EP1784934B1 - Procede et dispositif pour transmettre des donnees supplementaires relatives a des frequences d'emission numeriques alternatives, dans un systeme de transmission radio analogique - Google Patents

Procede et dispositif pour transmettre des donnees supplementaires relatives a des frequences d'emission numeriques alternatives, dans un systeme de transmission radio analogique Download PDF

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Publication number
EP1784934B1
EP1784934B1 EP05753998A EP05753998A EP1784934B1 EP 1784934 B1 EP1784934 B1 EP 1784934B1 EP 05753998 A EP05753998 A EP 05753998A EP 05753998 A EP05753998 A EP 05753998A EP 1784934 B1 EP1784934 B1 EP 1784934B1
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Prior art keywords
amds
data
transmitted
sdc
group
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EP05753998A
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German (de)
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EP1784934A1 (fr
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Thomas Lauterbach
Frank Hofmann
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H04H20/36—Arrangements for simultaneous broadcast of plural pieces of information for AM broadcasts
    • 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

Definitions

  • the present invention relates to a method and a device for transmitting additional data in an analog radio transmission system, the additional data containing information regarding alternative transmission frequencies of the respective program, and the alternative transmission frequencies relating to digital radio transmission systems.
  • the alternative transmission frequencies for digital broadcasting systems are transmitted in AMDS (Amplitude Modulation Data System) format by mapping these SDC (Service Description Channel) data into AMDS format by mapping.
  • AMDS Amplitude Modulation Data System
  • a digital broadcasting system which transmits, for example, on conventional AM frequencies and has, inter alia, a Service Description Channel (SDC), which is described on pages 63 to 78 as Chapter 6.4.
  • SDC Service Description Channel
  • the data is divided into SDC blocks and transmitted. Each block contains an indicator called the AFS index, a data field that allows payload data to be transferred, and a checkword used for error detection and error correction.
  • the AFS index here is an unsigned binary number between 0 and 15, which indicates the number of transmissions of so-called superframes, which separates this SDC block from the next, with identical content, if in the Identification field of the Fast Accsess Channel
  • the 0-symobl is set
  • the AFS index should be identical for all SDC blocks and can be changed, for example, during a reconfiguration.
  • the data field is divided into a variable number of data entities. This can include an end marker as well as padding bits that fill in empty fields. The length of this data field depends on the selected transmission mode, which determines the robustness of the transmission system.
  • the check field also known as Cyclic Redundancy Check (CRC), contains a 16-bit long CRC data word, which is calculated using the AFS index and the data field.
  • CRC Cyclic Redundancy Check
  • DAB Digital Audio Broadcasting
  • VHF / FM Broadcasting crossreferencing to simulcast DAB services by RDS-ODA 147 ", ETSI EN 301 700, published in March 2000 by the European Telecommunications Standards Institute , Sophia Antipolis and the publication " Digital Audio Broadcasting - coming out of the tunnel "by F. Kozamernik, issued on March 21, 1999 by the EBU European Broadcasting Union each show a method according to the preamble of independent claim 1.
  • the core of the present invention is to provide a method and a device with which in an analog radio transmission system alternative frequencies of the currently set transmitter can be transmitted, wherein these alternative transmission frequencies may refer to the same frequency band, but refer to a digital Rundfunkuberhngungsungssystem, in particular Digital Radio Musice (DRM).
  • DRM Digital Radio Mondiale
  • DAB Digital Audio Broadcast
  • DRM Digital Radio Mondiale
  • DVB-T Digital Video Broadcast - Terrestrial
  • IBOC In Band On Channel
  • UMTS Universal Mobile Telecommunications System
  • the so-called Service Description Channel is provided by means of which additional data can be transmitted.
  • This SDC data received from a combination receiver, d. H. from a receiver that can receive both analog AM signals and digital DRM signals, can be evaluated by this without additional effort. Therefore, it is provided to transmit data by means of the SDC format, which are however transmitted for transmission in analog broadcast transmission systems in the so-called AMDS format by means of mapping.
