EP0459360A2 - RDS broadcast receiver with a device for searching for currently receivable alternative frequencies - Google Patents

RDS broadcast receiver with a device for searching for currently receivable alternative frequencies Download PDF

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Publication number
EP0459360A2
EP0459360A2 EP91108609A EP91108609A EP0459360A2 EP 0459360 A2 EP0459360 A2 EP 0459360A2 EP 91108609 A EP91108609 A EP 91108609A EP 91108609 A EP91108609 A EP 91108609A EP 0459360 A2 EP0459360 A2 EP 0459360A2
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EP
European Patent Office
Prior art keywords
receiver
rds
memory
background
code
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Granted
Application number
EP91108609A
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German (de)
French (fr)
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EP0459360A3 (en
EP0459360B1 (en
Inventor
Arnold Prof. Dr. Grundig E.M.V. Glaab
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Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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Publication of EP0459360A3 publication Critical patent/EP0459360A3/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/20—Arrangements for broadcast or distribution of identical information via plural systems
    • H04H20/22—Arrangements for broadcast of identical information via plural broadcast systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/10—Arrangements for replacing or switching information during the broadcast or the distribution
    • H04H20/106—Receiver-side switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/26—Arrangements for switching distribution systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/55—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for traffic information
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/60—Aspects of broadcast communication characterised in that the receiver comprises more than one tuner
    • 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
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/49—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying locations
    • H04H60/51—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying locations of receiving stations

Definitions

  • PI codes program identification codes
  • This RDS service is particularly useful for mobile radio receivers because changes in location can constantly change the reception conditions.
  • the receiving device In order to supply the radio receiver with the current program without an audible interruption, the receiving device must therefore be able to fall back on alternative frequencies already recognized as worth receiving if the reception conditions within an internal memory deteriorate.
  • the alternative frequencies transmitted by wave propagation with the RDS data are stored in a memory, but also an evaluation of the reception quality of the stored AFs is carried out at least with each change to an alternative frequency.
  • the quality assessment can only be carried out by briefly checking an alternative frequency, ie within a time window of approx. 20 ms including the necessary switchover times to the AF and returning to the currently received frequency to avoid an audible program interruption.
  • the particularly annoying multi-path reception disturbances can hardly be detected because they occur briefly, but have a follow-up time of 100 ms and longer.
  • the receiving device may be tuned to a usable but not the best quality AF. This condition may persist for a long time if the current tuning frequency has just not reached the thresholds for triggering an AF check.
  • An RDS receiver with a single receiver cannot solve the following problem: If the threshold for an AF change is reached, the receiver can only access those AFs whose quality assessment is a priori no longer up-to-date, ie that u. An AF may be set that was the best in the last quality check, but has deteriorated significantly in the meantime without falling below the minimum requirements for reception. A complete check of all AFs that have been useful in the recent past is not possible due to the long interruption of the current program. The user must therefore occasionally accept a multiple AF change, during which the reception quality deteriorates audibly in the meantime.
  • the RDS receiver described in EP application 0 333 194 essentially contains one Data memory which is occupied by a second receiving part with the list of alternative frequencies transmitted via wave propagation in the RDS signal of the currently received program.
  • a selection device uses the second tuner to select those AFs whose signal field strength exceeds a predetermined value and stores them in a selection memory.
  • a comparison device then decides whether the current reception frequency of the first reception section should be exchanged with one of these AFs.
  • the data memory contains the entire AF list of a program broadcast by a broadcaster and, on the other hand, in the case of an abrupt program change by pressing a program selection button, no AFs of the program can provide newly selected programs as long as the associated AF list has not been detected from the RDS signal transmitted via wave propagation.
  • the object of the present invention was therefore to develop a two-receiver concept with a background memory which can immediately offer a number of alternative frequencies which are worth receiving even in the case of a spontaneous program change.
  • the background memory should also reflect the entire transmitter landscape tested for reception quality, which corresponds to the range of action of the mobile receiving device.
  • the alternative frequencies transmitted to the working memory in the case of a spontaneous program call are to be periodically checked in terms of their reception quality and ranked with the aid of the second receiving part in order to be able to switch to a reliable alternative frequency without loss of time even in the case of short-term, striking interferences.
  • the frequency should only be switched after a long period of interference in order to avoid a continuous frequency change.
  • the RF signal received via the antenna is fed to both the tuner 2 of the foreground receiver 1 and the tuner 17 of the background receiver 19 and converted into an intermediate frequency.
  • the low-frequency multiplex signal is available at the output of IF amplifiers 3 and 18 for further processing.
  • the audio signals for the left and right stereo channels are obtained via the stereo decoder 4, which are fed to the power amplifier 5 and the loudspeakers.
  • both the foreground receiver 1 and the background receiver 19 each have a level detector 6 or 14 and a multipath detector 7 or 15.
  • the level detectors receive a measurement variable from the IF amplifiers in accordance with the IF signal level to determine the signal field strength, which is processed in the microprocessor 9 acting as a central control unit.
  • the multipath detectors are fed with the demodulated multiplex signal and supply the microprocessor 9 with a control signal for recognizing multipath reception.
  • the analog / digital conversion of the control signals for the microprocessor 9 takes place either in the detectors 6 and 7 or 14 and 15 or in the microprocessor 9, provided that this is provided with corresponding converter inputs.
  • only the background receiver 19 contains one for evaluating the RDS data RDS decoder 16. A version in which the foreground receiver also has its own RDS decoder is also conceivable.
  • the demodulated multiplex signal is first subjected to 57 kHz bandpass filtering in the RDS decoder 16.
  • the quadrature-amplitude-modulated RDS signal is then demodulated and, after a further biphase and differential decoding, supplied to the microprocessor 9.
  • the microprocessor 9 supplies the tuning signals for the synthesizer tuners 2 and 17 and feeds the display 12, via which i.a.
  • the station names obtained from the PS code (Program Service Name Code) of the RDS signal are displayed alphanumerically.
  • control unit 13 which generates the corresponding commands for the microprocessor 9.
  • the operating program for the microprocessor 9 is stored in the ROM memory 8.
  • the EEPROM memory 10 serves as a non-volatile program memory and, assigned to the program selection buttons in the operating part 13, contains the PI code and the associated PS code for each stored program.
  • the current transmitter data are recorded in the three memory levels of the RAM 11a-c.
  • Memory level 11a represents the main memory and contains, in addition to the PI code and the tuning frequency for the transmitter currently received by the foreground receiver 1, the associated PS code and the alternative frequencies that can be received on site.
  • Memory level 11b forms the background memory, which is loaded via the background receiver 19 with the PI codes and the alternative frequencies of all programs currently or previously confirmed to be worth receiving.
  • the memory level 11c works as an additional memory in which all RDS-TP frequencies, ie all RDS frequencies with Traffic Program Identification (TP), which originate from the same broadcaster which broadcasts the program received by the foreground receiver 1, are stored.
  • TP Traffic Program Identification
  • the microprocessor 9 starts tuning the tuner 17 in the search run over the entire reception range from 87.5 to 108.0 MHz, whereby it uses the level detector 14 and the multi-path detector 15 to check whether certain minimum values for the reception quality are met.
  • the microprocessor 9 uses the RDS demodulator 16 to determine whether the received frequency is an RDS transmission frequency with or without traffic information, and stores frequencies that are worth receiving, sorted according to PI codes and evaluated in the order of their reception quality in the background memory 11b.
  • the microprocessor 9 then transmits the data of the transmitter with the highest field strength including the associated AFs automatically into the first memory level 11a of the RAM, which serves as a working memory, and supplies a transmitter-related tuning signal to the tuner 2 of the foreground receiver 1.
  • the microprocessor 9 periodically checks the reception quality of the AFs stored in the working memory 11a via the background receiver 19 and continuously updates their ranking. In between at certain intervals, the microprocessor 9 uses the background receiver 19 to repeat its automatic search over the entire reception frequency range and empirically extends the memory content of the background memory 11b in accordance with the changed reception conditions in the case of mobile radio reception, the evaluation of the reception quality in the order of the local conditions is adjusted in each case. As a result, the background memory 11b reflects the transmitter landscape in the action area of the mobile radio receiver over time.
  • the frequencies of the PI code that has not been transferred to the working memory 11a for a long time for tuning the foreground receiver 1 are automatically deleted.
  • the transmission of a new PI code together with the associated AFs and thus a new program into the working memory 11a can take place when the receiving device is switched on in such a way that the background memory 11b is manually read out step by step in a special query mode by actuating a correspondingly labeled key, the Code-associated frequency data can be copied into the working memory 11a. The old data of the working memory will be deleted. As soon as the foreground receiver 1 recognizes the PS code from the RDS data transmitted via wave propagation in reception mode, the associated transmitter name is shown on the display 12 and the PS code is additionally stored in the working memory 11a.
  • Program data which should also be available spontaneously in the future, can be transferred to the program memory 10 by pressing an appropriate program selection key.
  • the microprocessor 9 only transfers the PI code and the PS code from the working memory 11a to the program memory 10.
  • the AFs which can currently be received are copied from the background memory 11b to the working memory 11a when the program is called up later spontaneously, and with the help of the PS code, the station name can be displayed immediately without waiting for the evaluation of the RDS data received via wave propagation.
  • the PS code subsequently obtained from the radio signal shows a difference the code stored in the program memory 10, e.g. B. because the station name has been changed in the meantime, the PS code assigned to a specific PI code is automatically corrected by the microprocessor 9 both in the working memory 11a and in the program memory 10.
  • the background receiver 19 can be activated for a short time after extended switch-off pauses when the audio mode is switched off, time-controlled by the microprocessor 9 which is fed in the standby mode.
  • the foreground receiver 1 can be tuned to a new frequency by pressing a corresponding program selection key, or a manual search can be carried out step by step using special up / down search keys. Since in the exemplary embodiment described, only the background receiver 19 has an RDS demodulator 16, the search must take place via the background receiver.
  • the search stops at a reception frequency worth receiving the RDS or RDS-TP signals can be decoded within 300 ms, for example, and z. B. within max. Identify with a valid PI code for 1 s.
  • This frequency is transmitted from microprocessor 9 to work memory 11a for tuning foreground receiver 1 and thus for program presentation, the current AF list for the associated PI code in background memory 11b also being automatically copied into work memory 11a. If the associated PI code is also already stored in the program memory 10 together with the corresponding PS code, the PS code is also copied from there into the working memory 11a by the microprocessor 9 in order to be able to immediately display the station name in the display 12.
  • the memory content is then updated with regard to the reception quality in the manner described above.
  • the continuous checking of the reception quality in the background receiver 19 parallel to the reproduction of the currently received program in the foreground receiver 1 would initially also have a brief and minor one Changes in the reception conditions result in a frequent change of the foreground receiver 1 to an alternative frequency.
  • the switch to an alternative frequency is software-controlled in the device according to the invention such that, with a slightly better reception quality of an AF, a frequency change only after a longer exposure and with strong ones Differences in quality occur within a very short period of time.
  • the delay time for a frequency change is switched over in stages depending on the reception field strength and the size of the detection signal for multipath reception.
  • designs with a constant delay or exposure time without signal dependence are also obvious.
  • the foreground receiver 1 can be tuned to an RDS transmission frequency without traffic reports, while traffic reports on other transmission frequencies of the same broadcaster are monitored with the background receiver 19.
  • the invention is therefore based on the idea that the driver with the foreground receiver selects the program of a broadcaster within his current target area and that by monitoring a traffic program of the same broadcaster in the background receiver, he only receives traffic information that is relevant to his route.
  • the PI code consists of four hexadecimal numbers of 4 bits each, the first HEX number (bits 1 to 4) representing the country code and the second HEX number (bits 5 to 8) representing the transmission area code, ie the second HEX number indicates whether the program is international, national, supraregional, regional or local.
  • the third and fourth HEX numbers (bits 9 to 16) form the program reference number and thus identify the respective programs of the various broadcasters in a country. In Germany, the third HEX number is the program area (e.g. Bavaria, Hesse etc.) and the fourth HEX number is the program code (e.g. 1st program, 2nd program etc.).
  • the microprocessor 9 uses the background receiver 19 to check whether the TP bit in the RDS data signal is set to 1, i.e. whether it is, by briefly tuning the tuner 17 is a traffic information station, otherwise there is no frequency transfer.
  • the traffic radio frequencies stored in the additional memory 11c are periodically checked by the microprocessor 9 alternately with the frequencies stored in the working memory 11a for reception quality and sorted according to their ranking.
  • TA traffic announcement

