EP0714183A2 - Method for synchronisation of a radio data receiver and broadcast receiver using this method - Google Patents
Method for synchronisation of a radio data receiver and broadcast receiver using this method Download PDFInfo
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- EP0714183A2 EP0714183A2 EP95118045A EP95118045A EP0714183A2 EP 0714183 A2 EP0714183 A2 EP 0714183A2 EP 95118045 A EP95118045 A EP 95118045A EP 95118045 A EP95118045 A EP 95118045A EP 0714183 A2 EP0714183 A2 EP 0714183A2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
- H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
- H04H20/34—Arrangements for simultaneous broadcast of plural pieces of information by plural channels using an out-of-band subcarrier signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H2201/00—Aspects of broadcast communication
- H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
- H04H2201/13—Aspects of broadcast communication characterised by the type of broadcast system radio data system/radio broadcast data system [RDS/RBDS]
Definitions
- the present invention relates to a method for synchronizing a radio receiver, which operates in a radio system in which, in addition to the actual program, additional information, such as a program identification (PI) code, is transmitted in the form of a serially transmitted binary data stream, the data stream being divided into individual ones Blocks is divided, each containing a so-called offset word, a useful word, in particular a radio data system (RDS) receiver for the received data stream, by examining the received data stream for the presence of a known bit sequence.
- PI program identification
- RDS radio data system
- the present invention relates to a radio receiver that works according to this method.
- a binary data stream is transmitted inaudibly for the radio listener, which contains a series of tuning, switching and operating information.
- a program identification code (PI code) is continuously transmitted as a tuning aid, which allows the assignment of a transmission frequency to a program chain.
- the offset words contained in each transmitted block are used for synchronization with the data stream.
- the offset words in this system each have a length of ten bits and there are a total of five different offset words, so that every 5 x 210 bits are random a bit sequence occurs that corresponds to one of the offset words. Due to the transmission rate of the data stream, this means that the bit sequence of an offset word occurs randomly after every six seconds. This error rate is prohibitively high, so that pure block synchronization is not sufficient.
- a group synchronization is therefore additionally carried out in that the synchronization is only considered complete when two offset words are found offset from one another by a block or more. This means that at least two valid blocks must be recognized before synchronization is complete. Accordingly, the synchronization time is at least the transmission time of two blocks.
- reception conditions With poor reception conditions, it is difficult to identify two fully received offset words at intervals of one or more blocks, since the error rate of the received RDS signals is then correspondingly high. Especially when reception conditions are poor, it is important to check alternative frequencies and to have as many alternative frequencies identified as possible in order to be able to switch back and forth between them. If the synchronization now takes too long, the associated alternative frequencies either cannot be identified or there are mute pauses that lie above the hearing threshold.
- the invention is therefore based on the object of specifying a method for synchronizing a radio receiver of the type mentioned at the outset, which enables faster synchronization and, in particular even in the case of poor reception conditions, ensures that alternative frequencies are found without long mute pauses.
- This object is achieved in that at least part of an expected useful word is used for synchronization, in that the data stream is at least also examined for the presence of the bit sequence of the expected useful word or part of the useful word.
- the useful words have a length of 16 bits, so that a longer bit sequence is available for synchronization than the bit sequence used in known methods.
- another known word in particular one relating to the useful word, can also be used according to the invention appropriate offset word can be used.
- the data stream is therefore not examined, or not only for the presence of the known bit sequence of an offset word, but at least also for the bit sequence of an expected useful word or useful word part.
- the error probability resulting from the random occurrence of the bit sequence being sought is correspondingly reduced in the method according to the invention.
- Group synchronization can therefore be dispensed with and only one block from the data stream must be received without errors.
- the invention takes advantage of the fact that in many cases a useful word or part of a useful word is known, so that one knows that the data stream of the received program must contain a certain useful word. For example, when searching for an alternative frequency to a set program, the PI code of the program is known, since this is transmitted with the received program. The same also applies when searching for a frequency on the basis of a stored PI code in order to carry out a so-called station order or switch-on confirmation process, in which all frequencies belonging to a stored PI code are searched for and the frequency with the best reception quality is set.