  • the AFS index of the SDC blocks is taken over into the data fields of the AMDS blocks. Furthermore, it is advantageous that the Bits of the test field of each AMDS group are generated from the data fields of the acquired SDC data blocks.
  • the AMDS blocks are consecutively numbered by means of a counter. It is particularly advantageous that the consecutive numbering of each AMDS group is contained in one or more reserved AMDS data bits.
  • the one or more reserved AMDS data bits which contain the consecutive numbering of each AMDS group, are the data bits following the first data bit m35 of the first AMDS block of an AMDS group, that is, the data bits m34, m33, m32, ..., depending on how many bits are needed for the counter.
  • the consecutive numbering of each AMDS group is contained in an AMDS data field reserved for this, which consists of several reserved AMDS data bits. Furthermore, it is advantageous that the consecutive numbering of the AMDS groups is carried out by means of synchronization by calculating the content of the test fields by cyclic block codes from the content of the data fields, adding offset pairs to the test fields, calculating pairwise syndromes from the offset values and that the respective content of the AMDS groups can be determined on the basis of the pairwise syndromes obtained. Furthermore, it is advantageous that the device contains a calculation device that determines test words for error detection and error correction as a function of the information contained in the AMDS data field and inserts them into the test fields of the AMDS test fields.
  • the device has a counter which consecutively numbers the AMDS blocks and inserts the numbering in an AMDS data field reserved for this purpose.
  • a receiver for receiving and reproducing analog and digitally transmitted broadcasting signals, wherein the receiver, upon reproduction of an analog broadcasting signal, receives the additional data transmitted in AMDS format with respect to alternative broadcasting frequencies on which the same program is digitally transmitted; evaluates and in the presence of alternative transmission frequencies on which the same program is transmitted digitally, automatically switches to the digitally transmitted alternative frequency.
  • the receiver stores all received additional data relating to alternative transmission frequencies in a database and selects from this database the alternative frequency at which the set radio program is best received.
  • the undesirable frequencies are searched in a predetermined order for their type of interrogation, in particular in the order DAB, DRM, FM, AM.
  • FIG. 1 the structure of the Amplitude Modulation Data System is shown schematically.
  • An AMDS group 1 consists of 94 bits, this AMDS group being equally divided into an AMDS block 1 2 and an AMDS block 2 2 of 47 bits each.
  • Such a 47-bit AMDS block 2 is further subdivided into a data field 3 with 36 bits and a test field 4 with 11 bits, wherein the data field transmits the payload and the test field 4 contains a check word which is output from the data field 3 by means of a cyclic code is calculated and used for error detection and error correction.
  • the 36-bit data field 3 is further subdivided into AMDS data bits 5, which begin with the designation m35 and are named up to m00, the last AMDS data bit of the user data.
  • the test field 4 which consists of 11 AMDS check bits 6, which are numbered beginning with c10 to c00.
  • This test field 4 contains information which has been calculated from the data field 3 by means of a cyclic block code.
  • FIG. 2 the structure of a Short Description Channel (SDC) block is shown, as used in the digital broadcasting system DRM (Digital Radio Mondiale).
  • SDC Short Description Channel
  • information is transmitted that, for example, refers to alternative frequencies of the same program, so that when receiving quality degradation of the currently tuned radio program another frequency of the same or a different frequency band can be specified, which currently transmits the same program.
  • the digital radio program is also able to refer to either alternative digital frequencies or frequencies at which the same program is transmitted by means of analog broadcast transmission methods such as FM or AM.
  • analog broadcast transmission methods such as FM or AM.
  • the same radio programs will have to be broadcast both in analog and digital form, since not every listener has a digital receiver.
  • the SDC block 7 consists of an AFS index 8 consisting of 4 bits.
  • AFS index 8 consisting of 4 bits.
  • a data field 9 is transmitted, which can be variable in length and which transmits the user data.
  • the data field 9 from different numbers of data blocks 11, which are numbered from 1 to N, consist, depending on which transmission mode and which SDC mode is currently being sent.
