EP0489247B1 - RDS-Rundfunkempfänger mit erweiterter Speicherkapazität zur Erfassung alternativer Frequenzen - Google Patents

RDS-Rundfunkempfänger mit erweiterter Speicherkapazität zur Erfassung alternativer Frequenzen Download PDF

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Publication number
EP0489247B1
EP0489247B1 EP91117802A EP91117802A EP0489247B1 EP 0489247 B1 EP0489247 B1 EP 0489247B1 EP 91117802 A EP91117802 A EP 91117802A EP 91117802 A EP91117802 A EP 91117802A EP 0489247 B1 EP0489247 B1 EP 0489247B1
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EP
European Patent Office
Prior art keywords
rds
memory
alternative
program
microprocessor
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
EP91117802A
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German (de)
English (en)
French (fr)
Other versions
EP0489247A3 (en
EP0489247A2 (de
Inventor
Gottfried Gundig E.M.V. Max Grundig Kagerbauer
Mathias Gundig E.M.V. Max Grundig Kalmer
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
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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 EP0489247A2 publication Critical patent/EP0489247A2/de
Publication of EP0489247A3 publication Critical patent/EP0489247A3/de
Application granted granted Critical
Publication of EP0489247B1 publication Critical patent/EP0489247B1/de
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    • 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
    • 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]

Definitions

  • the invention relates to an RDS radio receiver which has a program memory for the spontaneous call-up of various programs, in the individual memory levels of which a special program is assigned not only a mother frequency but also a large number of alternative frequencies.
  • the applicant's patent application P 39 20 220.8 discloses an RDS radio receiver, in particular an RDS car radio, in which the inventory of alternative frequencies in the program memory is expanded empirically as soon as new RDS transmitter frequencies are obtained during an operational or routine tuning of the receiver recognized as worthy of reception.
  • the program memory of an RDS car radio contains, over time, all that are worth receiving in the area of action of the motor vehicle Detected alternative frequencies of the different programs, so that when a program is called up spontaneously from home, alternative frequencies from the current reception area are immediately available for tuning the receiver without first having to start a search or waiting for the evaluation of the alternative frequencies transmitted by wave propagation .
  • microprocessor with integrated memories so-called one-chip microcomputer
  • the storage of a high number of alternative frequencies is difficult because of the limited memory capacity of such modules.
  • the RDS radio shown in FIG. 1 converts in a known manner the RF signals received by the antenna in the synthesizer tuner 1 into an intermediate frequency which is selectively amplified and demodulated in the IF amplifier 2.
  • the demodulated multiplex signal is broken down in the stereo decoder 3 into the two LF signals for the left and right stereo channels and these are fed to the two loudspeakers after amplification in the stereo amplifier 4.
  • a measurement variable for determining the signal field strength is taken from the IF amplifier 2 in accordance with the IF signal level and fed to the microprocessor 8a as a control signal via the level detector 5.
  • a control signal for the microprocessor 8a for detecting multipath reception interference is obtained from the multiplex signal via the multipath detector 6.
  • the multiplex signal is also fed into the RDS demodulator 7. After a 57 kHz bandpass filtering, this demodulates the quadrature-amplitude-modulated RDS signal and supplies the digital data obtained after biphase and differential decoding to the microprocessor 8a, which takes over the RDS data evaluation.
  • the microprocessor 8a generates the tuning signal for the synthesizer tuner 1 and controls the display 13 with which, among other things. the station names obtained from the PS code of the RDS data signal are displayed alphanumerically.
  • the microprocessor 8a receives its control commands for all manual operating functions from the operating part 12.
  • the operating program of the microprocessor 8a is fixed in the ROM memory 10.
  • the RAM memory 9 serves as a working memory which contains the PI code, data of the available alternative frequencies and the PS code for displaying the station name for the currently received program.
  • the data of different programs are stored in the individual memory levels 11a-11d of the EEPROM memory for an optional program call.
  • the basic composition of this data consisting of PI code, AF codes and PS code, corresponds to the configuration in the working memory 9.
  • the memory elements 9, 10, 11 shown as separate components together with the microprocessor 8a form the microcomputer 8. If all elements are integrated together on one chip, the unit is referred to as a one-chip microcomputer.
  • the use of such highly integrated components enables very inexpensive and compact device designs.
  • it is disadvantageous that due to the technological structure of the integrated circuit, only limited storage capacities can be realized. This disadvantage is particularly noticeable when alternative frequencies are stored in the program memory levels 11a-11d.
  • the data stored in the working memory 9 for a program currently being received is transmitted by a microprocessor 8a to one of the memory levels 11a-11d upon a key command.
  • the program data in the working memory 9 include, in addition to the PI code with a word length of 2 bytes, a series of data of alternative frequencies each with 1 byte (8 bit) word length and the PS code with a word length of 8 bytes. This corresponds to the data format with which the data transmitted via wave propagation in the RDS signal are supplied from the RDS decoder 7 to the microprocessor 8a.
  • the 8-bit wide frequency code is converted by the microprocessor 8a into a bit vector marked by 1 bit during the transfer from the working memory 9 into the program memory 11.
  • the 8-bit long AF codes identify channel numbers in the 100 kHz grid of the FM frequency range.
  • number binary code Carrier frequency 0 00000000 do not use 1 00000001 87.6 MHz 2nd 00000010 87.7 MHz . . . . . . . . 204 11001100 107.9 MHz
  • the first alternative frequency (out of a total of 26 possible) stored has, for example, the binary code 10001111, which means that the frequency in the 153rd channel of the 100 kHz wide channel grid lies between 87.5 and 108 MH, ie, a frequency of 102, 8 MHz corresponds.
  • the 153rd bit is activated in the AF memory area of the program memory 11a, ie, because the cells of the EEPROM memory have a high potential in the erased state, the 153rd bit is set to logic 0.
  • the remaining 207 bits remain at logic 1. This means that when the bit sequence is read out later in series, the 153rd channel can be determined again and the frequency of 102.8 MHz can be determined.
  • the AF codes are converted back into an 8-bit wide frequency code by the microprocessor 8a during the transfer into the working memory 9. This ensures that the data structure matches the AF data that also arrives in the RDS signal via wave propagation. Since the field strength available on site is immediately checked by briefly tuning the tuner 1 to the respective transmitter when the AFs are transferred to the working memory 9, only a limited selection of alternative frequencies reaches the working memory 9 from the program memory 11 The storage capacity in the working memory 9, reduced to 26 possible AFs, is not disadvantageously noticeable compared to the storage volume of a maximum of 208 AFs offered in the program storage levels 11a-11d.
  • the invention described above makes it possible to build up "unlimited lists" of alternative frequencies in the individual program memory levels, since all frequencies in the frequency range between 87.5 and 108 MHz can be stored with a predetermined channel grid of 100 kHz.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
EP91117802A 1990-12-04 1991-10-18 RDS-Rundfunkempfänger mit erweiterter Speicherkapazität zur Erfassung alternativer Frequenzen Expired - Lifetime EP0489247B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4038597A DE4038597A1 (de) 1990-12-04 1990-12-04 Rds-rundfunkempfaenger mit erweiterter speicherkapazitaet zur erfassung alternativer frequenzen
DE4038597 1990-12-04