- the duration of a synchronization process in the method according to the invention is significantly shortened compared to the known methods. This has an effect in particular in the case of poor reception conditions, since here the error rate of the received RDS signals is particularly high and it is therefore very difficult to find two complete offset words at a distance of one or more blocks from one another.
- the advantages according to the invention also occur not only when frequencies are switched on or off, but also when there is a loss of synchronization during reception.
- program identification code In addition to the program identification code already mentioned, other expected useful words can also be used for synchronization, in particular in conjunction with the associated offset words.
- the program identification code can be used for synchronization both with and without the regionalization part, that is to say the part which identifies a regional subroutine.
- a shift register is preferably used to check the data stream for the bit sequence sought, the content of which is compared with the bit sequence sought in a memory after each input of a new bit.
- a test template is, so to speak, placed over the received data stream.
- the radio receiver for carrying out the synchronization method according to the invention has means for at least examining the data stream for the presence of the bit sequence of at least part of an expected useful word, the means preferably having a shift register for the received data stream and a memory for the bit Episode include.
- At least part of the PI code of a set or searched radio program, in particular in connection with an associated offset word, can be stored as part of the bit sequence sought.
- This embodiment is particularly advantageous in the case of a radio receiver which has means for searching for all reception frequencies associated with a PI code stored in a memory and for setting the frequency with the best reception quality.
- the PI code of the frequency sought in each case is known and can therefore be used for synchronization.
- the figure shows a binary data stream 1, which consists of a serial sequence of individual bits 2.
- the data stream 1 is divided into blocks 3 of twenty-six bits each, of which ten bits each represent an offset word 4 and sixteen bits a useful word 5.
- the data stream 1 flows in the direction of the arrow 6. Accordingly, the offset words 4 are arranged at the beginning of each block 3.
- the bit sequence 7 consists of twenty-six bits 8, thus has the same bit length as a block 3 of the data stream 1.
- the bit sequence 7 stored in the memory corresponds to the bit sequence of an offset word 4 and a subsequent expected useful word 5.
- the data stream 1 is now pushed through a shift register 9, the length of which corresponds to the length of the bit sequence 7 stored in the memory.
- a bit is inserted into the shift register 9, its content is compared bit by bit with the bits of the bit sequence 7 contained in the memory.
- the bit sequence 7 is thus placed over the serial data stream 1 like a template and checked for agreement with the bit sequence of the data stream.
- the synchronization is complete as soon as a matching bit sequence has been found in the data stream.
- the PI code is used, which is known from the received RDS data when searching for alternative frequencies to a set program (autobest process) or when carrying out a station order or switch-on order process from the memory provided for this purpose .
- the bit sequence of the known PI code is entered into the memory for the bit sequence 7 together with a likewise known associated offset word, in order then to be compared in each case with the corresponding positions of the shift register.
- the invention enables rapid synchronization both in the case of frequency switching and in the event of loss of synchronization. There are therefore more identified alternative frequencies, which improves the autobest properties. In particular, it is possible to switch between many alternative frequencies inaudibly. Furthermore, there are shorter mute pauses when performing autobest processes with unknown alternative frequencies and when performing station best and switch-on best processes.
Abstract
Description
Die vorliegende Erfindung betrifft ein Verfahren zur Synchronisation eines Rundfunkempfängers, der in einem Rundfunksystem arbeitet, bei welchem neben dem eigentlichen Programm zusätzliche Informationen wie beispielsweise ein Programmidentifizierungs-(PI-)Code in Form eines seriell übertragenen binären Datenstromes übertragen werden, wobei der Datenstrom in einzelne Blöcke unterteilt ist, die neben einem sogenannten Offsetwort jeweils ein Nutzwort enthalten, insbesondere eines Radiodatensystem-(RDS-)Empfängers auf den empfangenen Datenstrom, indem der empfangene Datenstrom auf das Vorhandensein einer bekannten Bit-Folge untersucht wird. Darüberhinaus betrifft die vorliegende Erfindung einen Rundfunkempfänger, der nach diesem Verfahren arbeitet.The present invention relates to a method for synchronizing a radio receiver, which operates in a radio system in which, in addition to the actual program, additional information, such as a program identification (PI) code, is transmitted in the form of a serially transmitted binary data stream, the data stream being divided into individual ones Blocks is divided, each containing a so-called offset word, a useful word, in particular a radio data system (RDS) receiver for the received data stream, by examining the received data stream for the presence of a known bit sequence. In addition, the present invention relates to a radio receiver that works according to this method.