Abstract

When the receiving conditions deteriorate, RDS broadcast receivers having only one receiving section must use alternative frequencies, the quality assessment of which is no longer current at the time of switch-over. To circumvent the manifold disadvantages of the single-receiver concept, an RDS broadcast receiver having two receiving sections is described which continuously monitors the receiving quality of alternative frequencies with the aid of a background receiver and empirically builds up in a background memory a list of suitable RDS receiving frequencies, ordered in accordance with receiving quality, with and without traffic announcements from the field of action of the mobile receiver. When an RDS broadcast programme without traffic messages is received, traffic announcements on other frequencies of the same transmitting station can be automatically inserted. <IMAGE>

Description

Mit dem Radio-Daten-System (RDS) wird parallel zum ausgestrahlten Rundfunkprogramm, unhörbar für den Rundfunkhörer, ein binärer Datenstrom übertragen, der dem Empfangsgerät eine Reihe von Abstimm-, Schalt- und Betriebsinformationen liefert. Unter anderem werden z.B. als Abstimmhilfe fortlaufend sogenannte PI-Codes (Programme Identification Codes) gesendet, die dem Empfänger die Zuordnung einer Senderfrequenz zu einer bestimmten Programmkette erlauben und ihm alternative Frequenzen anbieten, mit denen das gleiche Programm empfangen werden kann. Dieser RDS-Service ist vor allem für mobile Rundfunkempfänger nützlich, weil sich durch Ortsveränderungen die Empfangsverhältnisse ständig ändern können.With the radio data system (RDS), a binary data stream is transmitted parallel to the broadcast radio program, inaudible to the radio listener, which provides the receiver with a range of tuning, switching and operating information. Among other things, so-called PI codes (program identification codes) are continuously sent as tuning aids, which allow the receiver to assign a transmitter frequency to a specific program chain and offer him alternative frequencies with which the same program can be received. This RDS service is particularly useful for mobile radio receivers because changes in location can constantly change the reception conditions.

Die Übertragung der alternativen Frequenzen (AF) vom Sender zum Empfänger über Wellenausbreitung kann aber im Grenzfall bis zu zwei Minuten dauern (störungsfreier Empfang vorausgesetzt), da die AFs in Form von Listen sequentiell übermittelt werden. Die Organisation dieser Listen, für die es zwei Versionen A und B gibt, ist in der Spezifikation des Radio-Daten-Systems, DIN/pr. EN 50 067 vom Oktober 1988 ausführlich beschrieben und soll hier nicht näher erläutert werden.The transmission of the alternative frequencies (AF) from the transmitter to the receiver via wave propagation can, however, take up to two minutes in the borderline case (interference-free reception provided), since the AFs are transmitted sequentially in the form of lists. The organization of these lists, for which there are two versions A and B, is in the specification of the radio data system, DIN / pr. EN 50 067 from October 1988 is described in detail and will not be explained here.

Um den Rundfunkhörer ohne hörbare Unterbrechung mit dem laufenden Programm zu versorgen, muß das Empfangsgerät deshalb bei Verschlechterung der Empfangsverhältnisse innerhalb eines internen Speichers auf bereits als empfangswürdig erkannte alternative Frequenzen zurückgreifen können. Nach dem Stand der Technik werden dazu nicht nur die per Wellenausbreitung mit den RDS-Daten übertragenen alternativen Frequenzen in einem Speicher abgelegt, sondern es wird auch zumindest bei jedem Wechsel auf eine alternative Frequenz eine Bewertung der Empfangsqualität der abgespeicherten AFs vorgenommen.In order to supply the radio receiver with the current program without an audible interruption, the receiving device must therefore be able to fall back on alternative frequencies already recognized as worth receiving if the reception conditions within an internal memory deteriorate. According to the prior art, not only the alternative frequencies transmitted by wave propagation with the RDS data are stored in a memory, but also an evaluation of the reception quality of the stored AFs is carried out at least with each change to an alternative frequency.

Bei Rundfunkempfängern mit einem einzigen Tuner kann die Qualitätsbewertung jedoch nur durch kurzzeitiges Aufprüfen einer alternativen Frequenz, d.h. innerhalb eines Zeitfensters von ca. 20 ms einschließlich der notwendigen Umschaltzeiten auf die AF und dem Zurückspringen auf die aktuell empfangene Frequenz erfolgen, um keine hörbare Programmunterbrechung zu erzeugen. Die besonders lästigen Mehrwegeempfangsstörungen sind dabei kaum detektierbar, weil diese zwar kurzzeitig auftreten, aber eine Folgezeit von 100 ms und größer aufweisen. Als Folge davon kann es vorkommen, daß das Empfangsgerät auf eine brauchbare, aber nicht auf die qualitativ beste AF abgestimmt ist. Dieser Zustand kann längere Zeit andauern, wenn die aktuelle Abstimmfrequenz gerade noch nicht die Schwellen für das Auslösen einer AF-Überprüfung erreicht.In the case of radio receivers with a single tuner, however, the quality assessment can only be carried out by briefly checking an alternative frequency, ie within a time window of approx. 20 ms including the necessary switchover times to the AF and returning to the currently received frequency to avoid an audible program interruption. The particularly annoying multi-path reception disturbances can hardly be detected because they occur briefly, but have a follow-up time of 100 ms and longer. As a result, the receiving device may be tuned to a usable but not the best quality AF. This condition may persist for a long time if the current tuning frequency has just not reached the thresholds for triggering an AF check.

