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EP0415132B1 - Récepteur de radiodiffusion avec RDS muni d'un dispositif de commutation automatique sur un programme régional alternatif - Google Patents

Récepteur de radiodiffusion avec RDS muni d'un dispositif de commutation automatique sur un programme régional alternatif Download PDF

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Publication number
EP0415132B1
EP0415132B1 EP90115054A EP90115054A EP0415132B1 EP 0415132 B1 EP0415132 B1 EP 0415132B1 EP 90115054 A EP90115054 A EP 90115054A EP 90115054 A EP90115054 A EP 90115054A EP 0415132 B1 EP0415132 B1 EP 0415132B1
Authority
EP
European Patent Office
Prior art keywords
code
regional
reception
programme
program
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90115054A
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German (de)
English (en)
Other versions
EP0415132A3 (en
EP0415132A2 (fr
Inventor
Jörg Dipl.-Ing. Grundig E.M.V. Max Grun. Bauer
Gottfried Dipl. Ing. Grundig E.M.V. Kagerbauer
Dieter Dipl. Ing. Grundig E.M.V. Max Gru Nohse
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Original Assignee
Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH filed Critical Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
Publication of EP0415132A2 publication Critical patent/EP0415132A2/fr
Publication of EP0415132A3 publication Critical patent/EP0415132A3/de
Application granted granted Critical
Publication of EP0415132B1 publication Critical patent/EP0415132B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • H04H60/50—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 broadcast or relay stations
    • 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
    • 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
    • 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
    • H04H60/37—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 segments of broadcast information, e.g. scenes or extracting programme ID