Beim Radiodatensystem wird parallel zum ausgestrahlten Rundfunkprogramm unhörbar für den Rundfunkhörer ein binärer Datenstrom übertragen, der eine Reihe von Abstimm-, Schalt- und Betriebsinformationen enthält. Unter anderem wird als Abstimmhilfe kontinuierlich ein Programmidentifizierungscode (PI-Code) übertragen, der die Zuordnung einer Sendefrequenz zu einer Programmkette erlaubt. Bei mobilem Betrieb des Rundfunkempfängers ist ein schnelles Erkennen des PI-Codes und damit eine schnelle Synchronisation des Rundfunkempfängers auf den empfangenen Datenstrom besonders wichtig.In the radio data system, parallel to the broadcast radio program, a binary data stream is transmitted inaudibly for the radio listener, which contains a series of tuning, switching and operating information. Among other things, a program identification code (PI code) is continuously transmitted as a tuning aid, which allows the assignment of a transmission frequency to a program chain. When the radio receiver is in mobile operation, quick recognition of the PI code and thus rapid synchronization of the radio receiver with the received data stream is particularly important.
Bei bekannten RDS-Empfängern werden zur Synchronisation auf den Datenstrom die in jedem übertragenen Block enthaltenen Offsetwörter verwendet, deren Bit-Folge bekannt ist. Die Offsetwörter haben bei diesem System jeweils eine Länge von zehn Bit und es gibt insgesamt fünf verschiedene Offsetwörter, so daß nach jeweils 5 x 2¹⁰ Bits zufällig eine Bit-Folge auftritt, die einem der Offsetwörter entspricht. Aufgrund der Übertragungsrate des Datenstromes bedeutet dies, daß nach jeweils sechs Sekunden zufällig die Bitfolge eines Offsetwortes auftritt. Diese Fehlerrate ist untragbar hoch, so daß eine reine Blocksynchronisation nicht ausreichend ist.In known RDS receivers, the offset words contained in each transmitted block, the bit sequence of which is known, are used for synchronization with the data stream. The offset words in this system each have a length of ten bits and there are a total of five different offset words, so that every 5 x 2¹⁰ bits are random a bit sequence occurs that corresponds to one of the offset words. Due to the transmission rate of the data stream, this means that the bit sequence of an offset word occurs randomly after every six seconds. This error rate is prohibitively high, so that pure block synchronization is not sufficient.
Bei bekannten RDS-Empfängern wird daher zusätzlich eine Gruppensynchronisation durchgeführt, indem die Synchronisation erst dann als abgeschlossen gilt, wenn zwei Offsetwörter im Abstand eines oder mehrerer Blöcke zueinander versetzt aufgefunden werden. Dies bedeutet, daß zumindest zwei gültige Blöcke erkannt sein müssen, bevor die Synchronisation abgeschlossen ist. Dementsprechend beträgt die Synchronisationszeit mindestens die Übertragungszeit von zwei Blöcken.In known RDS receivers, a group synchronization is therefore additionally carried out in that the synchronization is only considered complete when two offset words are found offset from one another by a block or more. This means that at least two valid blocks must be recognized before synchronization is complete. Accordingly, the synchronization time is at least the transmission time of two blocks.