Ein RDS-Empfänger mit einem einzigen Empfangsteil kann außerdem folgendes Problem nicht lösen:
Wird die Schwelle für einen AF-Wechsel erreicht, so kann der Empfänger nur auf solche AFs zurückgreifen, deren Qualitätsbeurteilung a priori nicht mehr aktuell ist, d. h., daß u. U. eine AF eingestellt wird, die bei der letzten Qualitätsüberprüfung die beste war, sich in der Zwischenzeit aber deutlich verschlechtert hat, ohne die Mindestanforderungen an die Empfangswürdigkeit zu unterschreiten. Eine vollständige Überprüfung sämtlicher AFs, die in jüngerer Vergangenheit brauchbar waren, verbietet sich wegen der längeren Unterbrechung des laufenden Programms. Der Benutzer muß deshalb gelegentlich einen mehrfachen AF-Wechsel in Kauf nehmen, bei dem sich zwischendurch die Empfangsqualität hörbar verschlechtert.An RDS receiver with a single receiver cannot solve the following problem:
If the threshold for an AF change is reached, the receiver can only access those AFs whose quality assessment is a priori no longer up-to-date, ie that u. An AF may be set that was the best in the last quality check, but has deteriorated significantly in the meantime without falling below the minimum requirements for reception. A complete check of all AFs that have been useful in the recent past is not possible due to the long interruption of the current program. The user must therefore occasionally accept a multiple AF change, during which the reception quality deteriorates audibly in the meantime.

Unter günstigen Empfangsbedingungen macht sich bei einem Ein-Empfänger-Konzept ein weiterer Zielkonflikt bemerkbar:
Da sich unter günstigen topographischen Voraussetzungen die Empfangssituation im mobilen Betrieb nur langsam ändert, kann unter guten Empfangsbedingungen der Empfänger sehr lange an einer Abstimmfrequenz festhalten, obwohl eine alternative Frequenz inzwischen mit besserer Qualität zu empfangen wäre. Erst wenn die Qualitätsschwelle unterschritten wird, erfolgt die Umschaltung auf eine AF und erzeugt dabei u. U. einen hörbaren Qualitätssprung (z.B. von leicht gestörtem Monoempfang zu gutem Stereoempfang).Under favorable reception conditions, there is another conflict of objectives with a one-recipient concept:
Since the reception situation in mobile operation changes only slowly under favorable topographical conditions, the receiver can hold on to a tuning frequency for a very long time under good reception conditions, although an alternative frequency could now be received with better quality. Only when the quality threshold is undershot is the switchover to an AF and, in the process, generates u. U. an audible leap in quality (e.g. from slightly disturbed mono reception to good stereo reception).

Um diese vielfältigen Einschränkungen bei der Nutzung des Radio-Daten-Systems im mobilen Empfangsbetrieb zu umgehen, ist es nach dem Stand der Technik bekannt, einen RDS-Empfänger mit einem zweiten Empfangsteil auszurüsten, das im Hintergrund fortlaufend nach empfangswürdigen alternativen Frequenzen sucht. Ein Empfänger dieser Art ist in der EP-Anmeldung 0 333 194 beschrieben. Weitere Offenlegungen über Empfänger mit zwei Empfangsteilen, jedoch nicht speziell ausgelegt auf das Radio-Daten-System, finden sich in der DE-OS 28 40 533, der DE-OS 30 20 135 und der EP-Anmeldung 0 036 086.In order to circumvent these various restrictions when using the radio data system in mobile reception mode, it is known in the prior art to equip an RDS receiver with a second receiving part, which continuously searches for alternative frequencies that are worth receiving in the background. A receiver of this type is described in EP application 0 333 194. Further disclosures on receivers with two receiving parts, but not specifically designed for the radio data system, can be found in DE-OS 28 40 533, DE-OS 30 20 135 and EP application 0 036 086.

Der in der EP-Anmeldung 0 333 194 beschriebene RDS-Empfänger enthält im wesentlichen einen Datenspeicher, der von einem zweiten Empfangsteil mit der über Wellenausbreitung im RDS-Signal des aktuell empfangenen Programms übertragenen Liste alternativer Frequenzen belegt wird. Eine Auswahleinrichtung sucht mit Hilfe des zweiten Tuners diejenigen AFs aus, deren Signalfeldstärke einen vorgegebenen Wert übertrifft und legt diese in einem Auswahlspeicher ab. Eine Vergleichseinrichtung entscheidet dann, ob die aktuelle Empfangsfrequenz des ersten Empfangsteils mit einer dieser AFs ausgetauscht werden soll.The RDS receiver described in EP application 0 333 194 essentially contains one Data memory which is occupied by a second receiving part with the list of alternative frequencies transmitted via wave propagation in the RDS signal of the currently received program. A selection device uses the second tuner to select those AFs whose signal field strength exceeds a predetermined value and stores them in a selection memory. A comparison device then decides whether the current reception frequency of the first reception section should be exchanged with one of these AFs.

Der Nachteil dieser Anordnung besteht darin, daß der Datenspeicher zum einen ohne Rücksicht auf die vor Ort wirklich empfangbaren alternativen Frequenzen die gesamte, von einer Sendeanstalt ausgestrahlte AF-Liste eines Programms enthält und zum anderen bei einem abruptem Programmwechsel durch Betätigen einer Programmwahltaste zunächst keine AFs des neu gewählten Programms zur Verfügung stellen kann, solange nicht die zugehörige AF-Liste aus dem über Wellenausbreitung übertragenen RDS-Signal detektiert wurde.The disadvantage of this arrangement is that, regardless of the alternative frequencies that can actually be received on site, the data memory contains the entire AF list of a program broadcast by a broadcaster and, on the other hand, in the case of an abrupt program change by pressing a program selection button, no AFs of the program can provide newly selected programs as long as the associated AF list has not been detected from the RDS signal transmitted via wave propagation.

Aufgabe der vorliegenden Erfindung war es deshalb, ein Zweiempfängerkonzept mit einem Hintergrundspeicher zu entwickeln, der auch bei einem spontanen Programmwechsel sofort eine Anzahl empfangswürdiger alternativer Frequenzen anbieten kann. Ferner soll der Hintergrundspeicher im Laufe der Zeit die gesamte, auf Empfangsqualität getestete Senderlandschaft widerspiegeln, die dem Aktionsradius des mobilen Empfangsgerätes entspricht.The object of the present invention was therefore to develop a two-receiver concept with a background memory which can immediately offer a number of alternative frequencies which are worth receiving even in the case of a spontaneous program change. In the course of time, the background memory should also reflect the entire transmitter landscape tested for reception quality, which corresponds to the range of action of the mobile receiving device.

Die bei einem spontanen Programmabruf in den Arbeitsspeicher übertragenen alternativen Frequenzen sollen gemäß der Erfindung mit Hilfe des zweiten Empfangsteils periodisch in ihrer Empfangsqualität überprüft und rangmäßig geordnet werden, um auch bei kurzzeitig auftretenden, markanten Störungen ohne Zeitverlust auf eine empfangssichere alternative Frequenz umschalten zu können. Bei geringfügigen Störungen soll jedoch die Frequenzumschaltung erst nach längerer Störeinwirkung erfolgen, um einen fortlaufenden Frequenzwechsel zu vermeiden.According to the invention, the alternative frequencies transmitted to the working memory in the case of a spontaneous program call are to be periodically checked in terms of their reception quality and ranked with the aid of the second receiving part in order to be able to switch to a reliable alternative frequency without loss of time even in the case of short-term, striking interferences. In the case of minor disturbances, however, the frequency should only be switched after a long period of interference in order to avoid a continuous frequency change.

Ein weiteres Ziel der Erfindung war es, den RDS-Rundfunkempfänger derart zu gestalten, daß beim Empfang eines Senders ohne Verkehrsmeldungen der Hintergrundempfänger sämtliche Verkehrsfunkfrequenzen derselben Sendeanstalt überwacht und beim Verbreiten einer Verkehrsmeldung nur während der Dauer der Verkehrsdurchsage (TA-Bit = 1) den Vordergrundempfänger auf die empfangswürdigste Verkehrsfunkfrequenz der für den aktuellen Empfangsort zuständigen Sendeanstalt abstimmt.Another object of the invention was to design the RDS radio receiver in such a way that when a station is received without traffic reports, the background receiver monitors all traffic radio frequencies of the same broadcaster and, when a traffic report is broadcast, only the foreground receiver for the duration of the traffic announcement (TA bit = 1) tunes to the most receivable traffic radio frequency of the broadcaster responsible for the current location.

