EP0909112A1 - Système sans fil à transmission numérique pour haut-parleurs - Google Patents

Système sans fil à transmission numérique pour haut-parleurs Download PDF

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Publication number
EP0909112A1
EP0909112A1 EP98402266A EP98402266A EP0909112A1 EP 0909112 A1 EP0909112 A1 EP 0909112A1 EP 98402266 A EP98402266 A EP 98402266A EP 98402266 A EP98402266 A EP 98402266A EP 0909112 A1 EP0909112 A1 EP 0909112A1
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EP
European Patent Office
Prior art keywords
digital
signal
circuit
digital transmission
information
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EP98402266A
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German (de)
English (en)
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EP0909112B1 (fr
Inventor
Guy Nathan
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TouchTunes Music Co LLC
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TouchTunes Music Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00Circuits for transducers, loudspeakers or microphones
    • H04R3/12Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00Stereophonic arrangements
    • H04R5/04Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2420/00Details of connection covered by H04R, not provided for in its groups
    • H04R2420/07Applications of wireless loudspeakers or wireless microphones
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00Public address systems

Definitions

  • the present invention relates to a wireless transmission system digital speaker.
  • Wireless speaker systems are known in which a analog audio signal is converted to frequency modulation signal, this frequency modulated signal being transmitted over power lines AC from a home network.
  • the signal received by the network domestic product is then converted back to an audio signal after extracting the modulated frequency signal.
  • Such a device requires, in order to have the two channels stereophonic, to provide a first carrier frequency for the first channel and a second carrier frequency for the second channel. These frequencies will have to be selected according to very precise conditions, this which will also limit the possibilities of bandwidth.
  • a first object of the invention is to propose a wireless system with digital transmission for loudspeakers which allows the diffusion of digital compact disc quality stereo signals and / or the remote control.
  • a second goal is to allow the emission of several signals to different speakers.
  • serialization means include means for inserting into the serialized signal packets a destination address; and in that the reception means comprise means for comparing the address appearing in the received packet with the address specific to the reception device to which the loudspeaker is connected.
  • the serialization device comprises means for multiplexing multiple frames of digital files representative of a different audio signal to different addresses.
  • Another object of the invention is to propose a system which allows to ensure that copyright cannot be defrauded.
  • This third goal is achieved by the fact that the transmission circuits have an encryption circuit and the receiving device connected includes a decryption circuit using a secret key stored in the memory of the deserialization circuit.
  • the information of the digital signal are serialized according to a protocol comprising a first part constitutive of protocol information, a second constitutive part of the recipient's address, a third part constituting the signal digital or multiplexed digital signals, and a fourth part constituting the end of protocol information.
  • the protocol includes a fifth component of the speaker control information.
  • the protocol includes a sixth component of at least one encryption key.
  • the system includes means for include control commands allowing individual adjustment of each loudspeaker, in the serial signal circulating in packets.
  • the system comprises means for converting an analog signal into a digital signal, arranged upstream of the means for compressing the file representative of the audio signal, when the audio signal to be transmitted is of the analog type.
  • reference (13) designates the two conductors of a network domestic supply of electrical energy to a building or premises intended to accommodate a public or a community such as for example a bar, a department store, a sports center, etc ....
  • an emission device (10) comprising the primary winding of a first transformer (108) which delivers by its secondary winding through a diode rectifier circuit a power signal to a power circuit (100) which extracts from the signal of rectified AC power, the signals necessary to the supply of the various circuits of the device.
  • this circuit (101) is supplied with voltage by the circuit (100) and receives from a microcontroller (102) packet streams (P1, P2) of data representing information digital serialized according to a protocol (P) shown below.
  • This protocol comprises a first part (IP) constituting the information protocol, a second part (AD) constituting the address of the recipient or the addresses of each recipient, a possible third part (IC) constituting the speaker control information, a possible fourth part (CE) constituting a key encryption or several keys, each for an address, a fifth part (ANS) constituting the digital audio signal or multiplexed audio signals, each signal being associated with one of the addresses of the recipient and finally, a sixth part (IFP) constituting the information end of protocol.
  • IP first part
  • AD the address of the recipient or the addresses of each recipient
  • IC the address of the recipient
  • CE possible fourth part
  • CE constituting a key encryption or several keys
  • the signals are modulated in phase quadrature by the circuit (101) on a carrier, located between 200 and 300 kHz and are superimposed on the AC signal from the mains via the transformer (109).
  • the digital audio signals from the audio source after compression represent a digital bit rate of 128 kilo bits per second and are processed by the microcontroller (102) to be sent in packets successive according to the protocol (EP) explained above.