Bei schlechten Empfangsverhältnissen ist es schwierig, zwei vollständig empfangene Offsetwörter im Abstand eines oder mehrerer Blöcke zu identifizieren, da dann die Fehlerrate der empfangenen RDS-Signale entsprechend hoch ist. Gerade bei schlechten Empfangsverhältnissen ist es aber wichtig, Alternativfrequenzen zu prüfen, und möglichst viele identifizierte Alternativfrequenzen zur Verfügung zu haben, um zwischen diesen hin- und herschalten zu können. Dauert nun die Synchronisation zu lange, so können die zugehörigen Alternativfrequenzen entweder nicht identifiziert werden oder es treten Mute-Pausen auf, die über der Hörschwelle liegen.With poor reception conditions, it is difficult to identify two fully received offset words at intervals of one or more blocks, since the error rate of the received RDS signals is then correspondingly high. Especially when reception conditions are poor, it is important to check alternative frequencies and to have as many alternative frequencies identified as possible in order to be able to switch back and forth between them. If the synchronization now takes too long, the associated alternative frequencies either cannot be identified or there are mute pauses that lie above the hearing threshold.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Synchronisation eines Rundfunkempfängers der eingangs genannten Art anzugeben, welches eine schnellere Synchronisation ermöglicht und insbesondere auch bei schlechten Empfangsverhälthissen ein Auffinden von Alternativfrequenzen ohne lange Mute-Pausen gewährleistet.The invention is therefore based on the object of specifying a method for synchronizing a radio receiver of the type mentioned at the outset, which enables faster synchronization and, in particular even in the case of poor reception conditions, ensures that alternative frequencies are found without long mute pauses.
Diese Aufgabe wird dadurch gelöst, daß wenigstens ein Teil eines erwarteten Nutzwortes zur Synchronisation verwendet wird, indem der Datenstrom zumindest auch auf das Vorhandensein der Bit-Folge des erwarteten Nutzwortes oder Nutzwortteiles untersucht wird.This object is achieved in that at least part of an expected useful word is used for synchronization, in that the data stream is at least also examined for the presence of the bit sequence of the expected useful word or part of the useful word.
Beim RDS-System weisen die Nutzwörter eine Länge von 16 Bit auf, so daß zur Synchronisation eine längere Bitfolge zur Verfügung steht als die Bitfolge, die in bekannten Verfahren verwendet wird. Zudem kann erfindungsgemäß neben dem erwarteten Nutzwort auch ein weiteres bekanntes Wort, insbesondere ein zu dem Nutzwort gehöriges Offsetwort verwendet werden. Erfindungsgemäß wird also der Datenstrom nicht oder nicht nur auf das Vorhandensein der bekannten Bitfolge eines Offsetworts untersucht, sondern zumindest auch auf die Bit-Folge eines erwarteten Nutzwortes oder Nutzwortteiles. Die sich aus dem zufälligen Auftreten der gesuchten Bit-Folge ergebende Fehlerwahrscheinlichkeit ist bei dem erfindungsgemäßen Verfahren dementsprechend verringert. Auf eine Gruppensynchronisation kann daher verzichtet werden und es muß nur ein Block aus dem Datenstrom fehlerfrei empfangen werden.In the RDS system, the useful words have a length of 16 bits, so that a longer bit sequence is available for synchronization than the bit sequence used in known methods. In addition to the expected useful word, another known word, in particular one relating to the useful word, can also be used according to the invention appropriate offset word can be used. According to the invention, the data stream is therefore not examined, or not only for the presence of the known bit sequence of an offset word, but at least also for the bit sequence of an expected useful word or useful word part. The error probability resulting from the random occurrence of the bit sequence being sought is correspondingly reduced in the method according to the invention. Group synchronization can therefore be dispensed with and only one block from the data stream must be received without errors.
Die Erfindung macht sich die Tatsache zunutze, daß in vielen Fällen ein Nutzwort oder Nutzwortteil bekannt ist, daß man also weiß, daß der Datenstrom des empfangenen Programms ein bestimmtes Nutzwort enthalten muß. Beispielsweise ist beim Aufsuchen einer Alternativfrequenz zu einem eingestellten Programm der PI-Code des Programms bekannt, da dieser mit dem empfangenen Programm übertragen wird. Dasselbe gilt auch beim Aufsuchen einer Frequenz anhand eines gespeicherten PI-Codes zur Durchführung eines sogenannten Stationbest- oder Einschaltbestvorganges, bei welchem alle zu einem gespeicherten PI-Code gehörigen Frequenzen gesucht und diejenige Frequenz mit der besten Empfangsqualität eingestellt wird.The invention takes advantage of the fact that in many cases a useful word or part of a useful word is known, so that one knows that the data stream of the received program must contain a certain useful word. For example, when searching for an alternative frequency to a set program, the PI code of the program is known, since this is transmitted with the received program. The same also applies when searching for a frequency on the basis of a stored PI code in order to carry out a so-called station order or switch-on confirmation process, in which all frequencies belonging to a stored PI code are searched for and the frequency with the best reception quality is set.
