sent to a stereophonic decoder 13 which then reproduces by its outputs D and G the low frequency signals from the sound players.
  • a switch 14 then makes it possible to connect one or the other of the two outputs D or G of the decoder 13 to a low frequency amplification stage constituted by an amplifier 15 with possibly a preamplifier 17, both of them with a single channel.
  • the amplified low frequency signal is then sent to the speakers 16 of the speaker 2 to restore the "right" or "left” signal from the sound player.
  • Hearing in stereophony will be obtained by adjusting, by means of switches 14, one of the speakers 2 on the left channel and the other on the right channel.
  • Each speaker can be powered by an integrated battery or by its own power supply unit.
  • synthesizers for the device according to the invention is determined by the fact that the synthesizers deliver an extremely precise frequency which makes it possible to avoid interference with neighboring emissions.
  • the synthesizers of the device according to the invention can be adjusted in steps over a wide range of frequencies.
  • the synthesizers can be adjusted in 10 KHz steps between 100 and 110 MHz.
  • the wide choice of carrier frequencies thus authorized makes it possible to choose a free frequency in the event of disturbance by other emissions on the frequency previously chosen, such as in particular the remote control emissions of reduced models.
  • This adjustment can be carried out by the user of the high-fidelity system, using a button placed on the transmitting unit 1 and on each of the 2 receiving speakers.
  • a second button also placed on each enclosure 2 makes it possible to actuate the switch 14 to choose the channel which each enclosure will have to restore.

Abstract

Device intended for the stereophonic restoration of sound signals obtained from a sound reproducing apparatus, by acoustic chambers. It comprises a transmission unit (1) and at least two acoustic chambers (2), comprising an antenna (9), a high-frequency amplifier (10), a frequency synthesiser (11), which controls a demodulator (12), a decoder (13), a switch (14) permitting selection, depending on the chamber, of the signal corresponding to the channel intended to be reproduced, a low-frequency amplifier (15) and at least one loudspeaker (16). <IMAGE>

Description

L'invention concerne un procédé et un dispositif de transmission à des enceintes acoustiques, de signaux sonores musicaux ou autres, sans fil, à partir d'une installation de reproduction du son dite "Haute-fidélité" au moyen d'une émission stéréophonique en modulation de fréquence.The invention relates to a method and a device for transmitting to musical speakers, musical or other sound signals, wirelessly, from a so-called "high-fidelity" sound reproduction installation by means of a stereophonic transmission in frequency modulation.

Il est connu depuis longtemps de réaliser des installations "haute fidélité" stéréophoniques dont les enceintes acous:" tiques, comportant chacune un amplificateur basse fréquence, sont reliées par fil à un préamplificateur stéréophonique commun, dont les signaux d'entrée proviennent d'un tourne-disque, d'un récepteur radio ou "tuner" ou de tout autre appareil de reproduction du son en usage dans les chaînes "haute-fidélité".It has been known for a long time to produce stereophonic "high fidelity" installations, the acoustic speakers of which, each comprising a low frequency amplifier, are connected by wire to a common stereophonic preamplifier, whose input signals come from a turntable -disc, radio receiver or "tuner" or any other sound reproduction device in use in "high-fidelity" channels.

Une telle installation présente l'inconvénient d'imposer une liaison par fil entre les enceintes acoustiques et le préamplificateur commun, ce qui limite les possibilités de répartition des enceintes dans un local.Such an installation has the drawback of imposing a wire connection between the loudspeakers and the common preamplifier, which limits the possibilities of distributing the loudspeakers in a room.

De plus, lorsque les enceintes doivent être disposées à une distance importante de l'installation, les distorsions et la diaphonie sont d'autant augmentées. Si, en outre plusieurs salles doivent être équipées pour l'audition stéréophonique à partir de la même installation, le problème des fils se pose avec encore plus d'acuité car les distorsions augmentent avec la longueur des fils et les problèmes de diaphonie sont multipliés.In addition, when the speakers must be placed at a significant distance from the installation, the distortions and the crosstalk are all the more increased. If, in addition, several rooms have to be equipped for stereophonic hearing from the same installation, the problem of wires arises. poses with even more acuity because the distortions increase with the length of the wires and the crosstalk problems are multiplied.

