EP0835561B1 - Modulation method and circuit arrangement for the transmission of data signals - Google Patents

Modulation method and circuit arrangement for the transmission of data signals Download PDF

Info

Publication number
EP0835561B1
EP0835561B1 EP96920700A EP96920700A EP0835561B1 EP 0835561 B1 EP0835561 B1 EP 0835561B1 EP 96920700 A EP96920700 A EP 96920700A EP 96920700 A EP96920700 A EP 96920700A EP 0835561 B1 EP0835561 B1 EP 0835561B1
Authority
EP
European Patent Office
Prior art keywords
data signals
signal
rds
transmission
single sideband
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96920700A
Other languages
German (de)
French (fr)
Other versions
EP0835561A1 (en
Inventor
Ralph Petersen Andress
Manfred Huberty
Thomas Stampe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Telekom AG
Original Assignee
Deutsche Telekom AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19605381A external-priority patent/DE19605381C2/en
Application filed by Deutsche Telekom AG filed Critical Deutsche Telekom AG
Publication of EP0835561A1 publication Critical patent/EP0835561A1/en
Application granted granted Critical
Publication of EP0835561B1 publication Critical patent/EP0835561B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H04H20/36—Arrangements for simultaneous broadcast of plural pieces of information for AM broadcasts

Definitions

  • the invention relates to a modulation method and a Circuit arrangement for the transmission of data signals and a receiver to receive the according to the procedure modulated and transmitted data signals.
  • Double sideband modulation basically Double sideband modulation known.
  • Double sideband modulation in the different areas of news channels again, like that Differen ignal of the stereo transmission, the RDS signal for Transmission of program-related additional information in FM radio broadcasting and the color information of the Television broadcast.
  • WO 85/05748 is already one Application of PSK modulations of a subcarrier for the compatible AM broadcast data transmission.
  • the carrier necessary for demodulating a DSB modulation is generated, for example, in stereo transmission in which the pilot frequency of 19 kHz to generate the 38 kHz Carrier in the FM multiplex signal is also transmitted.
  • the RDS demodulator chip called SAA6579T As an example the RDS demodulator chip called SAA6579T.
  • a general problem with the transfer of Radio messages of analog or digital type are provided by represents the required bandwidth of the modulation product means you have to be international or national, the natural resource of what can be used for "news" Optimal use of the frequency band.
  • SSB Single sideband process
  • the invention is therefore based on the object Method and a circuit arrangement for the transmission of Data signals via transmitters with a large coverage range to develop, the disadvantages mentioned largely be avoided.
  • the inventive method, the circuit arrangement according to the invention and the Recipients according to the invention should be quick and inexpensive be feasible, do not require the development of new chips and enable immediate use in end devices.
  • This task is accomplished using a single sideband transmission the RDS modulation (SSB-RDS) by the characteristics of claim 1 or claim 6 for the Circuit arrangement solved.
  • SSB-RDS single sideband transmission the RDS modulation
  • DBS digital double sideband modulation
  • QDSB Quadrature double sideband modulation
  • the filter method For example, by using the filter method either the lower or the upper sideband of the RDS Generate signals.
  • the digital single-sideband modulation obtained in this way can be mixed with a corresponding oscillator frequency into the desired one Transpose the transmission spectrum as can be seen from FIG. 2.
  • the RDS signal on Broadcasting long wave are overcome in that SSB methods known from analog transmission technology be transferred to the RDS QDSB modulation.
  • the difference to analog SSB modulation is Demodulation a frequency and phase correct carrier for To make available.
  • Fig. 1 is the RDS signal with its sidebands shown.
  • the processing of the RDS QDSB signal for the Long wave application is shown in Fig. 2.
  • a supplier of the RDS QDSB signal with carrier can be usually any RDS encoder known from FM RDS use.
  • the filter depends on the selected oscillator frequency of the first frequency conversion the lower (LSB + carrier) or the upper (USB + carrier) sideband available in the ZF location.
  • the second Frequency conversion serves the SSB of the RDS signal obtained with residual carrier (carrier reduced to the maximum of Sideband amplitudes) to the desired transmission frequency transpose.
  • the signal amplified to the corresponding transmission power.
  • Way the SSB signal is generated filter method, Phase method or synthetic generation
  • the application for higher quality modulation types, which are due to a DSB is not to exclude.
  • the use of the procedure is not on tied the long wave range.
  • demodulation is synchronous (more coherent Demodulator with frequency and phase correct subcarrier) as well as asynchronous (without subcarrier) possible.
  • synchronous demodulation it is necessary a residual carrier in quadrature to the sideband to transmit on the transmission side.
  • Demodulation takes place via synchronous demodulators, the transmitted residual carrier is used for synchronous demodulation.
  • Demodulation takes place directly in the baseband. Becomes asynchronous demodulated, it must be ensured on the receiving side that that the non-existing carrier cover of the side band through the demodulator is ensured.
  • the single-sideband transmission of the RDS signal (SSB-RDS) is tested on long wave with the frequency 123.7 kHz, a circuit described below according to FIG. 2 have proven to be technically feasible and advantageous Has.
  • data source 1 is a RDS coder 2 is used, which is a QDSB modulation with or can also provide without carrier frequency.
  • Residual carriers generated using the filter method at 5 and by mixing using a second mixer 6, that of a carrier is fed to a second oscillator 7 the transmission frequency implemented and amplified at 8 and Posted.
  • the residual carrier that can be switched on at the RDS encoder can thus be used ARI carriers can be used.
  • To receive the SSB-RDS signal becomes a well-known all-band receiver with synchronous demodulator used.
  • the further processing of the RDS baseband (Biphase signal) does not cause any technical problems.
  • the Application of the method is not on the long wave range bound.
  • the high-frequency signals are fed from the antenna 13 to an input amplifier 14.
  • the amplified high-frequency signal is then converted into the IF range in a mixer stage 16 and passed through a bandpass filter 17 with a bandwidth of 2.4 kHz.
  • a commercially available RDS demodulator 18 of the type SAA6579T each of which has an output 19, 20 for a clock signal and a data signal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Circuits Of Receivers In General (AREA)
  • Transmitters (AREA)
  • Traffic Control Systems (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The data source (for long-wave single-sideband transmission of the RDS signal (SSB-RDS))is an RDS coder capable of QDSB modulation with or without the carrier frequency. The RDS-SSB signal with vestigial carrier is produced by the filter method and converted to the transmission frequency by mixing. The road traffic information carrier which can be fed into the RDS coder can thus be used as the vestigial carrier. A known all-band receiver with synchronous demodulator is used for receiving the SSB-RDS signal. Further processing of the RDS baseband (biphase signal) is a straightforward matter.