Aufgrund des Verzichts auf die Gruppensynchronisation ist die Dauer eines Synchronisationsvorganges bei dem erfindungsgemäßen Verfahren gegenüber den bekannten Verfahren deutlich verkürzt. Dies wirkt sich insbesondere bei schlechten Empfangsverhältnissen aus, da hier die Fehlerrate der empfangenen RDS-Signale besonders hoch ist und daher nur sehr schwer zwei vollständige Offsetwörter im Abstand eines oder mehrerer Blöcke zueinander aufzufinden sind. Die erfindungsgemäßen Vorteile treten im übrigen nicht nur beim Ein- oder Umschalten von Frequenzen, sondern auch bei einem während des Empfangs auftretenden Synchronisationsverlust auf.Because the group synchronization is dispensed with, the duration of a synchronization process in the method according to the invention is significantly shortened compared to the known methods. This has an effect in particular in the case of poor reception conditions, since here the error rate of the received RDS signals is particularly high and it is therefore very difficult to find two complete offset words at a distance of one or more blocks from one another. The advantages according to the invention also occur not only when frequencies are switched on or off, but also when there is a loss of synchronization during reception.
Neben dem bereits erwähnten Programmidentifizierungscode können auch andere erwartete Nutzwörter insbesondere in Verbindung mit den zugehörigen Offsetwörtern zur Synchronisation verwendet werden. Der Programmidentifizierungscode kann sowohl mit als auch ohne den Regionalisierungsteil, also den Teil, der ein regionales Unterprogramm kennzeichnet, zur Synchronisation verwendet werden.In addition to the program identification code already mentioned, other expected useful words can also be used for synchronization, in particular in conjunction with the associated offset words. The program identification code can be used for synchronization both with and without the regionalization part, that is to say the part which identifies a regional subroutine.
Zur Überprüfung des Datenstromes auf die gesuchte Bit-Folge wird bevorzugt ein Schieberegister verwendet, dessen Inhalt nach jedem Eingeben eines neuen Bits mit der in einem Speicher vorhandenen gesuchten Bit-Folge verglichen wird. Über den empfangenen Datenstrom wird also sozusagen eine Prüfschablone gelegt.A shift register is preferably used to check the data stream for the bit sequence sought, the content of which is compared with the bit sequence sought in a memory after each input of a new bit. A test template is, so to speak, placed over the received data stream.
Der Rundfunkempfänger zur Durchführung des erfindungsgemäßen Synchronisationsverfahrens weist Mittel auf, um den Datenstrom zumindest auch auf das Vorhandensein der Bit-Folge wenigstens eines Teils eines erwarteten Nutzwortes zu untersuchen, wobei die Mittel bevorzugt ein Schieberegister für den empfangenen Datenstrom und einen Speicher für die gesuchte Bit-Folge umfassen.The radio receiver for carrying out the synchronization method according to the invention has means for at least examining the data stream for the presence of the bit sequence of at least part of an expected useful word, the means preferably having a shift register for the received data stream and a memory for the bit Episode include.