On connaît en outre, notamment par le certificat d'utilité n°79 08462, des relais radiophoniques permettant d'utiliser des enceintes acoustiques pourvues d'un récepteur et d'un amplificateur basse fréquence, qui reçoivent une émission provenant d'un émetteur situé à distance, ledit émetteur transmettant un signal amplifié provenant de divers accessoires tels qu'un tourne-disque, un récepteur radio ou autre. Cette installation ne permet pas la retransmission de la stéréophonie. En effet, pour une telle retransmission, l'installation devrait disposer de deux émetteurs, un pour chaque voie (gauche et droite) ce qui entraînerait des interférences à la réception et une mauvaise restitution des signaux ainsi transmis.Also known, in particular from utility certificate No. 79 08462, radio relays allowing the use of acoustic speakers provided with a receiver and a low frequency amplifier, which receive a transmission from a transmitter located remotely, said transmitter transmitting an amplified signal from various accessories such as a record player, a radio receiver or the like. This installation does not allow retransmission of stereophony. In fact, for such retransmission, the installation should have two transmitters, one for each channel (left and right), which would cause interference to reception and poor reproduction of the signals thus transmitted.

L'invention a pour but de palier ces inconvénients en procurant une installation dans laquelle les enceintes acoustiques sont totalement indépendantes, c'est-à-dire non reliées par fil à un préamplificateur commun, tout en permettant une audition stéréophonique de qualité.The invention aims to overcome these drawbacks by providing an installation in which the loudspeakers are completely independent, that is to say not connected by wire to a common preamplifier, while allowing quality stereophonic hearing.

Ce but est atteint grâce à un procédé selon l'invention, en ce que les signaux "gauche" et "droite" issus du préamplificateur stéréophonique basse fréquence, sont codés dans un multiplexeur puis utilisés pour moduler en fréquence un signal haute fréquence issu d'un synthétiseur qui est, lui-même, amplifié et envoyé ainsi modulé à une antenne d'émission et en ce que le signal émis est reçu par les antennes réceptrices propres à chaque enceinte, préamplifié, démodulé, puis décodé dans chaque enceinte, un seul des deux signaux basse fréquence d'origine étant amplifié et adressé aux haut-parleurs d'une enceinte, tandis que dans l'autre enceinte c'est le second signal qui est amplifié et adressé aux haut-parleurs.This object is achieved by a method according to the invention, in that the "left" and "right" signals from the low-frequency stereophonic preamplifier are coded in a multiplexer and then used to frequency-modulate a high-frequency signal from a synthesizer which is itself amplified and sent thus modulated to a transmitting antenna and in that the transmitted signal is received by the receiving antennas specific to each enclosure, preamplified, demodulated, then decoded in each enclosure, only one of the two original low frequency signals being amplified and addressed to the loudspeakers of one enclosure, while in the other enclosure it is the second signal which is amplified and addressed to the loudspeakers.

Selon une réalisation préférentielle de l'invention, la démodulation dans chaque enceinte est commandée par un synthétiseur réglé sur la même fréquence que celui de l'émission.According to a preferred embodiment of the invention, the demodulation in each enclosure is controlled by a synthesizer adjusted to the same frequency as that of the emission.