Description

Die Erfindung betrifft ein Modulationsverfahren und eine Schaltungsanordnung zur Übertragung von Datensignalen und einen Empfänger zum Empfang der nach dem Verfahren modulierten und übertragenen Datensignale.The invention relates to a modulation method and a Circuit arrangement for the transmission of data signals and a receiver to receive the according to the procedure modulated and transmitted data signals.

Grundsätzlich ist zum Beispiel die Doppelseitenband-Modulation bekannt. Als Unterträgerverfahren findet man die Doppelseitenband-Modulation in den verschiedenen Bereichen von Nachrichtenkanälen wieder, wie zum Beispiel das Differen ignal der Stereoübertragung, das RDS-Signal zur Übertragung programmbezogener Zusatzinformationen im UKW-Hör-Rundfunk und die Farbinformationen der Fernsehübertragung. Durch WO 85/05748 ist auch bereits eine Anwendung von PSK-Modulationen eines Hilfsträgers für die kompatible AM-Rundfunk-Datenübertragung bekanntgeworden.For example, basically Double sideband modulation known. As One finds subcarrier procedures Double sideband modulation in the different areas of news channels again, like that Differen ignal of the stereo transmission, the RDS signal for Transmission of program-related additional information in FM radio broadcasting and the color information of the Television broadcast. Through WO 85/05748 is already one Application of PSK modulations of a subcarrier for the compatible AM broadcast data transmission.

Diese Doppelseitenband-Modulationen sind speziell in Nachrichtenkanäle integriert worden, bei welchen die Bandbreite des Signals eine untergeordnete Rolle spielt.These double sideband modulations are special in News channels have been integrated, in which the Bandwidth of the signal plays a subordinate role.

Den zur Demodulation einer DSB-Modulation notwendigen Träger erzeugt man zum Beispiel bei der Stereoübertragung, in dem die Pilotfrequenz von 19 kHz zur Generierung des 38 kHz Trägers im FM-Multiplexsignal mit übertragen wird. Andere Verfahren benutzen zur Trägerrückgewinnung einer DSB mit identischen Seitenbändern die Costa's Loop. Als Beispiel sei der RDS Demodulatorchip SAA6579T genannt.The carrier necessary for demodulating a DSB modulation is generated, for example, in stereo transmission in which the pilot frequency of 19 kHz to generate the 38 kHz Carrier in the FM multiplex signal is also transmitted. Other Use procedures for carrier recovery with a DSB identical sidebands the Costa's Loop. As an example the RDS demodulator chip called SAA6579T.

In unserem Fall, der gewollten Übertragung des RDS-Signals (QDSB mit zwei identischen Seitenbändern) im Langwellenbereich sind jedoch in Bezug auf die Bandbreite (RDS QDSB = 4,8 kHz) Grenzen gesetzt. In our case, the intended transmission of the RDS signal (QDSB with two identical sidebands) in Longwave range, however, are in terms of bandwidth (RDS QDSB = 4.8 kHz) limits set.

Eine Ausstrahlung der RDS QDSB mit dieser Bandbreite im Lang- und Längstwellenbereich (9...148,5 kHz) würde zu Nachbarkanalstörungen bereits koordinierter Datensender führen.A broadcast of the RDS QDSB with this bandwidth in Long and long wave ranges (9 ... 148.5 kHz) would become too Adjacent channel interference in coordinated data transmitters to lead.

