EP0118710A1 - Synchronizing device for the useful signals of a common frequency broadcasting system - Google Patents

Synchronizing device for the useful signals of a common frequency broadcasting system Download PDF

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Publication number
EP0118710A1
EP0118710A1 EP84100933A EP84100933A EP0118710A1 EP 0118710 A1 EP0118710 A1 EP 0118710A1 EP 84100933 A EP84100933 A EP 84100933A EP 84100933 A EP84100933 A EP 84100933A EP 0118710 A1 EP0118710 A1 EP 0118710A1
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EP
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Prior art keywords
signal
useful
intelligence
synchronous
modulation
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EP84100933A
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German (de)
French (fr)
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EP0118710B1 (en
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Harry Koch
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Bosch Telecom GmbH
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ANT Nachrichtentechnik GmbH
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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 is not used for time comparison, which must also be stored in the individual transmitter stations and a separate synchronization signal must be obtained from an external transmitter at the start, but that only a single signal, here referred to 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 synchronizing signal becomes wireless once and transmitted once via the associated modulation feeder to each of the transmitting stations. There's a wireless sync there. signal receiver available.
  • 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 transmission 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 with 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 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 on the operating frequency for the useful signals of the useful signal The synchronous signals are sent out at a fixed time interval before each useful signal is sent.
  • useful signals are sent to the single-frequency radio system 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, on the one hand, synchronization signals from the modulation feeder M1 are fed 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 central station Z sends a synchronizing signal A (see also FIG. 2) both to the modulation feeder Ml (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 zul wireless transmission to the individual synchronous receivers Es etc.
  • a synchronizing signal A see also FIG. 2
  • the wirelessly transmitted synchronous signal arrives essentially after the time T1 if the remaining running times of the wireless transmission path are neglected.
  • the synchronization signal transmitted via the modulation feeder M1 reaches the runtime comparator after the runtime 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 in the individual transmitter stations as the useful signal transmitter Sn 1.
  • the same receiver can be used as the synchronous signal receiver Es 1 in the transmitting stations as it is provided on the receiving side of the useful signals as a mobile useful signal receiver En, for example. 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 a synchronous signal receiver can be set up inexpensively.

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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)

Abstract

1. Synchronising equipment for intelligence signals of a common frequency broadcasting system, in which carrier oscillations of substantially equal frequency are radiatable by way of several transmitting stations each with a respective intelligence signal transmitter (Sn1), which from an exchange station (Z) and by way of modulation feeders (M1) receive the intelligence signals to be emitted synchronously, and are modulated by these intelligence signals for reception by intelligence signal receivers (En), with the following features : a) a common synchronising signal radio transmitter (Ss) for the repeated and automatic emission of a synchronising signal is associated with the transmitting stations (S1), b) a respective synchronising signal radio receiver (Es1) is co-ordinated with each of the transmitting stations (S1), c) the transmitting stations (S1) each display a respective trackable delay equipment (V3) for the intelligence signals as well as a store for the retention of the respectively tracked delay between successive tracking operations, d) the intelligence signal transmitters (Sn1) with trackable delay equipments (V3) are each associated with a respective transit time comparator (K) for the control of the delay equipment (V3) concerned in dependence on the transit time difference between the radio transmission on the one hand and the transmisson by way of a modulation feeder (M1) on the other hand, in such a manner that a largely synchronous intelligence signal radiation by these intelligence signal transmitters (Sn1) is made possible, characterized by the following features : e) the exchange (Z) is equipped with an equipment for the feeding-in of the synchronising signal on modulation feeders (M1), and namely for the feeding-in co-ordinated with the radio emission of the synchronising signal, f) the transmit time comparator (K) serves for the determination of the variable component of the transit time difference between the radio-received synchronising signal itself and the same synchronising signal transmitted by way of the modulation feeder (M1) to the transmitting stations (S1) concerned, g) the synchronising signal transmitter (Ss) and the synchronising signal receivers (Es1) operate on the operating frequency of the common frequency broadcasting system for the transmission of the intelligence signals, wherein an intelligence signal receiver (En) can serve as synchronising signal receiver (Es1) and an intelligence signal transmitter (Sn1) can serve as synchronising signal transmitter (Ss), h) the synchronising signal emission and the feeding-in of the synchronising signal on modulation feeders (M1) takes place each time at a fixed time spacing before the beginning of certain, in particular each of the intelligence signal emissions, and i) a respective phase-synchronous, envelope-curve-modulated carrier oscillation train, the envelope curve of which serves in the transit time comparator (K) for the derivation of a coarse control signal and the carrier oscillation of which serves for the derivation of a fine control signal for the control of the delay equipment (V3) gets to the synchronising signal emission.

