EP0172095A1 - Method and arrangement for transmitting coded information by radio channel in superposition on a traditional frequency modulation transmission - Google Patents

Method and arrangement for transmitting coded information by radio channel in superposition on a traditional frequency modulation transmission Download PDF

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Publication number
EP0172095A1
EP0172095A1 EP85401547A EP85401547A EP0172095A1 EP 0172095 A1 EP0172095 A1 EP 0172095A1 EP 85401547 A EP85401547 A EP 85401547A EP 85401547 A EP85401547 A EP 85401547A EP 0172095 A1 EP0172095 A1 EP 0172095A1
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EP
European Patent Office
Prior art keywords
signals
coded
frequency
transmitted
coded information
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EP85401547A
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German (de)
French (fr)
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EP0172095B1 (en
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Dimitri Baranoff-Rossine
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Individual
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Priority to AT85401547T priority Critical patent/ATE64048T1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
    • H04H20/34—Arrangements for simultaneous broadcast of plural pieces of information by plural channels using an out-of-band subcarrier signal

Definitions

  • the subject of the present invention is a method and a device for transmitting coded information over the air over a traditional frequency modulation transmission.
  • the invention relates more particularly to a method of transmitting coded information over the air in superposition to a traditional transmission in frequency modulation, according to which one modulates in a predetermined frequency range coded information to be transmitted to create modulated coded signals, the modulated coded signals are mixed with the low frequency signals of a traditional program to be broadcast in frequency modulation, the signals delivered by a frequency modulation receiver are filtered to isolate said modulated coded signals, the modulated coded signals are demodulated filtered, and the transmitted encoded information is displayed or recorded, by application of the filtered and demodulated encoded signals to a display or recording unit.
  • the present invention aims precisely to remedy the aforementioned drawbacks and to allow, without altering the quality of a conventional radio broadcast in frequency modulation, to transmit securely, additional coded information capable of supplementing the conventional radio broadcast.
  • a method of the type defined at the head of the description characterized in that the coded information to be transmitted is modulated by displacement of frequencies in a range of frequencies between approximately 15 and 18 kHz, in that the coded signals modulated by displacement of frequencies are mixed with an attenuation from 2D to 40dB compared to the maximum level of transmission with said low frequency signals of a traditional program, and in that the ratio between the frequency excursion of the coded signals modulated by displacement of frequency expressed in herz and the transmission speed of the coded information to be transmitted, expressed in bauds, is kept between approximately 85 and 120% and preferably close to 100%.
  • the signals modulated by displacement of frequencies are applied downstream of the stereophonic filters of the transmitter in frequency modulation in order to mix these modulated signals and the signals of a traditional broadcast program.
  • the reception signals to be filtered are taken upstream of the de-emphasis circuits of the standard frequency modulation receiver.
  • the filtered and demodulated reception signals can be displayed on a computer terminal with the help of which the control of the filtering characteristics can be controlled.
  • a radio transmission device of coded information superimposed on a traditional frequency modulation transmission comprises, in accordance with the invention, an input unit for generating coded information to be transmitted, an FSK coder-modulator for modulating by coded frequency the coded information to be transmitted , in a frequency range between about 15 to 18 kHz, a mixer circuit for superimposing with a 2D attenuation at 40 dB the signals modulated by frequency displacement on a low frequency signal of a traditional program to be applied to a transmitter frequency broadcasting, a decoder comprising filtering circuits and an FSK demodulator for separating the coded information from the signals delivered by a receiver in standard frequency modulation, and a display or recording unit for displaying or recording of coded transmitted, filtered and demodulated information.
  • the display unit can be a standard television receiver or the display unit of a computer terminal provided with a peri-computer socket and if necessary an adaptation circuit.
  • a link may be provided between said computer terminal ensuring the display of the coded information transmitted and the programmable filters of the decoder for the sending of programmable control codes.
  • the decoder further comprises a level adapter arranged at the input and two level control members arranged on either side of the filtering circuits.
  • the device according to the invention lends itself to the transmission of coded information representing for example the title of a disc, an advertising message, or utility information.
  • the coded message which is preferably transmitted repetitively using a looped transmission, may include various control characters or non-displayable coded characters.
  • a conventional transmitter 20 in frequency modulation provided with an antenna 21, and intended to receive by a line 11 low frequency electrical signals representing a radio program to be broadcast and coming from a microphone or a unit for reading recorded information such as a turntable 10 or a tape or cassette recorder.
  • the radio program is simply transmitted in a conventional manner by the FM transmitter 20 and its antenna 21.
  • digital signals coded on the program signals applied by line 11 are superimposed, before frequency modulation transmission, in a mixer 32, so that the FM transmitter then receives via line 33 a mixture of conventional low frequency signals and coded signals.
  • the coded signals can be very easily formed from plain text messages using a conventional computer terminal 40 equipped with a keyboard and capable of delivering on a line 41 signals coded according to a preset code, by example in RTTY code according for example to an R5 232 format.
  • the terminal 40 may include a conventional unit allowing storage and management of texts.
  • the coded signals can also come directly from a memory or other recording medium.
  • the coded signals can be formed from the reading of a bar code using an optical reading device.
  • the coded signals can be constituted by coded signals which cannot be decoded after transmission by radio but which are already present in the recording medium read in the reading device 10 for the radio transmission by the transmitter 20.
  • the signals from the reading device 10 can also be applied by the line 11a to a decoder 12 suitable for decoding encoded discs, cassettes or magnetic tapes.
  • the signals coming from the decoder 12 by the line 4la which include a coded message can then be used to supply the coder 30 intended to receive the coded signals transmitted by the line 41.
  • the encoder 30 essentially comprises a modulator 34 of the FSK type (frequency shift modulation) so as to transmit on line 31 coded signals characterized by two predetermined frequency levels.
  • the FSK modulator 34 is designed in such a way that the frequency levels of the coded signals are situated between approximately 15 kHz and 18 kHz and that the level of the coded signals of line 31 is attenuated by 20 to 40 dB for take into account the level curve of the LF signals usually transmitted by line 11 (see Figure 6). In this way, after mixing in the mixer 32, with the LF signals present on line 11, the coded signals of line 31 do not affect the quality of the conventional radio broadcast and are not removed by the filters either. conventional frequency modulation transmitters or receivers.
  • the introduction of the coded signals can be carried out directly in the FM transmitter 20, by the line 31a in dotted lines on the Figure 1, downstream of the stereophonic filters.
  • the mixer 32 of FIG. 1 is naturally eliminated and the line 33 transmits the same signals as the line 11.
  • the reinjection of coded signals after the stereophonic filters of the FM transmitter makes it possible then to facilitate the separation of the coded signals on reception, thanks to the gain obtained in the frequency band of the FSK modulated coded signals.
  • FIG. 2 schematically shows the elements of the receiving assembly of a device according to the invention.
  • These elements essentially comprise a standard frequency modulation receiver 120 with its antenna 121, a decoder 50 and a display unit 60 which may be a standard television receiver or a computer terminal provided with a peri-computer input.
  • to the decoder 50 can be taken from an audio socket by a line 51 or, preferably, by a line 51a, in dotted lines in FIG. 2, before the de-emphasis circuits of the receiver 120, which makes it possible to have a gain of in the range of 10 to 15 dB in the frequency band containing the coded signals.
  • the coded signals which in the 5D decoder, are separated from the conventional radio message, are applied to the display unit 60 by a line 52 and can then appear in clear on the screen. At the same time, the listener can listen to the usual radio program.
  • the 5D decoder can if necessary be integrated into the housing of the FM receiver 120.
  • the display unit 60 is constituted by a computer terminal, it is also possible to send coded signals from control at the decoder 50 by the line 53 from the terminal 60, in order to adapt to different reception cases and control for example the programming of the quality factor or of the central frequency of the filter contained in the decoder.
  • a recording unit constituted for example by a memory can be substituted or associated with the display unit 60 to record the coded signals coming from the demodulator 50.
  • FIG. 3 shows the constituent elements of the decoder 50.
  • a level adapter 55 receives via an input capacitor 54 the complex signals delivered on the lines 51 or 51a by the FM receiver 120, as previously indicated.
  • the output of the level adapter 55 is connected to filter circuits 56 which are preferably programmable band-pass filters with capacitor switching associated with a clock 57.
  • the programming of the filters can be carried out once and for all, at using keys, but can also be adapted by the user, if the unit 60 is constituted by a computer terminal.
  • Level control elements 63, 64 are respectively disposed before and after the filter circuits 56.
  • An FSK demodulator 58 with phase loop is placed at the output of the filters 56 and of the error correction circuits 59 sensitive to coded signals. error correction can optionally be placed at the output of the FSK demodulator 58.
  • Adapters 61, 62 depending on the type of display unit 60 are interposed between the output of the decoder 50 and line 52a, 52 respectively provided to lead to two display units 60 of different type.
  • FIG. 4 shows a particular example of an FSK modulator which can be incorporated into the encoder 30 of FIG. 1.
  • This modulator 34 is built around a standard basic circuit, for example the XR2206 circuit from the company EXAR - and has characteristics adaptable using external resistors and capacitors.
  • the coded signals are applied to input 35 and the FSK modulated output signals having a sinusoidal shape are available on an output 36. Rectangular output signals are available on an output 37 for control purposes.
  • the FSK modulator 34 can comprise a basic circuit with current switches 131, a frequency-controlled oscillator circuit (VCD) 132 and a multiplier and setting circuit 133 in aususoidale form.
  • VCD frequency-controlled oscillator circuit
  • the external components can then include resistors or potentiometers 141 to 144 and a frequency adjustment capacitor 145, resistors or potentiometers 151 to 153 and a capacitor 154 for adjusting the output signal level, as well as resistors or potentiometers 161, 162 for adjusting the shape and symmetry of the sinusoidal output signal, aiming to obtain minimum distortion.
  • the ratio between the frequency excursion of the signals modulated by frequency shift expressed in herz and the speed of transmission of the coded information to be transmitted , expressed in baud is between approximately 85 and 120% and preferably close to 100%.
  • the frequency offset caused by the FSK modulator is for example + 150Hz.
  • FIG. 5 shows in more detail an exemplary embodiment of a decoder-demodulator circuit 50 with a clock 57 comprising a frequency reference element 70 mounted in parallel on a capacitor 71 and inverting logic gates 73, 74, 75 associated with resistors 77, 79, capacitors 72, 78 and an output circuit 76 constituted by a frequency divider (for example by 9) which makes it possible to deliver clock pulses of the order of 1MHz, for example at a frequency of 8MHz divided by 9.
  • a frequency divider for example by 9
  • the assembly 56 of the filtering circuits comprises first and second filters 56a, 56b with switching of capacitors and which can be constituted for example by the circuits R5620 of the company RETICON.
  • the characteristics of the programmable filters 56a, 56b can be determined by switches, as shown in FIG. 5 or, as indicated previously, by control signals from the terminal 60.
  • the filters 56a, 56b can be of the bandpass type or high pass.
  • the demodulator 58 shown in FIG. 5 has a conventional configuration with an input preamplifier 81, a frequency-controlled circuit (VCD) 80, phase and quadrature detectors 83, a filter 84 for detecting locking, filters loop, and data 85, 86, a latch condition detection comparator 88, an internal reference circuit 89 and a FSK comparator 87 delivering output signals corresponding to the demodulated transmitted coded signals.
  • VCD frequency-controlled circuit
  • FSK comparator 87 delivering output signals corresponding to the demodulated transmitted coded signals.
  • the coded information to be transmitted is transmitted in a repeating loop.
  • the coded message transmitted will advantageously include control characters, including an image erasure code, placed before each message phase, as well as an end of message signaling code.
  • the transmitted coded message comprises non-displayable coded characters and the transmitted non-displayable coded characters are recorded by applying filtered and demodulated signals to a memory unit. This can help, for example, to facilitate the measurement of listening rates of radio stations identified by a specific code.
  • the invention is particularly suitable for the use of the decoder-demodulator in combination with a personal computer terminal such as for example that known under the name ALCATEL 250.
  • the control characters include a character ensuring the configuration of the personal terminal in roll mode.