In Anbetracht dieser Tatsache und den damit verbundenen Nachteilen einer DSB Aussendung wie,

  • 1. Doppelte Bandbreite des RF-Signals
  • 2. Aufteilung der Sendeenergie zu gleichen Teilen in die Seitenbänder, wobei nur eines benötigt wird
  • 3. Die doppelte Selektionsbandbreite für die benötigten Empfänger erhöht die Wahrscheinlichkeit des Eindringens von Störsignalen.
    • In view of this fact and the associated disadvantages of a DSB broadcast like,
  • 1. Double bandwidth of the RF signal
  • 2. Distribution of the transmission energy in equal parts into the sidebands, only one being required
  • 3. The double selection bandwidth for the required receivers increases the likelihood of interference signals.

    • Ein generelles Problem bei der Übertragung von Funknachrichten analoger bzw. digitaler Art stellt die benötigte Bandbreite des Modulationsproduktes dar. Das heißt, man muß international bzw. national bestrebt sein, die natürliche Resource des für "Nachrichten" nutzbaren Frequenzbandes optimal zu nutzen.A general problem with the transfer of Radio messages of analog or digital type are provided by represents the required bandwidth of the modulation product means you have to be international or national, the natural resource of what can be used for "news" Optimal use of the frequency band.

    Zur Reduzierung der Bandbreite ist das Einseitenbandverfahren (Single Sideband = SSB) bekanntgeworden - beispielsweise aus WO 85/04541 für QAM- oder PSK-modulierte digitale Signale. Es beruht auf der Tatsache, daß bei Doppelseitenbandmodulationen, bezogen auf den fiktiven RF-Träger zwei Seitenbänder mit gleichem Nachrichteninhalt entstehen. Zur Rückgewinnung des Nachrichteninhaltes aber nur ein Seitenband notwendig ist, was bei diesem bekannten Verfahren spezielle Schaltungen zur Decodierung der empfangenen Signale erfordert. To reduce bandwidth, that is Single sideband process (SSB) become known - for example from WO 85/04541 for QAM- or PSK-modulated digital signals. It is based on the The fact that with double sideband modulations, based on the fictitious RF carrier two sidebands with the same Message content arises. To recover the Message content but only one sideband is necessary what special circuits for this known method Decoding of the received signals required.

    Der Erfindung liegt deshalb die Aufgabe zugrunde, ein Verfahren und eine Schaltungsanordnung zur Übertragung von Datensignalen über Sender mit großer Versorgungsreichweite zu entwickeln, wobei die genannten Nachteile weitgehend vermieden werden. Das erfindungsgemäße Verfahren, die erfindungsgemäße Schaltungsanordnung und der erfindungsgemäße Empfänger sollen schnell und kostengünstig realisierbar sein, keiner Entwicklung neuer Chips bedürfen und einen sofortigen Einsatz in Endgeräten ermöglichen. The invention is therefore based on the object Method and a circuit arrangement for the transmission of Data signals via transmitters with a large coverage range to develop, the disadvantages mentioned largely be avoided. The inventive method, the circuit arrangement according to the invention and the Recipients according to the invention should be quick and inexpensive be feasible, do not require the development of new chips and enable immediate use in end devices.

    Diese Aufgabe wird mit Hilfe einer Einseitenband-Übertragung der RDS Modulation (SSB-RDS) durch die Merkmale des Patentanspruchs 1 bzw. des Patentanspruchs 6 für die Schaltungsanordnung gelöst.This task is accomplished using a single sideband transmission the RDS modulation (SSB-RDS) by the characteristics of claim 1 or claim 6 for the Circuit arrangement solved.

    Weitere Merkmale sind im jeweils kennzeichnenden Teil der Patentansprüche 2 bis 5 charakterisiert.Further features are in the characterizing part of each Claims 2 to 5 characterized.

    Der Vorteil bei der erfindungsgemäßen Lösung besteht unter anderem darin, daß die analoge Einseitenbandmodulation (SSB) sich auch auf die digitale Doppelseitenbandmodulation (DSB = 2PSK) übertragen läßt. Ein typischer Vertreter der Anwendung der Doppelseitenband-Modulation (DSB), genauer Quadratur Doppelseitenband-Modulation (QDSB) ist das RDS-Signal gemäß Fig. 1.The advantage of the solution according to the invention is below another is that the analog single sideband modulation (SSB) also deals with digital double sideband modulation (DSB = 2PSK) can be transmitted. A typical representative of the Application of double sideband modulation (DSB), more precisely Quadrature double sideband modulation (QDSB) is the RDS signal 1.

    Durch Anwendung zum Beispiel der Filtermethode läßt sich wahlweise das untere oder das obere Seitenband des RDS Signales erzeugen. Die so gewonnene digitale EinseitenbandModulation läßt sich durch Mischung mit einer entsprechenden Oszillatorfrequenz in das gewünschte Sendespektrum transponieren wie aus Fig. 2 zu ersehen ist.For example, by using the filter method either the lower or the upper sideband of the RDS Generate signals. The digital single-sideband modulation obtained in this way can be mixed with a corresponding oscillator frequency into the desired one Transpose the transmission spectrum as can be seen from FIG. 2.

