EP0364749B1 - Rundfunkempfänger - Google Patents

Rundfunkempfänger 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
Authority
EP
European Patent Office
Prior art keywords
stage
memory
output
microprocessor
input
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.)
Revoked
Application number
EP89117351A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0364749A3 (de
EP0364749A2 (de
Inventor
Wilhelm Hegeler
Helmut Liman
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.)
Blaupunkt Werke GmbH
Original Assignee
Blaupunkt Werke 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.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6365613&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0364749(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Blaupunkt Werke GmbH filed Critical Blaupunkt Werke GmbH
Publication of EP0364749A2 publication Critical patent/EP0364749A2/de
Publication of EP0364749A3 publication Critical patent/EP0364749A3/de
Application granted granted Critical
Publication of EP0364749B1 publication Critical patent/EP0364749B1/de
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
EP89117351A 1988-10-21 1989-09-20 Rundfunkempfänger Revoked EP0364749B1 (de)

Applications Claiming Priority (2)

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

Publications (3)

Publication Number Publication Date
EP0364749A2 EP0364749A2 (de) 1990-04-25
EP0364749A3 EP0364749A3 (de) 1991-09-04
EP0364749B1 true EP0364749B1 (de) 1995-01-11

Family

ID=6365613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89117351A Revoked EP0364749B1 (de) 1988-10-21 1989-09-20 Rundfunkempfänger

Country Status (5)

Country Link
EP (1) EP0364749B1 (enrdf_load_stackoverflow)
JP (1) JPH02165715A (enrdf_load_stackoverflow)
AT (1) ATE117144T1 (enrdf_load_stackoverflow)
DE (2) DE3835870C1 (enrdf_load_stackoverflow)
ES (1) ES2068864T3 (enrdf_load_stackoverflow)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005413C2 (de) 1990-02-21 1993-12-16 Grundig Emv RDS-Rundfunkempfänger mit einer Einrichtung zum beschleunigten Auffinden alternativer Frequenzen
DE4024366C2 (de) * 1990-08-01 1993-12-09 Blaupunkt Werke Gmbh Autoradio mit einem Radiodatensignaldecoder
DE4038597A1 (de) * 1990-12-04 1992-06-11 Grundig Emv Rds-rundfunkempfaenger mit erweiterter speicherkapazitaet zur erfassung alternativer frequenzen
DE4103062C2 (de) * 1991-02-01 1994-03-31 Blaupunkt Werke Gmbh Rundfunkempfänger
DE4103779C2 (de) * 1991-02-08 1995-02-16 Blaupunkt Werke Gmbh RDS-Rundfunkempfänger
DE4135942A1 (de) * 1991-10-31 1993-05-06 Robert Bosch Gmbh, 7000 Stuttgart, De Rundfunkempfaenger, insbesondere fahrzeugempfaenger
DE4137000C2 (de) * 1991-11-11 1994-06-09 Opel Adam Ag Verfahren zur feldstärkeabhängigen Auswertung von Rundfunkinformationen für Fahrzeuge
DE4206475C1 (enrdf_load_stackoverflow) * 1992-03-02 1993-07-08 Blaupunkt-Werke Gmbh, 3200 Hildesheim, De
JPH05344015A (ja) * 1992-06-09 1993-12-24 Pioneer Electron Corp Ｒｄｓ受信機を含むオーディオ装置
DE19622432C2 (de) * 1996-06-04 1999-05-12 Rundfunkschutzrechte Ev Funkempfänger mit einem Stationsspeicher
DE19746960B4 (de) * 1997-10-24 2006-06-29 Robert Bosch Gmbh Verfahren zur Speicherung von Daten von Rundfunksendefrequenzen in einem Datenspeicher eines Rundfunkempfängers
DE19936114A1 (de) * 1999-07-31 2001-02-01 Bosch Gmbh Robert Verfahren und Anordnung zur Selektion von mit mindestens einem mobilen Empfänger empfangbaren Verkehrsinformationsdiensten

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3432848C2 (de) * 1984-09-07 1986-09-11 Institut Fuer Rundfunktechnik Gmbh, 8000 Muenchen Verfahren zum Übertragen einer digitalen Information
DE3448043C2 (de) * 1984-09-07 1987-01-15 Institut für Rundfunktechnik GmbH, 8000 München Verfahren zum Übertragen und Verarbeiten einer in einem Rundfunksignal enthaltenen digitalen Information
JP2571247B2 (ja) * 1988-01-07 1997-01-16 パイオニア株式会社 ラジオデータ受信機における受信周波数選択方法

Also Published As

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

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