Die Erfindung wird nun nachfolgend anhand der Zeichnungen erläutert. Es zeigen:

Fig. 1
das Blockschaltbild für ein Ausführungsbeispiel des erfindungsgemäßen RDS-Rundfunkempfängers
Fig. 2
das Strukturschema des PI-Codes.
The invention will now be explained with reference to the drawings. Show it:
Fig. 1
the block diagram for an embodiment of the RDS radio receiver according to the invention
Fig. 2
the structural scheme of the PI code.

Bei dem in Fig. 1 dargestellten Rundfunkempfänger wird das über die Antenne empfangene HF-Signal sowohl dem Tuner 2 des Vordergrundempfängers 1 als auch dem Tuner 17 des Hintergrundempfängers 19 zugeführt und in eine Zwischenfrequenz umgesetzt. Nach selektiver Verstärkung und Demodulation steht das niederfrequente Multiplexsignal am Ausgang der ZF-Verstärker 3 und 18 zur Weiterverarbeitung zur Verfügung. Aus dem Signal des Vordergrundempfängers 1 werden über den Stereo-Decoder 4 die Audiosignale für den linken und rechten Stereokanal gewonnen, die dem Endverstärker 5 und den Lautsprechern zugeleitet werden. Zur Beurteilung der Empfangsqualität besitzen sowohl der Vordergrundempfänger 1 als auch der Hintergrundempfänger 19 je einen Pegeldetektor 6 bzw. 14 und einen Mehrwegedetektor 7 bzw. 15. Die Pegeldetektoren erhalten von den ZF-Verstärkern nach Maßgabe des ZF-Signalpegels eine Meßgröße zur Feststellung der Signalfeldstärke, die in dem als zentrale Steuereinheit wirkenden Mikroprozessor 9 verarbeitet wird. Die Mehrwegedetektoren werden mit dem demodulierten Multiplexsignal gespeist und liefern dem Mikroprozessor 9 ein Steuersignal zum Erkennen von Mehrwegeempfang. Die Analog-/Digitalwandlung der Steuersignale für den Mikroprozessor 9 erfolgt entweder in den Detektoren 6 und 7 bzw. 14 und 15 oder im Mikroprozessor 9, sofern dieser mit entsprechenden Wandlereingängen versehen ist. Zur Auswertung der RDS-Daten enthält in dem gezeigten Ausführungsbeispiel nur der Hintergrundempfänger 19 einen RDS-Decoder 16. Eine Version, in der auch der Vordergrundempfänger einen eigenen RDS-Decoder aufweist, ist ebenfalls denkbar.In the radio receiver shown in FIG. 1, the RF signal received via the antenna is fed to both the tuner 2 of the foreground receiver 1 and the tuner 17 of the background receiver 19 and converted into an intermediate frequency. After selective amplification and demodulation, the low-frequency multiplex signal is available at the output of IF amplifiers 3 and 18 for further processing. From the signal of the foreground receiver 1, the audio signals for the left and right stereo channels are obtained via the stereo decoder 4, which are fed to the power amplifier 5 and the loudspeakers. To assess the reception quality, both the foreground receiver 1 and the background receiver 19 each have a level detector 6 or 14 and a multipath detector 7 or 15. The level detectors receive a measurement variable from the IF amplifiers in accordance with the IF signal level to determine the signal field strength, which is processed in the microprocessor 9 acting as a central control unit. The multipath detectors are fed with the demodulated multiplex signal and supply the microprocessor 9 with a control signal for recognizing multipath reception. The analog / digital conversion of the control signals for the microprocessor 9 takes place either in the detectors 6 and 7 or 14 and 15 or in the microprocessor 9, provided that this is provided with corresponding converter inputs. In the exemplary embodiment shown, only the background receiver 19 contains one for evaluating the RDS data RDS decoder 16. A version in which the foreground receiver also has its own RDS decoder is also conceivable.

Das demodulierte Multiplexsignal wird im RDS-Decoder 16 zunächst einer 57 kHz-Bandpaßfilterung unterzogen. Danach wird das in Quadratur amplitudenmodulierte RDS-Signal demoduliert und nach einer weiteren Biphase- und Differential-Decodierung dem Mikroprozessor 9 zugeführt. Der Mikroprozessor 9 liefert die Abstimmsignale für die Synthesizer Tuner 2 und 17 und speist das Display 12, über das u.a. die aus dem PS-Code (Programm Service Name Code) des RDS-Signals gewonnenen Sendernamen alphanumerisch angezeigt werden.The demodulated multiplex signal is first subjected to 57 kHz bandpass filtering in the RDS decoder 16. The quadrature-amplitude-modulated RDS signal is then demodulated and, after a further biphase and differential decoding, supplied to the microprocessor 9. The microprocessor 9 supplies the tuning signals for the synthesizer tuners 2 and 17 and feeds the display 12, via which i.a. The station names obtained from the PS code (Program Service Name Code) of the RDS signal are displayed alphanumerically.

Sämtliche manuellen Bedienfunktionen werden vom Bedienteil 13 gesteuert, das die entsprechenden Befehle für den Mikroprozessor 9 erzeugt.All manual control functions are controlled by the control unit 13, which generates the corresponding commands for the microprocessor 9.

Das Betriebsprogramm für den Mikroprozessor 9 ist im ROM-Speicher 8 abgelegt. Der EEPROM-Speicher 10 dient als nichtflüchtiger Programmspeicher und beinhaltet, zugeordnet zu den Programmwahltasten im Bedienteil 13, für jedes abgespeicherte Programm den PI-Code und den zugehörigen PS-Code. In den drei Speicherebenen des RAM-Speichers 11a-c werden die aktuellen Senderdaten festgehalten. Speicherebene 11a stellt den Arbeitsspeicher dar und enthält neben dem PI-Code und der Abstimmfrequenz für den vom Vordergrundempfänger 1 aktuell empfangenen Sender den zugehörigen PS-Code und die vor Ort empfangbaren alternativen Frequenzen. Speicherebene 11b bildet den Hintergrundspeicher, der über den Hintergrundempfänger 19 mit den PI-Codes und den alternativen Frequenzen sämtlicher derzeit oder vormals als empfangswürdig bestätigter Programme geladen wird. Die Speicherebene 11c arbeitet als Zusatzspeicher, in den alle RDS-TP-Frequenzen, d.h. alle RDS-Frequenzen mit Traffic Programme Identification (TP) abgelegt werden, die von derselben Sendeanstalt stammen, welche das vom Vordergrundempfänger 1 empfangene Programm ausstrahlt.The operating program for the microprocessor 9 is stored in the ROM memory 8. The EEPROM memory 10 serves as a non-volatile program memory and, assigned to the program selection buttons in the operating part 13, contains the PI code and the associated PS code for each stored program. The current transmitter data are recorded in the three memory levels of the RAM 11a-c. Memory level 11a represents the main memory and contains, in addition to the PI code and the tuning frequency for the transmitter currently received by the foreground receiver 1, the associated PS code and the alternative frequencies that can be received on site. Memory level 11b forms the background memory, which is loaded via the background receiver 19 with the PI codes and the alternative frequencies of all programs currently or previously confirmed to be worth receiving. The memory level 11c works as an additional memory in which all RDS-TP frequencies, ie all RDS frequencies with Traffic Program Identification (TP), which originate from the same broadcaster which broadcasts the program received by the foreground receiver 1, are stored.

Sobald das Empfangsgerät erstmalig an die Spannungsversorgung angeschlossen wird (oder in abgewandelter Ausführung, sobald der Rundfunkempfänger zum ersten Male eingeschaltet wird), beginnt der Mikroprozessor 9 den Tuner 17 im Suchlauf über den gesamten Empfangsbereich von 87,5 bis 108,0 MHz durchzustimmen, wobei er über den Pegeldetektor 14 und den Mehrwegedetektor 15 prüft, ob bestimmte Mindestwerte für die Empfangsqualität erfüllt werden. Gleichzeitig ermittelt der Mikroprozessor 9 über den RDS-Demodulator 16, ob es sich bei der empfangenen Frequenz um eine RDS-Sendefrequenz mit oder ohne Verkehrsfunkausstrahlung handelt, und speichert empfangswürdige Frequenzen, geordnet nach PI-Codes und bewertet in der Rangfolge entsprechend ihrer Empfangsqualität im Hintergrundspeicher 11b ab. Die Daten des Senders mit der höchsten Feldstärke samt zugehöriger AFs überträgt der Mikroprozessor 9 anschließend automatisch in die als Arbeitsspeicher dienende erste Speicherebene 11a des RAM-Speichers und liefert ein senderbezogenes Abstimmsignal an den Tuner 2 des Vordergrundempfängers 1.As soon as the receiving device is connected to the power supply for the first time (or in a modified version as soon as the radio receiver is switched on for the first time), the microprocessor 9 starts tuning the tuner 17 in the search run over the entire reception range from 87.5 to 108.0 MHz, whereby it uses the level detector 14 and the multi-path detector 15 to check whether certain minimum values for the reception quality are met. At the same time, the microprocessor 9 uses the RDS demodulator 16 to determine whether the received frequency is an RDS transmission frequency with or without traffic information, and stores frequencies that are worth receiving, sorted according to PI codes and evaluated in the order of their reception quality in the background memory 11b. The microprocessor 9 then transmits the data of the transmitter with the highest field strength including the associated AFs automatically into the first memory level 11a of the RAM, which serves as a working memory, and supplies a transmitter-related tuning signal to the tuner 2 of the foreground receiver 1.

