EP0946011B1 - Empfänger für den Empfang von digitalen Tonrundfunkprogrammen und von UKW Rundfunkprogrammen mit Radiodatensignalen - Google Patents

Empfänger für den Empfang von digitalen Tonrundfunkprogrammen und von UKW Rundfunkprogrammen mit Radiodatensignalen Download PDF

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Publication number
EP0946011B1
EP0946011B1 EP19990301956 EP99301956A EP0946011B1 EP 0946011 B1 EP0946011 B1 EP 0946011B1 EP 19990301956 EP19990301956 EP 19990301956 EP 99301956 A EP99301956 A EP 99301956A EP 0946011 B1 EP0946011 B1 EP 0946011B1
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European Patent Office
Prior art keywords
dab
receiver
data
error rate
information
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Expired - Lifetime
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EP19990301956
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English (en)
French (fr)
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EP0946011A3 (de
EP0946011A2 (de
Inventor
Toshihito c/o Pioneer Elec. Corp. Ichikawa
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Pioneer Corp
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Pioneer Electronic Corp
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Priority to EP07113932A priority Critical patent/EP1850515A3/de
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Publication of EP0946011A3 publication Critical patent/EP0946011A3/de
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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
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • 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
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/20—Aspects of broadcast communication characterised by the type of broadcast system digital audio broadcasting [DAB]

