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WO1992008303A1 - Fonctionnement d'un systeme de donnees radio sur canaux multiples - Google Patents

Fonctionnement d'un systeme de donnees radio sur canaux multiples Download PDF

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Publication number
WO1992008303A1
WO1992008303A1 PCT/GB1991/001871 GB9101871W WO9208303A1 WO 1992008303 A1 WO1992008303 A1 WO 1992008303A1 GB 9101871 W GB9101871 W GB 9101871W WO 9208303 A1 WO9208303 A1 WO 9208303A1
Authority
WO
WIPO (PCT)
Prior art keywords
data
channels
channel
tmc
rds
Prior art date
Application number
PCT/GB1991/001871
Other languages
English (en)
Inventor
John Lawrence Riley
Andrew Kevin Mcparland
Simon John Parnall
Original Assignee
British Broadcasting Corporation
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 British Broadcasting Corporation filed Critical British Broadcasting Corporation
Priority to JP3517126A priority Critical patent/JPH06504413A/ja
Priority to AU87493/91A priority patent/AU649740B2/en
Publication of WO1992008303A1 publication Critical patent/WO1992008303A1/fr
Priority to FI931853A priority patent/FI931853L/fi

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/18—Arrangements for synchronising broadcast or distribution via plural systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J4/00—Combined time-division and frequency-division multiplex systems
    • 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
    • H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
    • H04H20/34—Arrangements for simultaneous broadcast of plural pieces of information by plural channels using an out-of-band subcarrier signal
    • 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
    • H04H2201/40—Aspects of broadcast communication characterised in that additional data relating to the broadcast data are available via a different channel than the broadcast channel