L'invention concerne également un dispositif pour la mise en oeuvre du procédé selon l'invention, comportant

  • - une unité d'émission comportant un préamplificateur basse fréquence à deux voies, destiné à recevoir deux signaux basse fréquence d'un appareil de lecture du son ou d'un récepteur radio;
  • - un multiplexeur pour coder les signaux basse fréquence préamplifiés de manière à obtenir une fréquence pilote ;
  • - un synthétiseur de fréquence pouvant produire des signaux à haute fréquence déterminés;
  • - un modulateur pour moduler le signal HF issu du synthétiseur avec la fréquence pilote provenant du multiplexeur;
  • - un amplificateur haute fréquence destiné à amplifier le signal modulé et une antenne d'émission. Il comprend au moins deux enceintes acoustiques constituées chacune en unité de réception et comportant une antenne de réception, un amplificateur haute fréquence, un synthétiseur de fréquence, réglé sur la même fréquence que le synthétiseur de l'unité d'émission, qui commande un démodulateur pour démoduler ledit signal, un décodeur stéréophonique intermédiaire restituant les basses fréquences initiales, un commutateur permettant de sélectionner selon l'enceinte le signal correspondant à la voie destinée à être reproduite, un amplificateur basse fréquence amplifiant ledit signal et au moins un haut-parleur restituant le signal basse fréquence de la voie sélectionnée.
The invention also relates to a device for implementing the method according to the invention, comprising
  • - a transmission unit comprising a two-channel low-frequency preamplifier, intended to receive two low-frequency signals from a sound playback device or a radio receiver;
  • - a multiplexer for coding the preamplified low frequency signals so as to obtain a pilot frequency;
  • - a frequency synthesizer capable of producing determined high frequency signals;
  • - a modulator for modulating the HF signal from the synthesizer with the pilot frequency from the multiplexer;
  • - a high frequency amplifier intended to amplify the modulated signal and a transmitting antenna. It includes at least two loudspeakers each consisting of a reception unit and comprising a reception antenna, a high-frequency amplifier, a frequency synthesizer, set to the same frequency as the synthesizer of the transmission unit, which controls a demodulator to demodulate said signal, an intermediate stereophonic decoder reproducing the initial low frequencies, a switch making it possible to select, depending on the enclosure, the signal corresponding to the channel intended to be reproduced, a low frequency amplifier amplifying said signal and at least one speaker reproducing the low frequency signal of the selected channel.

Selon une réalisation préférentielle du dispositif selon l'invention, les synthétiseurs sont prévus pour délivrer sélectivement plusieurs fréquences.According to a preferred embodiment of the device according to the invention, the synthesizers are provided for selectively delivering several frequencies.

L'invention sera expliquée plus en détail au moyen d'un exemple de réalisation non limitatif décrit ci-après en regard du dessin annexé dont la figure unique représente schématiquement le dispositif selon l'invention.The invention will be explained in more detail by means of a non-limiting exemplary embodiment described below with reference to the appended drawing, the single figure of which schematically represents the device according to the invention.

Le dispositif selon la figure comporte une unité d'émission 1, recevant les deux signaux basse fréquence "gauche" et "droite" provenant de l'un des appareils de lecture stéréophonique (tourne-disque, magnétophone, récepteur radio ou autres) et deux enceintes acoustiques 2, dont une seule a été représentée, et qui comportent chacune un étage de réception et de décodage, un étage d'amplification basse fréquence et trois haut-parleurs.The device according to the figure comprises a transmission unit 1, receiving the two low frequency signals "left" and "right" coming from one of the stereophonic playback devices (record player, tape recorder, radio receiver or other) and two loudspeakers 2, only one of which has been shown, and which each comprise a reception and decoding stage, a low-frequency amplification stage and three speakers.

L'unité d'émission 1 comporte un préamplificateur basse fréquence 3 à deux voies, "gauche" et "droite"; qui transmet les deux signaux à un multiplexeur 4. Le multiplexeur 4 délivre un signal codé à un modulateur de fréquence 6 qui reçoit d'autre part un signal haute fréquence d'un synthétiseur de fréquence 5. Le signal haute fréquence modulé est alors transmis à un amplificateur haute fréquence 7, puis à une antenne d'émission 8.The transmitting unit 1 comprises a low frequency preamplifier 3 with two channels, "left" and "right"; which transmits the two signals to a multiplexer 4. The multiplexer 4 delivers a coded signal to a frequency modulator 6 which also receives a high frequency signal from a frequency synthesizer 5. The modulated high frequency signal is then transmitted to a high frequency amplifier 7, then to a transmitting antenna 8.

