EP0118710B1 - Dispositif de synchronisation pour les signaux utiles d'un système de radiodiffusion sur fréquence commune - Google Patents

Dispositif de synchronisation pour les signaux utiles d'un système de radiodiffusion sur fréquence commune Download PDF

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Publication number
EP0118710B1
EP0118710B1 EP84100933A EP84100933A EP0118710B1 EP 0118710 B1 EP0118710 B1 EP 0118710B1 EP 84100933 A EP84100933 A EP 84100933A EP 84100933 A EP84100933 A EP 84100933A EP 0118710 B1 EP0118710 B1 EP 0118710B1
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EP
European Patent Office
Prior art keywords
signal
intelligence
synchronising
modulation
synchronising signal
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
Application number
EP84100933A
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German (de)
English (en)
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EP0118710A1 (fr
Inventor
Harry Koch
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.)
Bosch Telecom GmbH
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ANT Nachrichtentechnik GmbH
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Publication of EP0118710A1 publication Critical patent/EP0118710A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/67—Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency

Definitions

  • the invention relates to a synchronization device according to the preamble of claim 1.
  • the time-synchronous and in-phase transmission of the useful signal is a requirement. If the useful signal transmitters of the single-frequency radio system arranged in spatially distributed transmission stations receive the useful signal from a control center via modulation feeders of different lengths, their runtimes are determined according to the prior art and all modulation feeders are matched to the longest transmission runtime using delay devices.
  • a test signal for time comparison is not used, which must also be stored in the individual transmitter stations and a separate synchronization signal must be obtained from an external transmitter to start it. but that only a single signal. referred to here as a synchronous signal, is required, which is emitted by a common, wireless synchronous signal transmitter, which is preferably located in the central office. From here, the synchronization signal is transmitted once wirelessly and once via the associated modulation feeder to each of the transmitting stations. There is a wireless synchronous signal receiver.
  • the synchronous signal transmitter and the synchronous signal receiver operate at the operating frequency of the single-frequency radio system on which the transmission of the useful signals also takes place; as a result, it is possible to install a useful signal receiver as a synchronous signal receiver, such as is present in large numbers on the receiving side of the single-frequency radio system, for example as a mobile receiver.
  • a useful signal transmitter can be used as a synchronous signal transmitter, as is to be installed in any transmitting station anyway. Furthermore, the use of only one transmission frequency results in good frequency economy.
  • the time-of-flight comparator present in each transmitting station which compares the time between the wirelessly received synchronization signal and the synchronization signal supplied via a modulation feeder, controls a delay device which is arranged between the modulation feeder and the useful signal transmitter of the transmission station.
  • the resulting automatic runtime comparison between the control center and the useful signal transmitter can take place in stages and should be carried out except for a residual error of less than 50 microseconds. Before the start of each useful signal transmission, such a transit time comparison can be carried out with the aid of a synchronous signal.
  • the synchronous signal In order to avoid ambiguities when comparing the transit time to the longest of the transit times occurring in the single-frequency radio system between the control center and a useful signal transmitter, the synchronous signal consists of a carrier wave train modulated in the envelope curve. A rough adjustment signal is derived from the envelope curve in the transit time comparator and a fine adjustment signal for the delay device is derived from the carrier frequency train. Envelope and carrier wave train are transmitted from the synchronous signal to the synchronous signal in phase synchronization from the control center. The transmission of the synchronous signals on the operating frequency for the useful signals of the useful signal transmitters takes place at a fixed time interval before each useful signal is transmitted.
  • the same-wave radio system is supplied with useful signals via a call processor RP, which arrive at a center Z. From here, they are fed via modulation feeders M1, M2, M3, ... to individual transmission stations S1, S2, S3, ... These modulation feeders belong to a network of modulation feeders within which line switching can occur, with the result that the runtime changes from the central station to a specific transmitting station. A runtime compensation is therefore required in each transmitter station so that the useful signal transmissions by the individual transmitter stations ultimately take place synchronously. For this reason, for example, the transmission station S1 contains a controllable delay direction V3 between its associated modulation feeder M1 and its useful signal transmitter Sn 1.
  • the control is carried out by a runtime comparator K, to which synchronization signals from the modulation feeder M1 are supplied on the one hand for the runtime comparison.
  • the runtime comparator contains wirelessly received synchronization signals from a synchronization signal receiver Es 1 contained in the transmission station S1.
  • the center Z sends a synchronization signal A (see also FIG. 2) both to the modulation feeder M1 (and of course to the other modulation feeders) and via a delay element V1 with a delay time T1 to a synchronous signal transmitter Ss for wireless transmission to the individual synchronous receivers Es.
  • the wirelessly transmitted synchronization signal arrives at the runtime comparator K essentially after the time T1 if the remaining runtimes of the wireless transmission path are neglected.
  • the synchronization signal transmitted via the modulation feeder M1 reaches the runtime comparator after the runtime T2.
  • a control signal fed to the delay device V3 on the basis of this comparison has the effect that the synchronizing signal is delayed by the time T3 (cf. D in FIG. 2).
  • T3 T1 - T2.
  • T1 is chosen so large that it is at least as long as the largest modulation feeder run time between the center and a transmitting station.
  • the delay element V1 can also be located between the synchronous signal receiver Es 1 and the runtime comparator K, where it is therefore shown again with broken lines.
  • the same transmitter can be used as the synchronous signal transmitter Ss as is provided as the useful signal transmitter Sn 1 in the individual transmitting stations.
  • the same receiver can be used as the synchronous signal receiver Es 1 in the transmitting stations as is provided on the receiving side of the useful signals as, for example, a mobile useful signal receiver En. Since the useful signal transmitters and in particular the useful signal receivers are to be provided in large numbers in a single-frequency radio system and can therefore be manufactured relatively cheaply, the synchronization device equipped with such a transmitter as a synchronous signal transmitter or with such receivers as synchronous signal receivers will also be inexpensive to set up.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Circuits Of Receivers In General (AREA)

