EP0364749B1 - Radio receiver - Google Patents

Radio receiver Download PDF

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Publication number
EP0364749B1
EP0364749B1 EP89117351A EP89117351A EP0364749B1 EP 0364749 B1 EP0364749 B1 EP 0364749B1 EP 89117351 A EP89117351 A EP 89117351A EP 89117351 A EP89117351 A EP 89117351A EP 0364749 B1 EP0364749 B1 EP 0364749B1
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Prior art keywords
stage
memory
output
microprocessor
input
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German (de)
French (fr)
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EP0364749A2 (en
EP0364749A3 (en
Inventor
Wilhelm Hegeler
Helmut Liman
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Blaupunkt Werke GmbH
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Blaupunkt Werke GmbH
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • 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
    • H04H60/27—Arrangements for recording or accumulating broadcast information or broadcast-related 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]

Definitions

  • the subject of property rights belongs to the area of radio receivers with a radio data signal decoder, or RDS decoder for short. This area includes car radios with RDS decoders.
  • the broadcasts of each broadcaster are transmitted over several carrier frequencies.
  • the transmitter locations for this are distributed over the transmission area of the broadcaster so that the weak reception zones of one carrier frequency are overlaid by strong reception zones of other carrier frequencies.
  • the entirety of these transmitter locations forms a program chain, and all carrier frequencies together result in the list of alternative frequencies, referred to briefly in the professional world as the AF list. These alternative frequencies therefore always transmit the same program.
  • the AF list belonging to the set carrier frequency has been transmitted for some time via the radio data signal.
  • This AF list is at the exit of the RDS decoder removable and is stored in a suitable memory, which is managed by a microprocessor.
  • the AF list for switching the radio receiver is available in the device if the field strength of the set carrier frequency is too low for interference-free reception.
  • a special form of transmission of the AF lists is described by Mielke in DE-OS 34 48 043.
  • the microprocessor controls the switchover of the car radio to the reception of one of the alternative frequencies stored in the memory. Frequently, this switchover first looks for the frequency that can be received with the greatest field strength.
  • the digital signals that can be taken off at the output of the RDS decoder are even more sensitive to interference than the analog signals with which the programs are transmitted to the carrier frequencies. Since there is basically the task of not storing any faulty digital signals in the memory, sometimes none or only after a long time some of the transmitted alternative frequencies get into the memory, even when a program is still worth listening to.
  • the object of the invention was to avoid these disadvantages and to achieve safe and rapid storage of at least a partial list of alternative frequencies.
  • the radio receiver shown in FIG. 1 as a block diagram is connected via an antenna 1 to the electromagnetic alternating field surrounding it.
  • the radio receiver has an input stage 2, which comprises a tunable mixing oscillator 3.
  • the mixing oscillator receives a corresponding control signal from a tuning unit 4.
  • This tuning unit includes a long-term memory 5, in which u. a. alternative frequencies are stored for a longer period.
  • the tuning unit 4 comprises a station search stage 6, in which a search can be started either by reducing the field strength, which triggers a search for the next stored alternative frequency, or by hand using a switch 7.
  • the intermediate frequency to which the modulation of the carrier frequency has been converted can be removed at the output of the input stage 2. This intermediate frequency is fed to the intermediate frequency stage 8.
  • the low-frequency modulation of the transmitter, the MPX signal is available at its output for further processing.
  • the 57 kHz subcarrier, which is modulated with the radio data signal, is filtered out of the MPX signal with the filter 10 and fed to the RDS decoder 11.
  • the actual useful signal is amplified in the NF stage 12 and reproduced via the loudspeaker 13.
  • a measuring stage 9 for the field strength of the set carrier frequency is also connected to the intermediate frequency stage 8. Its output is connected to station search stage 6. If the field strength of the set carrier frequency falls below a predefined threshold value, the next stored alternative frequency is searched for by the station search.
  • this information also includes the information about the program chain to which the set carrier frequency is assigned, the PI code (program identification).
  • the removal of the respectively desired data from the data stream which leaves the RDS decoder is controlled by a microprocessor 14. This microprocessor opens the individual circuits in the block diagram according to FIG. 1 at the time period provided in the microprocessor operating program, for which predetermined modules are then connected to one another for the exchange of data.