    Die Aussendung eines Seitenbandes mit bzw. ohne Restträger steht in Abhängigkeit vom verwendeten Demodulationsverfahren. Beide Varianten sind zulässig (siehe Fig. 1). Daraus ergibt sich, daß nur die Hälfte der Bandbreite gegenüber einer RDS-DSB (QDSB) Aussendung belegt wird. Außerdem wird der Wirkungsgrad der Sendeanlage verbessert und damit können bei gleicher Versorgungsreichweite Energie und Betriebskosten gesenkt werden. Die Verringerung der Bandbreite läßt auf der Empfangsseite eine geringere Selektionsbandbreite zu und verringert somit die Wahrscheinlichkeit des Eindringens von Störsignalen. Ein vorteilhafter Empfänger ist in den Patentansprüchen 7 bis 9 charakterisiert. The transmission of a side band with or without a residual carrier depends on the demodulation method used. Both variants are permissible (see Fig. 1). It follows that only half of the bandwidth against an RDS-DSB (QDSB) broadcast. In addition, the efficiency of the transmitter system is improved and thus with the same supply range, energy and operating costs can be reduced. The reduction in Bandwidth leaves a lower one on the receiving side Selection bandwidth and thus reduces the Probability of interference signals. An advantageous receiver is in claims 7 characterized to 9.

    Die Erfindung wird nun im nachfolgenden anhand von in der Zeichnung dargestellten Ausführungsbeispielen näher beschrieben.The invention will now be described in more detail in the following Drawing illustrated embodiments closer described.

    In der Zeichnung zeigen:

    Fig. 1
    eine Einseitenband-Übertragung der RDS-Modulation,
    Fig. 2
    ein Prinzipschaltbild zur Realisierung des erfindungsgemäßen Verfahrens und
    Fig. 3
    ein Prinzipschaltbild eines Empfängers.
    The drawing shows:
    Fig. 1
    a single sideband transmission of the RDS modulation,
    Fig. 2
    a schematic diagram for implementing the method according to the invention and
    Fig. 3
    a schematic diagram of a receiver.

    In der Beschreibung und in den Figuren werden folgende Abkürzungen verwendet:

    ARI
    Autofahrer Rundfunkinformation
    RDS
    Radio Daten System
    SSB
    Einseitenband (single side band)
    DSB
    Doppelseitenband (double side band)
    QDSB
    Quadratur-Doppelseitenband-Modulation
    USB
    oberes Seitenband (upper side band)
    LSB
    unteres Seitenband (lower side band)
    PSK
    Phasen-Umtastung (phase shift keying)
    ZF
    Zwischenfrequenz
    The following abbreviations are used in the description and in the figures:
    ARI
    Motorists broadcasting information
    RDS
    Radio data system
    SSB
    Single side band
    DSB
    Double side band
    QDSB
    Quadrature double sideband modulation
    USB
    upper side band
    LSB
    lower side band
    PSK
    Phase shift keying
    ZF
    Intermediate frequency

    Die aufgezeigten Schwierigkeiten, das RDS Signal auf Langwelle auszustrahlen, werden dadurch überwunden, in dem aus der analogen Übertragungstechnik bekannte SSB-Verfahren auf die RDS QDSB-Modulation übertragen werden. Im Unterschied zur analogen SSB-Modulation ist zur Demodulation ein frequenz- und phasenrichtiger Träger zur Verfügung zu stellen.The difficulties shown, the RDS signal on Broadcasting long wave are overcome in that SSB methods known from analog transmission technology be transferred to the RDS QDSB modulation. in the The difference to analog SSB modulation is Demodulation a frequency and phase correct carrier for To make available.

    In Fig. 1 ist das RDS-Signal mit seinen Seitenbändern dargestellt. Der unterbrochen gezeichnete Träger bei Ωo = 57 kHz kennzeichnet den vom ARI-System bekannten unmodulierten ARI-Träger. Dieser steht in Quadratur zur RDS-Phase und kann somit zur Demodulation eines RDS QDSB-Seitenbandes genutzt werden.In Fig. 1 is the RDS signal with its sidebands shown. The interrupted bearer at Ωo = 57 kHz characterizes the one known from the ARI system unmodulated ARI carrier. This is available in quadrature RDS phase and can thus be used to demodulate an RDS QDSB sideband be used.

    Die Aufbereitung des RDS QDSB-Signales für die Langwellenanwendung wird in Fig. 2 gezeigt. Als Lieferant des RDS QDSB-Signales mit Täger (unmoduliert ARI) läßt sich in der Regel jeder von UKW-RDS bekannte RDS-Coder verwenden.The processing of the RDS QDSB signal for the Long wave application is shown in Fig. 2. As a supplier of the RDS QDSB signal with carrier (unmodulated ARI) can be usually any RDS encoder known from FM RDS use.

    Zur Erzeugung des in Fig. 1 unterbrochen umrahmten oberen Seitenbandes (USB) mit Träger wird hier die Filtermethode angewendet. Das heißt, im zweiten Schritt erfolgt eine Frequenzumsetzung des RDS QDSB-Signales (57 kHz) in die Filterbandbreite (Ωo-Ωo+ωo = 2,4 kHz) des SSB-Filters.To generate the upper framed in broken lines in FIG. 1 Sideband (USB) with carrier becomes the filter method here applied. That is, in the second step there is one Frequency conversion of the RDS QDSB signal (57 kHz) into the Filter bandwidth (Ωo-Ωo + ωo = 2.4 kHz) of the SSB filter.