  • the data field 9 is followed, within the SDC block 7, by a check word 10 which consists of 16 bits and is also referred to as CRC (cyclic redundancy check). This check word 10 is calculated from the bits of the AFS index and the data field and is used for error detection and error correction of the transmitted data.
  • CRC cyclic redundancy check
  • the SDC blocks such as those transmitted in the DRM system, are juxtaposed with the AMDS data structure to represent the mapping for transmitting the SDC data in AMDS format.
  • the SDC blocks 7 are sent consecutively for this purpose.
  • Each SDC block 7 here consists of an AFS index 8, followed by 1 to N data blocks 11, which contain the payload.
  • the SDC block 7 contains padding bits 12 and a 16-bit long cyclic redundancy check word 13.
  • the AFS index information in block 8 and the information of the data blocks 1 to N 11 in the AMDS data structure taken over, with the Paddingbits 12 and the CRC bits 13 are disregarded.
  • each AMDS group 1 Since one AMDS group 1 each contains two 47-bit AMDS blocks, each AMDS group has payload bits m35 to m00, followed by 11 AMDS check bits c10 to c00 and once again for the AMDS block 36 payload bits m35 to m00 as well 11 primitives of the AMDS block 2 c10 to c00. Since the first payload bit m35 of the first block of the AMDS Gurppe 1 is reserved to indicate the beginning of an SDC block or to continue the SDC block, the first AMDS payload bit m35 of the block 1 of an AMDS group 1 does not become SDC Data described. The information of the AFS index 8 is therefore written in the AMDS data bits m34 and following of the first AMDS block of the AMDS group 1.
  • the data blocks 1 to N 11 following the AFS index 8 are continuously written into the AMDS data bits 5, for which purpose the AMDS data bits m34 to m00 of the AMDS block 1 and the AMDS data bits m35 to m00 of the AMDS block 2 are available stand.
  • These AMDS data bits are interrupted by the AMDS Prütbits c10 to c00, which are each calculated and written in response to the preceding AMDS data bits. Since it is not possible from the data scope of an SDC block, the user data of an SDC block completely into an AMDS group, several AMDS groups 1 are hung one after the other until the complete payload of an SDC block is accommodated in AMDS groups 1.
  • the first AMDS data bit m35 of the first AMDS block can be used by setting the m35 bit of this first AMDS block of an AMDS group to 1, if it is the first AMDS group that starts the AMDS group Contains user data of an SDC block or by setting the m35 bit of the first AMDS block of an AMDS group to 0 to indicate that this AMDS group is a continuation of a previous AMDS group concerning the same SDC block ,
  • the check bits c10 to c00 6 of the AMDS groups 1 are calculated and transmitted as a function of the preceding useful bits m35 to m00. Furthermore, it makes sense to number the AMDS groups, since a transmission in the AM band is frequently disturbed and therefore multiple transmission of the AMDS groups in succession is advantageous.
  • the AMDS groups By numbering the AMDS groups, it is possible to determine which AMDS groups that were transmitted consecutively with the same content belong together and from which AMDS group new information is transmitted. That the receiver can recognize the repetitions, or recognize when a new AMDS group is sent, it is also advantageous that a continuous counter is provided. In this case, the AMDS groups containing the same information can also be transmitted several times and possibly at intervals, which advantageously requires a 3 or 4 bit counter.
  • FIG. 4 is such a counter shown in which an AMDS group 1 is shown, which consists of two consecutive AMDS blocks, each AMDS block of useful bits m35 to m00 and then subsequently from the check bits c10 to c00 exists. Since the first data bit of the first AMDS block of the AMDS group 1 (m35) is reserved to indicate the beginning or continuation of an SDC block, the subsequent 3 bits or 4 bits, namely, the bits m34 to m32 and m34, respectively to m31 of the first AMDS block of the AMDS group for an AMDS group counter so that the AMDS useful bits m31 to m00 or m30 to m00 of the first AMDS block and the data bits m35 to m00 of the second AMDS block of the AMDS group are available for the actual information of the payload bits m34 to m32 of the first AMDS block can be advantageously started with a 0 symbol to indicate the beginning of an SDC block.