Chaque enceinte acoustique 2 comporte dans son boîtier une antenne de réception 9, qui capte le signal haute fréquence modulé émis par l'antenne 8.Each acoustic enclosure 2 includes in its housing a reception antenna 9, which receives the modulated high-frequency signal transmitted by the antenna 8.

Le signal reçu est transmis à un préamplificateur haute- fréquence 10 et amplifié puis transmis à un démodulateur de fréquence 12 commandé par un synthétiseur de fréquence 11.The received signal is transmitted to a high-frequency preamplifier 10 and amplified and then transmitted to a frequency demodulator 12 controlled by a frequency synthesizer 11.

Le signal issu du démodulateur 12 est envoyé à un décodeur stéréophonique 13 qui restitue alors par ses sorties D et G les signaux basse fréquence issus des lecteurs de son. Un commutateur 14 permet alors de relier l'une ou l'autre des deux sorties D ou G du décodeur 13 à un étage d'amplification basse fréquence constitué par un amplificateur 15 avec éventuellement un préamplificateur 17, tous deux à une seule voie. Le signal basse fréquence amplifié est alors adressé aux haut-parleurs 16 de l'enceinte 2 pour restituer le signal "droit" ou "gauche" issu du lecteur de son.The signal from the demodulator 12 is sent to a stereophonic decoder 13 which then reproduces by its outputs D and G the low frequency signals from the sound players. A switch 14 then makes it possible to connect one or the other of the two outputs D or G of the decoder 13 to a low frequency amplification stage constituted by an amplifier 15 with possibly a preamplifier 17, both of them with a single channel. The amplified low frequency signal is then sent to the speakers 16 of the speaker 2 to restore the "right" or "left" signal from the sound player.

L'audition en stéréophonie sera obtenue en réglant, au moyen des commutateurs 14, l'une des enceintes 2 sur la voie gauche et l'autre sur la voie droite.Hearing in stereophony will be obtained by adjusting, by means of switches 14, one of the speakers 2 on the left channel and the other on the right channel.

Chaque enceinte peut être alimentée par une batterie intégrée ou par un bloc secteur qui lui est propre.Each speaker can be powered by an integrated battery or by its own power supply unit.

Le choix de synthétiseurs pour le dispositif selon l'invention est déterminé par le fait que les synthétiseurs délivrent une fréquence extrêmement précise ce qui permet d'éviter les interférences avec des émissions voisines.The choice of synthesizers for the device according to the invention is determined by the fact that the synthesizers deliver an extremely precise frequency which makes it possible to avoid interference with neighboring emissions.

De plus, les synthétiseurs du dispositif selon l'invention peuvent être réglés par pas sur une large gamme de fréquences. Selon une réalisation préférentielle du dispositif, les synthétiseurs pourront être réglés par pas de 10 KHz entre 100 et 110 MHz. Le choix étendu de fréquences porteuses ainsi autorisé permet de choisir une fréquence libre en cas de perturbation par d'autres émissions sur la fréquence préalablement choisie, comme notamment les émissions de télécommande de modèles réduits. Ce règlage peut être effectué par l'utilisateur de la chaîne haute fidélité, grâce à un bouton placé sur l'unité d'émission 1 et sur chacune des enceintes 2 réceptrices.In addition, the synthesizers of the device according to the invention can be adjusted in steps over a wide range of frequencies. According to a preferred embodiment of the device, the synthesizers can be adjusted in 10 KHz steps between 100 and 110 MHz. The wide choice of carrier frequencies thus authorized makes it possible to choose a free frequency in the event of disturbance by other emissions on the frequency previously chosen, such as in particular the remote control emissions of reduced models. This adjustment can be carried out by the user of the high-fidelity system, using a button placed on the transmitting unit 1 and on each of the 2 receiving speakers.

Selon l'invention, un second bouton placé également sur chaque enceinte 2 permet d'actionner le commutateur 14 pour choisir la voie que devra restituer chaque enceinte.According to the invention, a second button also placed on each enclosure 2 makes it possible to actuate the switch 14 to choose the channel which each enclosure will have to restore.