Unabhängig davon, ob das Empfangsgerät zur Rundfunkwiedergabe ein- oder ausgeschaltet ist, prüft der Mikroprozessor 9 periodisch über den Hintergrundempfänger 19 die Empfangsqualität der im Arbeitsspeicher 11a abgelegten AFs und aktualisiert fortlaufend deren Rangfolge. Zwischendurch in bestimmten Zeitabständen wiederholt der Mikroprozessor 9 mit Hilfe des Hintergrundempfängers 19 seinen automatischen Suchlauf über den gesamten Empfangs-Frequenzbereich und weitet empirisch den Speicherinhalt des Hintergrundspeichers 11b gemäß den veränderten Empfangsbedingungen bei mobilen Rundfunkempfang aus, wobei die Bewertung der Empfangsqualität in der Rangfolge den örtlichen Verhältnissen jeweils angepaßt wird. Dadurch spiegelt der Hintergrundspeicher 11b im Laufe der Zeit die Senderlandschaft im Aktionsgebiet des mobilen Rundfunkempfängers wider.Regardless of whether the receiver for radio reproduction is switched on or off, the microprocessor 9 periodically checks the reception quality of the AFs stored in the working memory 11a via the background receiver 19 and continuously updates their ranking. In between at certain intervals, the microprocessor 9 uses the background receiver 19 to repeat its automatic search over the entire reception frequency range and empirically extends the memory content of the background memory 11b in accordance with the changed reception conditions in the case of mobile radio reception, the evaluation of the reception quality in the order of the local conditions is adjusted in each case. As a result, the background memory 11b reflects the transmitter landscape in the action area of the mobile radio receiver over time.

Werden die Grenzen der Speicherkapazität des Hintergrundspeichers 11b erreicht, so werden die Frequenzen desjenigen PI-Codes automatisch gelöscht, der für lange Zeit nicht zur Abstimmung des Vordergrundempfänges 1 in den Arbeitsspeicher 11a übertragen wurde.If the limits of the storage capacity of the background memory 11b are reached, the frequencies of the PI code that has not been transferred to the working memory 11a for a long time for tuning the foreground receiver 1 are automatically deleted.

Das Übertragen eines neuen PI-Codes samt zugehöriger AFs und damit eines neuen Programms in den Arbeitsspeicher 11a kann bei eingeschaltetem Empfangsgerät derart erfolgen, daß der Hintergrundspeicher 11b in einem speziellen Abfragemodus manuell durch Betätigen einer entsprechend gekennzeichneten Taste schrittweise ausgelesen wird, wobei die dem PI-Code zugehörigen Frequenzdaten in den Arbeitsspeicher 11a kopiert werden. Die Altdaten des Arbeitsspeichers werden dabei gelöscht. Sobald im Empfangsbetrieb der Vordergrundempfänger 1 aus den über Wellenausbreitung übermittelten RDS-Daten den PS-Code erkennt, wird der zugehörige Sendername im Display 12 angezeigt und der PS-Code im Arbeitsspeicher 11a zusätzlich abgelegt.The transmission of a new PI code together with the associated AFs and thus a new program into the working memory 11a can take place when the receiving device is switched on in such a way that the background memory 11b is manually read out step by step in a special query mode by actuating a correspondingly labeled key, the Code-associated frequency data can be copied into the working memory 11a. The old data of the working memory will be deleted. As soon as the foreground receiver 1 recognizes the PS code from the RDS data transmitted via wave propagation in reception mode, the associated transmitter name is shown on the display 12 and the PS code is additionally stored in the working memory 11a.

Programmdaten, die auch künftig spontan zum Aufruf zur Verfügung stehen sollen, können durch Betätigen einer entsprechenden Programmwahltaste in den Programmspeicher 10 übernommen werden. Dabei überträgt der Mikroprozessor 9 nur den PI-Code und den PS-Code aus dem Arbeitsspeicher 11a in den Programmspeicher 10. Anhand des gespeicherten PI-Codes werden bei einem späteren spontanen Programmabruf die aktuell empfangbaren AFs aus dem Hintergrundspeicher 11b in den Arbeitsspeicher 11a kopiert, und mit Hilfe des PS-Codes kann sofort der Sendername angezeigt werden, ohne daß die Auswertung der über Wellenausbreitung empfangenen RDS-Daten abgewartet werden muß. Weist jedoch der anschließend aus dem Funksignal gewonnene PS-Code eine Abweichung gegenüber dem im Programmspeicher 10 abgelegten Code auf, z. B. weil zwischenzeitlich der Sendername geändert wurde, so wird der einem bestimmten PI-Code zugeordnete PS-Code sowohl im Arbeitsspeicher 11a als auch im Programmspeicher 10 automatisch vom Mikroprozessor 9 nachträglich korrigiert.Program data, which should also be available spontaneously in the future, can be transferred to the program memory 10 by pressing an appropriate program selection key. The microprocessor 9 only transfers the PI code and the PS code from the working memory 11a to the program memory 10. On the basis of the stored PI code, the AFs which can currently be received are copied from the background memory 11b to the working memory 11a when the program is called up later spontaneously, and with the help of the PS code, the station name can be displayed immediately without waiting for the evaluation of the RDS data received via wave propagation. However, the PS code subsequently obtained from the radio signal shows a difference the code stored in the program memory 10, e.g. B. because the station name has been changed in the meantime, the PS code assigned to a specific PI code is automatically corrected by the microprocessor 9 both in the working memory 11a and in the program memory 10.

Da als Programmspeicher 10 ein nichtflüchtiger Speicher verwendet wird, können die gespeicherten Programmdaten auch bei Unterbrechung der Versorgungsspannung nicht verloren gehen.Since a non-volatile memory is used as the program memory 10, the stored program data cannot be lost even if the supply voltage is interrupted.

Die fortlaufende Überwachung der Empfangsqualität der im Arbeitsspeicher 11a und im Hintergrundspeicher 11b abgelegten Frequenzen, auch bei ausgeschaltetem Empfangsgerät, setzt natürlich eine stromsparende Ausführung des Hintergrundempfänges 19 voraus. Sind diese Voraussetzungen gerätetechnisch nicht gegeben, so kann der Hintergrundempfänger 19 bei ausgeschaltetem Audiobetrieb, zeitgesteuert von dem im Stand-by-Betrieb gespeisten Mikroprozessor 9, nach längeren Abschaltpausen jeweils für kurze Zeit aktiviert werden.The continuous monitoring of the reception quality of the frequencies stored in the working memory 11a and in the background memory 11b, even when the receiving device is switched off, naturally requires a power-saving version of the background receiver 19. If these requirements are not met in terms of device technology, the background receiver 19 can be activated for a short time after extended switch-off pauses when the audio mode is switched off, time-controlled by the microprocessor 9 which is fed in the standby mode.

Zum Empfang eines anderen Programms kann, wie vorstehend beschrieben, der Vordergrundempfänger 1 durch Betätigen einer entsprechenden Programmwahltaste auf eine neue Frequenz abgestimmt werden, oder es kann mit speziellen Aufwärts-/Abwärtssuchlauftasten schrittweise ein manueller Suchlauf durchgeführt werden. Da im beschriebenen Ausführungsbeispiel nur der Hintergrundempfänger 19 einen RDS-Demodulator 16 aufweist, muß der Suchlauf über den Hintergrundempfänger erfolgen.To receive another program, as described above, the foreground receiver 1 can be tuned to a new frequency by pressing a corresponding program selection key, or a manual search can be carried out step by step using special up / down search keys. Since in In the exemplary embodiment described, only the background receiver 19 has an RDS demodulator 16, the search must take place via the background receiver.