Claims (2)

1. Dispositif de synchronisation des signaux utiles d'un système de radiodiffusion sur fréquence commune, dans lequel plusieurs stations d'émission, comprenant chacune un émetteur de signaux utiles (Sn1) à émettre au synchronisme et reçus d'un poste central (Z) par une ligne de modulation (M1), émettent des porteuses modulées par ces signaux utiles à une fréquence sensiblement constante vers des récepteurs de signaux utiles (En), ledit dispositif présentant les particularités suivantes :
a) un émetteur de signaux de synchronisation (Ss) sans fil et commun est affecté aux stations d'émission (S1) pour l'émission répétée et automatique d'un signal de synchronisation ;
b) un récepteur de signaux de synchronisation (Es1) sans fil est affecté à chaque station d'émission (S1) ;
c) les stations d'émission (S1) comportent chacune un dispositif de retard commandé (V3) pour les signaux utiles et une mémoire contenant le retard commandé entre des opérations d'asservissement successives ;
d) un comparateur de temps de propagation (K) est affecté à chaque émetteur de signaux utiles (Sn1) comportant un dispositif de retard commandé (V3), pour la commande de ce dernier en fonction de la différence de temps de propagation entre la transmission sans fil d'une part et la transmission par une ligne de modulation (M1) d'autre part, de façon à permettre une émission pratiquement synchrone des signaux utiles par ces émetteurs (Sn1). et étant caractérisé en ce que :
e) le poste central (Z) est équipé d'un dispositif pour l'injection du signal de synchronisation sur la ligne de modulation (M1), coordonnée avec l'émission sans fil du signal de synchronisation ;
f) le comparateur de temps de propagation (K) détermine la composante variable de la différence de temps de propagation entre le signal de synchronisation reçu sans fil et le même signal de synchronisation transmis par la ligne de modulation (M1) à la station d'émission considérée (Si) ;
g) l'émetteur (Ss) et les récepteurs (Es1) de signaux de synchronisation fonctionnent à la fréquence de service du système de radiodiffusion sur fréquence commune pour la transmission des signaux utiles, un récepteur de signaux utiles (En) étant utilisable comme récepteur de signaux de synchronisation (Es1) et un émetteur de signaux utiles (Sn1) comme émetteur de signaux de synchronisation (Ss) ;
h) l'émission du signal de synchronisation et son injection sur la ligne de modulation (M1) s'effectuent chacune à un intervalle de temps fixe avant le début d'émissions déterminées, et en particulier de chaque émission de signal utile ; et
i) une porteuse à enveloppe modulée au synchronisme de phase est émise comme signal de modulation, le comparateur de temps de propagation (K) dérivant un signal de précom- mande à partir de l'enveloppe et un signal de commande fine du dispositif de retard (V3) à partir de la porteuse.
2. Dispositif de synchronisation selon revendication 1, caractérisé en ce que le signal de synchronisation est transmis au comparateur de temps de propagation (K) avec un retard (T1) par rapport à sa transmission depuis le poste central (Z) par la ligne de modulation (Mi), ce retard étant au moins égal au temps de propagation maximale des signaux utiles sur une ligne de modulation (M1) entre le poste central (Z) et l'émetteur de signaux utiles (Sn1) correspondant à ladite ligne (M1).
EP84100933A 1983-03-12 1984-01-31 Dispositif de synchronisation pour les signaux utiles d'un système de radiodiffusion sur fréquence commune Expired EP0118710B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3308957 1983-03-12
DE3308957 1983-03-12