Definitions

  • the present invention relates to the Radio Data System (RDS) and, in particular, its use as a Traffic Message Channel ('TMC').
  • RDS Radio Data System
  • 'TMC' Traffic Message Channel
  • TMC Traffic Message Channel
  • TMC data cannot occupy all the available capacity of an RDS channel: other background data must also be present.
  • Other types of RDS data occupy more than three quarters of the data capacity available and, consequently, the capacity available for TMC is likely to be limited to 10-20% of the total, that is, one or two groups per second out of the eleven provided on the RDS system.
  • the minimum data rates stipulated for the main RDS features prevent the TMC data capacity in any one channel being greater than this.
  • a method of transmitting data over a radio data system in which the data is transmitted over a plurality of radio data channels, data being transmitted at intervals over each channel such that data is transmitted over the respective channels at different times and such that the channels carry the data transmission in turn, whereby the rate at which data is transmitted over the plurality of channels taken in combination is greater than the rate at which it is transmitted over any one channel.
  • the TMC groups would need to be "bunched-up" or compressed on each channel so that there is an opportunity, in between processing them, to re-tune to another channel for more data.
  • the multiplexing would be at a low cycle rate in the order of a second or so. Although this restricts when the TMC data can be inserted on any one channel, it should be possible for an intelligent RDS encoder to arrange the overall transmission of RDS groups so as to maintain the minimum requirements for the repetition of the standard group types.
  • This method requires synchronisation of the TMC data on different channels but this can be accomplished by reference to the Clock Time (CT) Groups.
  • CT Clock Time
  • the necessary phasing information could be signalled as part of the TMC data, in a system message.
  • the RDS data transmission rate is defined to be 1187.5 bit/sec ⁇ .0.125 bit/sec. This implies a Group transmission rate of between 685.0240386 and 685.168269 Groups/minute.
  • TMC message cycles are restrained to start and finish at minute-edge boundaries governed, when present, by a CT Group 4A.
  • the end of this Group is defined to occur within 100 ms of the minute/second edge and it occupies one of the 685+ Group slots each minute. Some minute periods will contain 684 other RDS Group slots between successive CT Groups and others will contain 685.
  • CT Groups would not interfere with these reserved slots. If other RDS data needed to occupy the reserved TMC slots, the TMC data would not be sent at that time.
  • Type 14B Groups which signal the start of a traffic message broadcast via EON, might be considered of higher priority than TMC and the next TMC data would be 'pushed on' until the next vacant normal slot in the RDS data system.
  • the switching cycle envisaged would be between about 1 ⁇ 4 second and several seconds.
  • each channel is allocated a time-slot to which TMC data is confined, although not every group period is necessarily occupied by TMC data. Indeed, the basic requirements of the minimum repetition frequencies of the main features must be met first.
  • the precise phases of the time slots allocated to each channel would be signalled in separate system messages carried within the TMC data. In a multichannel system, the time-slots of the other channels and their RF frequencies would also be signalled both within the TMC data and using the EON feature.
  • the TMC data (Type 8A) Groups can be arranged at the RDS encoder to occupy declared time-slots which are defined by a particular phase relationship with the minute or second edge observed after a Clock Time (CT) Group. This phase relationship can be signalled in a system message. If the TMC data, carried on different channels, occupies different time-slots and with a sufficient time-margin between them, a receiver can increase its TMC data throughput.
  • Clock Time Clock Time
  • the allocated time-slots represent those times outside which TMC data is not allowed for that channel. It is not intended that all slots allocated to 'N', for example, would be occupied by TMC Groups; that would infringe the minimum
  • the margin of several RDS Groups between TMC-Group slots is required both for re-tuning/RDS decoding and to allow for any time-slot which results from the non-synchronisation of Group boundaries between one channel and another.
  • the two possible phases for TMC data can be identified by a single address bit.
  • Other examples could be defined in a similar manner and these could spread to multiplex cycles longer than about one second as used in the examples given. Further channels could be multiplexed at these longer multiplex cycle times but this would further restrict the broadcaster in the timing of the bunches of TMC data.
  • a listener accesses TMC data by a single function
  • the receiver is sufficiently frequency-agile and intelligent to perform all the necessary processing to render its operation transparent to the listener.
  • the receiver recognises a TMC channel by one of two methods: by simply detecting Type 8A RDS groups or by indirect reference from a variant of a Type 1A group. Once a TMC channel is found its data- can immediately be decoded and used to build up a stored repertoire of current messages in the receiver. This is a straightforward case of single channel TMC operation.
  • some of the TMC data contains system messages which gives information about the format of messages in the tuned channel and the PI codes of other relates TMC channels.
  • this information includes phasing data which defines the time-slots allocated to the channel .
  • the receiver then knows when it can expect TMC data and when it is free to do other things.
  • the PI codes "of related channels allows the receiver to acquire their TMC data as well.
  • the frequency of the other channels and their time-slots can be signalled by the EON feature.
  • This receiver incorporates a remotely-tunable front-end, RDS demodulator and decoding facilities.
  • it was programmed in HP BASIC to operate a cycle of alternate tuning to two off-air signals and displaying the decoded PI code in each case. The speed at which it could do this process could be adjusted until the RDS decoding became corrupted. This was found to occur when about a 11 ⁇ 2 second was allowed for each re-tuning, settling and RDS decoding process.
  • the front-end receiver used in the Reference receiver is not intended for fast switching; it is basically a monitoring receiver. For this application, the time constants in the AGC feedback loop have been reduced to allow a faster re-tuning response. This cannot, however, be expected to approach the switching speed of a synthesiser controlled directly as part of an integrated receiver design. This 3 second cycling to access two channels could be considered a "worst case".
  • the ESVP receiver is capable of re-tuning faster than the Reference receiver.
  • the demodulated FM multiplex signal was fed into an RDS decoder and the data/clock connected to a parallel interface associated with a PC.
  • the PC acted as an interface with the SUN and converted the data bit-stream into a byte-serial form.
  • the PC was connected via a serial interface to a SUN workstation which was programmed in C to decode the RDS data in real-time.
  • the same re-tuning cycle, described above, was implemented with this system and it was found that a re-tuning, settling and RDS decoding process could be achieved in between one-quarter and one-third of a second.
  • the number 684 happens to have factors of 9, 12, and 18 so that reserved TMC slots could be allocated in such a way as to allow differently phased slots to be used on different channels and with sufficient free groups in between to allow for

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Circuits Of Receivers In General (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)

Abstract

On transmet des données, par exemple, des donnés circulant dans un canal de messages, au moyen d'un système de données radio par multiplexage sur plusieurs canaux disponibles. On transmet les données par intervalles sur chaque canal, afin que la transmission s'effectue à des moments différents et sur des canaux différents. Il en résulte que la cadence à laquelle les données sont transmises sur la pluralité de canaux combinés est supérieure à la cadence d'une transmission effectuée sur un canal seulement.
PCT/GB1991/001871 1990-10-25 1991-10-25 Fonctionnement d'un systeme de donnees radio sur canaux multiples WO1992008303A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP3517126A JPH06504413A (ja) 1990-10-25 1991-10-25 Ｒｄｓの多重チャネル動作
AU87493/91A AU649740B2 (en) 1990-10-25 1991-10-25 Multichannel operation of RDS
FI931853A FI931853L (fi) 1990-10-25 1993-04-23 Flerkanalig operation av ett radiodatasystem

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9023307.3 1990-10-25
GB909023307A GB9023307D0 (en) 1990-10-25 1990-10-25 Multichannel operation of rds

Publications (1)

Publication Number Publication Date
WO1992008303A1 true WO1992008303A1 (fr) 1992-05-14

Family

ID=10684386

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/001871 WO1992008303A1 (fr) 1990-10-25 1991-10-25 Fonctionnement d'un systeme de donnees radio sur canaux multiples