  • the microcontroller program (102) can be arranged to multiplexing multiple audio sources allowing for example, to send a piece of classical music to a first speaker while sending a song at the same time jazz music to a second speaker, each with a specific address and its own decryption key.
  • the device (10) addresses one or more frames to a user identified by a card or a box (11) connected to the loudspeaker.
  • the transmitting device (10) and the receiving device (s) (11) are not connected together only through the electrical conductors of the network domestic power supply.
  • the microcontroller operating program (102) will allow upon receipt of orders sent by a box of remote control (12), for example transmitting a wave signal at destination a sensor (1020), to include the commands thus generated by this box (12) in the package, so as to constitute the control information of the loud speaker.
  • This control information allows individual adjustment each speaker by adjusting the right channel, the left channel, the bass, treble, volume, etc .
  • a encryption circuit (103) placed between the compression circuit (104) and the microcontroller (102). If the source of the musical signals is not not of the "Digital" type, a converter is added to the device analog digital (106) receiving at its input the output signals an analog amplifier (107) which receives the audio signals analog.
  • the receiving device (11) is constituted as above by a first transformer (118) allowing using a circuit rectifier, to supply a supply circuit (110) intended to generate the supply signals necessary for the operation of the various circuits of the receiving device (11).
  • a second transformer (119) connected on the primary of the first, using a decoupling capacity, feeds a phase quadrature demodulator (111) which provides on its output serial protocol signals and protocol packets to a microcontroller (112) which transforms these serial signals into parallel signals to a decryption circuit (113), the output of which is connected to a decompression circuit (114).
  • the output of the decompression circuit (114) is itself connected to a digital conversion circuit analog (115), the output of which is intended to supply a loudspeaker (HP).
  • Compression and decompression circuits by an amplifier (116) apply a level 3 "MPEG" algorithm and the encryption (103) and decryption (113) circuit implement a "MMPP" (MultiMedia Protection Protocol) type algorithm.
  • the memory of the microcontroller (112) of the housing (11) is loaded with the identification address which allows you to compare your address, to the address received in the packet to identify whether the digital information audio are intended for it or are intended for another speaker.
  • the memory of the microcontroller is loaded during initialization or at manufacturing with a decryption key. Loading during initialization with the decryption key can be done using the fourth protocol area.
  • Analog to digital converter circuits (CAN / or DAC) encryption compression and amplification of the transmitting device (10) can be realized, for example, by a digital signal processor marketed by MOTOROLA under the reference 563XX and commonly called "D.S.P. (Digital Signal Processor)".
  • the decryption, decompression and digital to analog conversion of the receiving device (11) can be realized in a digital signal processor marketed by MOTOROLA under the reference 563XX and commonly called “D.S.P. (Digital Signal Processor) ".
  • This central unit controls and manages a control circuit for sound (5), a telecommunication control circuit (4), a circuit (3) input control circuit, a memory control circuit (2) earth, a circuit (6) for controlling the display means.
  • the visualization means consist mainly of a video monitor (62) 14 inch (35.56 cm) flat screen without type interlacing SVGA high resolution and low radiation, this monitor is used for image reproduction (for example, album covers music selections), graphics, or video clips.
  • Mass storage means (21) using discs high speed and high capacity "SCSl” hard drives are associated with storage means already present in the microprocessor device. These means are used to store digital audiovisual information and compressed.
  • a high speed telecommunications modem adapter (41) 28.8 kbps is integrated to authorize the link with a distribution network audiovisual information controlled by a central server.
  • the system includes speakers (54) receiving the signal amplifier-tuner (53) connected to an electronic circuit (5) of the type "Music synthesizer” designed to support a large number of input sources while providing output with a quality of "CD” type (compact disc), such as, for example, the audio adapter microprocessor-based multimedia, "Sound Blaster” card type SBP32AWE from Creative Labs Inc on which two memory buffers (56, 57) are added for the purpose explained later.
  • CD compact disc
  • the display means control circuit also includes two buffer memories (66, 67) for the stated purpose later.
  • a thermally regulated 240 watt ventilated power supply provides energy to the system. This power supply is protected against overcurrents and overshoots.
  • the audiovisual reproduction system manages, through its input controller circuit (3), a touch screen (33) "lntelli Touch” of 14 inches (35.56 cm) from Elo Touch Systems Inc., which includes a panel for coating the glass using "advanced surface wave technology” as well as an "AT” type bus controller.