Abstract

The device comprises an input unit (40) for generating coded information to be transmitted, an FSK coder-modulator (30) for frequency-shift modulation of the coded information to be transmitted, within a frequency range lying between approximately 15 to 18 kHz, a mixer circuit (32) for superimposing, with an attenuation of 20 to 40 dB, the frequency-shift modulated signals on a low-frequency signal of a conventional program which is to be applied to a frequency-modulation radio transmitter (20), a decoder comprising filtering circuits and an FSK demodulator for separating the coded information from the signals delivered by a standard frequency-modulation receiver, and a viewing or recording unit for displaying or recording the filtered and demodulated transmitted coded information. <IMAGE>

Description

La présente invention a pour objet un procédé et un dispositif de transmission d'informations codées par voie hertzienne en superposition à une émission traditionnelle en modulation de fréquence.The subject of the present invention is a method and a device for transmitting coded information over the air over a traditional frequency modulation transmission.

L'invention concerne plus particulièrement un procédé de transmission d'informations codées par voie hertzienne en superposition à une émission traditionnelle en modulation de fréquence, selon lequel on module dans une gamme de fréquences prédéterminée des informations codées à transmettre pour créer des signaux codés modulés, on mélange les signaux codés modulés aux signaux basse fréquence d'un programme traditionnel devant être radio-diffusé en modulation de fréquence, on filtre les signaux délivrés par un récepteur de modulation de fréquence pour isoler lesdits signaux codés modulés, on démodule les signaux codés modulés filtrés, et on affiche ou enregistre les informations codées transmises, par application des signaux codés filtrés et démodulés à une unité de visualisation ou d'enregistrement.The invention relates more particularly to a method of transmitting coded information over the air in superposition to a traditional transmission in frequency modulation, according to which one modulates in a predetermined frequency range coded information to be transmitted to create modulated coded signals, the modulated coded signals are mixed with the low frequency signals of a traditional program to be broadcast in frequency modulation, the signals delivered by a frequency modulation receiver are filtered to isolate said modulated coded signals, the modulated coded signals are demodulated filtered, and the transmitted encoded information is displayed or recorded, by application of the filtered and demodulated encoded signals to a display or recording unit.