  • Gate outputs 15, -15 N are connected downstream of the output of the RDS decoder.
  • the gate circuit 15 is connected to an input stage 16 of the long-term memory 5, which comprises a group of memory locations 17, which are provided for storing PI codes.
  • the PI code of the set transmitter is stored in a free memory location. This PI code is contained in the received radio data signal several times more often than the AF lists according to Mielke's proposed transmission.
  • the detection of the PI code is therefore considerably more reliable, even if the reception of the digital data should already be disturbed.
  • a comparison stage 18 which checks whether the received PI code has already been stored in the memory. In this case, the PI code is not saved again.
  • Another input stage 20 of the long-term memory 5 is connected to the output of the tuning unit 4 via a gate circuit 19. Via this gate circuit 19, the control signal which sets the car radio to the received carrier frequency is converted into a data word which corresponds to the data word for this frequency in the list of alternative frequencies.
  • Several chains 21 of AF memory locations are connected to the input stage 20. Each chain 21 is assigned to a storage location 17.
  • the operating program of the microprocessor 14 ensures that in the long-term memory 5 the memory chain, which is assigned to the PI code transmitted by the transmitter, is called up to record the data word offered by the gate circuit 19; ie the control signal for the carrier frequency taken from the tuning system is stored in the called up memory chain.
  • the long-term memory 5 is not deleted by the normal operating program of the microprocessor.
  • the circuit described so far is the basis for the following method.
  • a programming station search is started via switch 7.
  • every RDS station received is automatically searched for and remains set for a certain period of time during which the station broadcasts its PI code several times.
  • This PI code is written into one of the free memory locations 17.
  • the output signal of the gate circuit 19 is also written into the memory chain 21 assigned to the PI code memory location.
  • the frequency information stored in the memory chains is available in a known manner to the transmitter search stage 6 during a search run triggered by the field strength measuring device 9 via the output stage 22 of the long-term memory.
  • the number of alternative frequencies that can be received at the vehicle location may well be smaller than the actually existing alternative frequencies in the program chain, especially in mountainous areas.
  • a second exemplary embodiment of the invention contains a development of the previously described circuit for filling in the missing alternative frequencies, which is explained with reference to FIG. 2. With this development, the list of alternative frequencies recorded at the vehicle location can be supplemented by the other alternative frequencies contained in the RDS signal.
  • the gate 151 at the output of the RDS decoder is assigned to the output of the data which contains the list of alternative frequencies. These data are stored in the free memory locations of the called chain 21 via the input stage 24 controlled by the microprocessor 14. This input stage 24 is followed by a changeover switch 25, to the second input of which the input stage 20 is connected.
  • the switch 25 comprises a comparison stage 26 which compares the alternative frequencies already stored with the alternative frequencies transmitted by the RDS signal and avoids the allocation of memory cells in the chain with the same frequency information.
  • the comparison stage 26 also provides a statement as to whether, in addition to the carrier frequency that has been set, other alternative frequencies are also read in the chain 21 that is called up, that is to say whether alternative frequencies are available in the long-term memory 5. If this is not the case, a station search is started, which searches for a station with the same PI code. For this purpose, the PI code is entered into the station search stage 6 instead of an alternative frequency via the output stage 23 assigned to the PI memory locations via a switch 27. The output stage 22 for the storage chains 21 is connected to the second input of the switch 27. This circuit is the basis for the following procedure.
  • the output stage 22 assigned to the memory chains 21 does not provide a signal because the comparison stage 26 can only determine the correspondence between the readable alternative frequencies and the setting of the receiver, then the output signal of the output stage 23 assigned to the PI memory locations is switched through to the transmitter search stage 6 via the switch 27 .
  • the receiver now looks for the next transmitter whose PI code matches the PI code of the previously received transmitter. The correspondence is checked in the comparison stage 18 which, in the event of a match, outputs a stop signal to the station search stage 6.
  • the programming search mentioned can also be switched on continuously during the playing time of a cassette.
  • the switchover of the low-frequency stage 12 to the switching stage 30 which effects cassette reproduction is connected via a switch 28 to the station search stage 6, to the second input of which the switch 7 is connected.