Der Suchlauf stoppt bei einer empfangswürdigen Sendefrequenz, deren RDS- bzw. RDS-TP-Signale innerhalb von beispielsweise 300 ms decodierbar sind und sich z. B. innerhalb von max. 1 s durch einen gültigen PI-Code ausweisen. Diese Frequenz wird zur Abstimmung des Vordergrundempfängers 1 und damit zur Programmdarbietung vom Mikroprozessor 9 in den Arbeitsspeicher 11a übertragen, wobei die zum zugehörigen PI-Code im Hintergrundspeicher 11b vorhandene aktuelle AF-Liste automatisch in den Arbeitsspeicher 11a zusätzlich kopiert wird. Ist der zugehörige PI-Code zusammen mit dem entsprechenden PS-Code auch bereits im Programmspeicher 10 abgelegt, so wird der PS-Code vom Mikroprozessor 9 ebenfalls von dort in den Arbeitsspeicher 11a kopiert, um sofort den Sendernamen im Display 12 darstellen zu können.The search stops at a reception frequency worth receiving, the RDS or RDS-TP signals can be decoded within 300 ms, for example, and z. B. within max. Identify with a valid PI code for 1 s. This frequency is transmitted from microprocessor 9 to work memory 11a for tuning foreground receiver 1 and thus for program presentation, the current AF list for the associated PI code in background memory 11b also being automatically copied into work memory 11a. If the associated PI code is also already stored in the program memory 10 together with the corresponding PS code, the PS code is also copied from there into the working memory 11a by the microprocessor 9 in order to be able to immediately display the station name in the display 12.

Die Aktualisierung des Speicherinhaltes im Hinblick auf die Empfangsqualität erfolgt dann in der vorbeschriebenen Weise.The memory content is then updated with regard to the reception quality in the manner described above.

Die fortlaufende Überprüfung der Empfangsqualität im Hintergrundempfänger 19 parallel zur Wiedergabe des aktuell empfangenen Programms im Vordergrundempfänger 1 hätte zunächst auch bei kurzzeitigen und geringfügigen Veränderungen der Empfangsverhältnisse einen häufigen Wechsel des Vordergrundempfängers 1 auf eine alternative Frequenz zur Folge. Da aber ein zu häufiger Frequenzwechsel trotz kurzer Umschaltzeiten auch zu einer negativen Beeinträchtigung der Übertragungsqualität führen kann, wird bei dem erfindungsgemäßen Gerät der Wechsel auf eine alternative Frequenz softwaregesteuert derart verzögert, daß bei geringfügig besserer Empfangsqualität einer AF ein Frequenzwechsel erst nach längerer Einwirkung und bei starken Qualitätsunterschieden innerhalb sehr kurzer Zeitspannen erfolgt. Die Verzögerungszeit für einen Frequenzwechsel wird dabei stufenweise in Abhängigkeit der Empfangsfeldstärke und der Größe des Erkennungssignals für Mehrwegeempfang umgeschaltet. Es sind jedoch auch Ausführungen mit konstanter Verzögerungs- bzw. Einwirkungszeit ohne Signalabhängigkeit naheliegend.The continuous checking of the reception quality in the background receiver 19 parallel to the reproduction of the currently received program in the foreground receiver 1 would initially also have a brief and minor one Changes in the reception conditions result in a frequent change of the foreground receiver 1 to an alternative frequency. However, since too frequent a frequency change despite short switchover times can also lead to a negative impairment of the transmission quality, the switch to an alternative frequency is software-controlled in the device according to the invention such that, with a slightly better reception quality of an AF, a frequency change only after a longer exposure and with strong ones Differences in quality occur within a very short period of time. The delay time for a frequency change is switched over in stages depending on the reception field strength and the size of the detection signal for multipath reception. However, designs with a constant delay or exposure time without signal dependence are also obvious.

In einer weiteren vorteilhaften Ausgestaltung der Erfindung kann der Vordergrundempfänger 1 auf eine RDS-Sendefrequenz ohne Verkehrsmeldungen abgestimmt sein, während Verkehrsmeldungen auf anderen Sendefrequenzen derselben Sendeanstalt mit dem Hintergrundempfänger 19 überwacht werden. Nach dem Stand der Technik ist es zwar bekannt, in einem Autoradio mit zwei Empfangsteilen beim Empfang eines Programms ohne Verkehrsnachrichten (z.B. auch eines Mittelwellenprogramms) den Hintergrundempfänger auf den feldstärkebesten Verkehrsfunksender abzustimmen und bei Verkehrsdurchsagen das Programm des Vordergrundempfängers zugunsten der Verkehrsmeldung zu unterbrechen, doch kann dabei ein Verkehrsfunkprogramm empfangen werden, das für die Reiseroute des Autofahrers ohne Bedeutung ist. Die Erfindung geht deshalb von dem Gedanken aus, daß der Autofahrer mit dem Vordergrundempfänger das Programm einer Sendeanstalt innerhalb seines aktuellen Zielgebietes wählt und daß durch die Überwachung eines Verkehrsfunkprogramms derselben Sendeanstalt im Hintergrundempfänger er nur solche Verkehrshinweise erhält, die für seine Fahrstrecke relevant sind. Zu diesem Zweck überträgt der Mikroprozessor 9, sobald der Vordergrundempfänger 1 auf einen RDS-Sender ohne Verkehrsmeldungen (Traffic Programme (TP)-Bit = 0) abgestimmt wird, sämtliche aktuell verfügbaren Verkehrsfunkfrequenzen derselben Sendeanstalt aus dem Hintergrundspeicher 11b in den Zusatzspeicher 11c. Die Aufschlüsselung der in Frage kommenden Frequenzen erfolgt anhand des PI-Codes. Wie aus Fig. 2 hervorgeht, besteht der PI-Code aus vier Hexadezimalzahlen zu je 4 Bit, wobei die erste HEX-Zahl (Bit 1 bis 4) die Länderkennung und die zweite HEX-Zahl (Bit 5 bis 8) die Sendebereichskennung darstellt, d.h., die zweite HEX-Zahl gibt an, ob es sich um eine internationale, nationale, supraregionale, regionale oder lokale Programmausstrahlung handelt. Die dritte und vierte HEX-Zahl (Bit 9 bis 16) bilden die Programmbezugszahl und kennzeichnen damit die jeweiligen Programme der verschiedenen Rundfunkanstalten eines Landes. In Deutschland soll die dritte HEX-Zahl den Programmbereich (z.B. Bayern, Hessen etc.) und die vierte HEX-Zahl den Programm-Code (z.B. 1. Programm, 2. Programm etc.) ausweisen. Um also einen Verkehrsfunksender derselben Sendeanstalt aufzufinden, müssen mindestens die erste und die dritte HEX-Zahl im PI-Code mit den PI-Code-Daten der vom Vordergrundempfänger 1 empfangenen Frequenz übereinstimmen. Bei der Übernahme der einzelnen Frequenzen aus dem Hintergrundspeicher 11b in den Zusatzspeicher 11c prüft der Mikroprozessor 9 mit Hilfe des Hintergrundempfängers 19 jeweils durch kurzzeitiges Abstimmen des Tuners 17, ob das TP-Bit im RDS-Datensignal auf 1 gesetzt ist, d.h., ob es sich um einen Verkehrsfunksender handelt, andernfalls erfolgt keine Frequenzübernahme.In a further advantageous embodiment of the invention, the foreground receiver 1 can be tuned to an RDS transmission frequency without traffic reports, while traffic reports on other transmission frequencies of the same broadcaster are monitored with the background receiver 19. According to the prior art, it is known to tune the background receiver to the field strength-best traffic radio transmitter in a car radio with two receiving parts when receiving a program without traffic news (for example also a medium wave program) and in the case of traffic announcements the program of the foreground receiver in favor of the Interrupt traffic announcement, but a traffic program can be received that is irrelevant to the route of the driver. The invention is therefore based on the idea that the driver with the foreground receiver selects the program of a broadcaster within his current target area and that by monitoring a traffic program of the same broadcaster in the background receiver, he only receives traffic information that is relevant to his route. For this purpose, the microprocessor 9, as soon as the foreground receiver 1 is tuned to an RDS transmitter without traffic reports (Traffic Program (TP) bit = 0), transmits all currently available traffic radio frequencies of the same broadcaster from the background memory 11b into the additional memory 11c. The frequencies in question are broken down using the PI code. As can be seen from FIG. 2, the PI code consists of four hexadecimal numbers of 4 bits each, the first HEX number (bits 1 to 4) representing the country code and the second HEX number (bits 5 to 8) representing the transmission area code, ie the second HEX number indicates whether the program is international, national, supraregional, regional or local. The third and fourth HEX numbers (bits 9 to 16) form the program reference number and thus identify the respective programs of the various broadcasters in a country. In Germany, the third HEX number is the program area (e.g. Bavaria, Hesse etc.) and the fourth HEX number is the program code (e.g. 1st program, 2nd program etc.). In order to find a traffic radio station from the same broadcaster, at least the first and third HEX numbers in the PI code must match the PI code data of the frequency received by the foreground receiver 1. When the individual frequencies are taken over from the background memory 11b into the additional memory 11c, the microprocessor 9 uses the background receiver 19 to check whether the TP bit in the RDS data signal is set to 1, i.e. whether it is, by briefly tuning the tuner 17 is a traffic information station, otherwise there is no frequency transfer.