On connait déjà divers systèmes de transmission d'informations codées par voie hertzienne. Ces systèmes constituent en général des dispositifs d'alarme, de surveillance ou de recherche de personne et nécessitent l'existence d'émetteurs et récepteurs spécialement conçus pour la transmission d'informations codées.Various systems for transmitting coded information over the air are already known. These systems generally constitute alarm, surveillance or paging devices and require the existence of transmitters and receivers specially designed for the transmission of coded information.

On a par ailleurs déjà tenté de superposer à une émission radio classique certains signaux de commande de fonctions particulières. Toutefois, les applications de ce type sont très spécifiques et ne permettent pas la réception et l'affichage en clair d'informations codées susceptibles de compléter le contenu des informations audio transmises de façon conventionnelle par ondes hertziennes.We have also already attempted to superimpose on a conventional radio transmission certain control signals of particular functions. However, applications of this type are very specific and do not allow the reception and display in clear text of coded information capable of supplementing the content of the audio information transmitted in a conventional manner by radio waves.

On a également proposé de superposer des informations codées à une émission radio classique en modulation de fréquence en ajoutant une sous-porteuse de faible niveau modulée par des signaux codes. Les systèmes proposés n'ont cependant pas permis à ce jour d'obtenir des transmissions fiables n'altérant pas de façon sensible le programme principal ou les signaux codés additionnels.It has also been proposed to superimpose coded information on a conventional radio program in frequency modulation. by adding a low level subcarrier modulated by code signals. The systems proposed have not, to date, made it possible to obtain reliable transmissions which do not appreciably alter the main program or the additional coded signals.

La présente invention vise précisément à remédier aux inconvénients précités et à permettre, sans altérer la qualité d'une émission radiophonique classique en modulation de fréquence, de transmettre de façon sure, des informations codées supplémentaires susceptibles de compléter l'émission radiophonique classique.The present invention aims precisely to remedy the aforementioned drawbacks and to allow, without altering the quality of a conventional radio broadcast in frequency modulation, to transmit securely, additional coded information capable of supplementing the conventional radio broadcast.

Ces buts sont atteints grâce à un procédé du type défini en tête de la description caractérisé en ce que l'on module les informations codées à transmettre par déplacement de fréquences dans une gamme de fréquences situées entre environ 15 et 18kHz, en ce que l'on mélange les signaux codés modulés par déplacement de fréquences avec une atténuation de 2D à 40dB par rapport au niveau maximum de transmission avec lesdits signaux basse fréquence d'un programme traditionnel, et en ce que le rapport entre l'excursion en fréquence des signaux codés modulés par déplacement de fréquence exprimée en herz et la vitesse de transmission des informations codées à transmettre, exprimée en bauds, est maintenu compris entre environ 85 et 120% et de préférence voisin de 100%.These aims are achieved by a method of the type defined at the head of the description, characterized in that the coded information to be transmitted is modulated by displacement of frequencies in a range of frequencies between approximately 15 and 18 kHz, in that the the coded signals modulated by displacement of frequencies are mixed with an attenuation from 2D to 40dB compared to the maximum level of transmission with said low frequency signals of a traditional program, and in that the ratio between the frequency excursion of the coded signals modulated by displacement of frequency expressed in herz and the transmission speed of the coded information to be transmitted, expressed in bauds, is kept between approximately 85 and 120% and preferably close to 100%.

De préférence, on applique les signaux modulés par déplacement de fréquences en aval des filtres stéréophoniques de l'émetteur en modulation de fréquence pour réaliser le mélange desdits signaux modulés et des signaux d'un programme traditionnel à radiodiffusion.Preferably, the signals modulated by displacement of frequencies are applied downstream of the stereophonic filters of the transmitter in frequency modulation in order to mix these modulated signals and the signals of a traditional broadcast program.

Avantageusement, on prélève les signaux de réception à filtrer en amont des circuits de désaccentuation du récepteur de modulation de fréquence standard.Advantageously, the reception signals to be filtered are taken upstream of the de-emphasis circuits of the standard frequency modulation receiver.

Les signaux de réception filtrés et démodulés peuvent être affichés sur un terminal informatique à l'aide duquel on peut commander le contrôle des caractéristiques du filtrage.The filtered and demodulated reception signals can be displayed on a computer terminal with the help of which the control of the filtering characteristics can be controlled.

Un dispositif de transmission par voie hertzienne d'informations codées superposées à une émission traditionnelle en modulation de fréquence comprend, conformément à l'invention, une unité d'entrée pour engendrer des informations codées à transmettre, un codeur-modulateur FSK pour moduler par déplacement de fréquences les informations codées à transmettre, dans une gamme de fréquences située entre environ 15 à 18 kHz, un circuit mélangeur pour superposer avec une atténuation de 2D à 40 dB les signaux modulés par déplacement de fréquence à un signal basse fréquence d'un programme traditionnel devant être appliqué à un émetteur de radiodiffusion en modulation de fréquence, un décodeur comprenant des circuits de filtrage et un démodulateur FSK pour séparer les informations codées des signaux délivrés par un récepteur en modulation de fréquencee standard, et une unité de visualisation ou d'enregistrement pour l'affichage ou l'enregistrement des informations codées transmises filtrées et démodulées.A radio transmission device of coded information superimposed on a traditional frequency modulation transmission comprises, in accordance with the invention, an input unit for generating coded information to be transmitted, an FSK coder-modulator for modulating by coded frequency the coded information to be transmitted , in a frequency range between about 15 to 18 kHz, a mixer circuit for superimposing with a 2D attenuation at 40 dB the signals modulated by frequency displacement on a low frequency signal of a traditional program to be applied to a transmitter frequency broadcasting, a decoder comprising filtering circuits and an FSK demodulator for separating the coded information from the signals delivered by a receiver in standard frequency modulation, and a display or recording unit for displaying or recording of coded transmitted, filtered and demodulated information.

L'unité de visualisation peut être un poste récepteur de télévision standard ou l'unité de visualisation d'un terminal informatique muni d'une prise péri-informatique et le cas échéant d'un circuit d'adaptation. Une liaison peut être prévue entre ledit terminal informatique assurant l'affichage des informations codées transmises et les filtres programmables du décodeur pour l'envoi de codes de contrôle programmables.The display unit can be a standard television receiver or the display unit of a computer terminal provided with a peri-computer socket and if necessary an adaptation circuit. A link may be provided between said computer terminal ensuring the display of the coded information transmitted and the programmable filters of the decoder for the sending of programmable control codes.