Description

Die Erfindung betrifft eine Synchronisiereinrichtung nach dem Oberbegriff des Patentanspruchs 1. Zur Nutzsignalübertragung in einem Gleichwellenfunksystem ist die zeitsynchrone und phasenrichtige Aussendung des Nutzsignals Bedingung. Wenn die jeweils in räumlich verteilten Sendestationen angeordneten Nutzsignalsender des Gleichwellenfunksystems das Nutzsignal von einer Zentrale über unterschiedlich lange Modulationszubringer erhalten, werden nach dem Stand der Technik deren Laufzeiten ermittelt und alle Modulationszubringer mit Hilfe von Verzögerungseinrichtungen auf die längste übertragungslaufzeit abgeglichen.The invention relates to a synchronization device according to the preamble of claim 1. For the transmission of useful signals in a single-wave radio system, 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.

Da ein solches Verfahren in einem Gleichwellenfunksystem mit größerer Ausbreitung aufwendig und bei Umschaltungen im Netz der Modulationszubringer schlecht überschaubar ist, sind automatische Verfahren zur Adaption der Laufzeiten anzustreben. Hierzu ist es aus der DE-OS 31 32 011 bekannt, ein Testsignal von der Zentrale über die Modulationszubringer zu den einzelnen Sendestationen übertragen. Die übertragung wird eingeleitet durch ein Synchronsignal, das sowohl in der Zentrale als auch in den einzelnen Sendestationen von Zeitsignalen abgeleitet wird, die jeweils von einem externen Zeitsignalsender empfangen werden. In den einzelnen Sendestationen findet dann ein Zeitvergleich statt zwischen einerseits dem dort abgeleiteten Synchronsignal und dem über den zugehörigen Modulationszubringer angekommenen Testsignal. Das Vergleichsergebnis führt zur Nachsteuerung einer Verzögerungseinrichtung in der betreffenden Sendestation mit dem Ziel, eine synchrone Aussendung der Nutzsignale bei allen Sendestationen zu erzielen.Since such a method is complex in a single-wave radio system with a large spread and the switching of the modulation feeder in the network is difficult to understand, automatic methods for adapting the transit times are desirable. For this purpose, it is known from DE-OS 31 32 011 to transmit a test signal from the control center via the modulation feeder individual broadcasting stations. The transmission is initiated by a synchronous signal which is derived both in the control center and in the individual transmitting stations from time signals which are each received by an external time signal transmitter. A time comparison then takes place in the individual transmitting stations between the synchronous signal derived there on the one hand and the test signal arriving via the associated modulation feeder. The comparison result leads to the readjustment of a delay device in the relevant transmission station with the aim of achieving a synchronous transmission of the useful signals at all transmission stations.