    Am Ausgang des Filters, steht somit in Abhängigkeit von der gewählten Oszillatorfrequenz der ersten Frequenzumsetzung das untere (LSB+Träger) oder das obere (USB+Träger)-Seitenband in der ZF-Lage zur Verfügung. Die zweite Frequenzumsetzung dient dazu, das gewonnene SSB des RDS-Signales mit Restträger (Träger reduziert auf Maximum der Seitenbandamplituden) auf die gewünschte Sendefrequenz zu transponieren. In der nachfolgenden Stufe wird das Signal auf die entsprechende Sendeleistung verstärkt. Auf welche Art und Weise das SSB-Signal erzeugt wird (Filtermethode, Phasenmethode bzw. Synthetische Generierung) ist ohne Belang. Die Anwendung für höherwertigere Modulationsarten, welche auf eine DSB zurückzuführen sind, ist nicht auszuschließen. Die Verwendung des Verfahrens ist nicht an den Langwellenbereich gebunden.At the output of the filter, it depends on the selected oscillator frequency of the first frequency conversion the lower (LSB + carrier) or the upper (USB + carrier) sideband available in the ZF location. The second Frequency conversion serves the SSB of the RDS signal obtained with residual carrier (carrier reduced to the maximum of Sideband amplitudes) to the desired transmission frequency transpose. In the next stage the signal amplified to the corresponding transmission power. On which Way the SSB signal is generated (filter method, Phase method or synthetic generation) is without Matter. The application for higher quality modulation types, which are due to a DSB is not to exclude. The use of the procedure is not on tied the long wave range.

    Im nachfolgenden wird die Demodulation der SSB-RDS Aussendung beschrieben. The following is the demodulation of the SSB-RDS Broadcast described.

    Generell ist die Demodulation synchron (kohärender Demodulator mit frequenz- und phasenrichtigem Hilfsträger) als auch asynchron (ohne Hilfsträger) möglich. Bei Anwendung einer Art der synchronen Demodulation ist es notwendig, einen in Quadratur zum Seitenband stehenden Restträger auf der Sendeseite mit zu übertragen. Die Demodulation erfolgt über Synchrondemodulatoren, wobei der übertragene Restträger zur Synchrondemodulation verwendet wird. Die Demodulation erfolgt damit direkt ins Basisband. Wird asynchron demoduliert, muß auf der Empfangsseite dafür gesorgt werden, daß der nicht vorhandene Trägerbezug des Seitenbandes durch den Demodulator sichergestellt wird. Weiterhin ist es möglich, die Demodulation des Signals durch Vorhandensein seiner typischen spektralen Frequenzanteile entsprechend von digital 0 oder 1 zu analysieren und daraus den Datenstrom zu generieren, in dem das Seitenband asynchron demoduliert wird, einschließlich der Demodulation durch Analyse der spektralen Frequenzanteile des Modulationsproduktes. Das heißt, zur Demodulation ist man nicht an neu zu entwickelnde Chips gebunden, da das Demodulationsprodukt in jedem Fall, sofort mit handelsüblichen digitalen Schaltkreisen weiter verarbeitbar ist.In general, demodulation is synchronous (more coherent Demodulator with frequency and phase correct subcarrier) as well as asynchronous (without subcarrier) possible. When using a kind of synchronous demodulation it is necessary a residual carrier in quadrature to the sideband to transmit on the transmission side. Demodulation takes place via synchronous demodulators, the transmitted residual carrier is used for synchronous demodulation. Demodulation takes place directly in the baseband. Becomes asynchronous demodulated, it must be ensured on the receiving side that that the non-existing carrier cover of the side band through the demodulator is ensured. Furthermore it is possible to demodulate the signal by presence according to its typical spectral frequency components of digitally analyze 0 or 1 and use it to generate the data stream generate in which the sideband demodulates asynchronously , including demodulation by analyzing the spectral frequency components of the modulation product. The means that you are not in the process of developing new ones for demodulation Chips bound because the demodulation product in any case, immediately continue with commercially available digital circuits is processable.

    Die Einseitenband-Aussendung des RDS Signals (SSB-RDS) ist auf Langwelle mit der Frequenz 123,7 kHz erprobt worden, wobei eine nachfolgend beschriebene Schaltung nach Fig. 2 sich als technisch realisierbar und vorteilhaft erwiesen hat. Als Datenquelle 1 wird in einem solchen Fall ein RDS-Coder 2 verwendet, welcher eine QDSB-Modulation mit oder auch ohne Trägerfrequenz zur Verfügung stellen kann. Nach einer ersten Frequenzumsetzung mit einem ersten Mischer 3 und einem ersten Oszillator 4 wird ein SSB-Signal mit Restträger mit Hilfe der Filtermethode bei 5 erzeugt und durch Mischung mit Hilfe eines zweiten Mischers 6, dem von einem zweiten Oszillator 7 ein Träger zugeführt wird, auf die Sendefrequenz umgesetzt und bei 8 verstärkt und gesendet.The single-sideband transmission of the RDS signal (SSB-RDS) is tested on long wave with the frequency 123.7 kHz, a circuit described below according to FIG. 2 have proven to be technically feasible and advantageous Has. In such a case, data source 1 is a RDS coder 2 is used, which is a QDSB modulation with or can also provide without carrier frequency. To a first frequency conversion with a first mixer 3 and a first oscillator 4 with an SSB signal Residual carriers generated using the filter method at 5 and by mixing using a second mixer 6, that of a carrier is fed to a second oscillator 7 the transmission frequency implemented and amplified at 8 and Posted.