Les avantages du dispositif selon l'invention sont multiples :

  • -l'absence de fils reliant les appareils de lecture aux enceintes permet de disposer celles-ci sans contraintes au gré de l'utilisateur. Elle permet également de disposer autant de paires d'enceintes que l'on veut dans plusieurs pièces et avec une puissance suffisante de l'amplificateur haute fréquence, à des distances importantes (par exemple jusqu'à 800 m pour 3W).
  • - L'image stéréophonique approche de la perfection par le fait que chaque enceinte restitue son propre canal. La diaphonie est supprimée.
  • - La possibilité de changer les fréquences porteuses permet d'éviter les interférences à un moment donné.
  • - La possibilité d'attribuer à une enceinte l'une ou l'autre des voies, permet de disposer celles-ci sans se préocuper de la voie qu'elles devront transmettre, la sélection pouvant être effectuée après l'installation.
The advantages of the device according to the invention are multiple:
  • -the absence of wires connecting the reading devices to the speakers allows them to be placed without constraints at the discretion of the user. It also allows you to have as many pairs of speakers as you want in several rooms and with sufficient power from the high frequency amplifier, at large distances (for example up to 800 m for 3W).
  • - The stereophonic image approaches perfection by the fact that each speaker reproduces its own channel. Crosstalk is removed.
  • - The possibility of changing the carrier frequencies makes it possible to avoid interference at a given time.
  • - The possibility of assigning one or other of the channels to an enclosure, makes it possible to arrange these without worrying about the channel that they will have to transmit, the selection being able to be made after installation.

Claims (6)