Abstract

A new radio receiver comprising a radio data signal decoder, a microprocessor and a store for the so-called alternative frequencies (AF lists) is described. The store of this radio receiver has mutually associated storage locations for the programme identification code (PI code) and storage chains for the AF lists. The storage input for the storage locations of the PI code follows the RDS decoder, the storage input for the storage chains is connected to the output of the tuning system. The stores are managed by a microprocessor. After passing through the entire FM band, the currently receivable frequencies which belong to the same programme identification code are stored in the appropriate storage chains in the store. <IMAGE>

Description

Der Gegenstand des Schutzrechts gehört zum Bereich der Rundfunkempfänger mit einem Radiodatensignaldecoder, kurz RDS-Decoder genannt. Dieser Bereich umfaßt insbesondere Autoradios mit RDS-Decodern.The subject of property rights belongs to the area of radio receivers with a radio data signal decoder, or RDS decoder for short. This area includes car radios with RDS decoders.

Bei dem Betrieb von Autoradios macht sich nachteilig bemerkbar, daß die Reichweite einer über einen Antennenmast an einen bestimmten Senderstandort abgestrahlte UKW-Trägerfrequenz begrenzt ist. Bei längeren Fahrtstrecken des Autos, die von diesem Senderstandort wegführen, wird die Feldstärke des Sendersignals ständig schwächer. Die Wiedergabe der dem Sendersignal entsprechenden Sendung über ein auf den Empfang dieser Trägerfrequenz eingestelltes Autoradio wird dadurch zunehmend gestört.When operating car radios, it is disadvantageously noticeable that the range of an FM carrier frequency radiated to a specific transmitter location via an antenna mast is limited. The field strength of the transmitter signal becomes constantly weaker when the car is traveling longer distances from this transmitter location. The reproduction of the program corresponding to the transmitter signal via a car radio set to receive this carrier frequency is thereby increasingly disturbed.

Wegen der begrenzten Reichweite der UKW-Trägerfrequenzen werden die Sendungen jeder Sendeanstalt über mehrere Trägerfrequenzen übertragen. Die Senderstandorte hierfür sind über das Sendegebiet der Sendeanstalt verteilt so angeordnet, daß die schwachen Empfangszonen der einen Trägerfrequenz von starken Empfangszonen anderer Trägerfrequenzen überlagert sind. Die Gesamtheit dieser Senderstandorte bildet eine Programmkette, und alle Trägerfrequenzen zusammen ergeben die Liste der Alternativen Frequenzen, in der Fachwelt kurz als AF-Liste bezeichnet. Diese alternativen Frequenzen übertragen somit immer dasselbe Programm.Because of the limited range of the FM carrier frequencies, the broadcasts of each broadcaster are transmitted over several carrier frequencies. The transmitter locations for this are distributed over the transmission area of the broadcaster so that the weak reception zones of one carrier frequency are overlaid by strong reception zones of other carrier frequencies. The entirety of these transmitter locations forms a program chain, and all carrier frequencies together result in the list of alternative frequencies, referred to briefly in the professional world as the AF list. These alternative frequencies therefore always transmit the same program.

Durch die räumliche Verteilung der Senderstandorte ist es möglich, bei zunehmender Störung der Wiedergabe des gehörten Programms auf eine andere, besser empfangbare Trägerfrequenz aus der AF-Liste umzuschalten. Um dieses Umschalten zu erleichtern, wird seit einiger Zeit über das Radio-Datensignal die zu der eingestellten Trägerfrequenz gehörende AF-Liste übertragen. Diese AF-Liste ist am Ausgang des RDS-Decoders abnehmbar und wird in einem geeigneten Speicher abgelegt, der von einem Mikroprozessor verwaltet wird. Damit steht die AF-Liste zur Umschaltung des Rundfunkempfängers im Gerät zur Verfügung, wenn die Feldstärke der eingestellten Trägerfrequenz für einen störungsfreien Empfang zu gering wird. Eine besondere Form der Übertragung der AF-Listen ist von Mielke in der DE-OS 34 48 043 beschrieben.Due to the spatial distribution of the transmitter locations, it is possible to switch to another, more receivable carrier frequency from the AF list if the playback of the program being listened to increases. In order to facilitate this switching, the AF list belonging to the set carrier frequency has been transmitted for some time via the radio data signal. This AF list is at the exit of the RDS decoder removable and is stored in a suitable memory, which is managed by a microprocessor. The AF list for switching the radio receiver is available in the device if the field strength of the set carrier frequency is too low for interference-free reception. A special form of transmission of the AF lists is described by Mielke in DE-OS 34 48 043.

Wenn die Empfangsfeldstärke einen vorgegebenen Schwellwert unterschreitet, steuert der Mikroprozessor die Umschaltung des Autoradios auf den Empfang einer der in dem Speicher abgelegten alternativen Frequenzen. Häufig wird bei dieser Umschaltung zunächst die Frequenz gesucht, die mit der größten Feldstärke empfangen werden kann. Diese Empfänger arbeiten nach dem sogenannten "Best-Station"-Prinzip, das u. a. in der DE-PS 15 91 144 beschrieben ist.If the received field strength falls below a predetermined threshold value, the microprocessor controls the switchover of the car radio to the reception of one of the alternative frequencies stored in the memory. Frequently, this switchover first looks for the frequency that can be received with the greatest field strength. These receivers work on the so-called "best station" principle, which u. a. is described in DE-PS 15 91 144.

Die am Ausgang des RDS-Decoders abnehmbaren digitalen Signale sind noch störempfindlicher als die analogen Signale, mit denen die Sendungen auf den Trägerfrequenzem übertragen werden. Da grundsätzlich die Aufgabe besteht, keine fehlerhaften digitalen Signale in dem Speicher abzulegen, gelangen mitunter keine oder erst nach längerer Zeit einige der übertragenen alternativen Frequenzen in den Speicher, selbst bei dem Empfang einer durchaus noch hörenswerten Sendung.The digital signals that can be taken off at the output of the RDS decoder are even more sensitive to interference than the analog signals with which the programs are transmitted to the carrier frequencies. Since there is basically the task of not storing any faulty digital signals in the memory, sometimes none or only after a long time some of the transmitted alternative frequencies get into the memory, even when a program is still worth listening to.

