WO2006035242A2 - Systeme de transmission de messages d'urgence et procede associe - Google Patents

Systeme de transmission de messages d'urgence et procede associe Download PDF

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Publication number
WO2006035242A2
WO2006035242A2 PCT/GB2005/003781 GB2005003781W WO2006035242A2 WO 2006035242 A2 WO2006035242 A2 WO 2006035242A2 GB 2005003781 W GB2005003781 W GB 2005003781W WO 2006035242 A2 WO2006035242 A2 WO 2006035242A2
Authority
WO
WIPO (PCT)
Prior art keywords
message
digital signal
configuration information
broadcast digital
emergency
Prior art date
Application number
PCT/GB2005/003781
Other languages
English (en)
Other versions
WO2006035242A3 (fr
Inventor
Dominic Thomas Parfrey Banham
Les Sabel
Original Assignee
Radioscape Limited
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
Priority claimed from GBGB0421674.3A external-priority patent/GB0421674D0/en
Application filed by Radioscape Limited filed Critical Radioscape Limited
Priority to EP05789257A priority Critical patent/EP1800424A2/fr
Publication of WO2006035242A2 publication Critical patent/WO2006035242A2/fr
Publication of WO2006035242A3 publication Critical patent/WO2006035242A3/fr

Links

Classifications

    • 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
    • H04H20/59—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for emergency or urgency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/10—Arrangements for replacing or switching information during the broadcast or the distribution
    • H04H20/103—Transmitter-side switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/02—Arrangements for relaying broadcast information
    • H04H20/06—Arrangements for relaying broadcast information among broadcast stations
    • 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