Umständlich ist bei dieser Art der Synchronisierung, daß sowohl in der Zentrale als auch in den Sendestationen spezielle Empfänger für die Zeitsignale vorhanden sein müssen, aus welchen die Synchronsignale abgeleitet werden. Außerdem kann es nachteilhaft sein, daß das von der Zentrale ausgesendete Testsignal nur zu bestimmten Zeiten, nämlich beim jeweiligen Vorliegen eines Synchronsignals, gestartet werden kann.With this type of synchronization, it is cumbersome that special receivers for the time signals, from which the synchronization signals are derived, must be present both in the control center and in the transmitting stations. In addition, it can be disadvantageous that the test signal transmitted by the control center can only be started at certain times, namely when a synchronization signal is present.

Es ist Aufgabe der vorliegenden Erfindung, eine vereinfachte Synchronisiereinrichtung anzugeben.It is an object of the present invention to provide a simplified synchronization device.

Diese Aufgabe wird gelöst durch die Synchronisiereinrichtung mit den Merkmalen des Patentanspruchs 1. Eine vorteilhafte Weiterbildung ist im Patentanspruch 2 angegeben. Der Grundgedanke der Erfindung besteht darin, daß nicht ein Testsignal zum Zeitvergleich verwendet wird, das zudem in den einzelnen Sendestationen noch abgespeichert werden muß und zu dessen Start ein gesondertes Synchronsignal von einem externen Sender bezogen werden muß, sondern daß nur noch ein einziges Signal, hier als Synchronsignal bezeichnet, benötigt wird, das von einem gemeinsamen, drahtlosen Synchronsignalsender ausgesendet wird, der bevorzugt in der Zentrale steht. Von hieraus wird das Synchronsignal einmal drahtlos und einmal über den zugehörigen Modulationszubringer zu jeder ier Sendestationen übertragen. Dort ist ein drahtloser Synchron. signalempfänger vorhanden. Von besonderem Vorteil ist dabei, jaß der Synchronsignalsender und die Synchronsignalempfänger auf der Betriebsfrequenz des Gleichwellenfunksystems arbeiten, auf welcher auch die übertragung der Nutzsignale stattfindet; dadurch ist es möglich, als Synchronsignalempfänger einen Nutzsignalempfänger zu installieren, wie er auf der Empfangsseite des Gleichwellenfunksystem ohnehin in größerer Stückzahl beispielsweise als Mobilempfänger vorhanden ist. Außerdem kann als Synchronsignalsender ein Nutzsignalsender verwendet werden, wie er ohnehin in jeder Sendestation zu installieren ist. Ferner ergibt die Benutzung nur einer Übertragungsfrequenz eine gute Frequenzökonomie.This object is achieved by the synchronizing device with the features of claim 1. An advantageous further development is specified in claim 2. The basic idea of the invention is that a test signal is not used for time comparison, which must also be stored in the individual transmitter stations and a separate synchronization signal must be obtained from an external transmitter at the start, but that only a single signal, here referred to 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 synchronizing signal becomes wireless once and transmitted once via the associated modulation feeder to each of the transmitting stations. There's a wireless sync there. signal receiver available. It is particularly advantageous that 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. In addition, 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.