Der Erfindung lag die Aufgabe zugrunde, diese Nachteile zu vermeiden und zu einer sicheren und schnellen Speicherung wenigstens einer Teilliste alternativer Frequenzen zu gelangen.The object of the invention was to avoid these disadvantages and to achieve safe and rapid storage of at least a partial list of alternative frequencies.

Die wesentlichen Merkmale eines Rundfunkempfängers, mit dem diese Aufgabe lösbar ist, sind in dem Anspruch 1 aufgeführt. Anhand von Ausführungsbeispielen wird die Erfindung näher erläutert. In den Unteransprüchen sind die wesentlichen Merkmale vorteilhafter Ausgestaltungen der Erfindung angegeben.The essential features of a radio receiver with which this object can be achieved are listed in claim 1. The invention is explained in more detail using exemplary embodiments. The essential features of advantageous embodiments of the invention are specified in the subclaims.

In den beigefügten Zeichnungen zeigt

Figur 1
ein Blockschaltbild eines erfindungsgemäßen Rundfunkempfängers
Figur 2
eine Ergänzung des Blockschaltbildes nach Figur 1 gem. eines erweiterten Ausführungsbeispiels der Erfindung
Figur 3
eine weitere Ergänzung des Blockschaltbildes nach Figur 1 gem. eines dritten Ausführungsbeispiels der Erfindung.
In the accompanying drawings
Figure 1
a block diagram of a radio receiver according to the invention
Figure 2
an addition to the block diagram of Figure 1 acc. an expanded embodiment of the invention
Figure 3
a further addition to the block diagram of Figure 1 acc. of a third embodiment of the invention.

Der in Figur 1 als Blockschaltbild dargestellte Rundfunkempfänger ist über eine Antenne 1 an das ihn umgebende elektromagnetische Wechselfeld angeschlossen. Der Rundfunkempfänger verfügt über eine Eingangsstufe 2, die einen abstimmbaren Mischoszillator 3 umfaßt. Zur Abstimmung auf die Trägerfrequenz eines bestimmten Senders erhält der Mischoszillator ein entsprechendes Steuersignal aus einer Abstimmeinheit 4. Zu dieser Abstimmeinheit gehört ein Langzeitspeicher 5, in dem u. a. alternative Frequenzen längerfristig gespeichert sind. Daneben umfaßt die Abstimmeinheit 4 eine Sendersuchlaufstufe 6, in der ein Suchlauf sowohl durch eine Feldstärkeminderung, die ein Aufsuchen der nächsten gespeicherten alternativen Frequenz auslöst, als auch von Hand mit einem Schalter 7 gestartet werden kann.The radio receiver shown in FIG. 1 as a block diagram is connected via an antenna 1 to the electromagnetic alternating field surrounding it. The radio receiver has an input stage 2, which comprises a tunable mixing oscillator 3. To tune to the carrier frequency of a particular transmitter, the mixing oscillator receives a corresponding control signal from a tuning unit 4. This tuning unit includes a long-term memory 5, in which u. a. alternative frequencies are stored for a longer period. In addition, the tuning unit 4 comprises a station search stage 6, in which a search can be started either by reducing the field strength, which triggers a search for the next stored alternative frequency, or by hand using a switch 7.

Am Ausgang der Eingangsstufe 2 ist die Zwischenfrequenz abnehmbar, auf die die Modulation der Trägerfrequenz umgesetzt worden ist. Diese Zwischenfrequenz wird der Zwischenfrequenzstufe 8 zugeführt. An deren Ausgang steht die niederfrequente Modulation des Senders, das MPX-Signal, zur Weiterverarbeitung der Verfügung. Aus dem MPX-Signal wird mit dem Filter 10 der 57-kHz-Hilfsträger, der mit dem Radiodatensignal moduliert ist, herausgefiltert und dem RDS-Decoder 11 zugeführt.The intermediate frequency to which the modulation of the carrier frequency has been converted can be removed at the output of the input stage 2. This intermediate frequency is fed to the intermediate frequency stage 8. The low-frequency modulation of the transmitter, the MPX signal, is available at its output for further processing. The 57 kHz subcarrier, which is modulated with the radio data signal, is filtered out of the MPX signal with the filter 10 and fed to the RDS decoder 11.

Das eigentliche Nutzsignal, die Sendung der Programmkette, wird in der NF-Stufe 12 verstärkt und über den Lautsprecher 13 wiedergegeben.The actual useful signal, the transmission of the program chain, is amplified in the NF stage 12 and reproduced via the loudspeaker 13.