Country Status (6)

Country Link
EP (1) EP0555304A1 (fr)
JP (1) JPH06504413A (fr)
AU (1) AU649740B2 (fr)
FI (1) FI931853L (fr)
GB (2) GB9023307D0 (fr)
WO (1) WO1992008303A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997047101A1 (fr) * 1996-05-30 1997-12-11 Robert Bosch Gmbh Procede de traitement de donnees au moyen d'un recepteur radio

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5649297A (en) * 1994-10-21 1997-07-15 Seiko Communications Holding N.V. Transmitting digital data using multiple subcarriers
EP0762680A3 (fr) * 1995-08-23 2001-04-25 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Méthode pour la transmission et l'installation et/ou l'actualisation de logiciel et/ou de données
JP4447053B2 (ja) 1995-10-24 2010-04-07 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ ラジオ放送システムと、このようなシステムにおいて使用する送信機および受信機と、ラジオ放送方法と、ラジオ放送信号
DE19650429A1 (de) * 1996-12-05 1998-06-10 Bosch Gmbh Robert Verfahren und Einrichtung zum Senden von Meldungen mit schwankendem Aufkommen als Radio-Daten-Signale
DE50110332D1 (de) * 2001-03-15 2006-08-10 Siemens Ag RDS-TMC-Rundfunkempfänger und Verfahren zum Kalibrieren eines internen Zeitgebers in einem Rundfunkempfänger
EP1241812B1 (fr) * 2001-03-15 2006-06-14 Siemens Aktiengesellschaft Procédé à determiner un code RDS avec un récepteur de radiodiffusion

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2705795A (en) * 1949-07-06 1955-04-05 Fisk Bert Data transmission system
EP0196723A2 (fr) * 1985-03-29 1986-10-08 Philips Patentverwaltung GmbH Méthode et circuit pour la synchronisation des dispositifs de réception dans un système de transmission multiplex numérique
WO1988000417A2 (fr) * 1986-07-02 1988-01-14 ETAT FRANÇAIS représenté par LE SECRETARIAT D'ETAT Procede et installation permettant la communication de donnees numeriques en particulier entre et vers des vehicules en deplacement
WO1989012881A1 (fr) * 1988-06-18 1989-12-28 Robert Bosch Gmbh Recepteur radio et procede d'exploitation de nouvelles sur la circulation reçues sous forme numeriquement codee dans des telegrammes de donnees
US4922483A (en) * 1987-10-02 1990-05-01 Kabushiki Kaisha Kenwood Multi-channel PCM music broadcasting system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2208984B (en) * 1987-08-24 1991-05-29 British Broadcasting Corp Improved radio data system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2705795A (en) * 1949-07-06 1955-04-05 Fisk Bert Data transmission system
EP0196723A2 (fr) * 1985-03-29 1986-10-08 Philips Patentverwaltung GmbH Méthode et circuit pour la synchronisation des dispositifs de réception dans un système de transmission multiplex numérique
WO1988000417A2 (fr) * 1986-07-02 1988-01-14 ETAT FRANÇAIS représenté par LE SECRETARIAT D'ETAT Procede et installation permettant la communication de donnees numeriques en particulier entre et vers des vehicules en deplacement
US4922483A (en) * 1987-10-02 1990-05-01 Kabushiki Kaisha Kenwood Multi-channel PCM music broadcasting system
WO1989012881A1 (fr) * 1988-06-18 1989-12-28 Robert Bosch Gmbh Recepteur radio et procede d'exploitation de nouvelles sur la circulation reçues sous forme numeriquement codee dans des telegrammes de donnees

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
EBU REVIEW- TECHNICAL. no. 233, February 1989, BRUSSELS BE pages 9 - 16; D. KOPITZ: 'Radio Data System - from specification to practical reality' see page 15, paragraph 5.3 *
VEHICLE NAVIGATION & INFORMATION SYSTEMS CONFERENCE RECORD - Pages A44-A48 11-13 September 1989 TORONTO, CA P. Davies: "The Radio System-Traffic Channel" see the whole document *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997047101A1 (fr) * 1996-05-30 1997-12-11 Robert Bosch Gmbh Procede de traitement de donnees au moyen d'un recepteur radio

Also Published As

Publication number Publication date
JPH06504413A (ja) 1994-05-19
GB9023307D0 (en) 1990-12-05
FI931853A0 (fi) 1993-04-23
GB2251767A (en) 1992-07-15
AU8749391A (en) 1992-05-26
EP0555304A1 (fr) 1993-08-18
GB9122683D0 (en) 1991-12-11
FI931853L (fi) 1993-04-23
AU649740B2 (en) 1994-06-02

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