Der in jeder Sendestation vorhandene Laufzeitkomparator, der den Zeitvergleich vornimmt zwischen dem drahtlos empfangenen Synchronsignal und dem über einen Modulationszubringer zugeführten Synchronsignal, steuert eine Verzögerungseinrichtung, die zwischen dem Modulationszubringer und dem Nutzsignalsender der Sendestation angeordnet ist. Der dadurch bewirkte automatische Laufzeitabgleich zwischen Zentrale und Nutzsignalsender kann stufenweise erfolgen und sollte bis auf einen Restfehler von weniger als 50 Mikrosekunden durchgeführt werden. Vor dem Beginn einer jeden Nutzsignalaussendung kann ein solcher Laufzeitabgleich mit Hilfe eines Synchronsignals durchgeführt werden. Damit Mehrdeutigkeiten beim Abgleich der Laufzeit auf die längste der im Gleichwellenfunksystem zwischen der Zentrale und einem Nutzsignalsender vorkommenden Laufzeiten vermieden werden, besteht das Synchronsignal aus einem in der Hüllkurve modulierten Trägerschwingungszug. Aus der Hüllkurve wird in dem Laufzeitkomparator ein Grobeinstellungssignal und aus dem Trägerfrequenzzug ein Feineinstellungssignal für die Verzögerungseinrichtung abgeleitet. Hüllkurve und Trägerschwingungszug werden von Synchronsignal zu Synchronsignal phasensynchron zueinander von der Zentrale ausgesendet. Die auf der Betriebsfrequenz für die Nutzsignale der Nutzsignalsender erfolgende Aussendung der Synchronsignale erfolgt jeweils in einem festen zeitlichen Abstand vor jeder Nutzsignalaussendung. Da für den Laufzeitabgleich Einstellzeiten von weniger als einer Sekunde notwendig sind, ist bei einem Sendezyklus von 60 Sekunden für die Nutzsignale nur ein relativ geringer Verlust an Verkehrszeit in Kauf zu nehmen. Dieser Verlust ist auf jeden Fall geringer, als beim Stand der Technik, bei dem aufgrund nicht mit den Nutzsignal-Sendezyklen synchronisierter Zeitsignale der jeweilige Laufzeitausgleich in genügend großem zeitlichen Abstand vor einem Nutzsignalsendezyklus vorgenommen werden muß.The time-of-flight comparator present in each transmission 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 with 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. 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 on the operating frequency for the useful signals of the useful signal The synchronous signals are sent out at a fixed time interval before each useful signal is sent. Since setting times of less than one second are necessary for the runtime adjustment, only a relatively small loss of traffic time can be accepted with a transmission cycle of 60 seconds for the useful signals. This loss is in any case less than in the prior art, in which due to time signals not synchronized with the useful signal transmission cycles, the respective runtime compensation must be carried out at a sufficiently large time interval before a useful signal transmission cycle.

Anhand der Zeichnung wird ein bevorzugtes Ausführungsbeipiel der Erfindung erläutert.A preferred exemplary embodiment of the invention is explained on the basis of the drawing.

  • Fig. 1 zeigt ein Blockschaltbild eines Gleichwellenfunksystems und1 shows a block diagram of a single-frequency radio system and
  • Fig. 2 zugehörige Zeitverläufe des Synchronsignals.Fig. 2 associated time profiles of the synchronizing signal.

In Fig. 1 werden dem Gleichwellenfunksystem über einen Rufprozessor RP Nutzsignale zugeführt, die zu einer Zentrale Z gelangen. Von hier werden sie über Modulationszubringer M1, M2, M3, ...einzelnen Sendestationen S1, S2, S3, ... zugeleitet. Diese Modulationszubringer gehören zu einem Netz von Modulationszubringern, innerhalb dessen es zu Leitungsumschaltungen kommen kann, mit der Folge, daß sich die Laufzeit von der Zentrale zu einer bestimmten Sendestation ändert. In jeder Sendestation ist daher ein Laufzeitausgleich erforderlich, damit die Nutzsignalaussendungen durch die einzelnen Sendestationen letztlich synchron erfolgen. Deshalb enthält beispielsweise die Sendestation S1 zwischen ihrem zugehörigen Modulationszubringer M1 und ihrer Nutzsignalsender Sn 1 eine steuerbare Verzögerungsrichtung V3. Die Steuerung erfolgt durch einen Laufzsitkomparator K, dem einerseits zum Laufzeitvergleich Synchronsignale von dem Modulationszubringer M1 zugeführt werden. Andererseits enthält der Laufzeitkomparator drahtlos empfangene Synchronsignale von einem in der Sendestation S1 enthaltenen Synchronsignalempfänger Es 1.In FIG. 1, useful signals are sent to the single-frequency radio system 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, on the one hand, synchronization signals from the modulation feeder M1 are fed for the runtime comparison. On the other hand, the runtime comparator contains wirelessly received synchronization signals from a synchronization signal receiver Es 1 contained in the transmission station S1.