An die Zwischenfrequenzstufe 8 ist außerdem eine Meßstufe 9 für die Feldstärke der eingestellten Trägerfrequenz angeschlossen. Deren Ausgang ist mit der Sendersuchlaufstufe 6 verbunden. Unterschreitet die Feldstärke der eingestellten Trägerfrequenz einen vorgegebenen Schwellwert, so wird die nächste gespeicherte alternative Frequenz durch den Sendersuchlauf aufgesucht.A measuring stage 9 for the field strength of the set carrier frequency is also connected to the intermediate frequency stage 8. Its output is connected to station search stage 6. If the field strength of the set carrier frequency falls below a predefined threshold value, the next stored alternative frequency is searched for by the station search.

An den Ausgängen des RDS-Decoders 11 sind die verschiedenen, in diesem System verfügbaren Daten zu gewissen Taktzeiten abnehmbar. Neben den bereits erwähnten AF-Listen gehören auch die Informationen über die Programmkette, welcher die eingestellte Trägerfrequenz zugeordnet ist, der PI-Code (Programm-Identification), zu diesen Daten. Die Entnahme der jeweils gewünschten Daten aus dem Datenstrom, welcher den RDS-Decoder verläßt, wird durch einen Mikroprozessor 14 gesteuert. Dieser Mikroprozessor öffnet die einzelnen Schaltungen in dem Blockschaltbild gemäß Figur 1 zu dem im Mikroprozessorbetriebsprogramm vorgesehenen Zeitdauer, für welche dann vorbestimmte Baugruppen zum Austausch von Daten miteinander verbunden sind.The various data available in this system can be removed at certain cycle times at the outputs of the RDS decoder 11. In addition to the AF lists already mentioned, this information also includes the information about the program chain to which the set carrier frequency is assigned, the PI code (program identification). The removal of the respectively desired data from the data stream which leaves the RDS decoder is controlled by a microprocessor 14. This microprocessor opens the individual circuits in the block diagram according to FIG. 1 at the time period provided in the microprocessor operating program, for which predetermined modules are then connected to one another for the exchange of data.

Dem Ausgang des RDS-Decoders sind Torschaltungen 15,-15 N nachgeschaltet. Die Torschaltung 15 ist an eine Eingangsstufe 16 des Langzeitspeichers 5 angeschlossen, der eine Gruppe von Speicherplätzen 17 umfaßt, welche für die Ablage von PI-Codes vorgesehen sind. In einem freien Speicherplatz wird der PI-Code des eingestellten Senders abgelegt. Dieser PI-Code ist im empfangenen Radiodatensignal mehrfach häufiger enthalten als die AF-Listen nach dem Übertragungsvorschlag von Mielke.Gate outputs 15, -15 N are connected downstream of the output of the RDS decoder. The gate circuit 15 is connected to an input stage 16 of the long-term memory 5, which comprises a group of memory locations 17, which are provided for storing PI codes. The PI code of the set transmitter is stored in a free memory location. This PI code is contained in the received radio data signal several times more often than the AF lists according to Mielke's proposed transmission.

Die Erkennung des PI-Codes ist daher erheblich sicherer, auch wenn der Empfang der digitalen Daten bereits gestört sein sollte. In der Eingangsstufe 16 befindet sich eine Vergleichsstufe 18 die überprüft, ob der empfangene PI-Code bereits im Speicher abgelegt ist. In diesem Fall erfolgt keine neue Ablage des PI-Codes.The detection of the PI code is therefore considerably more reliable, even if the reception of the digital data should already be disturbed. In the input stage 16 there is a comparison stage 18 which checks whether the received PI code has already been stored in the memory. In this case, the PI code is not saved again.

Eine weitere Eingangsstufe 20 des Langzeitspeichers 5 ist mit dem Ausgang der Abstimmeinheit 4 über eine Torschaltung 19 verbunden. Über diese Torschaltung 19 wird das Steuersignal, welches das Autoradio auf die empfangene Trägerfrequenz einstellt, in ein Datenwort umgewandelt, das dem Datenwort für diese Frequenz in der Liste alternativer Frequenzen entspricht.
An die Eingangsstufe 20 sind mehrere Ketten 21 von AF-Speicherplätzen angeschlossen. Jede Kette 21 ist jeweils einem Speicherplatz 17 zugeordnet. Das Betriebsprogramm des Mikroprozessors 14 stellt sicher, daß in dem Langzeitspeicher 5 die Speicherkette, die dem vom Sender übermittelten PI-Code zugeordnet ist, zur Aufnahme des von der Torschaltung 19 angebotenen Datenworts aufgerufen wird; d. h. in der aufgerufenen Speicherkette wird das dem Abstimmsystem entnommene Steuersignal für die Trägerfrequenz abgelegt. Wie bereits erwähnt, wird der Langzeitspeicher 5 durch das normale Betriebsprogramm des Mikroprozessors nicht gelöscht.Another input stage 20 of the long-term memory 5 is connected to the output of the tuning unit 4 via a gate circuit 19. Via this gate circuit 19, the control signal which sets the car radio to the received carrier frequency is converted into a data word which corresponds to the data word for this frequency in the list of alternative frequencies.
Several chains 21 of AF memory locations are connected to the input stage 20. Each chain 21 is assigned to a storage location 17. The operating program of the microprocessor 14 ensures that in the long-term memory 5 the memory chain, which is assigned to the PI code transmitted by the transmitter, is called up to record the data word offered by the gate circuit 19; ie the control signal for the carrier frequency taken from the tuning system is stored in the called up memory chain. As already mentioned, the long-term memory 5 is not deleted by the normal operating program of the microprocessor.