  • This touch screen allows, after have displayed on the video monitor (62) or the screen of a television set (61), various selection information used by customers as well as selection information used by customers, as well as information of orders and management control used by the manager or the system owner. It is also used for maintenance purposes in combination with an external keyboard (34) which can be connected to the system which has a keyboard connector for this, controlled by a key lock (32) through the interface circuit (3).
  • a royalty payment system (35) from National Rejectors Inc. is also connected to the input interface circuit (3). It is also possible to use any other device which allows the reception of any method of payment by coins, tickets, tokens, magnetic cards to chips or combination of means of payment.
  • chassis or frame is also provided. steel with customizable exterior fittings.
  • a wireless microphone (55) is connected to the sound controller (5), which turns it into a powerful system of public announcements and information or possibly in a karaoke machine.
  • a speaker system wireless can be used by the system.
  • Two buffers (56, 57) are associated with the sound controller circuit (5) to allow each to store information in an alternative manner corresponding to a quarter of a second of sound.
  • two buffers (66, 67) are associated with the video controller circuit (6) each capable and alternatively to memorize a tenth of a second of images.
  • a respective buffer (46, 36, 26) is associated with each of the controller circuits communication (4), input interface (3) and storage (2).
  • the digitized and compressed audiovisual data are stored in the storage means (21).
  • This information is transmitted through the unit central (1) to the map (105) on which the elements have been added corresponding to the circuit (10), the encryption circuit (103) being directly connected to the buffer circuits (56, 57) in the event that the information is already compressed, either by a first connector (1021), avoiding the circuit encryption (103), if the information is already encrypted or has not need to be, either by a second connector (1031), using the circuit encryption (103), if the information is to be encrypted.

Abstract

La présente invention concerne un système sans fil à transmission numérique pour haut-parleurs comportant : des moyens de compression du fichier représentatif du signal numérique audio de type "Compact disque", un dispositif d'émission comportant des moyens de transformation de ce signal compressé en signal série circulant par paquets à destination d'un circuit modulateur à quadrature de phases et des moyens de transmettre les signaux sortant du circuit modulateur à quadrature de phases au réseau domestique d'alimentation en électricité ; un dispositif de réception comportant des moyens de branchement sur ce réseau domestique et d'extraire du signal d'alimentation en électricité par un démodulateurs à quadrature de phases les paquets d'informations véhiculant le signal numérique audio pour le transformer en un signal numérique parallélisé envoyé vers un circuit de décompression ; des moyens de transformer les signaux numériques décompressés en un signal analogique destiné à alimenter un haut-parleur après amplification adéquate. <IMAGE>

Description

La présente invention concerne un système sans fil à transmission numérique pour haut-parleurs.
Il est connu des systèmes de haut-parleurs sans fil dans lesquels un signal audio analogique est converti en signal à modulation de fréquence, ce signal à modulation de fréquence étant transmis sur les lignes d'alimentation au courant alternatif d'un réseau domestique. Le signal reçu par le réseau domestique est ensuite reconverti en un signal audio après extraction du signal de fréquence modulée.
Un tel enseignement est notamment divulgué par le brevet U.S. 4 829 570. Ce brevet envisage, en outre, l'utilisation d'un dispositif de compression pour permettre la compression des signaux analogiques délivrés par un lecteur de disque compact, dont la plage dynamique large nécessite une très large bande passante pour permettre la transmission en modulation de fréquence. La large bande et les déviations importantes posent de nombreux problèmes qui sont résolus dans ce document par l'utilisation d'un circuit compresseur pour réduire la plage dynamique totale du signal audio. Ce document nous permet déjà de prendre conscience d'une première difficulté qui est la limitation des systèmes stéréophoniques en particulier utilisant la modulation de fréquence et fonctionnant avec des systèmes analogiques tels que des oscillateurs à fréquence variable.
Lorsqu'on veut passer de la qualité stéréophonique simple à la qualité stéréophonique du type "CD Numérique", la quantité d'informations à transmettre est telle que l'on est très vite limité en modulation de fréquence par la bande passante.
Enfin, ce type de système enseigné par le brevet U.S. 4 829 570 est acceptable pour des utilisations à des fins privées sur le réseau domestique d'une habitation personnelle mais peut être difficilement mis en place dans un immeuble ou encore moins dans des collectivités ou des ensembles commerciaux. En effet, la musique diffusée sur le réseau d'alimentation sera captée au même moment par tous les haut-parleurs installés et connectés au réseau. Ceci pose un problème de règlement des droits d'auteur et il est donc souhaitable de prévoir un dispositif qui permette d'éviter une diffusion généralisée.