Jeweils in einem festen Zeitabstand vor der Aussendung eines Nutzsignal-Sendezyklus gibt die Zentrale Z ein Synchronsignal A (vgl. auch Fig. 2) sowohl auf den Modulationszubringer Ml (und natürlich auf die anderen Modulationszubringer) als auch über ein Verzögerungsglied V1 mit einer Verzögerungszeit T1 auf einen Synchronsignalsender Ss zul drahtlosen übertragung zu den einzelnen Synchronempfängern Es etc. Zum Laufzeitkomparator K gelangt das drahtlos übertragene Synchronsignal im wesentlichen nach der Zeit T1, wenn die restlichen Laufzeiten der drahtlosen übertragungsstrecke vernachlässigt werden. Das über den Modulationszubringer M1 übertragene Synchronsignal erreicht den Laufzeitkomparator nach der Laufzeit T2.At a fixed time interval before the transmission of a useful signal transmission cycle, the central station Z sends a synchronizing signal A (see also FIG. 2) both to the modulation feeder Ml (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 zul wireless transmission to the individual synchronous receivers Es etc. To the runtime comparator K, the wirelessly transmitted synchronous signal arrives essentially after the time T1 if the remaining running times of the wireless transmission path are neglected. The synchronization signal transmitted via the modulation feeder M1 reaches the runtime comparator after the runtime T2.

Im Laufzeitkomparator K findet nun ein Zeitvergleich zwischen den Synchronisationssignalen B und C statt. Ein aufgrund dieses Vergleiches der Verzögreungseinrichtung V3 zugeführtes Steuersignal bewirkt, daß das Synchronsignal um die Zeit T3 verzögert wird (vgl. D in Fig. 2). Dabei ist T3 = T1 - T2.In Laufzeitkomparator K now a time comparison between the S ynchronisationssignalen B and C will take place. A control signal supplied 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 wird so groß gewählt, daß es mindestens so groß ist wie die größte Modulationszubringerlaufzeit zwischen der Zentrale und einer Sendestation. Das Verzögerungsglied V1 kann sich auch zwischen dem Synchronsignalempfängre Es 1 und dem Laufzeitkomparator K befinden, wo es deshalb nochmals mit unterbrochenen Linien eingezeichnet ist.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.

Besonders vorteilhaft ist bei dem gezeigten Ausführungsbeispiel, daß als Synchronsignalsender Ss der gleiche Sender benutzt werden kann, wie er in den einzelnen Sendestationen als Nutzsignalsender Sn 1 vorgesehen ist. In entsprechender Weise kann als Synchronsignalempfänger Es 1 in den Sendestationen der gleiche Empfänger benutzt werden, wie er auf der Empfangsseite der Nutzsignale als beispielsweise mobiler Nutzsignalempfänger En vorgesehen ist. Da die Nutzsignalsender und insbesondere die Nutzsignalempfänger in einem Gleichwellenfunksystem in größerer Stückzahl vorzusehen sind und daher relativ billig hergestellt werden können, wird auch die mit einem solchen Sender als Synchronsignalsender bzw. mit solchen Empfängern als Synchrosignalempfängern bestückte Synchronisiereinrichtung preiswert einzurichten sein.It is particularly advantageous in the exemplary embodiment shown that the same transmitter can be used as the synchronous signal transmitter Ss, as is provided in the individual transmitter stations as the useful signal transmitter Sn 1. In a corresponding manner, the same receiver can be used as the synchronous signal receiver Es 1 in the transmitting stations as it is provided on the receiving side of the useful signals as a mobile useful signal receiver En, for example. 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 a synchronous signal receiver can be set up inexpensively.