Definitions

  • the present invention relates to a digital broadcast receiver, particularly to a receiver for receiving digital audio broadcast (DAB) which is already at a practical stage in Europe.
  • DAB digital audio broadcast
  • DAB digital audio broadcast
  • Fig. 5 shows an example of the configuration of service in the DAB system and shows a link among services constituting an ensemble 1 (three in Fig. 5 ), each component (six in Fig. 5 ) and an orthogonal frequency division multiplex (OFDM) signal actually transmitted from a DAB station.
  • an ensemble 1 three in Fig. 5
  • each component six in Fig. 5
  • OFDM orthogonal frequency division multiplex
  • Each subchannel (Subchannels 1 to 63) constituting MSC corresponds to the above each component, and the information of services available in the ensemble and information showing a link among services, components and subchannels are included in the FIC.
  • a function for following the service of a frequency-modulation (FM) station providing the same program can be given.
  • FM frequency-modulation
  • the information of an FM station broadcasting the same program as a program being received may be included in the FIC.
  • the identification information and the frequency information of an FM station broadcasting the same program are included.
  • the FM station broadcasting the same program can be detected by extracting the above information from FIC and controlling a radio data system (RDS) receiver based upon the information.
  • RDS radio data system
  • the receiving state of the DAB receiver is compared with that of the RDS receiver.
  • the reproduction output is switched to an audio output of the RDS receiver which receives an FM station broadcasting the same program. This function is called "service following". Thus, satisfactory audio reproduction can be maintained.
  • the bit rate of audio information and the protection level of transmission (1 to 5) can be defined in the FIC for each subchannel.
  • a protection level indicates strength against an error during transmission (as the larger a digit is, the higher an encoding rate is, redundancy becomes low and becomes weak for an error), and an encoding rate based upon convolutional encoding and the sampling of a part of a signal after encoding is defined according to a protection level.
  • an average code rate acquired based upon the bit rate of audio information and a protection level is defined so that it is between 0.34 and 0.75.
  • parameters such as receive field intensity and the strain component (the high-frequency component) of the phase detection output are already known.
  • a parameter such as an error rate calculated by comparing data before and after Viterbi decoder is used.
  • an optimum parameter in comparing the receiving state of a DAB signal and that of an FM signal is not definitely defined yet and room for examination and improvement is left.
  • US5584051A discloses a hybrid radio broadcast receiver capable of switching between digital and analogue (VHF, FM, AM) broadcast signals containing the same programming information. Switching is carried out based upon the result of a comparison of the bit error rate of the digitally coded radio signal to a predetermined (bit error rate) value.
  • an object of the present invention is to enhance the reliability of the result of comparison between the receive state of a DAB signal and that of an FM signal.
  • a digital broadcast receiver according to claim 1.
  • the digital broadcast receiver according to the first aspect of the invention further comprising calculation means for calculating the block error rate and the frame error rate wherein the number of blocks for calculating the block error rate and the number of frames for calculating the frame error rate are set to be equal.
  • Fig. 1 is a block diagram showing a digital broadcast receiver provided with an RDS receiver according to an embodiment of the present invention.
  • the above receiver is composed of a DAB receiver for receiving a digital broadcast, an FM receiver for receiving an RDS broadcast, a system controller 1, a switch 2, an amplifier 3, a speaker 4 and a memory 5.
  • the DAB receiver includes a front end for DAB (DAB-FE) 11 for tuning to a DAB station, an analog-to-digital (A/D) converter 12 for converting a received analog signal to a digital signal, a fast Fourier transform (FFT) circuit 13 for demodulating an OFDM wave, Viterbi decoder 14 for correcting an error, an audio decoder (a MUSICAM decoder) 15 for decoding compressed audio data (masking pattern adapted universal subband integrated coding and multiplexing (MUSICAM) data) to original audio data and others.
  • DAB DAB
  • A/D analog-to-digital
  • FFT fast Fourier transform
  • Viterbi decoder 14 for correcting an error
  • an audio decoder a MUSICAM decoder
  • MUSICAM decoder for decoding compressed audio data (masking pattern adapted universal subband integrated coding and multiplexing (MUSICAM) data) to original audio data and others.
  • MUSICAM universal subband integrated
  • the FM receiver includes a front end for FM (FM-FE) 21 for tuning to an FM station, an FM detector 22 for amplifying an intermediate frequency (IF) signal and detecting a composite signal from the IF signal, an RDS decoder 23 for extracting an RDS signal from the composite signal and demodulating it and others.
  • FM-FE FM-FE
  • IF intermediate frequency
  • RDS decoder 23 for extracting an RDS signal from the composite signal and demodulating it and others.
  • the FM receiver also outputs block error information of received RDS data to the system controller 1.
  • the system controller 1 controls the DAB receiver and the FM receiver, reads the FIC information from the DAB receiver and stores various information data included in such data in the memory 5.
  • Stored information includes the information of services available in an ensemble, information showing a link among services, components and subchannels, information related to FM stations such as PI code and frequency information (FI) list information and others.
  • the system controller 1 outputs a read PI code and read FI list information to FM-FE 21 and the RDS decoder 23 so that the FM receiver can receive a signal from a candidate station the service of which is followed.
  • the system controller 1 further controls the switch 2.
  • audio information reproduced by the DAB receiver is selectively output and if it is judged that the receiving state of the FM receiver is more satisfactory than that of the DAB receiver, audio information reproduced by the FM receiver is selectively output.
  • the output audio information is amplified by the amplifier 3 and output from the speaker 4.
  • Fig. 2 is a flowchart showing the operation of the system controller 1 in a service following mode. This flowchart shall be executed when an instruction to follow service from a user is input.
  • the system controller 1 judges whether the DAB receiver is currently tuned to any ensemble or not in step S1.
  • FIC data can be obtained if the DAB receiver is synchronized with any ensemble, the data is decoded. From the FIC data, the information of the protection level and the bit rate of each subchannel, the information of services available in the ensemble, information showing a link among services, components and subchannels, the information of PI code, FI list information and others out of the above data are extracted and stored in the memory 5 in step S2.
  • the system controller 1 calculates an error rate based upon each error information supplied from the DAB receiver and the FM receiver (step S4). A concrete method of calculating the error rate will be described later.
  • a reference value for evaluating the receiving state of the currently selected subchannel is selected from the corresponding table stored in the memory 5 based upon the information of the protection level of each subchannel acquired and stored in step S2 and the information of the actually currently selected subchannel.
  • Fig. 3 shows an example of a table stored in the memory 5.
  • the table is constituted corresponding to a protection level (PL) so that reference values corresponding to protection levels 1 to 5 which can be selected in DAB can be acquired.
  • PL protection level
  • a reference value 1 is defined as the corresponding criterion and is selected as a reference value to be compared.
  • step S5 the defined reference value and an error rate calculated this time are compared.
  • control is returned to the step S4, the error rate is again calculated based upon error information supplied at that time and is compared with the reference value in the step S5. Therefore, when the receiving state is satisfactory, control itinerates in a loop between the step S4 and the step S5.
  • step S5 As the receive state of the DAB station is deteriorated if it is judged in the step S5 that the error rate calculated this time is larger than the reference value as a result of comparison between the defined reference value and the error rate calculated this time, processing proceeds to step S6 and it is judged whether service to an RDS station broadcasting the same program can be followed or not.
  • a reference value for FM is set as in the step S5, is compared with the error rate of an FM-RDS station and it is judged whether there is an FM-RDS station which broadcasts the same program and the receiving state of which is more satisfactory than that of the DAB station or not.
  • the switch 2 is controlled to reproduce the audio information of the RDS station.
  • control is returned to the step S4 because service cannot be followed and the monitoring of the receiving states of both receivers is continued. For example, if the receiving state of the FM receiver becomes satisfactory during monitoring, it is judged in the step S6 that service can be followed and the switch 2 is controlled to reproduce the audio information of the RDS station.
  • the receiving state of a DAB station is evaluated in the step S5
  • an optimum reference value for evaluation is determined based on information related to a subchannel being currently selected and the deterioration of receiving state is judged based on the determined reference value.
  • an error rate detected in each receiver is used for a parameter for evaluating the receiving state of a DAB signal and an FM signal.
  • the receiving state of a signal from an RDS station received by the FM receiver is evaluated based upon the block error rate of the received RDS data and the receiving state of a signal from a DAB station received by the DAB receiver is judged based upon the frame error rate of audio data (MUSICAM data) transmitted via a subchannel in the received DAB data. This is based upon the following knowledge.
  • RDS is a transmission system in which it can be detected in units of block whether an error occurs or not and the length of one block is equivalent to 22 ms.
  • audio data in DAB complies with the layer 2 of Moving picture coding experts group (MPEG1), and the length of one frame is equivalent to 24 ms.
  • MPEG1 Moving picture coding experts group
  • information such as a DAB header, bit allocation information and ScFSI is allocated in the vicinity of the head portion.
  • a cyclic redundancy check (CRC) provided to detect the error of a DAB header, bit allocation information and ScFSI and CRC provided to detect the error of a scale factor are included in the above one frame. Therefore, it can be detected in units of frame (hereinafter called a block as in RDS data for the convenience of explanation) owing to such CRCs whether an error occurs or not.
  • block error rate of RDS data and heard noise of analog audio information are proportional and the block error rate of RDS and the receiving state of FM audio can be precisely related.
  • both error rates are calculated by the controller 1, however, each error rate may be also calculated respectively by the DAB receiver and the FM receiver.
  • the criterion for the evaluation of the receive state of a DAB station is changed based upon the protection level of a subchannel, however, the present invention is not limited to this and an optimum reference value may be also determined based upon the bit rate information of audio data transmitted via a subchannel.
  • each receiving state can be judged on an extremely close condition and the reliability of the result of comparison can be enhanced.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Claims (2)

