EP1241814A1 - Récepteur de Radiodiffusion RDS-TMC et Procédé de Calibration d'une Horloge Interne d'un Récepteur de Radiodiffusion - Google Patents

Récepteur de Radiodiffusion RDS-TMC et Procédé de Calibration d'une Horloge Interne d'un Récepteur de Radiodiffusion Download PDF

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Publication number
EP1241814A1
EP1241814A1 EP01106302A EP01106302A EP1241814A1 EP 1241814 A1 EP1241814 A1 EP 1241814A1 EP 01106302 A EP01106302 A EP 01106302A EP 01106302 A EP01106302 A EP 01106302A EP 1241814 A1 EP1241814 A1 EP 1241814A1
Authority
EP
European Patent Office
Prior art keywords
rds
radio receiver
timer
tuner
tmc
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.)
Granted
Application number
EP01106302A
Other languages
German (de)
English (en)
Other versions
EP1241814B1 (fr
Inventor
Joris Geurts
Paul Moers
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.)
Siemens AG
Original Assignee
Siemens AG
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
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP01106302A priority Critical patent/EP1241814B1/fr
Priority to DE50110332T priority patent/DE50110332D1/de
Publication of EP1241814A1 publication Critical patent/EP1241814A1/fr
Application granted granted Critical
Publication of EP1241814B1 publication Critical patent/EP1241814B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G3/00—Producing timing pulses
    • G04G3/02—Circuits for deriving low frequency timing pulses from pulses of higher frequency
    • G04G3/022—Circuits for deriving low frequency timing pulses from pulses of higher frequency the desired number of pulses per unit of time being obtained by adding to or substracting from a pulse train one or more pulses
    • G—PHYSICS
    • G04—HOROLOGY
    • G04R—RADIO-CONTROLLED TIME-PIECES
    • G04R20/00—Setting the time according to the time information carried or implied by the radio signal
    • G04R20/20—Setting the time according to the time information carried or implied by the radio signal the radio signal being an AM/FM standard signal, e.g. RDS
    • G—PHYSICS
    • G04—HOROLOGY
    • G04R—RADIO-CONTROLLED TIME-PIECES
    • G04R40/00—Correcting the clock frequency
    • G04R40/06—Correcting the clock frequency by computing the time value implied by the radio signal
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/091—Traffic information broadcasting
    • G08G1/093—Data selection, e.g. prioritizing information, managing message queues, selecting the information to be output
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/55—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for traffic information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/13—Aspects of broadcast communication characterised by the type of broadcast system radio data system/radio broadcast data system [RDS/RBDS]