In Fig. 2 kann nach dem Synchronsignal A in Gestalt eines einer Trägerschwingung aufmodulierten Rechteckimpulses sofort ohne nennenswerten Zeitabstand ein Sendezyklus von Nutzsignalen folgen. Dadurch geht wenig Verkehrszeit für die Synchronisation verloren. Dies ist deshalb möglich, weil das Synchronsignal A zu jeder beliebigen Zeit beginnen kann, da es durch systemeigene Mittel, vorzugsweise durch die Zentrale Z gestartet wird und nicht von einem willkürlichen Sendezyklus eines externen Synchronsignalsenders abhängt.2, after the synchronizing signal A in the form of a square-wave pulse modulated onto a carrier oscillation, a transmission cycle of useful signals can follow immediately without any significant time interval. This means that little traffic time is lost for synchronization. This is possible because the synchronous signal A can start at any time, since it is started by the system's own means, preferably by the center Z, and does not depend on an arbitrary transmission cycle of an external synchronous signal transmitter.

Claims (2)

1. Synchronisiereinrichtung für Nutzsignale eines Gleichwellenfunksystems, bei dem über mehrere Sendestationen mit je einem Nutzsignalsender (Sn1), welche von einer Zentrale (Z) über Modulationszubringer (M1) die synchron auszusendenen Nutzsignale erhalten, mit diesen Nutzsignalen modulierte Trägerschwingungen von im wesentlichen untereinander gleicher Frequenz abstrahlbar sind zum Empfang durch Nutzsignalempfänger (En), mit folgenden Merkmalen: a) den Sendestationen (S1) ist ein gemeinsamer, drahtloser Synchronsignalsender (Ss) zugeordnet zur wiederholten und automatischen Aussendung eines Synchronsignales, b) einigen Sendestationen (S1) ist jeweils ein drahtloser Synchronsignalempfänger (Es1) beigeordnet, c) diese Sendestationen (S1) weisen jeweils eine nachsteuerbare Verzögerungseinrichtung (V3) für die Nutzsignale auf sowie einen Speicher zum Festhalten der jeweils nachgesteuerten Verzögerung zwischen aufeinanderfolgenden Nachsteuervorgängen, d) den Nutzsignalsendern (Sn1) mit nachsteuerbaren Verzögerungseinrichtungen (V3) ist jeweils ein Laufzeitkomparator (K) zugeordnet, zur Steuerung der betreffenden Verzögerungseinrichtung (V3) in Abhängigkeit von der Laufzeitdifferenz zwischen einerseits der drahtlosen Übertragung und andererseits der übertragung über einen Modulationszubringer (M1) derart, daß eine weitgehend synchrone Nutzsignalabstrahlung durch diese Nutzsignalsender (Sn1) ermöglicht ist, gekennzeichnet durch folgende Merkmale: e) die Zentrale (Z) ist mit einer Einrichtung zur Einspeisung des Synchronsignales auf Modulationsszubringer (M1) ausgerüstet, und zwar zur Einspeisung koordiniert zur drahtlosen Aussendung des Synchronsignales, f).der Laufzeitkomparator (K) dient zur Ermittlung des veränderlichen Anteils der Laufzeitdifferenz zwischen dem drahtlos empfangenen Synchronsignal selbst und dem selben über den Modulationszubringer (M1) zur betreffenden Sendesation (S1) übertragenen Synchronsignal, g) der Synchronsignalsender (Ss) und die Synchronsignalempfänger (Es1) arbeiten auf der Betriebsfrequenz des Gleichwellenfunksystems für die Übertragung der Nutzsignale, wobei als Synchronsignalempfänger (Esl) ein Nutzsignalempfänger (En) und als Synchronsignalsender (Ss) ein Nutzsignalsender (Sn1) dienen kann, h) die Synchronsignalaussendung und die Einspeisung des Synchronsignales auf Modulationszubringer (M1) erfolgt jeweils in-einem festen zeitlichen Abstand vor dem Beginn bestimmter, insbesondere jeder der Nutzsignalaussendungen, i) zur Synchronsignalaussendung gelangt ein jeweils phasensynchron hüllkurvenmodulierter Trägerschwingungszug, dessen Hüllkurve im Laufzeitkomporator (K) zur Ableitung eines Grobsteuersignales und dessen Trägerschwingung zur Ab- leitung eines Feinsteuersignales für die Steuerung der Verzögerungseinrichtung (V3) dient. 