    Als Restträger kann somit der am RDS-Coder einschaltbare ARI-Träger verwendet werden. Zum Empfang des SSB-RDS-Signals wird ein bekannter Allbandempfänger mit Synchrondemodulator verwendet. Die Weiterverarbeitung des RDS-Basisbandes (Biphase-Signals) ergibt keine technischen Probleme. Die Anwendung des Verfahrens ist nicht an den Langwellenbereich gebunden.The residual carrier that can be switched on at the RDS encoder can thus be used ARI carriers can be used. To receive the SSB-RDS signal becomes a well-known all-band receiver with synchronous demodulator used. The further processing of the RDS baseband (Biphase signal) does not cause any technical problems. The Application of the method is not on the long wave range bound.

    Fig. 3 zeigt einen Empfänger für die mit dem erfindungsgemäßen Verfahren übertragenen Datensignale. Von der Antenne 13 werden die hochfrequenten Signale einem Eingangsverstärker 14 zugeführt. Die Frequenz fe + fZF wird von einem Oszillator 15 erzeugt, wobei fe die Frequenz des im hochfrequenten Signal enthaltenen (Rest-)Trägers und fZF = 57 kHz ist. In einer Mischstufe 16 wird dann das verstärkte hochfrequente Signal in den ZF-Bereich umgesetzt und über ein Bandfilter 17 mit einer Bandbreite von 2,4 kHz geleitet. An diesen schließt sich ein käuflich erhältlicher RDS-Demodulator 18 vom Typ SAA6579T an, der je einen Ausgang 19, 20 für ein Taktsignal und ein Datensignal aufweist. Diese Signale können nach den im Radio-Daten-System festgelegten Regeln decodiert und dann zur Anzeige gebracht werden.3 shows a receiver for the data signals transmitted with the method according to the invention. The high-frequency signals are fed from the antenna 13 to an input amplifier 14. The frequency f e + f IF is generated by an oscillator 15, where f e is the frequency of the (residual) carrier contained in the high-frequency signal and f IF = 57 kHz. The amplified high-frequency signal is then converted into the IF range in a mixer stage 16 and passed through a bandpass filter 17 with a bandwidth of 2.4 kHz. This is followed by a commercially available RDS demodulator 18 of the type SAA6579T, each of which has an output 19, 20 for a clock signal and a data signal. These signals can be decoded according to the rules defined in the radio data system and then displayed.

    Claims (10)

    1. Modulation method for the transmission of data signals, whereby a first carrier is modulated with the data signals according to the quadrature double sideband method, whereby a single sideband signal with residual carrier is derived from the modulated signal by way of the filter method or phase method, and whereby the single sideband signal is converted into the long-wave range by mixing with an oscillator frequency, and the converted single sideband signal including the converted residual carrier is transmitted.
    2. Modulation method for the transmission of data signals, whereby by means of synthetic generation there is generated a single sideband signal, double-sideband-modulated with the data signals, with residual carrier, and whereby the single sideband signal is converted into the long-wave range by mixing with an oscillator frequency, and the converted single sideband signal including the converted residual carrier is emitted.
    3. Modulation method according to claim 1, characterized in that the modulated signal is obtained with the aid of a radio data system coder.
    4. Modulation method according to one of claims 1 or 3, characterized in that the single sideband signal is generated selectively as lower or upper sideband of the modulated signal by way of filters.
    5. Circuit arrangement for the transmission of data signals, whereby the data signals can be supplied to an RDS coder (2), whereby the output of the RDS coder (2) is connected to a frequency converter (3, 4), which is connected for its part on the output side to a single sideband filter (5), the output of which is connected to another frequency converter (6, 7) for the conversion into the long-wave range, and whereby the output of the additional frequency converter (6, 7) is connected to the input of a long-wave transmitter (8).
    6. Receiver for receiving data signals, whereby the data signals are transmitted and received as modulation of a single sideband signal with residual carrier, which is converted into the long-wave range for transmission by way of mixing with an oscillator frequency, and whereby means (15, 16) are provided for the conversion of the signal, received in the long-wave range, into the frequency position of the single sideband signal with residual carrier, to the output of which a bandpass filter (17) is connected, and in that the bandpass filter is connected to a demodulator (18).
    7. Receiver according to claim 6, characterized in that the bandpass filter has a bandwidth (17) of 2.4 kHz and includes the frequency of 57 kHz.
    8. Receiver according to one of claims 6 or 7, characterized in that the demodulator (18) is an RDS demodulator known in itself.
    9. Receiver for receiving data signals, whereby the data signals are transmitted and received as modulation of a single sideband signal with residual carrier, which is converted into the long-wave range for the transmission by way of mixing with an oscillator frequency, and whereby the transmitted residual carrier is used for the synchronous demodulation.
    10. Receiver for receiving data signals, whereby the data signals are transmitted and received as modulation of a single sideband signal with residual carrier, which is converted into the long-wave range for the transmission by way of mixing with an oscillator frequency, and whereby the received sideband is demodulated asynchronously, in particular by way of analysis of the spectral frequency components of the modulation product.
    EP96920700A 1995-06-28 1996-06-26 Modulation method and circuit arrangement for the transmission of data signals Expired - Lifetime EP0835561B1 (en)