Enfin, un tel dispositif nécessite, pour avoir les deux canaux stéréophoniques, de prévoir une première fréquence porteuse pour le premier canal et une seconde fréquence porteuse pour le second canal. Ces fréquences devront être sélectionnées selon des conditions bien précises, ce qui va limiter également les possibilités de la bande passante.
Un premier but de l'invention est de proposer un système sans fil à transmission numérique pour haut-parleurs qui permette la diffusion des signaux stéréophoniques de qualité compact disque numérique et/ou la commande à distance.
Ce premier but est atteint par le fait que le système sans fil à transmission numérique pour haut-parleurs comporte :
  • des moyens de compression du fichier représentatif du signal numérique audio de type "Compact disque", un dispositif d'émission comportant des moyens de transformation de ce signal compressé en signal série circulant par paquets à destination d'un circuit modulateur à quadrature de phases et des moyens de transmettre les signaux sortant du circuit modulateur à quadrature de phases au réseau domestique d'alimentation en électricité ;
  • un dispositif de réception comportant des moyens de branchement sur ce réseau domestique et d'extraire du signal d'alimentation en électricité par un démodulateur à quadrature de phases les paquets d'informations véhiculant le signal numérique audio pour le transformer en un signal numérique parallélisé envoyé vers un circuit de décompression ;
  • des moyens de transformer les signaux numériques décompressés en un signal analogique destiné à alimenter un haut-parleur après amplification adéquate.
Un second but est de permettre l'émission de plusieurs signaux musicaux à destination de différents haut-parleurs.
Ce but est atteint par le fait que les moyens de sérialisation comportent des moyens d'insérer dans les paquets de signaux sérialisés une adresse de destination ;
   et en ce que les moyens de réception comportent des moyens de comparer l'adresse figurant dans le paquet reçu avec l'adresse spécifique au dispositif de réception auquel le haut-parleur est relié.
Selon une autre particularité, le dispositif de sérialisation comporte des moyens de multiplexer plusieurs trames de fichiers numériques représentatifs d'un signal audio différent à destination d'adresses différentes.
Un autre but de l'invention est de proposer un système qui permette de s'assurer que les droits d'auteur ne peuvent pas être fraudés.
Ce troisième but est atteint par le fait que les circuits d'émission comportent un circuit d'encryptage et le dispositif de réception connecté comporte un circuit de décryptage utilisant une clé secrète mémorisée dans la mémoire du circuit de désérialisation.
Selon une autre particularité, les informations du signal numérique sont sérialisées selon un protocole comportant une première partie constitutive des informations de protocole, une deuxième partie constitutive de l'adresse du destinataire, une troisième partie constituant le signal numérique ou les signaux numériques multiplexés, et une quatrième partie constitutive de l'information de fin de protocole.
Selon une autre particularité, le protocole comporte une cinquième partie constitutive des information de contrôle des haut-parleurs.
Selon une autre particularité, le protocole comporte une sixième partie constitutive d'au moins une clé d'encryptage.
Selon une autre particularité, le système comprend des moyens pour inclure des commande de contrôle permettant le réglage individuel de chaque haut-parleurs, dans le signal série circulant par paquet.
Selon une autre particularité, le système
   comprend des moyens de conversion d'un signal analogique en signal numérique, disposé en amont des moyens de compression du fichier représentatif du signal audio, lorsque le signal audio à transmettre est de type analogique.
D'autres caractéristiques et avantages de la présente invention apparaítront plus clairement à la lecture de la description ci-après faite en référence aux dessins annexés dans lesquels :
  • la figure 1 représente une vue schématique du circuit électronique permettant la mise en oeuvre de l'invention ;
  • la figure 2 représente une vue schématique d'un système audiovisuel de type "Juke-box" dans lequel le dispositif de l'invention peut être utilisé.