Definitions

  • the invention relates to a method for calibrating an internal timer in a radio receiver that is used to receive and evaluate at intervals received external time data signals is designed. Furthermore concerns the invention a radio receiver for the reception of RDS-TMC data, one tuner, one RDS decoder connected to the tuner, one Has timer and a central control unit that works with the RDS decoder is connected, wherein the timer from the central control unit with RDS time data signals can be synchronized and by the control unit Inclusion of the timer signal time window can be set, within which the radio receiver is ready to receive RDS-TMC data.
  • RDS Radio Data System
  • the Functionality of radio receivers and in particular car radios can be increased significantly.
  • RDS is a standardized one Procedure for transferring data from broadcasters to one Radio receiver.
  • the transmitted data includes, for example, information about alternative frequencies (AF), the name of the broadcaster (PS), the program type (PTY), the marking of a traffic announcement (TA) or the transmission of a date and time coding (CT).
  • AF alternative frequencies
  • PS the name of the broadcaster
  • PTY program type
  • TA marking of a traffic announcement
  • CT date and time coding
  • the RDS standard is laid down in the international standard IEC 62106.
  • RDS-TMC Traffic Message Channel
  • the RDS-TMC standard is among others in the European pre-standard ENV 12313-1.
  • An RDS-TMC radio receiver must perform various functions which includes in particular the search for alternative frequencies. For this the tuner of the radio receiver must briefly switch to these alternatives Frequencies are set to check the reception quality. At the same time, however, it must be ensured that during these switching phases missed any traffic reports on another frequency become.
  • the standard mentioned provides that the Transmission of traffic information only within a defined time window he follows. By correspondingly synchronizing these time windows with the test procedures the desired goal can be achieved at alternative frequencies.
  • TMC enhanced mode every minute is converted into an integer number of Time ranges disassembled. Each of these time periods is again divided into sub-areas divided in which traffic reports broadcast or not broadcast become. In the time periods in which no traffic reports are transmitted can then be switched to alternative transmission frequencies for a short time be performed.
  • a second object of the invention is a Method for receiving RDS-TMC data with a radio receiver to indicate that a higher reliability when receiving coded TMC traffic data can be expected in the so-called TMC enhanced mode.
  • a third task is ultimately a radio receiver for the Specify receipt of RDS-TMC data that work in TMC enhanced mode can and in which it is ensured that that of the radio receiver set time window with high accuracy with the standard or match the time slots set by the radio broadcaster.
  • the first-mentioned object is achieved by a method for calibrating a internal timer in a radio receiver that is used to receive and for evaluating external time data signals received at intervals is designed, with the aid of the timer a first duration value between the reception of two time data signals is determined and the first duration value is compared with an expected duration value from the comparison a calibration factor is determined for the internal timer and the internal one Timer is calibrated with the calibration factor.
  • the time data signal received at intervals is in particular the RDS-CT signal of an RDS data transmitter with which a date and Time coding is transmitted.
  • This CT signal is from the broadcasters sent periodically, according to the currently applicable standard a minute cycle is provided.
  • a first duration value based on the internal timer signal of the radio receiver to be determined, the first duration value the time between reception as measured by the timer of two CT signals.
  • the duration value thus determined is now compared to an expected duration value, whereby the deviation of the internal timer can be determined from the external time data signals.
  • These external time data signals are decisive for the classification the time window for receiving TMC messages.
  • a calibration factor for the internal timer is determined for comparison and the internal timer is calibrated with this calibration factor. This ensures that even in the period between receipt of two external CT signals the internal timer with the time specifications of the RDS station is correlated.
  • the internal timer is advantageously added periodically synchronized with the external CT signal.
  • the expected duration value can be the difference between the two received CT time codes can be determined.
  • the expected duration value can be a saved one Act worth.
  • a first embodiment it is provided that two immediately following one another Time data signals (CT signals) for determining the calibration factor be used.
  • CT signals Time data signals
  • This embodiment is particularly simple feasible because two consecutive time data signals are used directly come.
  • a certain disadvantage is that the length of time between two consecutive CT signals with a minute relatively low is. This limits the accuracy of the calibration factor determined.
  • two are therefore not immediately provided successive time data signals for determining the calibration factor to use. This allows a longer period for determining the Calibration factor selected and thus its accuracy can be increased.
  • the determination of the calibration factor is general the more precise the longer the underlying period is.
  • the calibration factor periodically determined anew.
  • any time between two successive CT signals to determine a new calibration factor be used. In practical cases, however, this is usually the case not be necessary as changes in the accuracy of the internal timer, for example due to temperature changes, rather slowly respectively.
  • the second object is achieved by a method for receiving RDS-TMC data with a radio receiver that has a tuner, one with the RDS decoder connected to the tuner, a timer and a central control unit has RDS-TMC data from the RDS decoder and periodically Contains time data signals with which the timer from the central control unit is synchronized, with the control unit including the Timing signal time window are set, within which the radio receiver is ready to receive new RDS-TMC data, according to the invention the timer is additionally calibrated with the help of the time data signals becomes.
  • the third task is performed by a generic radio receiver solved, according to the invention means for calibrating the timer with the help which contains RDS time data signals.
  • the calibration of the timer can be carried out in particular according to the aforementioned methods.
  • the radio receiver has at least two tuners, so that a tuner for receiving TMC data and testing alternative transmission frequencies can be used while another tuner for the Reception of the radio program is provided. Thus short-term Interruptions in radio reception to check alternative frequencies avoided.
  • FIG. 1 shows a simplified block diagram of a radio receiver, in particular a car radio, with two tuners, namely an audio tuner 1 and a data tuner 2.