  • This invention relates to a message transmitter system and method; it finds particular application in systems for transmitting emergency messages in tunnels.
  • Transport tunnel and bridge systems are often required to provide a method of emergency communications to the users of the systems, whether they be public or commercial. Typically, this has been achieved using FM transmissions.
  • the off-air signal fades rapidly after entering the tunnel.
  • a repeater system is often provided. This repeater system 'sniffs' the off-air signal and then retransmits it within the tunnel. This then gives the flexibility for alternative use.
  • the retransmitted signal can easily be replaced with a locally generated and modulated signal.
  • the local signal simply 'over ⁇ powers' the off-air signal due to the attenuation of the off-air signal in the tunnel.
  • FM receivers pick-up the local content and play-out that audio to the listener. For the emergency situation this could be an emergency message from the local tunnel control centre.
  • someone driving a car through a tunnel can stay tuned to a FM radio station, but in the event of an emergency will hear a message transmitted by the tunnel control centre.
  • the DAB ensemble contains a number of sub-channels, each of which can have a different bit rate and FEC (Forward Error Correction) code rate.
  • FEC Forward Error Correction
  • the structure of the ensemble is provided to receivers in the form of a Fast Information Channel (FIC).
  • FIC provides the information requited to configure the receiver for a specific channel.
  • the present invention provides solutions to the above recognised problems.
  • a method of transmitting a message comprising the steps of: (a) deriving configuration information from a broadcast digital signal;
  • the present invention provides, in one implementation, a method of transmitting an emergency message using a DAB (Digital Audio Broadcasting) signal.
  • a DAB Digital Audio Broadcasting
  • Such a system is of particular relevance to transport tunnels and bridges.
  • the concept is to provide an Emergency Warning via DAB radio by replacing the current broadcast content on all channels and sub-channels with an emergency audio warning message.
  • Such a message may be pre-recorded or live.
  • a normal, broadcast transmission signal contains details of the transmission configuration (e.g. the sub-channel structure). This is typical in a DAB system, as well as other systems such as Digital Video Broadcasting (DVB) and Digital Radio Musice (DRM).
  • This configuration information is, in the present invention, automatically extracted and then used to pre-configure an alternative transmission system, the emergency system, to have exactly the same configuration.
  • the content, or carried information, of the normal broadcast is replaced with emergency warning information. Because both the normal broadcast and the emergency message share the same configuration information (e.g. sub-channel structure), end users' receivers can quickly decode any emergency message since no receiver re ⁇ configuration needs to occur.
  • Figure 1 which shows the system block diagram of an emergency transmitter in accordance with the present invention
  • Figure 2 which shows a low cost implementation of this kind of system.
  • Emergency message transmitters are deployed in tunnels etc. to transmit emergency messages to users (e.g. motorists) equipped with radio receivers.
  • Configuration information is derived from a normal, broadcast digital signal using a receiver situated at the tunnel mouth; this configuration information can include information defining the sub-channel structure.
  • a pre-recorded or live audio emergency message is then processed so that, when transmitted, it will conform to the configuration information.
  • the processed message is then transmitted within the tunnel during an emergency. Because the configuration information of the message matches that of the broadcast signal that was being processed by a user's radio receiver immediately prior to receipt of the emergency message, processing is far faster since the user's radio receiver does not have to re-configure itself.
  • the emergency transmitter system derives configuration information for the DAB signal from the FIC contained within that signal. This allows the emergency transmitter to provide the emergency warning message in exactly the same data format as the original off-air signal, thus eliminating the need for the receiver to reconfigure itself. Indeed the time taken for the 'hand-over' will simply be a function of the time to enter the tunnel (or bridge etc) transmission field, which, if the vehicle is moving at a reasonable speed (e.g. >30kph) will occur over approximately 1 sec (or, say, 10m). If the receiver is already in the tunnel's local field then the change over time is dictated by the signals interleaving depth, which for DAB E147 [1] is 384mS.
  • the operation of the emergency transmitter is based on the use of the received off-air FIC to configure a local ensemble multiplexer which then provides the emergency transmission system signal via a local COFDM modulator and power amplifier.
  • the off-air FIC has been used to ensure that the local emergency transmission has exactly the same structure as the off-air signal, the receiver will experience a rapid transition between the off-air signal and the emergency signal.
  • normal operation involves the use of an external off-air pick-up antenna (1), which is connected to the input LNA (2).
  • the received and amplified signal is applied to a switching unit (3) which selects its output as either the current off-air signal or the emergency signal and applies the selected signal to the power amplifier and output antenna system (4).
  • a switching unit (3) which selects its output as either the current off-air signal or the emergency signal and applies the selected signal to the power amplifier and output antenna system (4).
  • This signal path is used for normal operation where the off-air signal is simply retransmitted in the tunnel.
  • the delay in the tunnel transmission due to the processing delays of the LNA, switching unit and PA are small enough to ensure that the off-air signal and the tunnel transmission at the tunnel entrance are simply perceived as multiple paths of the same signal as is normally encountered in reflective propagation environments.
  • the DAB receiver (5) also receives the signal from the antenna (1).
  • the receiver (5) demodulates the signal and then decodes the FIC information. It then passes that FIC information to the Ensemble Multiplexer (EMUX) (6).
  • the EMUX configures itself to have a sub-channel structure which is identical to that of the off-air signal. This includes all the sub-channel data rates, FEC parameters, start and stop CU and the actual FIC information transmitted in the emergency signal. Hence, if there are 10 different sub-channels to the off-air broadcast, each with a different sub-channel structure, the EMUX configures itself so that each corresponding sub-channel has a matching sub-channel structure and all audio channels would have the emergency warning. 5 Any data channels would be loaded with null (all zeros) data, essentially as padding.
  • the emergency warning message can be either a live or pre-recorded audio message.
  • the live option is available, however, for smaller un-staffed tunnels an automatic system will generally be required.
  • the emergency warning content is delivered to the EMUX via an input and control management function (7) which reside in the EMUX or a separate device such as an Personal Computer (PC).
  • the pre ⁇ recorded messages are in the form of a database of files (8), or other suitable format, which