Publications (3)

Publication Number Publication Date
EP0489247A2 EP0489247A2 (de) 1992-06-10
EP0489247A3 EP0489247A3 (en) 1993-03-03
EP0489247B1 true EP0489247B1 (de) 1997-05-02

Family

ID=6419539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91117802A Expired - Lifetime EP0489247B1 (de) 1990-12-04 1991-10-18 RDS-Rundfunkempfänger mit erweiterter Speicherkapazität zur Erfassung alternativer Frequenzen

Country Status (2)

Country Link
EP (1) EP0489247B1 (enrdf_load_stackoverflow)
DE (2) DE4038597A1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4239759C2 (de) * 1992-11-26 2001-08-16 Atmel Germany Gmbh Verfahren zum Umschalten auf eine empfangswürdige Alternativfrequenz eines RDS-Empfängers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3506161A1 (de) * 1985-02-22 1986-08-28 Blaupunkt-Werke Gmbh, 3200 Hildesheim Verfahren zur identifikation von rundfunksendern
DE3835870C1 (enrdf_load_stackoverflow) * 1988-10-21 1990-01-18 Blaupunkt-Werke Gmbh, 3200 Hildesheim, De
DE3917236C1 (enrdf_load_stackoverflow) * 1989-05-26 1990-08-02 Blaupunkt-Werke Gmbh, 3200 Hildesheim, De
DE3920220A1 (de) * 1989-06-21 1991-01-03 Grundig Emv Rds-rundfunkempfaenger mit empirisch wachsendem speicherinhalt seiner programmspeicher

Also Published As

Publication number Publication date
DE4038597A1 (de) 1992-06-11
DE59108692D1 (de) 1997-06-05
EP0489247A3 (en) 1993-03-03
DE4038597C2 (enrdf_load_stackoverflow) 1992-11-12
EP0489247A2 (de) 1992-06-10

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