EP0652654B1 - Verfahren zur Detektion von Informationen im RDS-Datenstrom - Google Patents
Verfahren zur Detektion von Informationen im RDS-Datenstrom Download PDFInfo
- Publication number
- EP0652654B1 EP0652654B1 EP94117170A EP94117170A EP0652654B1 EP 0652654 B1 EP0652654 B1 EP 0652654B1 EP 94117170 A EP94117170 A EP 94117170A EP 94117170 A EP94117170 A EP 94117170A EP 0652654 B1 EP0652654 B1 EP 0652654B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rds
- transmitter
- data stream
- block
- counter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- 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
-
- 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
-
- 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 invention relates to a method for the detection of information contained in a certain block of data in a predetermined number of periodically successive groups of transmitted RDS data stream are expected, In the case of a radio receiver, the consecutively on several transmitters to be tested is set and its RDS decoder with the RDS data stream of each set station is synchronized.
- Radio receivers with particularly powerful station selection functions in particular Car radios have a separate receiver, which is constantly in the Background searches for channels worth receiving or freely definable if necessary Traffic radio stations regularly checked for traffic announcements.
- the one in the background working receiver must permanently set many different RDS transmitters and evaluate the received RDS data.
- RDS information of concern for example an announcement identifier at a traffic information station or an alternative frequency. Because this information is in certain Data blocks of the RDS data stream must be transferred after each setting on a transmitter and after synchronization of the RDS decoder on the received one RDS data stream are waited until the relevant data block is received.
- a method for recovering the RDS data stream and an RDS demodulator for Implementation of this method is known from DE 35 10 562 C2.
- the RDS demodulator does indeed A high level of interference immunity, however the downstream RDS decoder is required due to the fact that information about the phase position of the RDS data stream is neither with demodulation is still available during decoding, a considerable time to Snap into the RDS data stream.
- the for the synchronization required time, at which a period of time until the occurrence of the expected information added in a certain data block stands for others Features not available.
- the invention has for its object a method for the targeted detection of To create information in the RDS data stream, in which the majority of those for the Synchronization and waiting for the data block you are looking for so far saved and made available for other functions.
- the synchronization of the RDS decoder to one received station made only once; when voting again the same transmitter, for example to check a traffic information station the appearance of an announcement identifier, the time of appearance of the data blocks searched in advance based on the data stored in the station table Reference size can be determined. It is only at this point that the Alignment of the receiver working in the background with the one to be checked Channel.
- a certain counter reading is preferably stored as the reference variable. This can be the beginning of a reference data block in the RDS data stream of each set station, for example the first data block in a Group, i.e. the A block, or the meter reading that corresponds to the start of the specific, searched data blocks in the RDS data stream of the currently set Transmitter corresponds, for example the B block when checking for announcement identification.
- the former method offers greater flexibility and offers itself when more than one data block is to be evaluated.
- the The temporal position of the desired data block can then be based on the as The stored counter reading can be calculated.
- the second method is useful if only one data block is evaluated at a time, as the The stored counter value directly as a criterion for the Setting on the transmitter to be checked can be used.
- the setting on the transmitter to be checked takes place if the Counter reading of the free running counter with the as reference value stored counter reading.
- the RDS data are divided into periodic groups Transfer group type. Relevant information is often only in Groups of a certain type. In such cases, the preferred embodiment the procedure to tune to a station to be checked first at the time of the occurrence of the searched data block in a group of the desired one Type made. Since the group types are periodic, can be calculated in advance using the stored reference size what time the desired data block in a group of the desired Type appears.
- a car radio is used as a radio receiver assumed that an additional receiving part working in the background whose task is to identify receivable stations, Check alternative frequencies, evaluate the RDS data stream and if desired, certain traffic radio stations on the appearance of announcement identifiers to monitor.
- an additional receiving part working in the background whose task is to identify receivable stations, Check alternative frequencies, evaluate the RDS data stream and if desired, certain traffic radio stations on the appearance of announcement identifiers to monitor.