Definitions

  • the radio data system is used to transmit additional information parallel to the broadcast radio program.
  • a 57 kHz subcarrier is amplitude modulated in quadrature with a binary data stream and then impressed via frequency modulation of the main carrier wave.
  • So-called PI codes (program identification codes) and AF codes (alternative frequencies codes) are transmitted, which allow the receiver to assign a transmitter frequency to a specific program chain and offer him alternative frequencies under which the same program can also be received. This is particularly important for mobile radio receivers because the reception conditions can change continuously due to a change of location.
  • Modern RDS car radios use the information transmitted to them to automatically switch to another reception frequency immediately and usually inaudibly for the device user if the reception conditions deteriorate, without interrupting the currently received program is created. While in the previous ARI traffic radio system, a driver had to continuously observe the corresponding signs on the motorway to find a frequency of the same program chain, he is now automatically provided with the same program over longer driving routes.
  • the PI code consists of a four-digit hexadecimal string, each HEX number being binary coded with 4 bits, so that the PI Code comprises a total of a sequence of 16 bits (see Fig. 2).
  • the first HEX number (bits 1 to 4) contains the country code, i.e. it indicates to which state sovereignty the sender is to be assigned.
  • the second HEX number (bits 5 to 8) defines the broadcast area, i.e. it differentiates between local, regional, supra-regional, national and international programs.
  • the third and fourth HEX numbers (bits 9 to 16) identify the different program groups, which are divided according to country.
  • Broadcasters that broadcast regionalized programs at certain times of the day either switch the PI code of their regional broadcasting stations during this period, or the regional broadcasting stations continuously transmit a regionalized PI code, even if a nationwide program is broadcast jointly across all stations in the broadcasting chain.
  • the program chain "NDR 1" (Nord Wegr Rundfunk, 1st program) can be used as an example for the second case.
  • the broadcasting area of this broadcaster is divided into the federal states “Schleswig-Holstein", “Hamburg” and “Lower Saxony”, which are supplied with different regional programs.
  • the state area "Lower Saxony” is again divided into four regional areas with individual broadcasting area identifiers.
  • the individual regional broadcasting area IDs within the PI codes are also broadcast if all stations of the NDR 1 have a common framework program, e.g. send out during the night.
  • the overall AF list consists of a sequence of local sublists, each of which begins with a code for the number of AFs, followed by the frequency of the associated parent transmitter to which the local list applies, and then in pairs Blocks shows an alternative frequency alternating with the frequency of the mother transmitter. From the sequence of numbers in which the alternative frequency to the mother frequency appears, it can be seen whether the AF is to be assigned to a station of the same or a neighboring transmission region of the same broadcaster. With a decreasing sequence of numbers for the frequency transmission, the AF belongs to a neighboring area in which a different regional program is broadcast at least temporarily.
  • the regional switch has now been programmed to suppress the broadcasting area identifier, an indiscriminate program change will then occur in times of regionalized program broadcasting, especially when driving through the border area of the adjoining regional broadcasting areas.
  • the radio listener is forced to switch the regional switch to recognize the transmission area code when the program is changed for the first time if he does not want to lose the regional program he was listening to. If he does not react quickly enough so that another program change has already taken place, the regional program originally received cannot be retrieved by operating the counter.
  • an RDS radio receiver is known from EP-A-0 305 172, which has electronic tuning, control and storage elements, as well as a device for assessing the reception quality, and which enables the reception of a regional program identified by PI code. If the reception conditions deteriorate, a change to an alternative frequency can be effected.
  • the present invention is therefore based on the object of specifying an RDS radio receiver, in particular an RDS car radio, in which the alternative frequencies stored from previous reception routines are examined to determine whether another regional program of the same broadcaster is being received if additional regional control elements are lost in the event of loss of a regional program chain can, which is then preferably set and accepted as part of a new program chain.
  • Another object of the invention is to automatically supply the user of a mobile RDS radio receiver with the originally selected program as long as the transmission conditions of the transmitter chain and the reception conditions at the reception location permit this.
  • the RDS radio receiver shown in FIG. 1 contains a synthesizer tuner 1, an IF amplifier 2 for selectively amplifying and demodulating the intermediate frequency, a stereo decoder 3 for decoding the stereo multiplex signal and a stereo amplifier 4.
  • the microprocessor 8 serves as the central control unit and also supplies the necessary tuning signal to the synthesizer tuner 1 for setting the transmitter.
  • the reception quality is monitored with the level detector 10 and the multi-path detector 7.
  • the level detector 10 takes the IF amplifier 2 according to the IF signal level to measure the signal field strength and converts it into a digital control signal for the microprocessor 8.
  • the multipath detector 7 is fed with the demodulated MPX signal and also delivers a multipath reception digital control signal to the microprocessor 8.
  • the analog / digital conversion of the control signals can also take place in the microprocessor, provided the processor is provided with corresponding converter inputs.
  • the RDS decoder 5 is also controlled with the demodulated multiplex signal. After a 57 kHz bandpass filtering, the quadrature-amplitude-modulated RDS signal is demodulated and the after A subsequent biphase and differential decoding of the digital data obtained for further processing is fed to the microprocessor 8.
  • the RDS signal includes also contain a so-called PS code (Program Service Name Code) (with the aid of which the name of the station received can be displayed alphanumerically.
  • PS code Program Service Name Code
  • the microprocessor 8 delivers corresponding control signals to the display 11.
  • the microprocessor 8 receives the associated control commands from the control panel 12.
  • the microprocessor 8 has RAM 6 with several memory levels as working and additional memory.
  • the EEPROM memory 9 serves as a non-volatile program memory, in the individual memory levels of which, in addition to the PI code and the PS code, for example up to 24 alternative frequencies per program can be stored for a spontaneous program call.
  • the data contained in the respective memory levels of the program memory 9 are copied into the working memory (first memory level of the RAM memory 6) by the microprocessor 8 when a specific program is called up.
  • the AFs are then checked by briefly tuning the receiver in terms of field strength, multi-path reception, transmitter center, RDS transmission quality and PI code checked and sorted in order of their reception quality.
  • the tuner 1 is tuned by the microprocessor 8 to the frequency with the highest field strength. Each time you switch to an alternative frequency due to deteriorating reception conditions, briefly tuning the receiver updates the quality rating and the ranking of the alternative frequencies again.
  • the PI code is also checked in each case, because during the reception of a program or in the period between the storage of a specific program in the program memory 9 and the retrieval of this program in the working memory 6 of the transmitters because of the broadcasting of a regional program in the corresponding one Receiving area may have switched the PI code.
  • the main memory 6 must then be loaded via the microprocessor 8 with the new PI code, which now differs in the second digit of the hexadecimal sequence of numbers (see FIG. 2), with the PS code (transmitter name) and the AFs the RDS data received via wave propagation parallel to the radio program are adapted to the regionalization.
  • the program chain "Bayern 2" with the alphanumeric transmitter display "BAY 2" and the PI code “D 322” should be used as a fictitious example.
  • the sequence of numbers of the frequency information in the local sublists shows which AFs belong to areas with temporarily different programs. This makes it possible to remove these AFs from direct access when adapting the AF data in the working memory 6 to the regionalization.
  • the working memory 6 holds only AFs from the regional transmission area in the "local part" of the AF list for a rapid frequency change.
  • the microprocessor 8 determines via the multipath detector 7 and the level detector 10 that the reception quality is no longer sufficient, because the user of the mobile RDS receiver, for. B. leaves the regional broadcast area or moves in the border area to neighboring broadcast regions, he will initiate an automatic frequency change, as exemplified in the flow chart of FIG. 3.
  • program step 1 the set transmitter is monitored for reception interference. If the reception quality drops below a certain minimum, the local part of the AF list in Working memory 6 removed the next-rank AF from the microprocessor 8 and checked for reception in step 3. If the minimum requirements are met, a comparison of the PI code with that of the mother frequency previously set follows in step 4. If the tests in steps 3 and 4 are negative, the program returns to step 2, ie the next AF that follows is taken from the local AF list. If the comparison in step 4 yielded a different PI code, the AF in step 5 is relegated from the local AF list to a part of the global AF list which is degraded as a subordinate.
  • step 6 the local AF list is reevaluated in step 6, or until step 7 recognizes that all AFs on the local AF list have been tested unsuccessfully.
  • the tuner 1 is tuned back to the original mother frequency in step 8 by the microprocessor 8, and a time counter is set to zero in step 10, it being ensured in step 9 that the time counter is only reset during the first run within one Frequency change routine takes place.
  • step 1 As long as the time t has not reached a certain time limit t 1, the program path leads back to the starting point (step 1) via step 11, ie further frequency change attempts are made.
  • step 12 After the time t 1, all AFs stored outside the local AF list in the working memory 6 are checked for reception in step 12 and their PI codes are evaluated. If there is an AF with exactly the same PI code compared to the previous mother frequency, it can be assumed that the local AF list was not complete. This frequency is then fixed in step 14 with the old PI code. If the microprocessor 8 only recognizes differing PI codes in step 13, then in step 15 a search is made for PI codes of regionally adjacent broadcasting stations of the same broadcaster. In step 16, the regional chain with the highest field strength is selected and the non-associated AFs are sorted out from the local AF list.
  • step 17 If the microprocessor 8 did not find any regionalized PI code of the same broadcaster while testing the entire AF list in step 15, an automatic RDS search over the entire reception area is started in step 17.
  • the microprocessor 8 stores the RDS transmitter frequencies tested for reception quality and PI code in a second memory level of the RAM memory 6 and selects the frequency with the highest field strength for transfer to the main memory (first memory level of the RAM memory 6). When selecting, frequencies whose PI code, with the exception of the transmission range identifier, are assigned the PI code of the previous reception frequency matches, preferred. If the microprocessor 8 recognizes in step 18 that no RDS station worth receiving has been found, then returning to step 17, the search is repeated until an RDS station with sufficient quality characteristics is recognized by changed reception conditions.
  • step 19 the microprocessor 8 tunes the tuner 1 to the new mother frequency obtained from steps 6, 14, 16 or 18. The program then returns to step 1 and initiates the same frequency change routine described above in the event of another reception disturbance.
  • the RDS receiving device tries to maintain an originally selected program as long as an alternative frequency that is worth receiving is available. Only then does it look for a frequency of a neighboring broadcast region of the same broadcaster. A change to a frequency of a different type of program chain only takes place if neither the mother frequency nor the associated AFs are recognized as RDS transmitter signals within a set period of time, or if no AFs can be set over a longer period due to poor reception quality and the mother frequency is already severely disturbed, although the parent transmitter is just identified as an RDS transmitter.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)