Die bisher beschriebene Schaltung ist Grundlage für folgendes Verfahren. Bei der 1. Inbetriebnahme des Rundfunkgerätes wird über den Schalter 7 ein Programmiersendersuchlauf gestartet. Bei diesem Suchlauf wird jeder empfangene RDS-Sender automatisch aufgesucht und bleibt für eine gewisse Zeitdauer eingestellt, während welcher der Sender mehrfach seinen PI-Code ausstrahlt. Dieser PI-Code wird in dem einen der freien Speicherplätze 17 eingeschrieben. Während dieser Zeitdauer wird auch das Ausgangssignal der Torschaltung 19 in die dem PI-Code-Speicherplatz zugeordneten Speicherkette 21 eingeschrieben. Nach einem ersten Durchlauf des Spektrums hat man schließlich eine am Fahrzeugstandort orientierte Liste alternativer Frequenzen für alle empfangbaren Progammketten gespeichert. Der RDS-Empfänger kann somit alternative Frequenzen aus seiner eigenen Abstimmung kennenlernen.The circuit described so far is the basis for the following method. When the radio is put into operation for the first time, a programming station search is started via switch 7. During this search, every RDS station received is automatically searched for and remains set for a certain period of time during which the station broadcasts its PI code several times. This PI code is written into one of the free memory locations 17. During this period, the output signal of the gate circuit 19 is also written into the memory chain 21 assigned to the PI code memory location. After a first run of the spectrum you finally have a list of alternative frequencies based on the vehicle location is stored for all receivable program chains. The RDS receiver can thus get to know alternative frequencies from its own tuning.

Die in den Speicherketten gespeicherten Frequenzangaben stehen bei einem vom Feldstärkemeßgerät 9 ausgelösten Suchlauf über die Ausgangsstufe 22 des Langzeitspeichers in bekannter Weise der Sendersuchlaufstufe 6 zur Verfügung. Die Anzahl der am Fahrzeugstandort empfangbaren alternativen Frequenzen kann durchaus kleiner sein, als die tatsächlich vorhandenen alternativen Frequenzen der Programmkette, vor allem in bergiger Gegend. Ein zweites Ausführungsbeispiel der Erfindung enthält eine Weiterbildung der bisher beschriebenen Schaltung zur Auffüllung der fehlenden alternativen Frequenzen, die anhand der Figur 2 erläutert wird. Mit dieser Weiterbildung kann die am Fahrzeugstandort aufgenommene Liste alternativer Frequenzen durch die im RDS-Signal enthaltenen übrigen alternativen Frequenzen ergänzt werden.The frequency information stored in the memory chains is available in a known manner to the transmitter search stage 6 during a search run triggered by the field strength measuring device 9 via the output stage 22 of the long-term memory. The number of alternative frequencies that can be received at the vehicle location may well be smaller than the actually existing alternative frequencies in the program chain, especially in mountainous areas. A second exemplary embodiment of the invention contains a development of the previously described circuit for filling in the missing alternative frequencies, which is explained with reference to FIG. 2. With this development, the list of alternative frequencies recorded at the vehicle location can be supplemented by the other alternative frequencies contained in the RDS signal.

Während an dem Tor 15 des RDS-Decoders der PI-Code entnommen wird, ist das Tor 151 am Ausgang des RDS-Decoders der Ausgabe der Daten zugeordnet, die die Liste der alternativen Frequenzen enthält. Diese Daten werden über die vom Mikroprozessor 14 gesteuerte Eingangsstufe 24 in den freien Speicherplätzen der aufgerufenen Kette 21 abgelegt. Dieser Eingangsstufe 24 ist ein Umschalter 25 nachgeschaltet, an dessen zweiten Eingang die Eingangsstufe 20 angeschlossen ist. Der Umschalter 25 umfaßt eine Vergleichsstufe 26, die die bereits gespeicherten alternativen Frequenzen mit den vom RDS-Signal übermittelten alternativen Frequenzen vergleicht und die Belegung von Speicherzellen in der Kette mit gleichen Frequenzangaben vermeidet.While the PI code is removed from the gate 15 of the RDS decoder, the gate 151 at the output of the RDS decoder is assigned to the output of the data which contains the list of alternative frequencies. These data are stored in the free memory locations of the called chain 21 via the input stage 24 controlled by the microprocessor 14. This input stage 24 is followed by a changeover switch 25, to the second input of which the input stage 20 is connected. The switch 25 comprises a comparison stage 26 which compares the alternative frequencies already stored with the alternative frequencies transmitted by the RDS signal and avoids the allocation of memory cells in the chain with the same frequency information.