    Applications Claiming Priority (5)

    Application Number Priority Date Filing Date Title
    DE19523414 1995-06-28
    DE19523414 1995-06-28
    DE19605381A DE19605381C2 (en) 1995-06-28 1996-02-14 Modulation method and circuit arrangement for the transmission of data signals
    DE19605381 1996-02-14
    PCT/DE1996/001124 WO1997001894A1 (en) 1995-06-28 1996-06-26 Modulation method and circuit arrangement for the transmission of data signals

    Publications (2)

    Publication Number Publication Date
    EP0835561A1 EP0835561A1 (en) 1998-04-15
    EP0835561B1 true EP0835561B1 (en) 2000-03-15

    Family

    ID=26016342

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP96920700A Expired - Lifetime EP0835561B1 (en) 1995-06-28 1996-06-26 Modulation method and circuit arrangement for the transmission of data signals

    Country Status (11)

    Country Link
    EP (1) EP0835561B1 (en)
    AT (1) ATE190786T1 (en)
    BG (1) BG62545B1 (en)
    CZ (1) CZ288335B6 (en)
    EE (1) EE03365B1 (en)
    HU (1) HU220526B1 (en)
    PL (1) PL181135B1 (en)
    RO (1) RO119400B1 (en)
    RU (1) RU2194368C2 (en)
    SK (1) SK174797A3 (en)
    WO (1) WO1997001894A1 (en)

    Families Citing this family (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US10003480B2 (en) 2014-05-29 2018-06-19 Qualcomm Incorporated Asynchronous multicarrier communications
    PL414829A1 (en) 2015-11-17 2017-05-22 Audiolink Technologies Spółka Z Ograniczoną Odpowiedzialnością Method for parallel building of transmission of information through different channels and the system for parallel transmission of information through different channels

    Family Cites Families (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE2948518A1 (en) * 1979-12-01 1981-06-04 Blaupunkt Werke Gmbh Transmission system with extra data in TV signal - by modulating onto auxiliary carrier-wave and then modulating onto main carrier
    WO1985004541A1 (en) * 1984-03-28 1985-10-10 American Telephone & Telegraph Company Single-sideband communication system
    US4688255A (en) * 1984-05-29 1987-08-18 Kahn Leonard R Compatible AM broadcast/data transmisison system
    DE3821014A1 (en) * 1988-06-22 1989-12-28 Licentia Gmbh METHOD FOR DIGITAL PHASE MODULATION OF A CARRIER BY DATA SIGNALS AND DIGITAL PHASE MODULATOR FOR CARRYING OUT THE METHOD

    Also Published As

    Publication number Publication date
    PL181135B1 (en) 2001-05-31
    ATE190786T1 (en) 2000-04-15
    BG62545B1 (en) 2000-01-31
    PL324262A1 (en) 1998-05-11
    EE03365B1 (en) 2001-02-15
    HUP9802364A2 (en) 1999-02-01
    HUP9802364A3 (en) 2000-05-29
    EP0835561A1 (en) 1998-04-15
    SK174797A3 (en) 1998-11-04
    BG102091A (en) 1998-07-31
    RU2194368C2 (en) 2002-12-10
    CZ288335B6 (en) 2001-05-16
    HU220526B1 (en) 2002-03-28
    CZ351697A3 (en) 1998-04-15
    WO1997001894A1 (en) 1997-01-16
    RO119400B1 (en) 2004-08-30