  1. Digitaler Rundfunkempfänger, umfassend:
    einen UKW-Empfänger, zum Empfangen von UKW-Daten;
    einen RDS-Decoder (23) zum Dekodieren von in den UKW-Daten enthaltenen RDS-Daten;
    einen DAB-Empfänger zum Empfangen von DAB-Daten; und
    ein erstes Evaluierungsmittel (1) zum Evaluieren des Empfangsstatus des DAB-Empfängers basierend auf einem Vergleich der Rahmenfehlerrate von Audiorahmen, die in den DAB-Daten enthalten sind, mit einem Referenzwert;
    dadurch gekennzeichnet, dass das erste Evaluierungsmittel (1) den Referenzwert basierend auf Schutzniveau-Informationen (Protection Leve, PL), die in den DAB-Daten enthalten sind, ändert, und
    durch ein zweites Evaluierunsgmittel (1) zum Evaluieren des Empfangsstatus des UKW-Empfängers basierend auf einer Blockfehlerrate der RDS-Daten;
    ein Vergleichsmittel (1) zum Vergleichen der Rahmenfehlerrate von Audiorahmen, die in den DAB-Daten enthalten sind, mit der Blockfehlerrate der RDS-Daten; und
    ein Schaltmittel (2) zum Ausgeben von Informationen, die von dem UKW-Empfänger reproduziert werden oder Informationen, die von dem DAB-Empfänger reproduziert werden, basierend auf dem Vergleichsergebnis von dem Vergleichsmittel.
  2. Digitaler Rundfunkempfänger nach Anspruch 1, des Weiteren umfassend ein Berechnungsmittel (1) zum Berechnen der Blockfehlerrate und der Rahmenfehlerrate, wobei die Anzahl der Blöcke zum Berechnen der Blockfehlerrate und die Anzahl der Rahmen zum Berechnen der Rahmenfehlerrate gleich eingestellt werden.
EP19990301956 1998-03-23 1999-03-15 Empfänger für den Empfang von digitalen Tonrundfunkprogrammen und von UKW Rundfunkprogrammen mit Radiodatensignalen Expired - Lifetime EP0946011B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07113932A EP1850515A3 (de) 1998-03-23 1999-03-15 Digitaler Rundfunkempfänger