  • the following AMDS groups contain incremented counter symbols to detect when
  • the counter implicitly with the synchronization mechanism by additionally defining pairs of offset words, the number of offset word pairs corresponding to the number of groups the counter is to distinguish.
  • the offset word pairs are added in the receiver to the test words of the two blocks that make up an AMDS group. Groups with the same content use the same offset word pairs.
  • the received bitstream is fed to the decoder in blocks of 47 bits each and a syndrome is calculated. Then the block division is shifted by one bit and the syndrome of the new code word thus created is calculated again. When the first syndrome of a syndrome pair occurs, the next 47-bit block is fed to the decoder. When the second syndrome of the syndrome pair arises, synchronization is achieved.
  • the corresponding offset words are then added and the blocks are fed to the decoder.
  • syndrome 0 occurs, the block is error free and can be decoded. It should be noted that in successive blocks each a related pair of offset words is used. If the synchronization has taken place, then in the following block each of the first offset words of the offset word pairs must be added until a decoding with syndrome 0 is possible. Then the next following block with the associated second offset word of the offset word pair can be decoded.
  • FIG. 5 a schematic block diagram of a device according to the invention is shown.
  • the mapping device 14 SDC blocks are supplied for this purpose, which are output after processing as AMDS groups.
  • the SDC blocks supplied to the mapping device 14 enter a truncation device 15 in which the padding bits 12 and the check bits (CRC) 13 of the SDC blocks are removed. Thereafter, the output of the cutter 15 a strigbitein Stahl 16 supplied.
  • CRC check bits
  • the output signal of the clipping device 15 is fed to a check bit calculator 17 in which check bits c10 to c00 are respectively calculated from the AMDS data fields m35 to m00 which are fed to the check bit inserter 16 which supplies the calculated check bits c10 to c00 of the test field 4 to the designated ones Places of the AMDS block are inserted.
  • the output of the check bit inserter 16 is passed to the counter fuser 18.
  • the counter inserter 18 is supplied with signals to a counter 19, which numbers the individual AMDS blocks and feeds this number to the counter inserter 18, which inserts them into the payload first payload bits of the first block of an AMDS group, ie in the case of a 3-bit counter at the positions m34 to m32 of the first block. If a 4-bit counter is used, bits m34 to m31 of the first block of an AMDS group are used for this purpose.
  • the first payload bit m35 of the block 1 of an AMDS group is set to 0 if this AMDS group contains the beginning of a new SDC block, or the m35 bit of the first block of the AMDS group becomes 0 is set if this AMDS group is a continuation of the information of an SDC block of a preceding AMDS group

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  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Claims (14)

  1. Procédé de transmission de données supplémentaires dans un système de radiodiffusion analogique (AM), les données supplémentaires contenant des informations relatives à des fréquences d'émission alternatives du programme correspondant, les fréquences d'émission alternatives concernant des systèmes de radiodiffusion numériques et les fréquences d'émission alternatives étant transmises pour des systèmes de radiodiffusion numériques (DRM, DAB, iBiquity, IBOC, UMTS) dans un format AMDS, Amplitude Modulation Data System - Système de données à modulation d'amplitude, conformément à la Recommandation de l'UIT BS.706-2 (1, 2, 3, 4, 5, 6), par le fait que les données transmises au format AMDS (1, 2, 3, 4, 5, 6) sont des données SDC, Service Description Channel - Canal de description de service, conformément au document de l'ETSI TS 101 980 (7, 8, 9, 10, 11, 12), lesquelles sont transmises au format AMDS au moyen d'une mise en correspondance par le fait que les blocs de données (11) des informations SDC sont repris dans des parties des champs de données (3) des blocs AMDS (2) et un bit de données (5) de chaque groupe AMDS (1) indique s'il s'agit du premier groupe AMDS (1) ou d'un groupe suivant d'une pluralité de groupes AMDS (1) transmis les uns derrière les autres et qui contiennent ensemble l'information d'un bloc SDC (7), caractérisé en ce que le premier bit de données (m35 du bloc 1) du premier bloc AMDS (2) de chaque groupe AMDS (1) indique s'il s'agit du premier (m35=1) groupe AMDS (1) ou d'un groupe suivant (m35=0) d'une pluralité de groupes AMDS (1) transmis les uns derrière les autres et qui contiennent ensemble l'information d'un bloc SDC (7).