1. Synchronizing device for useful signals of a single-wave radio system, in which, over several transmitting stations with one useful signal transmitter (Sn1), which receive the useful signals to be transmitted synchronously from a central station (Z) via modulation feeder (M1), carrier signals modulated with these useful signals of essentially the same frequency can be emitted for reception by useful signal receivers (En) with the following features: a) the transmitting stations (S1) are assigned a common, wireless synchronous signal transmitter (Ss) for the repeated and automatic transmission of a synchronous signal, b) some transmitting stations (S1) are each assigned a wireless synchronous signal receiver (Es1), c) these transmitting stations (S1) each have a re-controllable delay device (V3) for the useful signals and a memory for recording the re-controlled delay between successive post-control processes, d) the useful signal transmitters (Sn1) with retardable delay devices (V3) are each assigned a delay comparator (K) for controlling the delay device in question (V3) as a function of the difference in delay between wireless transmission on the one hand and transmission via a modulation feeder (M1) on the other in such a way that a largely synchronous useful signal radiation is made possible by these useful signal transmitters (Sn1), characterized by the following features: e) the center (Z) is equipped with a device for feeding the synchronous signal to modulation feeders (M1), specifically for the coordinated feed for wireless transmission of the synchronous signal, f). the transit time comparator (K) is used to determine the variable portion of the transit time difference between the wirelessly received synchronization signal itself and the same synchronization signal transmitted via the modulation feeder (M1) to the relevant transmission station (S1), g) the synchronous signal transmitter (Ss) and the synchronous signal receiver (Es1) operate at the operating frequency of the single-frequency radio system for the transmission of the useful signals, a useful signal receiver (En) as the synchronous signal receiver (Es) and a useful signal transmitter (Sn1) serving as the synchronous signal transmitter (Ss), h) the synchronization signal transmission and the feeding of the synchronization signal to modulation feeders (M1) take place at a fixed time interval before the start of certain, in particular each of the useful signal transmissions, i) for synchronizing signal transmission reaches a respective phase-synchronous hüllkurvenmodulierter Trägerschwingungszug whose envelope in Laufzeitkomporator (K) is used for deriving a coarse control signal and its carrier wave for deriving a fine control signal for controlling the delay means (V3). 2. Synchronisiereinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Synchronsignal gegenüber seiner Abgabe von der Zentrale (Z) über Modulationszubringer (M1) ver- zögert (T1) dem Laufzeitkomparator (K) zugeführt wird, und zwar verzögert mindestens um die längste vorkommende Laufzeit von Nutzsignalen auf einem Modulationszubringer (M1) zwischen der Zentrale (Z) und dem zum Modulationszubringer (M1) gehörenden Nutzsignalsender (Sn1).2. Synchronizing device according to claim 1, characterized in that the synchronous signal with respect to its delivery from the center (Z) via modulation feeder (M1) - delayed (T1) is fed to the transit time comparator (K), and at least delayed by the longest occurring transit time of useful signals on a modulation feeder (M1) between the center (Z) and the useful signal transmitter (Sn1) belonging to the modulation feeder (M1).
EP84100933A 1983-03-12 1984-01-31 Synchronizing device for the useful signals of a common frequency broadcasting system Expired EP0118710B1 (en)

Applications Claiming Priority (2)

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

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EP0118710A1 true EP0118710A1 (en) 1984-09-19
EP0118710B1 EP0118710B1 (en) 1986-10-01