- the main recipient working in the foreground to any desired Set stations and the traffic announcements recognized in background mode to switch through at will or to store for later retrieval.
- Figure 1 shows only the receiving part working in the background.
- He contains an RF receiving part 10, the tuning stage by a frequency synthesis circuit 12 is controlled, a subsequent RDS demodulator 14, whose output controls an RDS decoder 16, two cascaded counters 18, 20, which are incremented by the data clock obtained from the RDS decoder, a microcontroller 22 and a memory 24.
- the counter 20 is a Block phase counter incremented by the RDS data clock from the RDS decoder 16 and counts from 0 to 25 and the counter 18 is a group phase counter, which counts from 0 to 3 and by overflow of the block phase counter 20 is incremented.
- the frequency of the RDS data clock is 1187.5 Hz
- Stores 24 store information for each station found and checked, which will now be explained in more detail with reference to FIG. 2.
- the RDS decoder When setting the RF receiver 10 to a transmitter that has not yet been checked , the RDS decoder is first synchronized with the received data stream. This synchronization, according to conventional methods takes at least about 110 milliseconds. As soon as the synchronization has taken place, the one just received will be Data block in relation to the random number of counters 18, 20 set. In the application example considered here, traffic radio stations are intended be checked for the appearance of announcement identifiers. To do this a bit in the B block can be checked. The meter reading now becomes the meter 18, 20 determined at the beginning of the received B data block and together with the most important characteristics of the received transmitter stored in the memory 24.
- the counter reading is a combination of the counter readings of the block phase counter 20 and the group phase counter 18 recorded in the one shown in FIG For example, the information 14/2. Accordingly, is received for everyone and checked transmitter, so that a memory table in the memory 24 is formed, the reference variable for each recorded transmitter contains a counter reading which is assigned to the beginning of a B data block.
- step 30 the RF receiver is set for the first time 10 on a traffic radio station found. This is done in step 32 the synchronization of the RDS decoder 16 on the received RDS data stream. At the same time, the count of the counters 18, 20 for the start of the B data block in the memory 24 with the most important characteristics of the received transmitter stored in memory. In the following endless loop, the RF receiving part successively set to other receivable transmitters in step 34, to be checked.
- step 36 If it is determined in step 36 that a certain amount of time has passed, after which the review of a certain traffic information station on the appearance of an announcement identifier is attached, it is checked in step 38 whether the current count of the Counter 18, 20 matches the entry in memory 24 for the transmitter in question. If there is a match, the setting is made in step 40 to traffic radio station concerned, whose B data block is then specifically evaluated becomes. Step 34 then checks other transmitters continued.
- Figure 4 illustrates this method compared to the prior art.
- the RDS decoder can only be synchronized after Reception of a complete group of 4 data blocks has been reached at the earliest after 110 milliseconds. Only then can the evaluation of the next one B data blocks occur.
- the setting is made to the on the other hand, the traffic radio station checking at the very beginning of the reception of a B data block, then targeted within a little more than its duration can be evaluated.
- Figure 5 illustrates the incoming RDS data stream shown in the drawing passes from right to left. If the B data block is checked in each case there should be a period of time between two successive B data blocks of around 65 milliseconds available, which is sufficient to, for example in the channel search the reception worthiness of a channel (stop signal) or an alternative frequency to the station currently in the foreground check.
- the examples described relate to the permanent monitoring of traffic information stations on announcements. But the invention is just as well targeted Detection of other types of information applicable in the RDS data stream.
- a Another application for a car radio is the targeted collection of information via alternative frequencies to already found transmitters.
- the described method specifically and without constant resynchronization of the RDS decoder on information of any intended type and in any for the expected information applicable group type can be accessed.