    Similar Documents

    Publication Publication Date Title
    EP0591643B1 (en) Digital broadcast system with a transmitter network
    DE69718930T2 (en) METHOD AND DEVICE FOR SIMULTANEOUS RADIO TRANSMISSION OF ANALOGS AND DIGITAL BROADCASTING PROGRAMS FROM THE SAME TRANSMITTER
    DE69419961T2 (en) FM receiver with an oversampling circuit
    DE69529434T2 (en) Radio and corresponding transmission method
    DE1259416B (en) Subband fade-in and fade-in of baseband channels in the intermediate frequency position on relay points of frequency-modulated radio transmission systems
    DE3231123C2 (en)
    EP0134417B1 (en) Transmission system for tv signals in directional radio links
    DE10112025A1 (en) Method for reducing the out-of-band radiation in AM transmitters for digital transmission
    DE60123625T2 (en) DATA TRANSMISSION BY PULSE WIDTH MODULATION
    DE69330554T2 (en) ASYNCHRONOUS MODEM FOR VARIABLE SPEEDS
    EP0835561B1 (en) Modulation method and circuit arrangement for the transmission of data signals
    DE60100337T2 (en) DRM / AM simulcast
    EP0869649B1 (en) Multiresolution modulation
    DE19605381C2 (en) Modulation method and circuit arrangement for the transmission of data signals
    DE2807706C2 (en) Broadcasting system with identification signaling
    EP0874483A2 (en) Method and apparatus for simultaneous transmission of analog and digital broadcast programmes on AM frequency bands
    DE2948518A1 (en) Transmission system with extra data in TV signal - by modulating onto auxiliary carrier-wave and then modulating onto main carrier
    DE69937018T2 (en) RDS demodulator for the reception of radio programs containing radio data signals and motorists radio information signals (ARI), with a digital filter device which causes a high attenuation of the ARI signal
    DE4128045A1 (en) Noise suppression for stereo radio - compresses lower and upper side bands of differential signal in stereo transmitter
    DE19847019A1 (en) Demodulator for a multiplex signal of an RDS radio receiver
    DE1616442C (en) Method and circuit for demodulation of amplitude-modulated Zweisei tenband, residual sideband or one-sided band signals, in which the amplitude of the carrier frequency is included in full or as a remainder
    DE2658853A1 (en) STEREOPHONIC AM TRANSMISSION SYSTEM
    AT504472B1 (en) METHOD FOR TWO-TONE BELT TRANSMISSION
    DE3920330A1 (en) Data demodulation circuit for RDS receiver - has phase locked loop(s) for radio data signal demodulation and clock pulse signal generator
    EP0497424A2 (en) Broadcast receiver including a NICAM or DAB decoder

    Legal Events

    Date Code Title Description
    PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

    Free format text: ORIGINAL CODE: 0009012

    17P Request for examination filed

    Effective date: 19971209

    AK Designated contracting states

    Kind code of ref document: A1

    Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE

    AX Request for extension of the european patent

    Free format text: LT PAYMENT 971209;LV PAYMENT 971209;SI PAYMENT 971209

    RBV Designated contracting states (corrected)

    Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE

    GRAG Despatch of communication of intention to grant

    Free format text: ORIGINAL CODE: EPIDOS AGRA

    GRAG Despatch of communication of intention to grant

    Free format text: ORIGINAL CODE: EPIDOS AGRA

    GRAH Despatch of communication of intention to grant a patent

    Free format text: ORIGINAL CODE: EPIDOS IGRA

    17Q First examination report despatched

    Effective date: 19990819

    GRAH Despatch of communication of intention to grant a patent

    Free format text: ORIGINAL CODE: EPIDOS IGRA

    GRAA (expected) grant

    Free format text: ORIGINAL CODE: 0009210

    AK Designated contracting states

    Kind code of ref document: B1

    Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE

    AX Request for extension of the european patent

    Free format text: LT PAYMENT 19971209;LV PAYMENT 19971209;SI PAYMENT 19971209

    LTIE Lt: invalidation of european patent or patent extension
    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: SE

    Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

    Effective date: 20000315

    Ref country code: NL

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20000315

    Ref country code: IT

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

    Effective date: 20000315

    Ref country code: GR

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20000315

    Ref country code: GB

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20000315

    Ref country code: FR

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20000315

    Ref country code: ES

    Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

    Effective date: 20000315

    REF Corresponds to:

    Ref document number: 190786

    Country of ref document: AT

    Date of ref document: 20000415

    Kind code of ref document: T

    REG Reference to a national code

    Ref country code: CH

    Ref legal event code: EP

    REF Corresponds to:

    Ref document number: 59604693

    Country of ref document: DE

    Date of ref document: 20000420

    REG Reference to a national code

    Ref country code: IE

    Ref legal event code: FG4D

    Free format text: GERMAN

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: PT

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20000615

    Ref country code: DK

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20000615

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: LU

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20000626

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: MC

    Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

    Effective date: 20000630

    Ref country code: LI

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20000630

    Ref country code: CH

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20000630

    Ref country code: BE

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20000630

    NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
    EN Fr: translation not filed
    GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

    Effective date: 20000315

    BERE Be: lapsed

    Owner name: DEUTSCHE TELEKOM A.G.

    Effective date: 20000630

    PLBE No opposition filed within time limit

    Free format text: ORIGINAL CODE: 0009261

    STAA Information on the status of an ep patent application or granted ep patent

    Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

    REG Reference to a national code

    Ref country code: CH

    Ref legal event code: PL

    26N No opposition filed
    REG Reference to a national code

    Ref country code: IE

    Ref legal event code: FD4D

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: AT

    Payment date: 20110620

    Year of fee payment: 16

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: DE

    Payment date: 20110826

    Year of fee payment: 16

    REG Reference to a national code

    Ref country code: AT

    Ref legal event code: MM01

    Ref document number: 190786

    Country of ref document: AT

    Kind code of ref document: T

    Effective date: 20120626

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: DE

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20130101

    REG Reference to a national code

    Ref country code: DE

    Ref legal event code: R119

    Ref document number: 59604693

    Country of ref document: DE

    Effective date: 20130101

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: AT

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20120626