Le décodeur comprend en outre un adaptateur de niveau disposé en entrée et deux organes de contrôle de niveau disposés de part et d'autre des circuits de filtrage.The decoder further comprises a level adapter arranged at the input and two level control members arranged on either side of the filtering circuits.

Le dispositif selon l'invention se prête à la transmission d'informations codées représentant par exemple le titre d'un disque, un message publicitaire, ou des informations utilitaires.The device according to the invention lends itself to the transmission of coded information representing for example the title of a disc, an advertising message, or utility information.

Le message codé, qui est transmis de préférence de façon répétitive à l'aide d'une émission bouclée, peut comprendre divers caractères de contrôle ou caractères codés non affichables.The coded message, which is preferably transmitted repetitively using a looped transmission, may include various control characters or non-displayable coded characters.

D'autres caractéristiques et avantages de l'invention ressortiront de la description qui fait suite de modes de réalisation de l'invention en référence au dessin annexé, sur lequel:

  • - la figure 1 représente schématiquement les divers appareils à mettre en oeuvre pour la partie émission d'un dispositif de transmission selon l'invention,
  • - la figure 2 représente schématiquement les divers appareils à mettre en oeuvre pour la partie réception d'un dispositif de transmission selon l'invention,
  • - la figure 3 est le schéma-bloc de la partie réception d'un dispositif conforme à l'invention,
  • - la figure 4 représente un exemple de réalisation de circuit codeur-modulateur pouvant être incorporé dans la partie émission du dispositif selon l'invention,
  • - la figure 5 représente un exemple de circuits de filtrage et de démodulation d'un décodeur pouvant être incorporé dans la partie réception du dispositif selon l'invention, et
  • - la figure 6 représente une courbe du niveau moyen d'enregistrement d'un signal musical en fonction de la fréquence.
Other characteristics and advantages of the invention will emerge from the description which follows of embodiments of the invention with reference to the attached drawing, on which:
  • FIG. 1 schematically represents the various devices to be used for the transmission part of a transmission device according to the invention,
  • FIG. 2 schematically represents the various devices to be used for the reception part of a transmission device according to the invention,
  • FIG. 3 is the block diagram of the reception part of a device according to the invention,
  • FIG. 4 represents an exemplary embodiment of an encoder-modulator circuit which can be incorporated in the transmission part of the device according to the invention,
  • FIG. 5 represents an example of circuits for filtering and demodulating a decoder which can be incorporated in the reception part of the device according to the invention, and
  • - Figure 6 shows a curve of the average level of recording of a musical signal as a function of frequency.

Si l'on se reporte à la figure 1, on voit un émetteur classique 20 en modulation de fréquence, muni d'une antenne 21, et destiné à recevoir par une ligne 11 des signaux électriques basse fréquence représentant un programme radiophonique à radiodiffuser et provenant d'un microphone ou d'un ensemble de lecture d'informations enregistrées tel qu'une platine de tourne-disque 10 ou un magnétophone à bandes ou à cassettes. En l'absence de tout autre dispositif, le programme radiophonique est simplement émis de façon classique par l'émetteur FM 20 et son antenne 21.If we refer to FIG. 1, we see a conventional transmitter 20 in frequency modulation, provided with an antenna 21, and intended to receive by a line 11 low frequency electrical signals representing a radio program to be broadcast and coming from a microphone or a unit for reading recorded information such as a turntable 10 or a tape or cassette recorder. In the absence of any other device, the radio program is simply transmitted in a conventional manner by the FM transmitter 20 and its antenna 21.

Conformément à l'invention, on superpose, avant l'émission en modulation de fréquence, dans un mélangeur 32, des signaux numériques codés aux signaux du programme appliqués par la ligne 11, de sorte que l'émetteur FM reçoit alors par la ligne 33 un mélange de signaux basse fréquence classiques et de signaux codés.According to the invention, digital signals coded on the program signals applied by line 11 are superimposed, before frequency modulation transmission, in a mixer 32, so that the FM transmitter then receives via line 33 a mixture of conventional low frequency signals and coded signals.

Les signaux codés peuvent être formés très facilement à partir de messages en clair à l'aide d'un terminal informatique classique 40 équipé d'un clavier et susceptible de délivrer sur une ligne 41 des signaux codés selon un code préétabli, par exemple en code RTTY selon par exemple un format R5 232. Le terminal 40 peut comporter une unité classique permettant une mise en mémoire et une gestion de textes.The coded signals can be very easily formed from plain text messages using a conventional computer terminal 40 equipped with a keyboard and capable of delivering on a line 41 signals coded according to a preset code, by example in RTTY code according for example to an R5 232 format. The terminal 40 may include a conventional unit allowing storage and management of texts.

Les signaux codés peuvent également provenir directement d'une mémoire ou autre support d'enregistrement. Selon une application possible, les signaux codés peuvent être formés à partir de la lecture d'un code à barres à l'aide d'un dispositif optique de lecture. Selon une autre application, les signaux codés peuvent être constitués par des signaux codés non décodables après transmission par voie hertzienne mais déjà présents dans le support d'enregistrement lu dans le dispositif de lecture 10 pour l'émission radiophonique par l'émetteur 20. Dans ce cas, les signaux issus du dispositif de lecture 10 peuvent également être appliqués par la ligne 11a à un décodeur 12 adapté au décodage de disques, cassettes ou bandes magnétiques codés. Les signaux issus du décodeur 12 par la ligne 4la qui comprennent un message codé peuvent alors servir à alimenter le codeur 30 prévu pour recevoir les signaux codés transmis par le ligne 41.The coded signals can also come directly from a memory or other recording medium. According to a possible application, the coded signals can be formed from the reading of a bar code using an optical reading device. According to another application, the coded signals can be constituted by coded signals which cannot be decoded after transmission by radio but which are already present in the recording medium read in the reading device 10 for the radio transmission by the transmitter 20. In in this case, the signals from the reading device 10 can also be applied by the line 11a to a decoder 12 suitable for decoding encoded discs, cassettes or magnetic tapes. The signals coming from the decoder 12 by the line 4la which include a coded message can then be used to supply the coder 30 intended to receive the coded signals transmitted by the line 41.