Claims (1)

  1. Récepteur de radiodiffusion RDS, notamment autoradio RDS, comportant des éléments électroniques de syntonisation, de commande et de mémoire pour la réception de programmes régionaux caractérisés par un code PI et comportant un dispositif pour évaluer la qualité de réception, dont le signal de sortie provoque la commutation automatique sur une autre fréquence dans le cas d'une altération des conditions de réception,
       caractérisé en ce que le récepteur radio RDS est agencé de telle sorte que, dans le cas de la réception d'un programme régional caractérisé par le code PI, pour lequel on ne dispose, pour le même code PI, d'aucune autre fréquence permettant la réception, un réglage est effectué successivement, pendant un bref intervalle de temps, sur les autres fréquences mémorisées restantes de la même chaîne de programme, un autre programme régional possédant un code régional différent de la chaîne de programme, qui peut être reçue dans les meilleures conditions, est sélectionné, et ce programme est alors réglé de préférence et est accepté en tant que nouvelle chaîne de programme régionale et que les autres fréquences, qui peuvent être respectivement reçues, de la nouvelle chaîne de programme régionale sont triées selon la séquence de leur aptitude à la réception dans la mémoire.
EP90115054A 1989-08-31 1990-08-06 Récepteur de radiodiffusion avec RDS muni d'un dispositif de commutation automatique sur un programme régional alternatif Expired - Lifetime EP0415132B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3928828 1989-08-31
DE3928828A DE3928828A1 (de) 1989-08-31 1989-08-31 Rds-rundfunkempfaenger mit einer einrichtung zum automatischen wechsel auf ein alternatives regionalprogramm