Wird der eingestellte Sender zu schwach, so daß ein Suchlauf nach einer alternativen Frequenz ausgelöst wird, so kann die anhand der Figur 3 erläuterte Schaltungsvariante das erste Ausführungsbeispiel ergänzen. Die Vergleichsstufe 26 liefert zugleich eine Aussage, ob neben der eingestellten Trägerfrequenz überhaupt noch weitere alternativen Frequenzen in der auf gerufenen Kette 21 eingelesen sind, ob also alternative Frequenzen in dem Langzeitspeicher 5 verfügbar sind. Ist dies nicht der Fall, dann wird ein Sendersuchlauf gestartet, der nach einem Sender mit gleichem PI-Code sucht. Dazu wird über die den PI-Speicherplätzen zugeordnete Ausgangsstufe 23 über einen Umschalter 27 der PI-Code anstelle einer alternativen Frequenz in die Sendersuchlaufstufe 6 eingegeben. An den zweiten Eingang des Umschalters 27 ist die Ausgangsstufe 22 für die Speicherketten 21 angeschlossen. Diese Schaltung ist Grundlage für folgendes Verfahren. Liefert die den Speicherketten 21 zugeordnete Ausgangsstufe 22 kein Signal, weil die Vergleichsstufe 26 nur Übereinstimmung zwischen den auslesbaren alternativen Frequenzen und der Einstellung des Empfängers feststellen kann, dann wird über den Umschalter 27 das Ausgangssignal der den PI-Speicherplätzen zugeordneten Ausgangsstufe 23 zur Sendersuchlaufstufe 6 durchgeschaltet. Der Empfänger sucht nunmehr den nächsten Sender auf, dessen PI-Code mit dem PI-Code des zuvor empfangenen Senders übereinstimmt. Die Übereinstimmung wird in der Vergleichsstufe 18 geprüft, die bei Übereinstimmung ein Stopsignal an die Sendersuchlaufstufe 6 gibt.If the tuned transmitter becomes too weak, so that a search for an alternative frequency is triggered, the circuit variant explained with reference to FIG. 3 can supplement the first exemplary embodiment. The comparison stage 26 also provides a statement as to whether, in addition to the carrier frequency that has been set, other alternative frequencies are also read in the chain 21 that is called up, that is to say whether alternative frequencies are available in the long-term memory 5. If this is not the case, a station search is started, which searches for a station with the same PI code. For this purpose, the PI code is entered into the station search stage 6 instead of an alternative frequency via the output stage 23 assigned to the PI memory locations via a switch 27. The output stage 22 for the storage chains 21 is connected to the second input of the switch 27. This circuit is the basis for the following procedure. If the output stage 22 assigned to the memory chains 21 does not provide a signal because the comparison stage 26 can only determine the correspondence between the readable alternative frequencies and the setting of the receiver, then the output signal of the output stage 23 assigned to the PI memory locations is switched through to the transmitter search stage 6 via the switch 27 . The receiver now looks for the next transmitter whose PI code matches the PI code of the previously received transmitter. The correspondence is checked in the comparison stage 18 which, in the event of a match, outputs a stop signal to the station search stage 6.

Ist das Autoradio mit einem Cassettenspieler 29 kombiniert, dann kann der erwähnte Prgrammiersuchlauf auch während der Abspielzeit einer Cassette ständig eingeschaltet sein. Dazu ist die Umschaltung der Niederfrequenzstufe 12 auf die Cassettenwiedergabe bewirkende Schaltstufe 30 über einen Umschalter 28 an die Sendersuchlaufstufe 6 angeschlossen, an deren zweiten Eingang der Schalter 7 angeschlossen ist.If the car radio is combined with a cassette player 29, the programming search mentioned can also be switched on continuously during the playing time of a cassette. For this purpose, the switchover of the low-frequency stage 12 to the switching stage 30 which effects cassette reproduction is connected via a switch 28 to the station search stage 6, to the second input of which the switch 7 is connected.