Le codeur 30 comprend essentiellement un modulateur 34 du type FSK (modulation par décalage en fréquence) de manière à transmettre sur la ligne 31 des signaux codés caractérisés par deux niveaux de fréquence prédéterminés. Selon l'invention, le modulateur FSK 34 est réalisé de telle manière que les niveaux de fréquence des signaux codés soient situés entre environ 15 kHz et 18 kHz et que le niveau des signaux codés de la ligne 31 soit atténué de 20 à 40 dB pour tenir compte de la courbe de niveau des signaux BF habituellement transmis par la ligne 11 (voir figure 6). De la sorte, après mélange dans le mélangeur 32, avec les signaux BF présents sur la ligne 11, les signaux codés de la ligne 31 n'affectent pas la qualité de l'émission radiophonique classique et ne sont pas non plus supprimés par les filtres des émetteurs ou récepteurs classiques à modulation de fréquence.The encoder 30 essentially comprises a modulator 34 of the FSK type (frequency shift modulation) so as to transmit on line 31 coded signals characterized by two predetermined frequency levels. According to the invention, the FSK modulator 34 is designed in such a way that the frequency levels of the coded signals are situated between approximately 15 kHz and 18 kHz and that the level of the coded signals of line 31 is attenuated by 20 to 40 dB for take into account the level curve of the LF signals usually transmitted by line 11 (see Figure 6). In this way, after mixing in the mixer 32, with the LF signals present on line 11, the coded signals of line 31 do not affect the quality of the conventional radio broadcast and are not removed by the filters either. conventional frequency modulation transmitters or receivers.

On notera que, selon une variante avantageuse, l'introduction des signaux codés peut être effectuée directement dans l'émetteur FM 20, par la ligne 31a en pointillés sur la figure 1, en aval des filtres stéréophoniques. Dans ce cas, le mélangeur 32 de la figure 1 est naturellement supprimé et la ligne 33 transmet les mêmes signaux que la ligne 11. La réinjection de signaux codés après les filtres stéréophoniques de l'émetteur FM permet de faciliter ensuite la séparation des signaux codés à la réception, grâce au gain obtenu dans la bande de fréquences des signaux codés modulés FSK.It will be noted that, according to an advantageous variant, the introduction of the coded signals can be carried out directly in the FM transmitter 20, by the line 31a in dotted lines on the Figure 1, downstream of the stereophonic filters. In this case, the mixer 32 of FIG. 1 is naturally eliminated and the line 33 transmits the same signals as the line 11. The reinjection of coded signals after the stereophonic filters of the FM transmitter makes it possible then to facilitate the separation of the coded signals on reception, thanks to the gain obtained in the frequency band of the FSK modulated coded signals.

La figure 2 montre schématiquement les éléments de l'ensemble de réception d'un dispositif selon l'invention. Ces éléments comprennent essentiellement un récepteur à modulation de fréquence standard 120 avec son antenne 121, un décodeur 50 et une unité de visualisation 60 qui peut être un récepteur de télévision standard ou un terminal informatique muni d'une entrée péri-informatique.Les signaux appliqués au décodeur 50 peuvent être prélevés sur une prise audio par une ligne 51 ou, de préférence, par une ligne 51a, en pointillés sur la figure 2, avant les circuits de désaccentuation du récepteur 120, ce qui permet de disposer d'un gain de l'ordre de 10 à 15 dB dans la bande de fréquences contenant les signaux codés.Figure 2 schematically shows the elements of the receiving assembly of a device according to the invention. These elements essentially comprise a standard frequency modulation receiver 120 with its antenna 121, a decoder 50 and a display unit 60 which may be a standard television receiver or a computer terminal provided with a peri-computer input. to the decoder 50 can be taken from an audio socket by a line 51 or, preferably, by a line 51a, in dotted lines in FIG. 2, before the de-emphasis circuits of the receiver 120, which makes it possible to have a gain of in the range of 10 to 15 dB in the frequency band containing the coded signals.

Les signaux codés, qui dans le décodeur 5D, sont séparés du message radiophonique classique, sont appliqués à l'unité de visualisation 60 par une ligne 52 et peuvent alors apparaître en clair sur l'écran. Dans le même temps, l'auditeur peut écouter le programme radio habituel. Naturellement, le décodeur 5D peut être le cas échéant intégré dans le boîtier du récepteur FM 120. Par ailleurs, dans le cas où l'unité de visualisation 60 est constituée pr un terminal informatique, il est également possible d'envoyer des signaux codés de contrôle au décodeur 50 par la ligne 53 depuis le terminal 60, afin de s'adapter à différents cas de réception et commander par exemple la programmation du facteur de qualité ou de la fréquence centrale du filtre contenu dans le décodeur.The coded signals, which in the 5D decoder, are separated from the conventional radio message, are applied to the display unit 60 by a line 52 and can then appear in clear on the screen. At the same time, the listener can listen to the usual radio program. Naturally, the 5D decoder can if necessary be integrated into the housing of the FM receiver 120. Furthermore, in the case where the display unit 60 is constituted by a computer terminal, it is also possible to send coded signals from control at the decoder 50 by the line 53 from the terminal 60, in order to adapt to different reception cases and control for example the programming of the quality factor or of the central frequency of the filter contained in the decoder.

Une unité d'enregistrement constituée par exemple par une mémoire peut être substituée ou associée à l'unité de visualisation 60 pour enregistrer les signaux codés issus du démodulateur 50.A recording unit constituted for example by a memory can be substituted or associated with the display unit 60 to record the coded signals coming from the demodulator 50.

La figure 3 montre les éléments constitutifs du décodeur 50. Un adaptateur de niveau 55 reçoit par l'intermédiaire d'un condensateur d'entrée 54 les signaux complexes délivrés sur les lignes 51 ou 51a par le récepteur FM 120, comme précédemment indiqué. La sortie de l'adaptateur de niveau 55 est reliée à des circuits de filtrage 56 qui sont de préférence des filtres programmables passe-bande à commutation de condensateurs associés à une horloge 57. La programmation des filtres peut être réalisée une fois pour toutes, à l'aide de clés, mais peut aussi être adaptée par l'utilisateur, si l'unité 60 est constituée par un terminal informatique.FIG. 3 shows the constituent elements of the decoder 50. A level adapter 55 receives via an input capacitor 54 the complex signals delivered on the lines 51 or 51a by the FM receiver 120, as previously indicated. The output of the level adapter 55 is connected to filter circuits 56 which are preferably programmable band-pass filters with capacitor switching associated with a clock 57. The programming of the filters can be carried out once and for all, at using keys, but can also be adapted by the user, if the unit 60 is constituted by a computer terminal.

Des éléments 63,64 de contrôle de niveau sont disposés respectivement avant et après les circuits de filtrage 56. Un démodulateur FSK 58 à boucle de phase est placé en sortie des filtres 56 et des circuits 59 de correction d'erreur sensibles à des signaux codés de correction d'erreurs peuvent le cas échéant être placés en sortie du démodulateur FSK 58. Des adaptateurs 61, 62 fonction du type de l'unité d'affichage 60 sont interposés entre la sortie du décodeur 50 et de ligne 52a, 52 respectivement prévues pour conduire à deux unités d'affichage 60 de type différent.Level control elements 63, 64 are respectively disposed before and after the filter circuits 56. An FSK demodulator 58 with phase loop is placed at the output of the filters 56 and of the error correction circuits 59 sensitive to coded signals. error correction can optionally be placed at the output of the FSK demodulator 58. Adapters 61, 62 depending on the type of display unit 60 are interposed between the output of the decoder 50 and line 52a, 52 respectively provided to lead to two display units 60 of different type.