Publications (2)

Publication Number Publication Date
EP0118710A1 EP0118710A1 (fr) 1984-09-19
EP0118710B1 true EP0118710B1 (fr) 1986-10-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84100933A Expired EP0118710B1 (fr) 1983-03-12 1984-01-31 Dispositif de synchronisation pour les signaux utiles d'un système de radiodiffusion sur fréquence commune

Country Status (4)

Country Link
EP (1) EP0118710B1 (fr)
DE (1) DE3460839D1 (fr)
ES (1) ES530435A0 (fr)
PT (1) PT78223B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4000538C1 (fr) * 1990-01-10 1991-03-21 Rohde & Schwarz Gmbh & Co Kg, 8000 Muenchen, De

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI71452C (fi) * 1985-04-10 1986-12-19 Arvo Mustonen Synkroniseringsfoerfarande foer ett lokalt t ex riksomfattandepersonsoekarnaets radiosaendare
CH663126A5 (de) * 1985-04-19 1987-11-13 Koechler Erika Fa Verfahren zur synchronisation mehrerer taktgesteuerter sender-empfaenger.
US5280629A (en) * 1991-12-06 1994-01-18 Motorola, Inc. Technique for measuring channel delay
FR3020225B1 (fr) * 2014-04-18 2016-04-01 Tdf Dispositif de diffusion radio synchronisee par modulation de frequences

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3020176A1 (de) * 1980-05-28 1981-12-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren und anordnung zum zeitgleichen aussenden von nachrichten ueber mehrere gleichwellensender
DE3022425A1 (de) * 1980-06-14 1981-12-24 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren und anordnung zum zeitgleichen aussenden von nachrichten ueber mehrere gleichwellensender
DE3035679A1 (de) * 1980-09-22 1982-05-06 Siemens AG, 1000 Berlin und 8000 München Verfahren und schaltungsanordnung zum einstellen der zeitpunkte des aussendens von signalen von gleichwellen-funksendern, insbesondere einer fahrzeugverkehrsleitanlage
DE3133120A1 (de) * 1981-08-21 1983-03-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zum automatischen ermitteln eines laufzeitausgleichs in einem gleichwellenfunknetz

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4000538C1 (fr) * 1990-01-10 1991-03-21 Rohde & Schwarz Gmbh & Co Kg, 8000 Muenchen, De

Also Published As

Publication number Publication date
DE3460839D1 (en) 1986-11-06
ES8503902A1 (es) 1985-03-16
ES530435A0 (es) 1985-03-16
PT78223B (de) 1986-04-23
EP0118710A1 (fr) 1984-09-19
PT78223A (de) 1984-04-01

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