  • the tuners 1, 2 receive their input signals from an antenna 3. Both tuners 1, 2 each generate a multiplex signal MPX.
  • the MPX signal of the data tuner 2 is fed to an RDS decoder 5.
  • the module referred to here as the RDS decoder 5 can in particular be a known one Pre-processor, for example of the type SAA6588, the other Takes on tasks.
  • the output signal of the audio tuner 1 becomes one Sound processor 6 fed, which also receives input signals from other audio sources such as a CD player, a cassette player or a phone.
  • the audio signals generated by the sound processor 6 are fed to an amplifier 7, which amplifies them to speakers 8 passes through which the audio signals are output.
  • the output signals of the RDS decoder 5 are a central control unit 9 fed, which takes over the preparation of the RDS information.
  • the Control unit 9 is also with input / output units, not shown (e.g. keyboard, display) connected.
  • input / output units not shown (e.g. keyboard, display) connected.
  • Such a radio receiver is known and the individual components can be built with standard components.
  • the data tuner 2 can also be accommodated in a separate additional device be, for example, acquired as a retrofit device and with the actual Car radio (for audio operation), which itself has the audio tuner 1, connected becomes.
  • a separate additional device be, for example, acquired as a retrofit device and with the actual Car radio (for audio operation), which itself has the audio tuner 1, connected becomes.
  • Such an additional device with data tuner 2 is thus also a radio receiver, in which the calibration of an internal timer is carried out can be.
  • Radio receiver essentially in connection with a data tuner 2 explained.
  • the then only tuner in particular will work as data tuner 2 if no audio playback or another audio source (CD, cassette or the like) is played.
  • the only tuner can then run all functions described below can be used like the data tuner 2 of the two-tuner receiver according to FIG. 1.
  • FIG. 2 shows the data tuner 2, the RDS decoder 5 and the central control unit 9 shown in more detail.
  • the signal received by the antenna 3 is the data tuner 2, which supplies the RDS decoder 5 with the multiplex signal MPX supplied.
  • From the RDS decoder 5 an RDS clock signal and RDS data signals of an input / output interface 10 of the central control unit 9 fed.
  • the input / output interface 10 is with a CPU 11 connected.
  • the CPU 11 thus receives the RDS data and can evaluate it.
  • the RDS data supplied to the CPU 11 includes the CT signal, which contains a date and time coding, especially every minute Will be received.
  • the CPU 11 has a working memory 12 and a permanent memory 13 connected. Furthermore, the CPU 11 is connected to a timer register 14, which in turn receives signals from an oscillator 15.
  • the oscillator 15 forms with parts of the central control unit 9 an internal timer. To do this the periodic clock signals of the oscillator 15 in the timer register 14 stored and can by the CPU 11 according to a predetermined algorithm can be converted into time signals.
  • the method according to the invention is essentially in the form of a program in the central control unit implemented.
  • FIG. 3 shows a process sequence for determining the calibration factor within the inventive method.
  • the program sequence starts in Step S1.
  • step S2 it is subsequently checked whether an RDS-CT signal is received which contains the time and date coding according to the RDS standard. If this is not the case, a waiting loop is run through in step S3. If an RDS-CT signal was received, then in step S4 internal timer register 14, which is connected to the internal oscillator 15, read out and the read out value is stored in the working memory 12. It is then checked again in step S5 whether another RDS-CT signal was received. If this is not the case, then step S6 in turn to be on hold. If another RDS-CT signal is received, the current value of the timer register 14 is read out in step S7 and stored in the working memory 12. Then in step S8 timer register value previously stored in the working memory in step S4.
  • step S9 is read from the two in steps S4 and S7 Timer register values formed a difference that is a first duration value represents.
  • This first time duration value corresponds to the time duration between two received RDS-CT signals as determined by the internal timer has been.
  • the expected duration value is then between the reception of the two RDS-CT signals in steps S2 and S5.
  • a fixed, predetermined value for the duration between two received RDS-CT signals of one minute or a multiple of one minute or this expected value can be taken directly from the received RDS-CT signals are calculated in accordance with steps S2 and S5, if these are also stored in the working memory.
  • step S11 the calibration factor is determined by dividing the in Step S9 determined duration value and the expected in step S10 expected Duration value is made. This results in a calibration factor which is stored in the working memory 12.
  • FIG. 4 shows the procedure for calibrating the internal timer.
  • the method starts in step S20. Then the current one in step S21 The value of the timer register 14 is read out and stored in the working memory 12. Then, the read-out timer value becomes in step S22 using a predefined conversion formula in hours, minutes and seconds converted.
  • step S23 the method described in FIG. 3 is used certain calibration factor is read from the working memory 12 and the time determined in step S22 is corrected with the calibration factor. This makes a high regardless of the accuracy of the oscillator 15 Accuracy of the internally determined time reached. In particular, the internally determined Time always correlated with the time according to the RDS-CT signal, even if this is not received.
  • the method according to the invention is used to calibrate the internal one Timer in particular for procedures or radio receivers for Receiving RDS-TMC data in the so-called TMC enhanced mode.
  • enhanced mode becomes the length of time between the receipt of two CT signals CT1 or CT2, which corresponds to one minute, are divided into equally long time segments.
  • FIG. 3a six time segments A, B, C, D, E and F are provided.
  • Each of these periods is in turn in subsections Ta and Tw divided, which a delay section Td may be preceded (Fig. 3b). All transmitted according to the TMC standard Traffic information should start within a time period Ta. she can, however, be ended outside the time period Ta.
EP01106302A 2001-03-15 2001-03-15 Récepteur de Radiodiffusion RDS-TMC et Procédé de Calibration d'une Horloge Interne d'un Récepteur de Radiodiffusion Expired - Lifetime EP1241814B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP01106302A EP1241814B1 (fr) 2001-03-15 2001-03-15 Récepteur de Radiodiffusion RDS-TMC et Procédé de Calibration d'une Horloge Interne d'un Récepteur de Radiodiffusion
DE50110332T DE50110332D1 (de) 2001-03-15 2001-03-15 RDS-TMC-Rundfunkempfänger und Verfahren zum Kalibrieren eines internen Zeitgebers in einem Rundfunkempfänger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01106302A EP1241814B1 (fr) 2001-03-15 2001-03-15 Récepteur de Radiodiffusion RDS-TMC et Procédé de Calibration d'une Horloge Interne d'un Récepteur de Radiodiffusion