La figure 4 montre un exemple particulier de modulateur FSK pouvant être incorporé dans le codeur 30 de la figure 1. Ce modulateur 34 est bâti autour d'un circuit de base standard, par exemple le circuit XR2206 de la Société EXAR - et présente des caractéristiques adaptables à l'aide de résistances et condensateurs extérieurs. Les signaux codés sont appliqués sur l'entrée 35 et les signaux de sortie modulés FSK présentant une forme sinusoidale sont disponibles sur une sortie 36. Des signaux de sortie de forme rectangulaire sont disponibles sur une sortie 37 à des fins de contrôle. Comme on peut le voir sur la figure 4, le modulateur FSK 34 peut comprendre un circuit de base avec des interrupteurs de courant 131, un circuit oscillateur (VCD) à fréquence commandée 132 et un circuit 133 multiplieur et de mise sous forme ainusoidale. Les composants extérieurs peuvent alors comprendre des résistances ou potentiomètres 141 à 144 et un condensateur 145 de réglage de fréquence, des résistances ou potentiomètres 151 à 153 et un condensateur 154 de réglage de niveau de signal de sortie, ainsi que des résistances ou potentiomètres 161, 162 d'ajustement de la forme et de la symétrie du signal sinusoïdal de sortie, visant à obtenir une distorsion minimale.FIG. 4 shows a particular example of an FSK modulator which can be incorporated into the encoder 30 of FIG. 1. This modulator 34 is built around a standard basic circuit, for example the XR2206 circuit from the company EXAR - and has characteristics adaptable using external resistors and capacitors. The coded signals are applied to input 35 and the FSK modulated output signals having a sinusoidal shape are available on an output 36. Rectangular output signals are available on an output 37 for control purposes. As can be seen in FIG. 4, the FSK modulator 34 can comprise a basic circuit with current switches 131, a frequency-controlled oscillator circuit (VCD) 132 and a multiplier and setting circuit 133 in aususoidale form. The external components can then include resistors or potentiometers 141 to 144 and a frequency adjustment capacitor 145, resistors or potentiometers 151 to 153 and a capacitor 154 for adjusting the output signal level, as well as resistors or potentiometers 161, 162 for adjusting the shape and symmetry of the sinusoidal output signal, aiming to obtain minimum distortion.

Afin de disposer d'un bon rapport signal/bruit et de réduire l'intermodulation, il est souhaitable que le rapport entre l'excursion en fréquence des signaux modulés par déplacement de fréquence exprimée en herz et la vitesse de transmission des informations codées à transmettre, exprimée en bauds soit comprise entre environ 85 et 120% et de préférence voisine de 100%. Ainsi, avec une vitesse de transmission de 300 Bauds, il est souhaitable que le décalage de fréquence provoquée par le modulateur FSK soit par exemple de + 150Hz.In order to have a good signal / noise ratio and to reduce intermodulation, it is desirable that the ratio between the frequency excursion of the signals modulated by frequency shift expressed in herz and the speed of transmission of the coded information to be transmitted , expressed in baud is between approximately 85 and 120% and preferably close to 100%. Thus, with a transmission speed of 300 Bauds, it is desirable that the frequency offset caused by the FSK modulator is for example + 150Hz.

La figure 5 montre de façon plus détaillée un exemple de réalisation de circuit décodeur-démodulateur 50 avec une horloge 57 comprenant un élément de référence de fréquence 70 monté en parallèle sur un condensateur 71 et des portes logiques inverseuses 73, 74, 75 associées à des résistances 77, 79, des condensateurs 72, 78 et un circuit de sortie 76 constitué par un diviseur de fréquence (par exemple par 9) qui permet de délivrer des impulsions d'horloge de l'ordre de 1MHz, par exemple à une fréquence de 8MHz divisée par 9.FIG. 5 shows in more detail an exemplary embodiment of a decoder-demodulator circuit 50 with a clock 57 comprising a frequency reference element 70 mounted in parallel on a capacitor 71 and inverting logic gates 73, 74, 75 associated with resistors 77, 79, capacitors 72, 78 and an output circuit 76 constituted by a frequency divider (for example by 9) which makes it possible to deliver clock pulses of the order of 1MHz, for example at a frequency of 8MHz divided by 9.

L'ensemble 56 des circuits de filtrage comprend des premier et deuxième filtres 56a, 56b à commutation de condensateurs et pouvant être constitués par exemple par les circuits R5620 de la Société RETICON. Les caractéristiques des filtres 56a, 56b programmables peuvent être déterminées par des interrupteurs, comme représenté sur la figure 5 ou, comme indiqué précédemment, par des signaux de commande issus du terminal 60. Les filtres 56a, 56b peuvent être du type passe-bande ou passe- haut.The assembly 56 of the filtering circuits comprises first and second filters 56a, 56b with switching of capacitors and which can be constituted for example by the circuits R5620 of the company RETICON. The characteristics of the programmable filters 56a, 56b can be determined by switches, as shown in FIG. 5 or, as indicated previously, by control signals from the terminal 60. The filters 56a, 56b can be of the bandpass type or high pass.

Le démodulateur 58 représenté sur la figure 5 présente une configuration classique avec un préamplificateur d'entrée 81, un circuit à fréquence commandé (VCD) 80, des détecteurs de phase 82 et de quadrature 83, un filtre 84 de détection de verrouillage, des filtres de boucle, et de données 85, 86, un comparateur de détection de condition de verrouillage 88, un circuit de référence interne 89 et un comparateur FSK 87 délivrant des signaux de sortie correspondant aux signaux codés transmis démodulés.The demodulator 58 shown in FIG. 5 has a conventional configuration with an input preamplifier 81, a frequency-controlled circuit (VCD) 80, phase and quadrature detectors 83, a filter 84 for detecting locking, filters loop, and data 85, 86, a latch condition detection comparator 88, an internal reference circuit 89 and a FSK comparator 87 delivering output signals corresponding to the demodulated transmitted coded signals.

Il est souhaitable que les informations codées à transmettre soient transmises selon une boucle à répétition.It is desirable that the coded information to be transmitted is transmitted in a repeating loop.

Par ailleurs, le message codé transmis comprendra avantageusement des caractères de contrôle dont un code d'effacement d'image, placé avant chaque phase de message, ainsi qu'un code de signalisation de fin de message.Furthermore, the coded message transmitted will advantageously include control characters, including an image erasure code, placed before each message phase, as well as an end of message signaling code.

Selon une application possible, le message codé transmis comprend des caractères codés non affichables et on effectue l'enregistrement des caractères codés non affichables transmis, par application des signaux filtrés et démodulés à une unité de mémoire. Ceci peut contribuer par exemple à faciliter la mesure de taux d'écoutes de station radiophoniques repérées par un code propre.According to one possible application, the transmitted coded message comprises non-displayable coded characters and the transmitted non-displayable coded characters are recorded by applying filtered and demodulated signals to a memory unit. This can help, for example, to facilitate the measurement of listening rates of radio stations identified by a specific code.