Die im Zusatzspeicher 11c abgelegten Verkehrsfunkfrequenzen werden im Wechsel mit den im Arbeitsspeicher 11a abgelegten Frequenzen vom Mikroprozessor 9 periodisch auf Empfangsqualität überprüft und entsprechend ihrer Rangfolge sortiert. Gleichzeitig überwacht der Mikroprozessor 9, ob bei einer der Verkehrsfunkfrequenzen das Traffic Announcement (TA)-Bit = 1 gesetzt wird, d.h., ob die Durchsage einer Verkehrsmeldung angekündigt wird, und stimmt für den Zeitraum einer Verkehrsdurchsage den Vordergrundempfänger 1 auf die empfangsstärkste Verkehrsfunkfrequenz ab.The traffic radio frequencies stored in the additional memory 11c are periodically checked by the microprocessor 9 alternately with the frequencies stored in the working memory 11a for reception quality and sorted according to their ranking. At the same time, the microprocessor 9 monitors whether the traffic announcement (TA) bit = 1 is set at one of the traffic radio frequencies, i.e. whether the announcement of a traffic announcement is announced, and tunes the foreground receiver 1 to the strongest traffic radio frequency for the period of a traffic announcement.

Claims (7)

RDS-Rundfunkempfänger, insbesondere RDS-Autoradio mit einem ersten Empfangsteil (Vordergrundempfänger), einem zweiten Empfangsteil (Hintergrundempfänger) und einer zentralen Steuereinheit, dadurch gekennzeichnet, daß die zentrale Steuereinheit (9) a) den Tuner (17) des Hintergrundempfängers (19) periodisch auf die im Arbeitsspeicher (11a) abgelegten alternativen Frequenzen des vom Vordergrundempfänger (1) aktuell empfangenen Programms abstimmt, die Empfangsqualität der alternativen Frequenzen in ihrer Rangfolge untereinander und im Vergleich zur aktuell empfangenen Frequenz bewertet und bei höherer Empfangswürdigkeit einer alternativen Frequenz den Tuner (2) des Vordergrundempfängers (1) auf diese Frequenz einstellt, b) nach bestimmten Zeitabschnitten im Time-Sharing den Tuner (17) des Hintergrundempfängers (19) auf alle decodierbaren RDS- bzw. RDS-TP-Sendefrequenzen nacheinander abstimmt und diese, sofern sie gewisse Mindestanforderungen an die Empfangsqualität erfüllen, geordnet nach PI-Code und Empfangsqualität in einem Hintergrundspeicher (11b) ablegt und c) den Hintergrundspeicher (11b) derart verwaltet, daß Frequenzen, deren PI-Code über längeren Zeitraum nicht zur Abstimmung des Vordergrundempfängers (1) aufgerufen wurde, bei Vollauslastung der Speicherkapazität als erste wieder gelöscht werden. RDS radio receiver, in particular RDS car radio with a first receiving part (foreground receiver), a second receiving part (background receiver) and a central control unit, characterized in that the central control unit (9) a) periodically tunes the tuner (17) of the background receiver (19) to the alternative frequencies stored in the working memory (11a) of the program currently received by the foreground receiver (1), the reception quality of the alternative frequencies in their order of priority and in comparison to the currently received frequency evaluates and adjusts the tuner (2) of the foreground receiver (1) to this frequency if an alternative frequency is more worth receiving, b) after certain periods of time in time sharing, tunes the tuner (17) of the background receiver (19) to all decodable RDS or RDS-TP transmission frequencies one after the other and, provided that they meet certain minimum requirements for the reception quality, arranged according to PI code and stores reception quality in a background memory (11b) and c) the background memory (11b) is managed in such a way that frequencies whose PI code has not been called up for a long period of time to tune the foreground receiver (1) are deleted first when the memory capacity is fully utilized. RDS-Rundfunkempfänger nach Anspruch 1, dadurch gekennzeichnet, daß die Überprüfung der alternativen Frequenzen im Arbeitsspeicher (11a) auf Empfangswürdigkeit und die Bewertung der Empfangsqualität der im Hintergrundspeicher (11b) abgelegten RDS- bzw. RDS-TP-Frequenzen durch den Hintergrundempfänger (19) sowohl bei ein- als auch bei ausgeschalteter Audiowiedergabe erfolgt.RDS radio receiver according to Claim 1, characterized in that the background receiver (19) checks the alternative frequencies in the working memory (11a) for reception worthiness and evaluates the reception quality of the RDS or RDS-TP frequencies stored in the background memory (11b). both when audio playback is switched on and off. RDS-Rundfunkempfänger nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die zentrale Steuereinheit (9) bei Sendersuchlauf den Tuner (17) des Hintergrundempfängers (19) durchstimmt und die bei einem Suchlaufstop als empfangswürdig erkannte RDS- bzw. RDS-TP-Frequenz zur Abstimmung des Vordergrundempfängers(1) in den Arbeitsspeicher (11a) überträgt.RDS radio receiver according to Claim 1 or 2, characterized in that the central control unit (9) tunes the tuner (17) of the background receiver (19) during a search for a station and the RDS or RDS-TP frequency recognized as worth receiving during a search stop Coordination of the foreground receiver (1) in the working memory (11a) transfers. RDS-Rundfunkempfänger nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die zentrale Steuereinheit (9) beim Abstimmen des Vordergrundempfängers (1) auf ein anderes Programm durch spontanen Abruf eines neuen PI-Codes aus dem Programmspeicher (10) mit Hilfe einer Programmwahltaste oder durch Übernahme einer neuen Empfangsfrequenz aus dem Hintergrundempfänger (19) nach Sendersuchlauf die dem zugehörigen PI-Code entsprechende aktuelle AF-Liste aus dem Hintergrundspeicher (11b) in den Arbeitsspeicher (11a) überträgt.RDS radio receiver according to one of the preceding claims, characterized in that the central control unit (9) when tuning the foreground receiver (1) to another program by spontaneously calling up a new PI code from the program memory (10) using a program selection key or Transfer of a new reception frequency from the background receiver (19) after the station search, transmits the current AF list corresponding to the associated PI code from the background memory (11b) to the main memory (11a). RDS-Rundfunkempfänger nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß im Programmspeicher (10) für die den Programmwahltasten zugeordneten Programme jeweils nur der PI-Code und der PS-Code abgespeichert ist und daß die zentrale Steuereinheit (9) bei Sendersuchlauf prüft, ob für die vom Hintergrundempfänger (19) gefundene Empfangsfrequenz ein ihrem PI-Code zugehöriger PS-Code bereits im Programmspeicher (10) abgelegt ist, der zur sofortigen Anzeige des Sendernamens in den Arbeitsspeicher (11a) übernommen werden kann.RDS radio receiver according to one of the preceding claims, characterized in that only the PI code and the PS code are stored in the program memory (10) for the programs assigned to the program selection buttons, and in that the central control unit (9) checks whether a station search is in progress For the reception frequency found by the background receiver (19), a PS code associated with its PI code is already stored in the program memory (10) and can be transferred to the main memory (11a) for immediate display of the station name. RDS-Rundfunkempfänger nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, daß die zentrale Steuereinheit (9) die Abstimmung des Vordergrundempfängers (1) auf eine alternative Frequenz mit geringfügig besserer Empfangsqualität nur mit einer zeitlichen Verzögerung vollzieht und daß die zeitliche Verzögerung in Abhängigkeit des Qualitätsunterschiedes gesteuert wird.RDS radio receiver according to one of the preceding claims, characterized in that the central control unit (9) only tunes the foreground receiver (1) to an alternative frequency with a slightly better reception quality with a time delay and that the time delay is controlled as a function of the quality difference becomes. RDS-Rundfunkempfänger nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die zentrale Steuereinheit (9) für den Fall, daß der Vordergrundempfänger (1) auf einen RDS-Sender ohne Verkehrsmeldungen eingestellt ist, RDS-TP-Frequenzen derselben Sendeanstalt aus dem Hintergrundspeicher (11b) in den Zusatzspeicher (11c) überträgt, diese periodisch auf Empfangsqualität bewertet, den Status des TA-Bits überwacht und den Tuner (2) des Vordergrundempfängers (1) auf die empfangsbeste TP-Frequenz abstimmt, solange das TA-Bit = 1 gesetzt ist.RDS radio receiver according to one of the preceding claims, characterized in that the central control unit (9) in the event that the foreground receiver (1) is set to an RDS transmitter without traffic reports, RDS-TP frequencies of the same broadcaster from the background memory ( 11b) in the additional memory (11c), periodically evaluates this for reception quality, monitors the status of the TA bit and tunes the tuner (2) of the foreground receiver (1) to the best reception TP frequency as long as the TA bit = 1 is set is.
EP91108609A 1990-06-01 1991-05-27 RDS broadcast receiver with a device for searching for currently receivable alternative frequencies Expired - Lifetime EP0459360B1 (en)