In dem Speicher ist nach einer Ausgestaltung der Erfindung als Teil der gesuchten Bit-Folge zumindest ein Teil des PI-Codes eines eingestellten oder gesuchten Rundfunkprogramms, insbesondere in Verbindung mit einem zugehörigen Offsetwort speicherbar. Diese Ausgestaltung ist insbesondere bei einem Rundfunkempfänger vorteilhaft, der Mittel aufweist, um alle zu einem in einem Speicher abgelegten PI-Code gehörigen Empfangsfrequenzen zu suchen und die Frequenz mit der besten Empfangsqualität einzustellen. Bei der Durchführung eines solchen Best-Vorganges ist der PI-Code der jeweils gesuchten Frequenz bekannt und kann daher zur Synchronisation verwendet werden.According to one embodiment of the invention, at least part of the PI code of a set or searched radio program, in particular in connection with an associated offset word, can be stored as part of the bit sequence sought. This embodiment is particularly advantageous in the case of a radio receiver which has means for searching for all reception frequencies associated with a PI code stored in a memory and for setting the frequency with the best reception quality. When performing such a best process, the PI code of the frequency sought in each case is known and can therefore be used for synchronization.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend beschrieben. Die einzige Figur zeigt in schematischer Darstellung das Prinzip des erfindungsgemäßen Synchronisationsverfahrens.An embodiment of the invention is shown in the drawing and is described below. The single figure shows a schematic representation of the principle of the synchronization method according to the invention.
Die Figur zeigt einen binären Datenstrom 1, welcher aus einer seriellen Abfolge einzelner Bits 2 besteht. Der Datenstrom 1 ist in Blocks 3 zu je sechsundzwanzig Bits aufgeteilt, von denen jeweils zehn Bit ein Offsetwort 4 und sechzehn Bit ein Nutzwort 5 darstellen. Der Datenstrom 1 fließt in Richtung des Pfeiles 6. Demnach sind die Offsetwörter 4 jeweils zu Beginn eines jeden Blockes 3 angeordnet. Ebenfalls dargestellt ist eine Bit-Folge 7, die in einem nicht dargestellten Speicher abgelegt ist. Die Bit-Folge 7 besteht aus sechsundzwanzig Bits 8, hat also dieselbe BitLänge wie ein Block 3 des Datenstromes 1. Die im Speicher abgelegte Bit-Folge 7 entspricht der Bit-Folge eines Offsetwortes 4 und eines daran anschließenden erwarteten Nutzwortes 5.The figure shows a binary data stream 1, which consists of a serial sequence of
Zur Durchführung der Synchronisation wird nun der Datenstrom 1 durch ein Schieberegister 9 geschoben, dessen Länge der Länge der im Speicher gespeicherten Bit-Folge 7 entspricht. Nach jedem Einschieben eines Bits in das Schieberegister 9 wird dessen Inhalt bitweise mit den im Speicher enthaltenen Bits der Bit-Folge 7 verglichen.To carry out the synchronization, the data stream 1 is now pushed through a
Die Bit-Folge 7 wird also wie eine Schablone über den seriellen Datenstrom 1 gelegt und auf Übereinstimmung mit der Bit-Folge des Datenstroms überprüft. Die Synchronisation ist abgeschlossen, sobald eine übereinstimmende Bit-Folge im Datenstrom gefunden wurde.The
Aufgrund der Länge der Bit-Folge 7 ist die Wahrscheinlichkeit eines zufälligen Auftretens der gesuchten Bit-Folge sehr gering. Eine zusätzliche Gruppensynchronisation ist daher nicht erforderlich, so daß die Synchronisation schneller erreicht werden kann als bei bekannten Synchronisationsverfahren.Due to the length of the
Als Bit-Folge für die Synchronisation wird beispielsweise der PI-Code verwendet, der bei Aufsuchen von Alternativfrequenzen zu einem eingestellten Programm (Autobest-Vorgang) aus den empfangenen RDS-Daten oder bei Durchführung eines Stationbest- oder Einschaltbestvorgangs aus dem hierfür vorgesehenen Speicher bekannt ist. Die Bit-Folge des bekannten PI-Codes wird zusammen mit einem ebenfalls bekannten zugehörigen Offsetwort in den Speicher für die Bit-Folge 7 eingegeben, um dann jeweils mit den entsprechenden Stellen des Schieberegisters verglichen zu werden.As a bit sequence for the synchronization, for example, the PI code is used, which is known from the received RDS data when searching for alternative frequencies to a set program (autobest process) or when carrying out a station order or switch-on order process from the memory provided for this purpose . The bit sequence of the known PI code is entered into the memory for the
Die Erfindung ermöglicht eine schnelle Synchronisation sowohl bei Frequenzumschaltung als auch bei Synchronisationsverlust. Es liegen daher mehr identifizierte Alternativfrequenzen vor, wodurch die Autobest-Eigenschaften verbessert sind. Insbesondere kann unhörbar zwischen vielen Alternativfrequenzen umgeschaltet werden. Desweiteren ergeben sich kürzere Mute-Pausen bei Durchführung von Autobest-Vorgängen mit unbekannten Alternativfrequenzen und bei Durchführung von Stationbest- und Einschaltbestvorgängen.The invention enables rapid synchronization both in the case of frequency switching and in the event of loss of synchronization. There are therefore more identified alternative frequencies, which improves the autobest properties. In particular, it is possible to switch between many alternative frequencies inaudibly. Furthermore, there are shorter mute pauses when performing autobest processes with unknown alternative frequencies and when performing station best and switch-on best processes.