L'invention est particulièrement adaptée pour l'utilisation du décodeur-démodulateur en combinaison avec un terminal informatique personnel tel que par exemple celui connu sous la dénomination ALCATEL 250. Dans ce cas, il est souhaitable que les caractères de contrôle comportent un caractère assurant la configuration du terminal personnel en mode rouleau.The invention is particularly suitable for the use of the decoder-demodulator in combination with a personal computer terminal such as for example that known under the name ALCATEL 250. In this case, it is desirable that the control characters include a character ensuring the configuration of the personal terminal in roll mode.

Claims (13)

1. Procédé de transmission d'informations codées par voie hertzienne en superposition à une émission traditionnelle en modulation de fréquence, selon lequel on module dans une gamme de fréquences prédéterminée des informations codées à transmettre pour créer des signaux codés modulés, on mélange les signaux codés modulés aux signaux basse fréquence d'un programme traditionnel devant être radio-diffusé en modulation de fréquence, on filtre les signaux délivrés par un récepteur de modulation de fréquence pour isoler lesdits signaux codés modulés, on démodule les signaux codés modulés filtrés, et on affiche ou enregistre les informations codées transmises, par application des signaux codés filtrés et démodulés à une unité de visualisation ou d'enregistrement,
caractérisé en ce que l'on module les informations codées à transmettre par déplacement de fréquences dans une gamme de fréquences situées entre environ 15 et 18kHz, en ce que l'on mélange les signaux codés modulés par déplacement de fréquences avec une atténuation de 20 à 40dB par rapport au niveau maximum de transmission avec lesdits signaux basse fréquence d'un programme traditionnel, et en ce que le rapport entre l'excursion en fréquence des signaux codés modulés par déplacement de fréquence exprimée en herz et la vitesse de transmission des informations codées à transmettre, exprimée en bauds, est maintenu compris entre environ 85 et 120% et de préférence voisin de 100%.1. Method for transmitting coded information over the air superimposed on a traditional transmission in frequency modulation, according to which one modulates in a predetermined frequency range coded information to be transmitted to create modulated coded signals, the coded signals are mixed modulated to low frequency signals of a traditional program to be broadcast in frequency modulation, the signals delivered by a frequency modulation receiver are filtered to isolate said modulated coded signals, the filtered modulated coded signals are demodulated and displayed or records the coded information transmitted, by application of the filtered and demodulated coded signals to a display or recording unit,
characterized in that one modulates the coded information to be transmitted by displacement of frequencies in a range of frequencies located between approximately 15 and 18kHz, in that one mixes the coded signals modulated by displacement of frequencies with an attenuation of 20 to 40dB compared to the maximum level of transmission with said low frequency signals of a traditional program, and in that the ratio between the frequency excursion of coded signals modulated by frequency shift expressed in herz and the speed of transmission of coded information to be transmitted, expressed in bauds, is kept between approximately 85 and 120% and preferably close to 100%. 2. Procédé selon la revendication 1, caractérisé en ce que l'on applique les signaux modulés par déplacement de fréquences en aval des filtres stéréophoniques de l'émetteur en modulation de fréquence pour réaliser le mélange desdits signaux modulés et des signaux d'un programme traditionnel à radiodiffusion.2. Method according to claim 1, characterized in that the signals modulated by displacement of frequencies are applied downstream of the stereophonic filters of the transmitter in frequency modulation in order to mix said modulated signals and signals of a program traditional broadcasting. 3. Procédé selon la revendication 1 ou la revendication 2, caractérisé en ce que l'on prélève les signaux de réception à filtrer en amont des circuits de désaccentuation du récepteur de modulation de fréquence standard.3. Method according to claim 1 or claim 2, characterized in that one takes the reception signals to be filtered upstream of the de-emphasis circuits of the standard frequency modulation receiver. 4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'on affiche les signaux de réception filtrés et démodulés sur un terminal informatique à l'aide duquel on commande le contrôle des caractéristiques dudit filtrage.4. Method according to any one of claims 1 to 3, characterized in that the filtered and demodulated reception signals are displayed on a computer terminal using which the control of the characteristics of said filtering is controlled. 5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les informations codées à transmettre sont transmises selon une boucle à répétition.5. Method according to any one of claims 1 to 4, characterized in that the coded information to be transmitted is transmitted in a repeating loop. 6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'on effectue l'affichage des informations codées transmises par application des signaux filtrés et démodulés à une unité de visualisation d'un terminal informatique ou d'un récepteur de télévision et en ce que le message codé transmis comprend des caractères de contrôle dont un code d'effacement d'image placé avant chaque phase de message.6. Method according to any one of claims 1 to 5, characterized in that one carries out the display of the coded information transmitted by application of the filtered and demodulated signals to a display unit of a computer terminal or of a television receiver and in that the transmitted coded message comprises control characters including an image erasure code placed before each phase of the message. 7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le message codé transmis comprend des caractères codés non affichables et en ce que l'on effectue l'enregistrement des caractères codés non affichables par application des signaux filtrés et démodulés à une unité de mémoire.7. Method according to any one of claims 1 to 6, characterized in that the transmitted coded message comprises non-displayable coded characters and in that the recording of the non-displayable coded characters is carried out by application of the filtered signals and demodulated to a memory unit. 8. Dispositif de transmission d'informations codées par voie hertzienne en superposition à une émission traditionnelle en modulation de fréquence,
caractérisé en ce qu'il comprend une unité d'entrée (40) pour engendrer des informations codées à transmettre, un codeur-modulateur(30) FSK pour moduler par déplacement de fréquences les informations codées à transmettre, dans une gamme de fréquences située entre environ 15 à 18 kHz, un circuit mélangeur (32) pour superposer avec une atténuation de 20 à 40 dB les signaux modulés par déplacement de fréquence à un signal basse fréquence d'un programme traditionnel devant être appliqué à un émetteur de radiodiffusion en modulation de fréquence (20), un décodeur (50) comprenant des circuits de filtrage (56) et un démodulateur FSK (58) pour séparer les informations codées des signaux délivrés par un récepteur en modulation de fréquence standard (120), et une unité de visualisation ou d'enregistrement (60) pour l'affichage ou l'enregistrement des informations codées transmises filtrées et démodulées.8. Device for transmitting coded information by radio overlay over a traditional frequency modulation transmission,
characterized in that it comprises an input unit (40) for generating coded information to be transmitted, an encoder-modulator (30) FSK for modulating by frequency displacement the coded information to be transmitted, in a frequency range situated between approximately 15 to 18 kHz, a mixer circuit (32) for superimposing at 20 to 40 dB attenuation the signals modulated by frequency displacement on a low frequency signal of a traditional program to be applied to a broadcasting transmitter in modulation of frequency (20), a decoder (50) comprising filtering circuits (56) and an FSK demodulator (58) for separating the coded information from the signals delivered by a receiver in standard frequency modulation (120), and a display unit or recording (60) for display or recording filtered and demodulated transmitted coded information. 9. Dispositif selon la revendication 8, caractérisé en ce que ledit circuit mélangeur (32) est situé en aval des filtres stéréophoniques de l'émetteur en modulation de fréquence (20).9. Device according to claim 8, characterized in that said mixer circuit (32) is located downstream of the stereophonic filters of the transmitter in frequency modulation (20). 10. Dispositif selon l'une quelconque des revendications 8 et 9, caractérisé en ce que les signaux appliqués au décodeur (50) sont prélevés en amont des circuits de déseccentuation du récepteur de modulation de fréquence standard (120).10. Device according to any one of claims 8 and 9, characterized in that the signals applied to the decoder (50) are taken upstream of the de-eccentuation circuits of the standard frequency modulation receiver (120). 11. Dispositif selon la revendication 8 caractérisé en ce que les circuits de filtrage (56) comprennent des filtres passe-bande programmables à commutation de condensateurs, associés à une horloge (57), et en ce que l'unité de visualisation (60) est un terminal informatique, et en ce qu'une liaison (53) est prévue entre ledit terminal informatique (60) assurant l'affichage des informations codées transmises et les filtres programmables (56) du décodeur (50) pour l'envoi de codes de contrôle programmables.11. Device according to claim 8 characterized in that the filtering circuits (56) comprise programmable bandpass filters with capacitor switching, associated with a clock (57), and in that the display unit (60) is a computer terminal, and in that a link (53) is provided between said computer terminal (60) ensuring the display of the coded information transmitted and the programmable filters (56) of the decoder (50) for sending codes programmable controls. 12. Dispositif selon l'une quelconque des revendications 8 à 11, caractérisé en ce que le décodeur (5D) comprend en outre un adaptateur de niveau (55) disposé en entrée et deux organes de contrôle de niveau (63,64) disposés de part et d'autre des circuits de filtrage.12. Device according to any one of claims 8 to 11, characterized in that the decoder (5D) further comprises a level adapter (55) disposed at the input and two level control members (63,64) arranged on either side of the filter circuits. 13. Dispositif selon l'une quelconque des revendications 8 à 12, caractérisé en ce que le déplacement de fréquences du codeur-modulateur(30) est de l'ordre de 300Hz pour une vitesse de transmission d'informations codées de l'ordre de 300 bauds.13. Device according to any one of claims 8 to 12, characterized in that the frequency displacement of the coder-modulator (30) is of the order of 300Hz for a transmission speed of coded information of the order of 300 baud.
EP85401547A 1984-07-30 1985-07-29 Method and arrangement for transmitting coded information by radio channel in superposition on a traditional frequency modulation transmission Expired - Lifetime EP0172095B1 (en)