- At all Applications is not only the time saved by the elimination of the constant resynchronization beneficial to already tested channels, but it will too the security of the RDS decoding is increased since a synchronization has taken place once preserved.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
Claims (6)
- Verfahren zur Detektion von Informationen, die in einem bestimmten Datenblock des in einer vorbestimmten Anzahl von periodisch aufeinanderfolgenden Gruppen übertragenen RDS-Datenstromes erwartet werden, bei einem Rundfunkempfänger, der nacheinander auf mehrere zu prüfende Sender eingestellt wird und dessen RDS-Decoder (16) mit dem RDS-Datenstrom des jeweils eingestellten Senders synchronisiert wird (32), dadurch gekennzeichnet, daßa) ein durch den RDS-Datentakt inkrementierter Zähler (18,20), dessen Zählerstand in einer zufälligen Relation zu der Blockfolge des RDS-Datenstromes steht, jeweils bei Erreichen eines der Anzahl von Bits einer Gruppe entsprechenden Zählerstandes zurückgesetzt wird;b) bei erfolgter Synchronisation des RDS-Decoders mit dem RDS-Datenstrom des jeweils eingestellten Senders der Zählerstand des Zählers in Relation zu der Blockfolge des empfangenen RDS-Datenstromes gesetzt und eine diese Relation kennzeichnende Referenzgröße mit Kenndaten des eingestellten Senders in einer Sendertabelle (24) gespeichert wird (32);c) bei erneuter Einstellung auf einen Sender, dessen Kenndaten mit der zugehörigen Referenzgröße bereits in der Sendertabelle (24) aufgenommen sind, eine Synchronisation des RDS-Decoders unterbleibt und die zeitliche Lage des Datenblocks, in dem die Informationen erwartet werden, aus dem aktuellen Zählerstand und der aus der Sendertabelle (24) ausgelesenen Referenzgröße des eingestellten Senders errechnet wird (38).
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Referenzgröße ein Zählerstand gespeichert wird, der dem Beginn eines Referenz-Datenblocks im RDS-Datenstrom des jeweils eingestellten Senders entspricht.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Referenzgröße ein Zählerstand gespeichert wird, der dem Beginn des bestimmten Datenblocks im RDS-Datenstrom des jeweils eingestellten Senders entspricht.
- Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der Zähler aus einem Blockphasen-Zähler (20) und einem Gruppenphasen-Zähler (18) besteht, daß der Zählbereich des Blockphasen-Zählers (20) durch die Anzahl von Bits in einem Block des RDS-Datenstromes bestimmt wird und daß der Gruppenphasen-Zähler (18) bei Überlauf des Blockphasen-Zählers (20) inkrementiert wird und einen Zählbereich aufweist, der durch die Anzahl von Blöcken in einer Gruppe des RDS-Datenstromes gegeben ist.
- Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Einstellung auf einen Sender, dessen Kenndaten mit der zugehörigen Referenzgröße bereits in der Sendertabelle (24) aufgenommen sind, zum Zeitpunkt des nächsten Auftretens des bestimmten Datenblocks in dem RDS-Datenstrom dieses Senders erfolgt.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Einstellung auf einen Sender, dessen Kenndaten mit der zugehörigen Referenzgröße bereits in der Sendertabelle (24) aufgenommen sind, zum Zeitpunkt des nächsten Auftretens des bestimmten Datenblocks innerhalb einer Gruppe eines bestimmten Gruppentyps in dem RDS-Datenstrom dieses Senders erfolgt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4338412A DE4338412C1 (de) | 1993-11-10 | 1993-11-10 | Verfahren zur Detektion von Informationen im RDS-Datenstrom |
DE4338412 | 1993-11-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0652654A1 EP0652654A1 (de) | 1995-05-10 |