- 11
- DatenstromData stream
- 22nd
- Bitbit
- 33rd
- Blockblock
- 44th
- OffsetwortOffset word
- 55
- NutzwortUseful word
- 66
- Pfeilarrow
- 77
- Bit-FolgeBit sequence
- 88th
- Bitbit
- 99
- SchieberegisterShift register
Claims (9)
dadurch gekennzeichnet,
daß wenigstens ein Teil eines erwarteten Nutzworts (5) zur Synchronisation verwendet wird, indem der Datenstrom (1) zumindest auch auf das Vorhandensein der Bit-Folge des erwarteten Nutzwortes (5) oder Nutzwortteiles untersucht wird.Method for synchronizing a radio receiver that works in a radio system, in which, in addition to the actual program, additional information such as a program identification (PI) code is transmitted in the form of a serially transmitted binary data stream, the data stream being divided into individual blocks that in addition to a so-called offset word each contain a useful word, in particular a broadcast data system (RDS) receiver for the received data stream, by examining the received data stream for the presence of a known bit sequence,
characterized,
that at least part of an expected useful word (5) is used for synchronization, in that the data stream (1) is at least also examined for the presence of the bit sequence of the expected useful word (5) or useful word part.
dadurch gekennzeichnet,
daß der Datenstrom (1) zur Synchronisation auf die sich aus einem erwarteten Nutzwort (5) oder Nutzwortteil und einem zugehörigen Offsetwort ergebende Bitfolge untersucht wird.Method according to claim 1,
characterized,
that the data stream (1) for synchronization is examined for the bit sequence resulting from an expected useful word (5) or useful word part and an associated offset word.
dadurch gekennzeichnet,
daß zur Synchronisation der PI-Code des eingestellten oder gesuchten Rundfunkprogramms verwendet wird.The method of claim 1 or 2,
characterized,
that the PI code of the set or searched radio program is used for synchronization.
dadurch gekennzeichnet,
daß zur Überprüfung des Datenstromes (1) auf die gesuchte Bit-Folge ein Schieberegister (9) verwendet wird, dessen Inhalt nach jedem Eingeben eines neuen Bits mit der in einem Speicher vorhandenen gesuchten Bit-Folge (7) verglichen wird.Method according to one of claims 1 to 3,
characterized,
that a shift register (9) is used to check the data stream (1) for the bit sequence sought, the content of which is compared with the bit sequence (7) present in a memory after each input of a new bit.
dadurch gekennzeichnet,
daß Mittel vorhanden sind, um den Datenstrom (1) zumindest auch auf das Vorhandensein der Bit-Folge wenigstens eines Teils eines erwarteten Nutzwortes (5) zu untersuchen.Radio receiver for receiving a radio broadcast in a system in which, in addition to the actual program, additional information, such as a PI code in the form of a serially transmitted binary data stream, is transmitted, the data stream being divided into individual blocks, each of which contains a so-called offset word Contain useful word, in particular RDS receiver, with means for synchronizing the radio receiver with the received data stream by examining the data stream for the presence of a known bit sequence,
characterized,
that means are available to examine the data stream (1) at least also for the presence of the bit sequence of at least part of an expected useful word (5).