Publications (3)

Publication Number Publication Date
EP0415132A2 EP0415132A2 (fr) 1991-03-06
EP0415132A3 EP0415132A3 (en) 1991-10-09
EP0415132B1 true EP0415132B1 (fr) 1995-04-05

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Application Number Title Priority Date Filing Date
EP90115054A Expired - Lifetime EP0415132B1 (fr) 1989-08-31 1990-08-06 Récepteur de radiodiffusion avec RDS muni d'un dispositif de commutation automatique sur un programme régional alternatif

Country Status (3)

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EP (1) EP0415132B1 (fr)
AT (1) ATE120908T1 (fr)
DE (2) DE3928828A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2240679B (en) * 1990-01-31 1994-05-18 Pioneer Electronic Corp Method of selecting receiving frequency in RDS receiver
JPH03227131A (ja) * 1990-01-31 1991-10-08 Pioneer Electron Corp Ｒｄｓ受信機における受信周波数選択方法
DE4004987A1 (de) * 1990-02-19 1991-08-22 Grundig Emv Verfahren zum stationsabruf in rds-empfangsgeraeten
DE69225992T2 (de) * 1991-04-01 1998-10-22 Sony Corp RDS-Empfänger
DE4136068A1 (de) * 1991-11-01 1993-05-06 Telefunken Fernseh Und Rundfunk Gmbh, 3000 Hannover, De Rundfunkuebertragungssystem und rundfunkempfaenger fuer ukw-fm und digitalen rundfunk (dab)
DE4222877C2 (de) * 1992-07-11 1994-06-16 Grundig Emv Verfahren zur Übertragung regional unterschiedlicher Informationen in Gleichwellennetzen und Empfänger zum Durchführen der empfangsseitigen Maßnahmen
DE4226346A1 (de) * 1992-08-08 1994-02-10 Philips Patentverwaltung Schaltungsanordnung zur Bestimmung der Feldstärke von FM-Sendern
DE4231121C1 (de) * 1992-09-17 1994-01-05 Grundig Emv RDS-Rundfunkempfänger mit Anordnung zum knackfreien Umschalten auf alternative Frequenzen
FR2708816B1 (fr) * 1993-07-30 1995-09-08 Telediffusion Fse Procédé et système de diffusion d'au moins un programme de décrochage d'un réseau FM notamment synchrone.
DE19630578C2 (de) * 1996-07-30 2002-05-08 Bosch Gmbh Robert Rundfunkempfänger
DE19742494A1 (de) 1997-09-26 1999-04-01 Bosch Gmbh Robert Verfahren zur schnellen optimalen AF-Auswahl
JP3763560B2 (ja) * 1998-06-16 2006-04-05 パイオニア株式会社 受信機
DE19847018A1 (de) * 1998-10-13 2000-04-20 Bosch Gmbh Robert Verfahren zur Auswahl eines Rundfunkprogramms aus einem Hintergrundspeicher eines RDS-Rundfunkempfängers in logischer Folge
DE10049018B4 (de) * 2000-10-04 2004-04-01 Siemens Ag Betriebsverfahren für ein Empfangsgerät

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2208457B (en) * 1987-08-01 1992-03-25 Pioneer Electronic Corp Radio data system (rds) radio receiver
GB8719944D0 (en) * 1987-08-24 1987-09-30 British Broadcasting Corp Radio data system receivers

Also Published As

Publication number Publication date
DE59008829D1 (de) 1995-05-11
DE3928828A1 (de) 1991-03-07
EP0415132A3 (en) 1991-10-09
ATE120908T1 (de) 1995-04-15
EP0415132A2 (fr) 1991-03-06

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