L'invention va maintenant être décrite en liaison avec la figure 1 sur laquelle la référence (13) désigne les deux conducteurs d'un réseau domestique d'alimentation en énergie électrique d'un immeuble ou d'un local destiné à accueillir un public ou une collectivité tel que par exemple un bar, un grand magasin, une enceinte sportive, etc... . Sur ce réseau d'alimentation électrique est branché un dispositif d'émission (10) comportant l'enroulement primaire d'un premier transformateur (108) lequel délivre par son enroulement secondaire à travers un circuit de redressement à diodes un signal d'alimentation à un circuit (100) d'alimentation qui extrait, du signal de courant alternatif du secteur redressé, les signaux nécessaires à l'alimentation des différents circuits du dispositif. En parallèle, sur le primaire de ce premier transformateur (108) est branché un second transformateur (109) dont l'enroulement secondaire est alimenté à travers un transistor par un circuit (101) de modulation à quadrature de phases. Ce circuit (101) est alimenté en tension par le circuit (100) et reçoit d'un microcontrôleur (102) des flots de paquets (P1, P2) de données représentant des informations numériques sérialisées selon un protocole (P) représenté en dessous. Ce protocole (P) comporte une première partie (IP) constitutive des informations de protocole, une deuxième partie (AD) constitutive de l'adresse du destinataire ou des adresses de chacun des destinataires, une éventuelle troisième partie (IC) constitutive des informations de contrôle des haut-parleurs, une éventuelle quatrième partie (CE) constitutive d'une clé d'encryptage ou de plusieurs clés, chacune pour une adresse, une cinquième partie (SNA) constitutive du signal numérique audio ou des signaux audio multiplexés, chaque signal étant associé à une des adresses du destinataire et enfin, une sixième partie (IFP) constitutive de l'information de fin de protocole.
Les signaux sont modulés en quadrature de phases par le circuit (101) sur une porteuse,située entre 200 et 300 kHz et sont superposés au signal alternatif du secteur par l'intermédiaire du transformateur (109). Les signaux numériques audio provenant de la source audio, après compression, représentent un débit numérique de 128 kilo bits par seconde et sont traités par le microcontrôleur (102) pour être envoyés par paquets successifs selon le protocole (EP) explicité ci-dessus.
Le programme du microcontrôleur (102) peut être agencé pour effectuer le multiplexage de plusieurs sources audio permettant par exemple, d'envoyer un morceau de musique classique à destination d'un premier haut-parleur pendant qu'on envoie au même moment un morceau de musique de jazz à destination d'un deuxième haut-parleur, chacun ayant une adresse spécifique et sa propre clé de décryptage.
Dans ce cas, le dispositif (10) adresse une ou plusieurs trames à un utilisateur identifié par une carte ou un boítier (11 ) connecté au haut-parleur. Le dispositif d'émission (10) et le ou les dispositifs de réception (11) ne sont reliés entre eux qu'à travers les conducteurs électriques du réseau domestique d'alimentation électrique.
Enfin, le programme de fonctionnement du microcontrôleur (102) permettra lors de la réception de commandes envoyées par un boítier de télécommande (12), émettant par exemple un signal d'ondes à destination d'un capteur (1020), d'inclure les commandes ainsi générées par ce boítier (12) dans le paquet, de façon à constituer les informations de contrôle du haut-parleur. Ces informations de contrôle permettent le réglage individuel de chaque haut-parleur en réglant le canal droit, le canal gauche, les basses, les aigus, le volume, etc.... .
Lorsque l'on souhaite protéger les informations audio véhiculées sur le réseau domestique, de façon à permettre la collecte des droits d'auteur et éviter que le même morceau musical puisse être écouté par des gens n'ayant pas acquitté les droits d'auteur, on ajoutera dans le dispositif un circuit d'encryptage (103) placé entre le circuit de compression (104) et le microcontrôleur (102). Dans le cas où la source des signaux musicaux n'est pas du type "Numérique", on adjoint au dispositif un convertisseur analogique numérique (106) recevant sur son entrée les signaux de sortie d'un amplificateur analogique (107), lequel reçoit les signaux audio analogiques.
Le dispositif de réception (11) est constitué comme précédemment par un premier transformateur (118) permettant à l'aide d'un circuit redresseur, d'alimenter un circuit (110) d'alimentation destiné à générer les signaux d'alimentation nécessaires au fonctionnement des différents circuits du dispositif de réception (11). Un deuxième transformateur (119) branché sur le primaire du premier, à l'aide d'une capacité de découplage, alimente un démodulateur (111) à quadrature de phases, lequel fournit sur sa sortie série les signaux de protocole et les paquets de protocole à un microcontrôleur (112) qui transforme ces signaux série en signaux parallèles à destination d'un circuit de décryptage (113), dont la sortie est branchée à un circuit de décompression (114). La sortie du circuit de décompression (114) est elle-même branchée à un circuit de conversion numérique analogique (115), dont la sortie est destinée à alimenter un haut-parleur (HP). Les circuits de compression et de décompression par un amplificateur (116) mettent en application un algorithme de type "MPEG" de niveau 3 et le circuit d'encryptage (103) et de décryptage (113) mettent en application un algorithme de type "MMPP" (MultiMédia Protection Protocole).