  • the off-air signal has the MPEG-I Audio Layer II format [2] and can have a range of different data rates from 8kbps to 384kbps in steps of 8kbps. Indeed the audio may also have one of 4 modes (single channel mono, dual channel mono, stereo and joint stereo) as well as two sampling rates 24 and 48kHz [I]. This gives 48 rates and a total of 384 rate, 0 mode and sampling rate combinations. In addition, the recording of different languages will often be required, increasing the total number of combinations. Note that it is not seen as difficult for someone skilled in the art of programming to develpp a system which can take an audio recording and generate a set of files which fulfil the above combinations automatically. 5
  • the EMUX (6) takes the input MPEG-I layer II streams and multiplexes them into the appropriate locations within the ETI stream.
  • the ETI stream also contains the details of the modulation and coding to be used for the transmission.
  • the ETI stream is then fed to the COFDM (9) which then performs the required coding and modulation functions.
  • the receiver (5) supplies the COFDM (9) with timing synchronisation information to ensure that the output signal is aligned with the off-aic repeater signal.
  • the alignment of the off-air and emergency signals needs to be less than the minimum guard interval for the DAB transmission symbols. This is approximately 31 microseconds for Mode III, however Mode II with a guard interval. of approximately 62 microseconds is the smallest guard interval that would be used for terrestrial broadcasts.
  • the COFDM (9) outputs the signal at RF (e.g. for Band III in the region of 200MHz).
  • This signal is input to the switching unit (3).
  • the control of the switching point is done by the emergency transmitter control UI (10).
  • the switch between the off-air repeated signal and the emergency signal should be done during the null symbol at the transmission frame boundary.
  • the transmission frame structure is repeated every 96mS in Mode 1. Hence two levels of synchronisation are required to ensure minimum received signal interrupts and hence minimum time to switch to audible emergency warnings, symbol level and transmission frame level.
  • the DAB receiver may be replaced with a DAB module, where here the DAB module performs all the requisite DAB receiver functions but which typically does not require any unit specific power supplies, casings and control code which could be supplied by the master control unit (10).
  • the Master control unit (10) could be a PC or a microcontroller.
  • the interface between the DAB module and the Master control unit could be via a number of industry standard interfaces such as I 2 C, USB or PCI.
  • the EMUX (6) in Figure 1 could also be replaced with a lower cost unit which has its functionality limited.
  • an EMUX is required to perform a range of management functions and to obtain input streams from a variety of sources, however in this case both of these functions are very limited.
  • the CODFM modulator (9) could be simplified as the full range of commercial features are not required, e.g. control functionality could be supplied by the Master control (10), the case and displays could be common for the entire system and the RF section (9b) could be optimised.
  • an embodiment of the emergency warning system tunnel control centre would consist of a microphone (11) to allow the recording or live announcement of emergency warnings.
  • the microphone (11) is connected via an Audio input processor (12) to a Musican (13) which produces the MPEG-I Layer II (MP2) data stream.
  • the stream's destination is controlled by a Control and management function (14) which can direct the input to a recording database (15) or directly to the tunnel-side equipment.
  • the transfer of data whether it be live MP2 streams, pre-recorded audio databases or control information and signalling would be performed using Internet Protocol based communications, e.g. TCP/IP or UDP.
  • the tunnel control centre also needs to be able to review any recordings made and stored in a database and hence the MP2 playback (16), Audio output (17) and speaker/headphone (18) need to be provided.
  • the activation of the emergency warning system may be by a number of methods including:
  • An addition to the audio provided by the emergency warning system is the inclusion of an emergency warning DLS (Direct Label Segment)- [I]. This will provide the receiver user with a textual display as well as audio.
  • DLS Direct Label Segment
  • a single warning message may be recorded and then the MP2 data stream is adjusted to provide the requited data rate.
  • the original recording could be a MP2 recording at 64kbps.
  • This recording can then be rate adjusted to a higher bit rate, e.g. 128kbps.
  • the quality of the new bit rate will be essentially the same as the original bit rate.
  • the 'up-sampling' can be achieved by padding the MP2 data.
  • a 'down sampling' requirement, e.g. 128 kbps down to 96kbps can be achieved by truncating the data in the sub-band data streams [I].
  • the COFDM modulator (9) in Figures 1 and 2 can also be frequency synchronised to the incoming signal.
  • the frequency synchronisation is necessary to ensure that the receiver signal tracking is not lost and a reacquisition caused.
  • the difference between the carrier frequency of the received off-air signal and the emergency warning signal should be less than 20Hz.
  • Two main methods exist for performing such frequency synchronisation the first being the use of a GPS receiver to provide a common frequency reference (all DAB transmitters are required to be time and frequency locked to
  • a preferred alternative is the use of the frequency offset information derived by the DAB receiver (5). This frequency offset is relative to the local frequency reference provided within the DAB receiver. This local frequency reference is then used as the reference frequency input to the COFDM modulator (9). In addition the timing reference required by the COFDM modulator (9) can also be provided by the DAB receiver (5). In both the frequency and time cases feedback will be required to ensure that closed loop synchronisation is achieved. Note that these feedback signals are not shown on Figures 1 or 2.
  • the signal level which is transmitted by the local transmitter could be adjusted to be similar to that of the normal, off-air retransmission signal. This is a useful additional 'synchronisation' as if the emergency transmission is a similar power to that which the receivers in the tunnel are receiving, then the AGC circuits in the RF section of the receivers will experience minimum disturbance and the probability of a receiver power induced decoding error will be minimised.
  • this feature is easily implemented by measuring the received signal power in the receiver (5) and sending this signal level, or power, information to the COFDM (9) where the signal level is appropriately adjusted.
  • the power level would normally be adjusted in the RF Section (9b).
  • a calibration procedure will need to be performed (usually at commissioning) to ensure that the difference between the receiver signal power measurement performed in (5) and the power output from the Input LNA is accurately determined.
  • This calibration procedure can be done automatically by providing a power measurement from the Input LNA to the RF Section to ensure that the power output from both the RF Section (9a) and the Input LNA (2) are the same (or at least within a selected tolerance such as IdB).
  • ETSI standard ETS 300 401 Radio broadcasting systems; Digital Audio Broadcasting (DAB) to mobile, portable and fixed receivers
  • DAB Digital Audio Broadcasting