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AT85401547T ATE64048T1 (en) 1984-07-30 1985-07-29 METHOD AND EQUIPMENT FOR TRANSMISSION OF CODED INFORMATION VIA A RADIO CHANNEL BY OVERLAYING ON A CONVENTIONAL FM TRANSMISSION.

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FR8412092A FR2568432B1 (en) 1984-07-30 1984-07-30 METHOD AND DEVICE FOR TRANSMITTING CODED INFORMATION OVER THE WIRE OVERLAY ON A TRADITIONAL FREQUENCY MODULATED TRANSMISSION
FR8412092 1984-07-30

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US7460991B2 (en) 2000-11-30 2008-12-02 Intrasonics Limited System and method for shaping a data signal for embedding within an audio signal
US7505823B1 (en) 1999-07-30 2009-03-17 Intrasonics Limited Acoustic communication system
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Cited By (20)

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FR2619662A1 (en) * 1987-08-19 1989-02-24 Bernard Alain Method of transmitting information relating to racing and receiver for implementing this method
WO1989007374A1 (en) * 1988-02-08 1989-08-10 Robert John Suffern Apparatus for transmitting information
EP0338917A1 (en) * 1988-04-22 1989-10-25 Denis Marinier Communication method and device with subcarriers integrated in an analogous or digital signal
FR2630604A1 (en) * 1988-04-22 1989-10-27 Marinier Denis METHOD AND APPARATUS FOR COMMUNICATION BY INTEGRATED SUBCARKERS IN AN ANALOG OR DIGITAL SIGNAL
WO1989010662A1 (en) * 1988-04-22 1989-11-02 Denis Marinier Communication process and device, by sub-carriers integrated in an analog or digital signal
DE3937515A1 (en) * 1989-10-16 1991-04-25 Falter & Funk Gmbh Co METHOD FOR TRANSMITTING AUDIO INFORMATION AND / OR DIGITAL INFORMATION AND DEVICE FOR IMPLEMENTING THE METHOD
ES2048043A2 (en) * 1991-08-14 1994-03-01 Baranoff Rossine Method and device for radio transmission of encoded data superimposed on a traditional frequency modulated broadcast
GR910100504A (en) * 1991-12-18 1993-08-31 Baranoff Rossine Dimitri Method and arrangement for the transmission of coded data
EP0548471A1 (en) * 1991-12-20 1993-06-30 BOSCH-SIEMENS HAUSGERÄTE GmbH Broadcast receiving apparatus for the reception, in conformity with the norms, of sound programs
US5630203A (en) * 1993-01-12 1997-05-13 Weinblatt; Lee S. Technique for surveying a radio or a television audience
EP0606703A1 (en) * 1993-01-12 1994-07-20 Lee S. Weinblatt Method for surveying a radio or a television audience, carrying programme identification signals in the sound channel
US5826164A (en) * 1993-01-12 1998-10-20 Weinblatt; Lee S. Technique for surveying a radio or a television audience
EP0639933A2 (en) * 1993-08-19 1995-02-22 Samsung Electronics Co., Ltd. Method and apparatus for processing an audio signal by surround modes
EP0639933A3 (en) * 1993-08-19 1995-11-02 Samsung Electronics Co Ltd Method and apparatus for processing an audio signal by surround modes.
US6850555B1 (en) 1997-01-16 2005-02-01 Scientific Generics Limited Signalling system
US7796676B2 (en) 1997-01-16 2010-09-14 Intrasonics Limited Signalling system
US7505823B1 (en) 1999-07-30 2009-03-17 Intrasonics Limited Acoustic communication system
US7460991B2 (en) 2000-11-30 2008-12-02 Intrasonics Limited System and method for shaping a data signal for embedding within an audio signal
US7796978B2 (en) 2000-11-30 2010-09-14 Intrasonics S.A.R.L. Communication system for receiving and transmitting data using an acoustic data channel
US8185100B2 (en) 2000-11-30 2012-05-22 Intrasonics S.A.R.L. Communication system

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ATE64048T1 (en) 1991-06-15
DE3582979D1 (en) 1991-07-04
EP0172095B1 (en) 1991-05-29
FR2568432B1 (en) 1990-06-29
JPS6199446A (en) 1986-05-17
CA1253920A (en) 1989-05-09
FR2568432A1 (en) 1986-01-31

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