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DE4017756A DE4017756A1 (en) 1990-06-01 1990-06-01 RDS BROADCAST RECEIVER WITH A DEVICE FOR SEARCHING CURRENTLY RECEIVABLE ALTERNATIVE FREQUENCIES
DE4017756 1990-06-01

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EP0497115A2 (en) * 1991-02-01 1992-08-05 Blaupunkt-Werke GmbH RDS broadcast receiver
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FR2699769A1 (en) * 1992-12-21 1994-06-24 Electro Informatiques Eur Et Method for optimizing the choice of frequencies in a variable frequency radio transmission, and equipment for its implementation.
EP0725503A1 (en) * 1995-02-03 1996-08-07 Robert Bosch Gmbh Method for receiving and outputting broadcast programmes with supplementary digital information and broadcast receiver for displaying digital information of other broadcast programmes
KR970009478A (en) * 1995-07-26 1997-02-24 요트.게.아. 롤페즈 Broadcast receivers, modules and chip cards
WO1997042724A1 (en) * 1996-05-06 1997-11-13 Digital D.J. Incorporated Data broadcast system with multiple-tuner receiver
EP0892513A2 (en) * 1997-07-15 1999-01-20 Robert Bosch Gmbh Broadcast receiver for the reception of supplementary data transmitted with the broadcast programme
EP0905929A2 (en) 1997-09-26 1999-03-31 Robert Bosch Gmbh Method for rapid optimal selection of alternative frequencies in a Radio Data System receiver
EP0921637A2 (en) * 1997-12-04 1999-06-09 GRUNDIG Aktiengesellschaft Broadcast receiver with a memory update of stored broadcast frequencies
DE19531527C2 (en) * 1995-08-26 1999-09-02 Grundig Ag Method and circuit arrangement for changing the program in the event of a brief signal failure
EP0994587A2 (en) * 1998-10-13 2000-04-19 Robert Bosch Gmbh Method for selecting a broadcast programme from a secondary memory of a broadcast receiver, which is capable of receiving Radio Data System (RDS) signals
EP1032128A1 (en) * 1999-02-23 2000-08-30 Mannesmann VDO Aktiengesellschaft Method for processing transmitter and program related data in an FM RDS receiver
EP1056203A1 (en) * 1999-05-26 2000-11-29 Mannesmann VDO Aktiengesellschaft Method for selection of a tuning frequency
DE10004002A1 (en) * 2000-01-29 2001-08-09 Bosch Gmbh Robert Method for masking interruptions in the reproduction of received radio signals
EP1275562A2 (en) * 2001-07-10 2003-01-15 Harman/Becker Automotive Systems (Becker Division) GmbH Radio receiver
EP1357670A2 (en) * 2002-04-26 2003-10-29 Robert Bosch Gmbh Multichannel radio receiver
EP1881701A1 (en) * 2006-07-20 2008-01-23 Samsung Electronics Co., Ltd. Broadcasting receiving apparatus for providing a fixed channel, and method therefor
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EP0497116A2 (en) * 1991-02-01 1992-08-05 HENZE, Werner RDS broadcast receiver
EP0497116B1 (en) * 1991-02-01 1996-11-27 HENZE, Werner RDS broadcast receiver
EP0497115B1 (en) * 1991-02-01 1998-05-27 Blaupunkt-Werke GmbH Method for bridging over audio signal interruptions
EP0497115A2 (en) * 1991-02-01 1992-08-05 Blaupunkt-Werke GmbH RDS broadcast receiver
FR2699769A1 (en) * 1992-12-21 1994-06-24 Electro Informatiques Eur Et Method for optimizing the choice of frequencies in a variable frequency radio transmission, and equipment for its implementation.
WO1994015414A1 (en) * 1992-12-21 1994-07-07 3Ei - Europeenne D'etudes Electroniques Et Informatiques (S.A.R.L.) Process for optimizing frequency choice in variable frequency radio transmission and equipment for carrying out same
US5812937A (en) * 1993-04-08 1998-09-22 Digital Dj Inc. Broadcast data system with multiple-tuner receiver
EP0725503A1 (en) * 1995-02-03 1996-08-07 Robert Bosch Gmbh Method for receiving and outputting broadcast programmes with supplementary digital information and broadcast receiver for displaying digital information of other broadcast programmes
KR970009478A (en) * 1995-07-26 1997-02-24 요트.게.아. 롤페즈 Broadcast receivers, modules and chip cards
DE19531527C2 (en) * 1995-08-26 1999-09-02 Grundig Ag Method and circuit arrangement for changing the program in the event of a brief signal failure
WO1997042724A1 (en) * 1996-05-06 1997-11-13 Digital D.J. Incorporated Data broadcast system with multiple-tuner receiver
EP0892513A3 (en) * 1997-07-15 2004-02-11 Robert Bosch Gmbh Broadcast receiver for the reception of supplementary data transmitted with the broadcast programme
EP0892513A2 (en) * 1997-07-15 1999-01-20 Robert Bosch Gmbh Broadcast receiver for the reception of supplementary data transmitted with the broadcast programme
EP0905929A2 (en) 1997-09-26 1999-03-31 Robert Bosch Gmbh Method for rapid optimal selection of alternative frequencies in a Radio Data System receiver
EP0905929A3 (en) * 1997-09-26 2000-05-17 Robert Bosch Gmbh Method for rapid optimal selection of alternative frequencies in a Radio Data System receiver
EP0921637A3 (en) * 1997-12-04 2004-10-06 Grundig Multimedia B.V. Broadcast receiver with a memory update of stored broadcast frequencies
EP0921637A2 (en) * 1997-12-04 1999-06-09 GRUNDIG Aktiengesellschaft Broadcast receiver with a memory update of stored broadcast frequencies
EP0994587A2 (en) * 1998-10-13 2000-04-19 Robert Bosch Gmbh Method for selecting a broadcast programme from a secondary memory of a broadcast receiver, which is capable of receiving Radio Data System (RDS) signals
EP0994587A3 (en) * 1998-10-13 2004-03-17 Robert Bosch Gmbh Method for selecting a broadcast programme from a secondary memory of a broadcast receiver, which is capable of receiving Radio Data System (RDS) signals
WO2000051235A1 (en) * 1999-02-23 2000-08-31 Mannesmann Vdo Ag Method for processing transmitter and program related data in an fm rds receiver
US6711390B1 (en) 1999-02-23 2004-03-23 Siemens Vdo Automotive Ag Program related data in an FM RDS receiver
EP1032128A1 (en) * 1999-02-23 2000-08-30 Mannesmann VDO Aktiengesellschaft Method for processing transmitter and program related data in an FM RDS receiver
US6957053B1 (en) 1999-05-26 2005-10-18 Siemens Ag Method for selection of a receiver tuning frequency
WO2000074237A1 (en) * 1999-05-26 2000-12-07 Siemens Ag Method for selection of a receiver tuning frequency
EP1056203A1 (en) * 1999-05-26 2000-11-29 Mannesmann VDO Aktiengesellschaft Method for selection of a tuning frequency
DE10004002A1 (en) * 2000-01-29 2001-08-09 Bosch Gmbh Robert Method for masking interruptions in the reproduction of received radio signals
EP1275562A3 (en) * 2001-07-10 2003-12-10 Harman/Becker Automotive Systems (Becker Division) GmbH Radio receiver
EP1275562A2 (en) * 2001-07-10 2003-01-15 Harman/Becker Automotive Systems (Becker Division) GmbH Radio receiver
US7305225B2 (en) 2001-07-10 2007-12-04 Harman Becker Automotive Systems Gmbh Radio signal receiver
US7747232B2 (en) 2001-07-13 2010-06-29 Harman Becker Automotive Systems Gmbh Radio reception system with automatic tuning
EP1357670A2 (en) * 2002-04-26 2003-10-29 Robert Bosch Gmbh Multichannel radio receiver
EP1357670A3 (en) * 2002-04-26 2005-12-14 Robert Bosch Gmbh Multichannel radio receiver
EP1881701A1 (en) * 2006-07-20 2008-01-23 Samsung Electronics Co., Ltd. Broadcasting receiving apparatus for providing a fixed channel, and method therefor
EP2632065A3 (en) * 2012-02-27 2014-08-06 Alpine Electronics, Inc. Reception apparatus and method of displaying broadcasting station

Also Published As

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EP0459360A3 (en) 1992-04-08
EP0459360B1 (en) 1995-10-18
DE59106704D1 (en) 1995-11-23
DE4017756A1 (en) 1991-12-05

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