  2. Procédé selon la revendication 1, caractérisé en ce que le système de radiodiffusion numérique est émis au format DAB (Digital Audio Broadcast - Radiodiffusion audionumérique) ou au format DRM (Digital Radio Mondiale - Système mondial de radiodiffusion numérique) (7, 8, 9, 10, 11, 12) ou au format DVB-T (Digital Video Broadcast, Terrestrial - Radiodiffusion vidéonumérique terrestre) ou au format iBiquity ou au format IBOC (In Band On Channel - Même bande sur même canal) ou au format UMTS (Universal Mobile Telecommunications System - Système de télécommunications mobiles universelles).
  3. Procédé selon la revendication 1, caractérisé en ce que l'index AFS (8) des blocs SDC (7) est en plus repris dans les champs de données (3) des blocs AMDS (2) et les bits (6) du champ de contrôle (4) de chaque groupe AMDS (1) sont générés à partir des champs de données (9) des blocs de données SDC (7) repris.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que les groupes AMDS (1) sont numérotés en continu au moyen d'un compteur (m34, m33, m32 du bloc 1).
  5. Procédé selon la revendication 4, caractérisé en ce que la numérotation en continu de chaque groupe AMDS (1) est contenue dans un ou plusieurs bits de données AMDS (m34, m33, m32) réservés à cet effet.
  6. Procédé selon l'une des revendications 4 ou 5, caractérisé en ce que le ou les plusieurs bits de données AMDS (m34, m33, m32) réservés qui contiennent la numérotation en continu de chaque groupe AMDS (1) sont les bits de données (m34, m33, m32, ...) qui suivent le premier bit de données (m35) du premier bloc AMDS (2) d'un groupe AMDS (1).
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que les mêmes groupes AMDS (1) sont envoyés plusieurs fois.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que la numérotation en continu des groupes AMDS (1) s'effectue au moyen de la synchronisation, en ce que
    - le contenu des champs de contrôle (6) est calculé à partir du contenu des champs de données (5) au moyen du code de bloc cyclique,
    - que des paires de valeurs de décalage sont additionnées aux champs de contrôle (6),
    - que des syndromes sont calculés par paires à partir des valeurs de décalage et
    - que le contenu correspondant des groupes AMDS peut être déterminé au moyen des syndromes par paires contenues.
  9. Dispositif pour générer des données supplémentaires qui sont émises dans un système de radiodiffusion analogique (AM), les données supplémentaires contenant des informations relatives à des fréquences d'émission alternatives du programme correspondant, des données SDC, Service Description Channel - Canal de description de service, (11) conformément au document de l'ETSI TS 101 980 pouvant être acheminées au dispositif, lesquelles sont converties par le dispositif (14) en champs de données AMDS, Amplitude Modulation Data System - Système de données à modulation d'amplitude, (3) conformément à la Recommandation de l'UIT BS.706-2, caractérisé en ce que le dispositif est configuré pour mettre en oeuvre le procédé selon l'une des revendications 1 à 8.
  10. Dispositif selon la revendication 9, caractérisé en ce que le dispositif (14) contient un dispositif de calcul ((17) qui détermine, en fonction des informations contenues dans les champs de données AMDS (3), des mots de contrôle (4) destinés à détecter les erreurs et à corriger les erreurs et les insère dans les champs de contrôle (6) des champs de contrôle AMDS.
  11. Dispositif selon l'une des revendications 9 ou 10, caractérisé en ce que le dispositif présente un mécanisme de comptage (19) qui numérote en continu les groupes AMDS (1) et la numérotation est insérée dans au moins un champ de données AMDS (m34, m33, m32) réservé à cet effet.