Claims (4)

  1. Radio receiver having a radio data signal decoder, a microprocessor and a memory for alternative frequencies which is connected on the output side to an input of the tuning stage of the radio receiver via gate circuits controlled by the microprocessor, characterized in that the memory (15) comprises a plurality of memory chains (21) for lists of alternative frequencies, in that each memory chain is assigned a memory location (17) for the PI code, which is common to the alternative frequencies listed in the respective memory chain (21), in that the input stage (16) for the memory locations (17) is connected via a gate circuit (15) controlled by the microprocessor (14) to the output of the RDS decoder (11), whereas the input stages (20) for the memory chains (21) are connected to the output of the tuning stage (4) via a gate circuit (19) controlled by the microprocessor, the microprocessor (14) being programmed in the case of a search run in such a way that a received PI code is stored in the memory location (17) and at the same time the data at the output of the gate circuit (19) which correspond to the instantaneously set frequency are stored in the memory chain (21) assigned to this memory location (17).
  2. Radio receiver according to Claim 1, characterized in that there is connected downstream of the input stage (20) for the memory chains (21) a changeover switch (25) whose second input is connected via a gate circuit (151) controlled by the microprocessor to the RDS decoder output for the AF lists.
  3. Radio receiver according to Claim 1 or 2, characterized in that the output stage (23) for the memory locations (17) is connected via a changeover switch (27) to a control input of the tuning stage (4) which upon through-connection of the output stage (23) initiates a search run for a transmitter having the output PI code.
  4. Radio receiver according to Claim 1, 2 or 3, characterized in that a cassette player (29) having a turn-on stage (30) is connected to a LF stage (12) via a changeover switch (31), and in that the output of the turn-on stage is connected via a changeover switch (28) controlled by the microprocessor to a control input of the tuning stage (4) which upon through-connection of the turn-on stage initiates a programming run of the transmitter searching stage (6) over the entire transmitter spectrum.
EP89117351A 1988-10-21 1989-09-20 Radio receiver Revoked EP0364749B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3835870 1988-10-21
DE3835870A DE3835870C1 (en) 1988-10-21 1988-10-21

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EP0364749A2 EP0364749A2 (en) 1990-04-25
EP0364749A3 EP0364749A3 (en) 1991-09-04
EP0364749B1 true EP0364749B1 (en) 1995-01-11

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EP89117351A Revoked EP0364749B1 (en) 1988-10-21 1989-09-20 Radio receiver

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EP (1) EP0364749B1 (en)
JP (1) JPH02165715A (en)
AT (1) ATE117144T1 (en)
DE (2) DE3835870C1 (en)
ES (1) ES2068864T3 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005413C2 (en) * 1990-02-21 1993-12-16 Grundig Emv RDS radio receiver with a facility for the accelerated finding of alternative frequencies
DE4024366C2 (en) * 1990-08-01 1993-12-09 Blaupunkt Werke Gmbh Car radio with a radio data signal decoder
DE4038597A1 (en) * 1990-12-04 1992-06-11 Grundig Emv RDS BROADCAST RECEIVER WITH EXTENDED STORAGE CAPACITY FOR DETECTING ALTERNATIVE FREQUENCIES
DE4103062C2 (en) * 1991-02-01 1994-03-31 Blaupunkt Werke Gmbh Radio receiver
DE4103779C2 (en) * 1991-02-08 1995-02-16 Blaupunkt Werke Gmbh RDS radio receiver
DE4135942A1 (en) * 1991-10-31 1993-05-06 Robert Bosch Gmbh, 7000 Stuttgart, De BROADCAST RECEIVER, ESPECIALLY VEHICLE RECEIVER
DE4137000C2 (en) * 1991-11-11 1994-06-09 Opel Adam Ag Method for field strength-dependent evaluation of radio information for vehicles
DE4206475C1 (en) * 1992-03-02 1993-07-08 Blaupunkt-Werke Gmbh, 3200 Hildesheim, De
JPH05344015A (en) * 1992-06-09 1993-12-24 Pioneer Electron Corp Audio equipment including rds receiver
DE19622432C2 (en) * 1996-06-04 1999-05-12 Rundfunkschutzrechte Ev Radio receiver with a station memory
DE19746960B4 (en) * 1997-10-24 2006-06-29 Robert Bosch Gmbh Method for storing data of broadcast transmission frequencies in a data memory of a radio receiver
DE19936114A1 (en) 1999-07-31 2001-02-01 Bosch Gmbh Robert Method and arrangement for selecting traffic information services receivable with at least one mobile receiver

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3448043A1 (en) * 1984-09-07 1986-06-05 Institut für Rundfunktechnik GmbH, 8000 München Method for tuning a mobile broadcast receiver
DE3432848C2 (en) * 1984-09-07 1986-09-11 Institut Fuer Rundfunktechnik Gmbh, 8000 Muenchen Method for transmitting digital information
JP2571247B2 (en) * 1988-01-07 1997-01-16 パイオニア株式会社 Receiving frequency selection method for radio data receiver

Also Published As

Publication number Publication date
ES2068864T3 (en) 1995-05-01
EP0364749A2 (en) 1990-04-25
DE58908878D1 (en) 1995-02-23
DE3835870C1 (en) 1990-01-18
JPH02165715A (en) 1990-06-26
ATE117144T1 (en) 1995-01-15
EP0364749A3 (en) 1991-09-04

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