La mémoire du microcontrôleur (112) du boítier (11) est chargée avec l'adresse d'identification qui permet de comparer son adresse, à l'adresse reçue dans le paquet pour identifier si les informations numériques audio lui sont destinées ou sont destinées à un autre haut-parleur. De même, la mémoire du microcontrôleur est chargée lors de l'initialisation ou à la fabrication avec une clé de décryptage. Le chargement lors de l'initialisation avec la clé de décryptage peut se faire grâce à la quatrième zone du protocole.
Les circuits convertisseurs analogiques numériques (CAN/ou CNA) de compression d'encryptage et d'amplification du dispositif émetteur (10) peuvent être réalisés, par exemple, par un processeur digital de signal commercialisé par MOTOROLA sous la référence 563XX et communément appelé "D.S.P. (Digital Signal Processor)".
De même, les circuits de décryptage, de décompression et de conversion numérique analogique du dispositif récepteur (11) peuvent être réalisés dans un processeur digital de signal commercialisé par MOTOROLA sous la référence 563XX et communément appelé "D.S.P. (Digital Signal Processor)".
On peut ainsi, grâce à un tel dispositif, permettre l'implantation de haut-parleurs multiples dans des locaux différents sous réserve qu'ils soient alimentés par la même phase du réseau auquel le dispositif de transmission (10) sera relié. Ce dispositif de transmission (10) devra d'une part être connecté à une source de signaux audio qui pourra être par exemple la sortie numérique d'un lecteur de disque compact ou bien la sortie numérique d'un disque dur d'un juke-box tel que celui décrit dans la figure 2 et correspondant à la demande de brevet PCT FR 95 01333 publiée sous le numéro WO 96/ 12 256 et d'autre part aux conducteurs du réseau d'alimentation électrique de l'immeuble ou du local. Le juke-box de la figure 2 est constitué par une unité centrale (1), un microprocesseur qui est un système compatible au PC de haute performance. Le choix lors de la mise en oeuvre s'est porté sur un système du type "lntel 80486 DX/2" qui possède des moyens de mémorisation et les caractéristiques suivantes :
  • compatibilité avec le bus local Vesa,
  • antémémoire du processeur : 256 kO,
  • ports série et parallèle de haute performance,
  • adaptateur graphique type SVGA à microprocesseur,
  • contrôleur de bus type SCSl/2,
  • mémoire vive RAM statique auto-alimentéé.
Toute autre unité centrale possédant des performances équivalentes ou supérieures pourra être utilisée dans l'invention.
Cette unité centrale commande et gère un circuit de commande de son (5), un circuit (4) de commande des télécommunications, un circuit (3) de commande des entrées, un circuit (2) de commande de la mémorisation de masse, un circuit (6) de commande des moyens de visualisation. Les moyens de visualisation se composent principalement d'un moniteur vidéo (62) à écran plat de 14 pouces (35,56 cm) sans entrelacement de type SVGA à haute résolution et faible rayonnement, c'est ce moniteur qui est utilisé pour la reproduction d'images (par exemple, les couvertures d'albums des sélections musicales), de graphiques ou de clips vidéo.
Des moyens de mémorisation de masse (21) utilisant des disques durs de type "SCSl" haute vitesse et haute capacité, sont associés aux moyens de mémorisation déjà présents dans le dispositif à microprocesseur. Ces moyens servent au stockage d'informations audiovisuelles numérisées et compressées.
Un adaptateur de modem de télécommunications (41) haute vitesse 28,8 kbps est intégré pour autoriser la liaison avec un réseau de distribution d'informations audiovisuelles contrôlé par un serveur central.
Pour la reproduction des informations sonores des sélections musicales, le système comporte des haut-parleurs (54) recevant le signal d'amplificateur-tuner (53) relié à un circuit électronique (5) de type "Synthétiseur de musique" prévu pour supporter un grand nombre de sources d'entrée tout en fournissant une sortie présentant une qualité de type "CD" (disque compact), telle que par exemple, l'adaptateur audio multimédia à microprocesseur, du type "carte "Sound Blaster"" SBP32AWE de chez Creative Labs Inc sur lequel deux tampons mémoire (56, 57) sont ajoutés dans le but explicité ultérieurement.
De même, le circuit de commande des moyens de visualisation comporte également deux mémoires tampon (66, 67) dans le but explicité ultérieurement.
Une alimentation thermiquement régulée de 240 watts ventilée fournit l'énergie au système. Cette alimentation est protégée contre les surintensités et les suroscillations.