  12. Récepteur pour recevoir et restituer des signaux de radiodiffusion transmis sous forme analogique et numérique, le récepteur étant configuré pour, lors de la restitution d'un signal de radiodiffusion transmis sous forme analogique, recevoir les données supplémentaires transmises au format AMDS et relatives à des fréquences d'émission alternatives sur lesquelles le même programme est transmis sous forme numérique, les interpréter et, en présence de fréquences d'émission alternatives sur lesquelles le même programme est transmis sous forme numérique, basculer automatiquement sur la fréquence alternative transmise sous forme numérique, caractérisé en ce que les données supplémentaires contiennent des informations relatives aux fréquences d'émission alternatives du programme correspondant, les fréquences d'émission alternatives concernant des systèmes de radiodiffusion numériques et les fréquences d'émission alternatives pour des systèmes de radiodiffusion numériques (DRM, DAB, iBiquity, IBOC, UMTS) étant transmises un format AMDS, Amplitude Modulation Data System - Système de données à modulation d'amplitude, conformément à la Recommandation de l'UIT BS.706-2 (1, 2, 3, 4, 5, 6), par le fait que les données transmises au format AMDS (1, 2, 3, 4, 5, 6) sont des données SDC, Service Description Channel - Canal de description de service, conformément au document de l'ETSI TS 101 980 (7, 8, 9, 10, 11, 12), lesquelles sont transmises au format AMDS au moyen d'une mise en correspondance par le fait que les blocs de données (11) des informations SDC sont repris dans des parties des champs de données (3) des blocs AMDS (2) et un bit de données (5) de chaque groupe AMDS (1) indique s'il s'agit du premier groupe AMDS (1) ou d'un groupe suivant d'une pluralité de groupes AMDS (1) transmis les uns derrière les autres et qui contiennent ensemble l'information d'un bloc SDC (7), caractérisé en ce que le premier bit de données (m35 du bloc 1) du premier bloc AMDS (2) de chaque groupe AMDS (1) indique s'il s'agit du premier (m35=1) groupe AMDS (1) ou d'un groupe suivant (m35=0) d'une pluralité de groupes AMDS (1) transmis les uns derrière les autres et qui contiennent ensemble l'information d'un bloc SDC (7).
  13. Récepteur selon la revendication 12, caractérisé en ce que le récepteur enregistre toutes les données supplémentaire relatives aux fréquences d'émission alternatives reçues dans une base de données et sélectionne à partir de cette base de données la fréquence alternative sur laquelle le programme radiodiffusé réglé est le mieux reçu.
  14. Récepteur selon la revendication 13, caractérisé en ce que pour sélectionner une fréquence alternative à partir de la base de données, les fréquences alternatives sont analysées dans un ordre prédéfini en fonction de leur mode de transmission, notamment dans l'ordre DAB, DRM, FM, AM.
EP05753998A 2004-07-02 2005-05-31 Procede et dispositif pour transmettre des donnees supplementaires relatives a des frequences d'emission numeriques alternatives, dans un systeme de transmission radio analogique Expired - Fee Related EP1784934B1 (fr)

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DE102004032286A DE102004032286A1 (de) 2004-07-02 2004-07-02 Verfahren und Vorrichtung zur Übertragung von Zusatzdaten in einem analogen Rundfunkübertragungssystem
PCT/EP2005/052478 WO2006003063A1 (fr) 2004-07-02 2005-05-31 Procede et dispositif pour transmettre des donnees supplementaires relatives a des frequences d'emission numeriques alternatives, dans un systeme de transmission radio analogique

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EP1784934A1 (fr) 2007-05-16
KR20070036087A (ko) 2007-04-02
WO2006003063A1 (fr) 2006-01-12
US20100002609A1 (en) 2010-01-07
CA2540976C (fr) 2013-05-14
US8009703B2 (en) 2011-08-30
DE102004032286A1 (de) 2006-01-19
CA2540976A1 (fr) 2006-01-12
CN1981466A (zh) 2007-06-13
KR101013646B1 (ko) 2011-02-10
CN1981466B (zh) 2013-06-19

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