dadurch gekennzeichnet,
daß die Mittel ein Schieberegister (9) für den empfangenen Datenstrom (1) und einen Speicher für die gesuchte Bit-Folge (7) umfassen.Radio receiver according to claim 5,
characterized,
that the means comprise a shift register (9) for the received data stream (1) and a memory for the searched bit sequence (7).
dadurch gekennzeichnet,
daß in dem Speicher als Teil der gesuchten Bit-Folge (7) ein Offsetwort (4) speicherbar ist.Radio receiver according to claim 6,
characterized,
that an offset word (4) can be stored in the memory as part of the bit sequence (7) sought.
dadurch gekennzeichnet,
daß in dem Speicher als Teil der gesuchten Bit-Folge (7) zumindest ein Teil des PI-Codes eines eingestellten oder gesuchten Rundfunkprogramms speicherbar ist.Radio receiver according to claim 6 or 7,
characterized,
that at least part of the PI code of a set or searched radio program can be stored in the memory as part of the searched bit sequence (7).
dadurch gekennzeichnet,
daß Mittel vorhanden sind, um alle zu einem in einem Speicher abgelegten PI-Code gehörigen Empfangsfrequenzen zu suchen und die Frequenz mit der besten Empfangsqualität einzustellen.Radio receiver according to claim 8,
characterized,
that means are available to search for all reception frequencies belonging to a PI code stored in a memory and to set the frequency with the best reception quality.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19944441789 DE4441789C1 (en) | 1994-11-24 | 1994-11-24 | Data recognition system for noisy radio data signal |
| DE4441789 | 1994-11-24 | ||
| DE19539750 | 1995-10-26 | ||
| DE19539750A DE19539750C2 (en) | 1994-11-24 | 1995-10-26 | Method for synchronizing a radio receiver and radio receiver operating according to this method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0714183A2 true EP0714183A2 (en) | 1996-05-29 |
| EP0714183A3 EP0714183A3 (en) | 1998-08-05 |
Family
ID=25942247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95118045A Withdrawn EP0714183A3 (en) | 1994-11-24 | 1995-11-16 | Method for synchronisation of a radio data receiver and broadcast receiver using this method |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP0714183A3 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997050201A1 (en) * | 1996-06-25 | 1997-12-31 | Philips Electronics N.V. | A method and system for providing synchronization in a stream of messages and a transmitter and a receiver for use in such a system |
| WO1999065182A2 (en) * | 1998-06-08 | 1999-12-16 | Telefonaktiebolaget Lm Ericsson | Method of selecting synchronization pattern from a test signal |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4611334A (en) * | 1984-08-31 | 1986-09-09 | Motorola, Inc. | Message capturing radio data system |
| FR2591834B1 (en) * | 1985-12-13 | 1988-02-19 | Radiotechnique | METHOD FOR DECODING BROADCASTED DATA AND DEVICE FOR IMPLEMENTING IT |
| EP0491084A1 (en) * | 1990-12-19 | 1992-06-24 | Siemens Aktiengesellschaft | Arrangement for generating synchronous signals for block synchronisation of block coded data telegrams with off-set words and their use |
-
1995
- 1995-11-16 EP EP95118045A patent/EP0714183A3/en not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| None |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997050201A1 (en) * | 1996-06-25 | 1997-12-31 | Philips Electronics N.V. | A method and system for providing synchronization in a stream of messages and a transmitter and a receiver for use in such a system |
| WO1999065182A2 (en) * | 1998-06-08 | 1999-12-16 | Telefonaktiebolaget Lm Ericsson | Method of selecting synchronization pattern from a test signal |
| WO1999065182A3 (en) * | 1998-06-08 | 2000-02-17 | Ericsson Telefon Ab L M | Method of selecting synchronization pattern from a test signal |
| US6628737B1 (en) | 1998-06-08 | 2003-09-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Signal synchronization using synchronization pattern extracted from signal |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0714183A3 (en) | 1998-08-05 |
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