Le système de reproduction audiovisuelle gère, par le biais de son circuit contrôleur d'entrée (3), un écran tactile (33) "lntelli Touch" de 14 pouces (35,56 cm) de chez Elo Touch Systems Inc., qui inclut un panneau de revêtement de la vitre utilisant la "technologie avancée d'onde de surface" ainsi qu'un contrôleur de bus de type "AT". Cet écran tactile permet ,après avoir affiché sur le moniteur vidéo (62) ou l'écran d'un téléviseur (61), diverses informations de sélection utilisées par les clients ainsi que des informations de sélection utilisées par les clients, ainsi que des informations de commandes et de contrôle de gestion utilisées par le gérant ou le propriétaire du système. Il est également utilisé à des fins de maintenance en combinaison avec un clavier externe (34) qui peut être relié au système qui possède pour cela un connecteur de clavier, contrôlé par un verrou à clé (32) à travers le circuit d'interface (3).
Le circuit d'entrée (3) interface également avec le système télécommande (31) constitué par exemple :
  • d'une télécommande infrarouge de chez Mind Path Technologies Inc., émetteur qui possède 15 touches de commande pour le système à microprocesseur et 8 touches de commande pour dispositif de projection,
  • d'un récepteur infrarouge avec adaptateur série de chez Mind Path Technologies Inc.
Un dispositif de paiement de redevances (35) de chez National Rejectors Inc. est également relié au circuit d'interface d'entrée (3). Il est également possible d'utiliser tout autre dispositif qui permette la réception de tout mode de paiement par pièces, billets, jetons, cartes magnétiques à puces ou combinaison des moyens de paiement.
Pour loger le système, il est de plus prévu un châssis ou bâti en acier avec garnitures extérieures personnalisables.
Outre ces éléments, un microphone (55) sans fil est relié au contrôleur de son (5), ce qui permet de transformer ce dernier en un puissant système d'annonces et d'informations destinées au public ou éventuellement en machine de karaoké. De même, un système de haut-parleurs sans fil peut être utilisé par le système.
L'ensemble (31) de commande à distance permet au gérant, par exemple de derrière le bar, d'accéder et de contrôler différentes commandes telles que :
  • la commande marche-arrêt du microphone,
  • la commande de mise en sourdine des haut-parleurs,
  • la commande de contrôle de volume sonore,
  • la commande d'annulation de la sélection musicale en train d'être écoutée.
Deux tampons (56, 57) sont associés au circuit contrôleur de son (5) pour permettre de mémoriser chacun de façon alternative une information correspondant à un quart de seconde de son. De même, deux tampons (66, 67) sont associés au circuit contrôleur de vidéo (6) capables chacun et alternativement de mémoriser un dixième de seconde d'images. Enfin, un tampon respectif (46, 36, 26) est associé à chacun des circuits de contrôleur de communication (4), d'interface d'entrée (3) et de mémorisation (2).
Les données audiovisuelles numérisées et compressées sont stockées dans les moyens de mémorisation (21).
Ces informations sont transmises par l'intermédiaire de l'unité centrale (1) à la carte (105) sur laquelle on a rajouté les éléments correspondant au circuit (10), le circuit d'encryptage (103) étant directement connecté aux circuits tampon (56, 57) dans le cas où les informations sont déjà compressées, soit par un premier connecteur (1021), évitant le circuit d'encryptage (103), si les informations sont déjà encryptées ou n'ont pas besoin de l'être, soit par un deuxième connecteur (1031), utilisant le circuit d'encryptage (103), si les informations doivent être encryptées. Dans le cas où les informations ne sont pas compressées, on connectera les tampons (56, 57) à un troisième connecteur (1041) de façon à utiliser le circuit de compression.
Ainsi, en branchant la sortie du transformateur (108) sur le secteur, on pourra en connectant les circuits de réception (11) en différents endroits sur le secteur, alimenter différents haut-parleurs à distance, en plus des haut-parleurs normalement prévus dans le système juke-box (54). Ceci permettra une diffusion sonore de bonne qualité dans différents locaux tout en assurant au gestionnaire la possibilité de régler les volumes selon les locaux ou selon les dispositions des haut-parleurs.
Dans le cas où l'invention est utilisée sur un autre dispositif tel que lecteur de compact disque, radio pour la réception de chaínes spécialisées, etc.... , il est possible d'équiper le dispositif de paiement à l'aide de l'un des moyens de paiement évoqué plus haut pour l'application juke-box qui comme pour le juke-box ne permettra le fonctionnement du dispositif de réception qu'une fois la redevance acquittée et pour la durée prévue pour la redevance. Cette durée est déterminée par une horloge associée au dispositif de réception.