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9402298 1998-03-23
JP10094022A JPH11274958A (ja) 1998-03-23 1998-03-23 ディジタル放送受信機

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP07113932A Division EP1850515A3 (de) 1998-03-23 1999-03-15 Digitaler Rundfunkempfänger
EP07113932A Division-Into EP1850515A3 (de) 1998-03-23 1999-03-15 Digitaler Rundfunkempfänger

Publications (3)

Publication Number Publication Date
EP0946011A2 EP0946011A2 (de) 1999-09-29
EP0946011A3 EP0946011A3 (de) 2000-08-23
EP0946011B1 true EP0946011B1 (de) 2014-06-25

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EP19990301956 Expired - Lifetime EP0946011B1 (de) 1998-03-23 1999-03-15 Empfänger für den Empfang von digitalen Tonrundfunkprogrammen und von UKW Rundfunkprogrammen mit Radiodatensignalen
EP07113932A Withdrawn EP1850515A3 (de) 1998-03-23 1999-03-15 Digitaler Rundfunkempfänger

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP07113932A Withdrawn EP1850515A3 (de) 1998-03-23 1999-03-15 Digitaler Rundfunkempfänger

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JP (1) JPH11274958A (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3614301B2 (ja) * 1998-05-28 2005-01-26 パイオニア株式会社 ディジタル放送受信機
DE19956933A1 (de) * 1999-11-26 2001-06-21 Bosch Gmbh Robert Empfänger für analog und digital übertragene Rundfunkprogramme
JP4260328B2 (ja) * 2000-03-01 2009-04-30 クラリオン株式会社 放送受信装置
US6831907B2 (en) * 2001-08-31 2004-12-14 Ericsson Inc. Digital format U.S. commercial FM broadcast system
US7039437B2 (en) * 2001-09-17 2006-05-02 Nokia Corporation Internal broadcast reception system for mobile phones
DE10218679A1 (de) * 2002-04-26 2003-11-06 Bosch Gmbh Robert Verfahren und System zum Bereitstellen einer Umschaltempfehlung
US6980769B2 (en) 2003-05-19 2005-12-27 Visteon Global Technologies, Inc. Method for determining the validity of a radio station lookup table
US7043215B2 (en) 2003-05-19 2006-05-09 Visteon Global Technologies, Inc. Method of performing a fast tune for a digital broadcast station in a radio receiver
US6968164B2 (en) 2003-05-19 2005-11-22 Visteon Global Technologies, Inc. Method of controlling filter bandwidth in a radio receiver for a duplicative broadcast signal
NO345505B1 (en) * 2017-10-06 2021-03-15 Anywave As Radio channel identification device and method.
JP7042912B2 (ja) * 2018-07-13 2022-03-28 三菱電機株式会社 放送受信装置、及び放送受信方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3789959D1 (de) * 1986-12-19 1994-07-07 Telefunken Fernseh & Rundfunk Verfahren zum übertragen und/oder zum empfangsseitigen auswerten zusätzlicher informationen innerhalb eines rundfunksignals.
AU2892492A (en) * 1991-11-01 1993-06-07 Telefunken Fernseh Und Rundfunk Gmbh Radio transmission system and radio receiver
EP0865176A3 (de) * 1997-03-10 2004-09-01 Pioneer Electronic Corporation Rundfunkempfänger für den Empfang von digitalen Tonprogrammen bzw. den digitalen Zusatzdaten, die in den Tonprogrammen enthalten sind
DE19747055A1 (de) * 1997-10-27 1999-04-29 Bosch Gmbh Robert Rundfunkempfänger für DAB-Ausstrahlungen

Also Published As

Publication number Publication date
EP0946011A3 (de) 2000-08-23
JPH11274958A (ja) 1999-10-08
EP0946011A2 (de) 1999-09-29
EP1850515A3 (de) 2010-03-24
EP1850515A2 (de) 2007-10-31

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