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EP (1) EP0118710B1 (en)
DE (1) DE3460839D1 (en)
ES (1) ES8503902A1 (en)
PT (1) PT78223B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0198448A1 (en) * 1985-04-19 1986-10-22 Firma Erika Köchler Method for the synchronization of several pulsed transmitters-receivers
EP0436875A2 (en) * 1990-01-10 1991-07-17 Rohde & Schwarz GmbH & Co. KG Common wave radio system
US5124698A (en) * 1985-04-10 1992-06-23 Tecnomen Oy Method and apparatus for synchronizing radio transmitters in a paging network
EP0570547A1 (en) * 1991-12-06 1993-11-24 Motorola, Inc. Technique for measuring channel delay
FR3020225A1 (en) * 2014-04-18 2015-10-23 Tdf RADIO DIFFUSION DEVICE SYNCHRONIZED BY FREQUENCY MODULATION

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0040731A1 (en) * 1980-05-28 1981-12-02 Licentia Patent-Verwaltungs-GmbH Method and arrangement for the simultaneous transmission of information by several common-wave transmitters
EP0042144A1 (en) * 1980-06-14 1981-12-23 Licentia Patent-Verwaltungs-GmbH Method and arrangement for the simultaneous transmission of information by several common-wave transmitters
DE3035679A1 (en) * 1980-09-22 1982-05-06 Siemens AG, 1000 Berlin und 8000 München Fixed carrier wave transmission system - has several transmitters maintained in phase by regulator at central control station
EP0072984A1 (en) * 1981-08-21 1983-03-02 Licentia Patent-Verwaltungs-GmbH Method of automatically determining a time delay compensation in a common-wave radio network

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0040731A1 (en) * 1980-05-28 1981-12-02 Licentia Patent-Verwaltungs-GmbH Method and arrangement for the simultaneous transmission of information by several common-wave transmitters
EP0042144A1 (en) * 1980-06-14 1981-12-23 Licentia Patent-Verwaltungs-GmbH Method and arrangement for the simultaneous transmission of information by several common-wave transmitters
DE3035679A1 (en) * 1980-09-22 1982-05-06 Siemens AG, 1000 Berlin und 8000 München Fixed carrier wave transmission system - has several transmitters maintained in phase by regulator at central control station
EP0072984A1 (en) * 1981-08-21 1983-03-02 Licentia Patent-Verwaltungs-GmbH Method of automatically determining a time delay compensation in a common-wave radio network

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5124698A (en) * 1985-04-10 1992-06-23 Tecnomen Oy Method and apparatus for synchronizing radio transmitters in a paging network
EP0198448A1 (en) * 1985-04-19 1986-10-22 Firma Erika Köchler Method for the synchronization of several pulsed transmitters-receivers
EP0436875A2 (en) * 1990-01-10 1991-07-17 Rohde & Schwarz GmbH & Co. KG Common wave radio system
EP0436875A3 (en) * 1990-01-10 1992-05-27 Rohde & Schwarz Gmbh & Co. Kg Common wave radio system
US5218717A (en) * 1990-01-10 1993-06-08 Rohde & Schwarz Gmbh & Co. Kg Simulcast transmission system with improved synchronizing system
EP0570547A1 (en) * 1991-12-06 1993-11-24 Motorola, Inc. Technique for measuring channel delay
EP0570547A4 (en) * 1991-12-06 1993-12-15 Motorola, Inc. Technique for measuring channel delay
FR3020225A1 (en) * 2014-04-18 2015-10-23 Tdf RADIO DIFFUSION DEVICE SYNCHRONIZED BY FREQUENCY MODULATION

Also Published As

Publication number Publication date
ES530435A0 (en) 1985-03-16
PT78223B (en) 1986-04-23
DE3460839D1 (en) 1986-11-06
ES8503902A1 (en) 1985-03-16
PT78223A (en) 1984-04-01
EP0118710B1 (en) 1986-10-01

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