D'autres modifications à la portée de l'homme de métier font également partie de l'esprit de l'invention.

Claims (9)

  1. Système sans fil à transmission numérique pour haut-parleurs comportant :
    des moyens de compression du fichier représentatif du signal numérique audio de type "Compact disque", un dispositif d'émission comportant des moyens de transformation de ce signal compressé en signal série circulant par paquets à destination d'un circuit modulateur à quadrature de phases et des moyens de transmettre les signaux sortant du circuit modulateur à quadrature de phases au réseau domestique d'alimentation en électricité ;
    un dispositif de réception comportant des moyens de branchement sur ce réseau domestique et d'extraire du signal d'alimentation en électricité par un démodulateur à quadrature de phases les paquets d'informations véhiculant le signal numérique audio pour le transformer en un signal numérique parallélisé envoyé vers un circuit de décompression ;
    des moyens de transformer les signaux numériques décompressés en un signal analogique destiné à alimenter un haut-parleur après amplification adéquate.
  2. Système sans fil à transmission numérique pour haut-parleurs selon la revendication 1, caractérisé en ce que les moyens de sérialisation comportent des moyens d'insérer dans les paquets de signaux sérialisés une adresse de destination ;
       et en ce que les moyens de réception comportent des moyens de comparer l'adresse figurant dans le paquet reçu avec l'adresse spécifique au dispositif de réception auquel le haut-parleur est relié.
  3. Système sans fil à transmission numérique pour haut-parleurs selon la revendication 1 ou 2, caractérisé en ce que le dispositif de sérialisation comporte des moyens de multiplexer plusieurs trames de fichiers numériques représentatifs d'un signal audio différent à destination d'adresses différentes.
  4. Système sans fil à transmission numérique pour haut-parleurs selon la revendication 1, caractérisé en ce que les circuits d'émission comportent un circuit d'encryptage et le dispositif de réception connecté comporte un circuit de décryptage utilisant une clé secrète mémorisée dans la mémoire du circuit de désérialisation.
  5. Système de transmission numérique pour haut-parleurs selon la revendication 1 à 4 caractérisé en ce que les informations du signal numérique sont sérialisées selon un protocole comportant une première partie (IP) constitutive des informations de protocole, une deuxième partie (AD) constitutive de l'adresse du destinataire, une troisième partie (SNA) constituant le signal numérique ou les signaux numériques multiplexés, et une quatrième partie (IFP) constitutive de l'information de fin de protocole.
  6. Système de transmission numérique pour haut-parleurs selon la revendication 5 caractérisé en ce que le protocole comporte une cinquième partie (IC) constitutive des information de contrôle des haut-parleurs.
  7. Système de transmission numérique pour haut-parleurs selon la revendication 5 caractérisé en ce que le protocole comporte une sixième partie (CE) constitutive d'au moins une clé d'encryptage.
  8. Système de transmission numérique pour haut-parleurs selon la revendication 1 à 7 caractérisé en ce qu'il comprend des moyens pour inclure des commande de contrôle permettant le réglage individuel de chaque haut-parleurs, dans le signal série circulant par paquet.
  9. Système de transmission numérique pour haut-parleurs selon la revendication 1 à 7 caractérisé en ce qu'il comprend des moyens de conversion d'un signal analogique en signal numérique, disposé en amont des moyens de compression du fichier représentatif du signal audio, lorsque le signal audio à transmettre est de type analogique.
EP98402266A 1997-09-26 1998-09-15 Système sans fil à transmission numérique pour haut-parleurs Expired - Lifetime EP0909112B1 (fr)

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FR9712007A FR2769165B1 (fr) 1997-09-26 1997-09-26 Systeme sans fil a transmission numerique pour haut-parleurs

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FR2769165A1 (fr) 1999-04-02
JPH11163813A (ja) 1999-06-18
CA2249071A1 (fr) 1999-03-26
ES2213885T3 (es) 2004-09-01
US20130094662A1 (en) 2013-04-18
DE69820947T2 (de) 2004-12-23
US9313574B2 (en) 2016-04-12
JP2008072752A (ja) 2008-03-27
ATE257636T1 (de) 2004-01-15
US7206417B2 (en) 2007-04-17
EP0909112B1 (fr) 2004-01-07
CA2249071C (fr) 2008-06-10
US20050111671A1 (en) 2005-05-26
DE69820947D1 (de) 2004-02-12
FR2769165B1 (fr) 2002-11-29
US20070160224A1 (en) 2007-07-12
US8428273B2 (en) 2013-04-23

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