EP0652654B1 true EP0652654B1 (de) | 1999-01-07 |
Family
ID=6502281
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94117170A Expired - Lifetime EP0652654B1 (de) | 1993-11-10 | 1994-10-31 | Verfahren zur Detektion von Informationen im RDS-Datenstrom |
Country Status (4)
Country | Link |
---|---|
US (1) | US5553313A (de) |
EP (1) | EP0652654B1 (de) |
AT (1) | ATE175537T1 (de) |
DE (2) | DE4338412C1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08331068A (ja) * | 1995-06-05 | 1996-12-13 | Sony Corp | 受信機 |
DE19614322A1 (de) * | 1996-04-11 | 1997-10-16 | Grundig Ag | Verfahren für den Empfang und die Auswertung von RDS-Datenströmen mehrerer Sender |
WO2004023736A1 (en) * | 2002-09-07 | 2004-03-18 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and devices for efficient data transmission link control in mobile multicast communication systems |
EP1475909B1 (de) | 2003-05-08 | 2011-09-28 | Harman Becker Automotive Systems GmbH | Hintergrundtuner eines Rundfunkempfängers zum Empfangen von Verkehrs- und Reise-Information und zum Untersuchen von alternativen Frequenzen |
DE102005039054A1 (de) * | 2005-08-18 | 2007-02-22 | Bayerische Motoren Werke Ag | Verfahren und Vorrichtung zum Extrahieren von Zieldaten aus einem Zieldatenstrom |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60170344A (ja) * | 1984-02-14 | 1985-09-03 | Matsushita Electric Ind Co Ltd | 選択呼出受信装置 |
DE3510562A1 (de) * | 1985-03-23 | 1986-09-25 | Blaupunkt Werke Gmbh | Verfahren zur demodulation eines mit einer binaeren bitfolge phasenmodulierten eingangssignals und schaltungsanordnung zum durchfuehren des verfahrens |
DE3540572A1 (de) * | 1985-11-15 | 1987-05-21 | Kabelmetal Electro Gmbh | Verfahren zur synchronisation eines empfaengers bei der digitalen datenuebertragung |
FR2591834B1 (fr) * | 1985-12-13 | 1988-02-19 | Radiotechnique | Procede de decodage de donnees radiodiffusees et dispositif de mise en oeuvre |
DE3728792A1 (de) * | 1987-08-28 | 1989-03-09 | Thomson Brandt Gmbh | Schaltungsanordnung zur erkennung und/oder ueberwachung von in einem seriellen datenstrom enthaltener synchronworte |
DE3824309A1 (de) * | 1988-07-18 | 1990-01-25 | Bosch Gmbh Robert | Verfahren zur auswertung von in einem datentelegramm digital codiert empfangener verkehrsnachrichten, sowie rundfunkempfaenger |
US5252963A (en) * | 1990-01-04 | 1993-10-12 | Motorola, Inc. | "Selective call receiver" |
FR2659511A1 (fr) * | 1990-03-09 | 1991-09-13 | Portenseigne Radiotechnique | Procede d'acquisition et de comparaison des donnees d'identification de deux canaux de transmission, et appareil recepteur correspondant. |
EP0491084A1 (de) * | 1990-12-19 | 1992-06-24 | Siemens Aktiengesellschaft | Vorrichtung zum Erzeugen von Synchronsignalen zur Blocksynchronisation blockcodierter Datentelegramme mit Offset-Wörtern und deren Verwendung |
DE4106852A1 (de) * | 1991-03-04 | 1992-09-10 | Becker Autoradio | Verfahren zur abstimmung eines mikrocomputergesteuerten rundfunkempfaengers |
-
1993
- 1993-11-10 DE DE4338412A patent/DE4338412C1/de not_active Expired - Fee Related
-
1994
- 1994-10-20 US US08/326,643 patent/US5553313A/en not_active Expired - Lifetime
- 1994-10-31 AT AT94117170T patent/ATE175537T1/de not_active IP Right Cessation
- 1994-10-31 DE DE59407597T patent/DE59407597D1/de not_active Expired - Lifetime
- 1994-10-31 EP EP94117170A patent/EP0652654B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0652654A1 (de) | 1995-05-10 |
DE4338412C1 (de) | 1995-03-02 |
ATE175537T1 (de) | 1999-01-15 |
DE59407597D1 (de) | 1999-02-18 |
US5553313A (en) | 1996-09-03 |
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