1. Procédé de transmission, à partir d'une installation de reproduction du son, de signaux sonores, à des enceintes acoustiques destinées à l'audition stéréophonique, caractérisé en ce que la transmission s'effectue sans fils au moyen d'une émission stéréophonique en modulation de fréquence dont la fréquence pilote est fournie par les deux signaux basse fréquence "droite" et "gauche", issus de l'appareil de reproduction du son, et la fréquence porteuse par un synthétiseur de fréquence, l'émission étant captée par les antennes d'au moins deux enceintes pour être, dans chaque enceinte, démodulée et décodée, un seul des deux signaux basse fréquence décodé dans une enceinte étant amplifié puis délivré aux haut-parleurs de l'enceinte concernée, à savoir le signal "gauche" pour une enceinte et signal "droite" pour l'autre de façon à procurer une audition stéréophonique.1. A method of transmission, from a sound reproduction installation, of sound signals, to acoustic speakers intended for stereophonic hearing, characterized in that the transmission is carried out without wires by means of a stereophonic emission in frequency modulation, the pilot frequency of which is supplied by the two low-frequency signals "right" and "left", originating from the sound reproduction apparatus, and the carrier frequency by a frequency synthesizer, the emission being picked up by the antennas of at least two speakers to be demodulated and decoded in each enclosure, only one of the two low frequency signals decoded in one enclosure being amplified and then delivered to the speakers of the enclosure concerned, namely the "left" signal "for one speaker and" right "signal for the other to provide stereophonic hearing. 2. Procédé selon la revendication 1, caractérisé en ce que la démodulation dans chaque enceinte est commandée par un synthétiseur de fréquence.2. Method according to claim 1, characterized in that the demodulation in each enclosure is controlled by a frequency synthesizer. 3. Procédé selon l'ensemble des revendications 1 et 2, caractérisé en ce que l'on règle les synthétiseurs de l'unité d'émission et des enceintes sur la même fréquence.3. Method according to all of claims 1 and 2, characterized in that one adjusts the synthesizers of the emission unit and the speakers on the same frequency. 4. Dispositif destiné à la restitution en stéréophonique de signaux sonores, obtenus à partir d'une installation de reproduction du son, par des enceintes acoustiques, caractérisé en ce qu'il comprend une unité d'émission (1) comportant un préamplificateur basse fréquence à deux voies (3), destiné à recevoir deux signaux basse fréquence d'un appareil de lecture du son ou d'un récepteur radio, un multiplexeur (4) pour coder les signaux basse fréquence préamplifiés de manière à obtenir une fréquence pilote, un synthétiseur de fréquence (5) pouvant produire des signaux à haute fréquence déterminés, un modulateur (6) pour moduler le signal HF issu du synthétiseur (5) avec la fréquence pilote provenant du multiplexeur (4), un amplificateur haute fréquence (7) destiné à amplifier le signal modulé et une antenne d'émission (8), et en ce qu'il comprend au moins deux enceintes acoustiques (2) constituées chacune en unité de réception et comportant une antenne de réception (9), un amplificateur haute fréquence (10), un synthétiseur de fréquence (11), réglé sur la même fréquence que le synthétiseur (5) de l'unité d'émission (1), qui commande un démodulateur (12) pour démoduler ledit signal, un décodeur stéréophonique.(13) restituant les basses fréquence initiales, un commutateur (14) permettant de sélectionner selon l'enceinte le signal correspondant à la voie destinée à être reproduite, un amplificateur basse fréquence (15) amplifiant ledit signal et au moins un haut-parleur (16) restituant le signal basse fréquence de la voie sélectionnée.4. Device intended for the stereophonic reproduction of sound signals, obtained from a sound reproduction installation, by acoustic speakers, characterized in that it comprises a transmission unit (1) comprising a low frequency preamplifier with two channels (3), intended to receive two low frequency signals from a sound playback device or a radio receiver, a multiplexer (4) for coding the preamplified low frequency signals so as to obtain a pilot frequency, a frequency synthesizer (5) capable of producing determined high frequency signals, a modulator (6) for modulating the HF signal coming from the synthesizer (5) with the pilot frequency coming from the multiplexer (4), a high frequency amplifier (7) intended to amplify the modulated signal and a transmit antenna (8), and in that it comprises at least two loudspeakers (2) each constituted as a reception unit and comprising a receive antenna (9), a high frequency amplifier (10) , a frequency synthesizer (11), set to the same frequency as the synthesizer (5) of the transmitting unit (1), which controls a demodulator (12) to demodulate said signal, a stereophonic decoder. (13) reproducing the initial low frequencies, a switch (14) making it possible to select, depending on the enclosure, the signal corresponding to the channel intended to be reproduced, a low frequency amplifier (15) amplifying said signal and at least one speaker (16) reproducing the low frequency signal of the selected channel. 5. Dispositif selon la revendication 4, caractérisé en ce que les synthétiseurs (5 et 11) sont prévus pour délivrer sélectivement plusieurs fréquences.5. Device according to claim 4, characterized in that the synthesizers (5 and 11) are provided for selectively delivering several frequencies. 6. Dispositif selon la revendication 5, caractérisé en ce que les synthétiseurs peuvent être réglés de 100 à 110 MHz par pas de 10KHz.6. Device according to claim 5, characterized in that the synthesizers can be adjusted from 100 to 110 MHz in steps of 10KHz.
EP83400718A 1982-04-13 1983-04-11 Method and device for wireless stereophonic transmission from a sound reproducing apparatus to loudspeakers Withdrawn EP0091874A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8206329 1982-04-13
FR8206329A FR2525052A1 (en) 1982-04-13 1982-04-13 METHOD AND DEVICE FOR STEREO PHONE TRANSMISSION FROM A WIRELESS REPRODUCTION SYSTEM TO ACOUSTIC ENCLOSURES

Publications (1)

Publication Number Publication Date
EP0091874A1 true EP0091874A1 (en) 1983-10-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400718A Withdrawn EP0091874A1 (en) 1982-04-13 1983-04-11 Method and device for wireless stereophonic transmission from a sound reproducing apparatus to loudspeakers

Country Status (3)