Publications (2)

Publication Number Publication Date
EP1241814A1 true EP1241814A1 (fr) 2002-09-18
EP1241814B1 EP1241814B1 (fr) 2006-06-28

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EP01106302A Expired - Lifetime EP1241814B1 (fr) 2001-03-15 2001-03-15 Récepteur de Radiodiffusion RDS-TMC et Procédé de Calibration d'une Horloge Interne d'un Récepteur de Radiodiffusion

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EP (1) EP1241814B1 (fr)
DE (1) DE50110332D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1571757A1 (fr) * 2004-03-04 2005-09-07 Harman/Becker Automotive Systems GmbH Processeur pour récepteurs radio FM
WO2008068085A1 (fr) * 2006-12-05 2008-06-12 Robert Bosch Gmbh Procédé pour l'utilisation d'un appareil de navigation et appareil de navigation réalisé en conséquence
EP1416579B1 (fr) * 2002-10-31 2012-09-12 Kia Motors Corporation Antenne intégrée pour vitre de véhicule automobile
DE112009001277B4 (de) * 2008-07-07 2014-02-13 Mitsubishi Electric Corp. Empfangsvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4036851A1 (de) * 1989-11-20 1991-05-23 Pioneer Electronic Corp Empfaenger
DE4029583A1 (de) * 1990-05-03 1991-11-14 Huber Franz F Dipl Ing Fh Bordgeraet und verfahren zum aufzeichnen und wiedergeben von verkehrsfunk-durchsagen sowie verwendung eines hilfsempfaenger-systems
GB2251767A (en) * 1990-10-25 1992-07-15 British Broadcasting Corp Multichannel operation of rds
WO1998006021A1 (fr) * 1996-08-08 1998-02-12 Tandem Computers Incorporated Procede maintenant l'heure exacte dans un systeme informatique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4036851A1 (de) * 1989-11-20 1991-05-23 Pioneer Electronic Corp Empfaenger
DE4029583A1 (de) * 1990-05-03 1991-11-14 Huber Franz F Dipl Ing Fh Bordgeraet und verfahren zum aufzeichnen und wiedergeben von verkehrsfunk-durchsagen sowie verwendung eines hilfsempfaenger-systems
GB2251767A (en) * 1990-10-25 1992-07-15 British Broadcasting Corp Multichannel operation of rds
WO1998006021A1 (fr) * 1996-08-08 1998-02-12 Tandem Computers Incorporated Procede maintenant l'heure exacte dans un systeme informatique

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1416579B1 (fr) * 2002-10-31 2012-09-12 Kia Motors Corporation Antenne intégrée pour vitre de véhicule automobile
EP1571757A1 (fr) * 2004-03-04 2005-09-07 Harman/Becker Automotive Systems GmbH Processeur pour récepteurs radio FM
US8229034B2 (en) 2004-03-04 2012-07-24 Harman Becker Automotive Systems Gmbh FM radio receiver processing system
WO2008068085A1 (fr) * 2006-12-05 2008-06-12 Robert Bosch Gmbh Procédé pour l'utilisation d'un appareil de navigation et appareil de navigation réalisé en conséquence
DE112009001277B4 (de) * 2008-07-07 2014-02-13 Mitsubishi Electric Corp. Empfangsvorrichtung

Also Published As

Publication number Publication date
EP1241814B1 (fr) 2006-06-28
DE50110332D1 (de) 2006-08-10

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