Country Link
EP (1) EP0091874A1 (en)
JP (1) JPS58187099A (en)
FR (1) FR2525052A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2554657A1 (en) * 1983-11-03 1985-05-10 Burstin Gilbert Adaptor device for wireless audiophone link.
FR2619480A1 (en) * 1987-08-14 1989-02-17 Marinier Denis Method and device for high-quality transmission, from a wireless sound reproduction facility, with stand-alone sound projectors
EP0600043A1 (en) * 1991-08-21 1994-06-08 L.S. Research, Inc. System for short-range transmission of signals over the air using a high frequency carrier
WO1995033357A1 (en) * 1994-05-26 1995-12-07 Mb Quart Akustik Und Elektronik Gmbh Process and equipment for the reproduction of sound signals, and associated control device and sound reproduction device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1203582B (en) * 1986-07-18 1989-02-15 Italiana Per Lo Sviluppo Dell PERFECTED REPRODUCER OF STEREOFONIC SIGNALS
JP2002064900A (en) * 2000-08-18 2002-02-28 Sony Corp Multichannel sound signal reproducing apparatus
JP4368210B2 (en) 2004-01-28 2009-11-18 ソニー株式会社 Transmission / reception system, transmission device, and speaker-equipped device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1591095A1 (en) * 1967-04-03 1970-12-17 Wolfgang Dietz Wireless coupling of stereo headphones
US3590382A (en) * 1967-12-20 1971-06-29 Frank M Kenney Wireless stereo sound speaker system and modulator-oscillator circuit
FR2168999A1 (en) * 1972-01-24 1973-09-07 Ferrero Alexandre
DE2433893A1 (en) * 1974-07-15 1976-02-05 Werner Mertin Stereo sound reproduction system without cables - signals transmitted to loudspeaker boxes by radio
FR2453552A1 (en) * 1979-04-04 1980-10-31 Marinier Denis Mobile radio broadcast relay - uses radio sound to frequency modulate selected oscillator generated VHF carrier
FR2479616A1 (en) * 1980-03-28 1981-10-02 Marinier Denis Short range FM receiver operating from relay - has acoustic chamber with autonomous and movable receiver circuit and loudspeakers served by individual amplifiers

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1591095A1 (en) * 1967-04-03 1970-12-17 Wolfgang Dietz Wireless coupling of stereo headphones
US3590382A (en) * 1967-12-20 1971-06-29 Frank M Kenney Wireless stereo sound speaker system and modulator-oscillator circuit
FR2168999A1 (en) * 1972-01-24 1973-09-07 Ferrero Alexandre
DE2433893A1 (en) * 1974-07-15 1976-02-05 Werner Mertin Stereo sound reproduction system without cables - signals transmitted to loudspeaker boxes by radio
FR2453552A1 (en) * 1979-04-04 1980-10-31 Marinier Denis Mobile radio broadcast relay - uses radio sound to frequency modulate selected oscillator generated VHF carrier
FR2479616A1 (en) * 1980-03-28 1981-10-02 Marinier Denis Short range FM receiver operating from relay - has acoustic chamber with autonomous and movable receiver circuit and loudspeakers served by individual amplifiers

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2554657A1 (en) * 1983-11-03 1985-05-10 Burstin Gilbert Adaptor device for wireless audiophone link.
FR2619480A1 (en) * 1987-08-14 1989-02-17 Marinier Denis Method and device for high-quality transmission, from a wireless sound reproduction facility, with stand-alone sound projectors
EP0600043A1 (en) * 1991-08-21 1994-06-08 L.S. Research, Inc. System for short-range transmission of signals over the air using a high frequency carrier
EP0600043A4 (en) * 1991-08-21 1994-08-03 L.S. Research, Inc.
WO1995033357A1 (en) * 1994-05-26 1995-12-07 Mb Quart Akustik Und Elektronik Gmbh Process and equipment for the reproduction of sound signals, and associated control device and sound reproduction device

Also Published As

Publication number Publication date
JPS58187099A (en) 1983-11-01
FR2525052B1 (en) 1984-07-06
FR2525052A1 (en) 1983-10-14

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