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Circuits Of Receivers In General (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un système de transmission de messages d'urgence et un procédé associé. Le procédé consiste à mettre en place des émetteurs de message d'urgence dans des tunnels, etc. pour transmettre des messages d'urgence aux utilisateurs (automobilistes, par exemple) équipés de récepteurs radio, à dériver des informations de configuration d'un signal numérique de diffusion, normal, à l'aide d'un récepteur situé à l'entrée du tunnel, ces informations de configuration pouvant comprendre des informations décrivant une structure de sous-canal, puis à traiter un message d'urgence audio préenregistré ou en direct pour que, lors de sa transmission, il soit conforme aux informations de configuration. Du fait que les informations de configuration du message correspondent aux informations du signal de diffusion traité par le récepteur radio de l'utilisateur immédiatement avant la réception du message d'urgence, le traitement est sensiblement plus rapide étant donné que le récepteur radio de l'utilisateur ne doit pas être reconfiguré.
PCT/GB2005/003781 2004-09-30 2005-09-30 Systeme de transmission de messages d'urgence et procede associe WO2006035242A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05789257A EP1800424A2 (fr) 2004-09-30 2005-09-30 Systeme de transmission de messages d'urgence et procede associe

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0421674.3 2004-09-30
GBGB0421674.3A GB0421674D0 (en) 2004-09-30 2004-09-30 Emergency DAB transmitter system
GB0505316A GB2418803B (en) 2004-09-30 2005-03-15 Emergency message transmitter system and related method
GB0505316.0 2005-03-15

Publications (2)

Publication Number Publication Date
WO2006035242A2 true WO2006035242A2 (fr) 2006-04-06
WO2006035242A3 WO2006035242A3 (fr) 2006-06-08

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KR (1) KR20070083859A (fr)
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2120375A2 (fr) * 2008-05-13 2009-11-18 Electronics And Telecommunications Research Institute Procédé pour fournir un service de diffusion selon la zone en utilisant une diffusion multimédia numérique, et appareil et procédé pour recevoir le service de diffusion selon la zone en fonction de celui-ci
WO2011031906A1 (fr) 2009-09-11 2011-03-17 Lazer Spots, Llc Équipement, système et méthodologies pour segmenter une zone d'écoute dans des sous-zones permettant de distribuer des informations auxiliaires localisées
EP2357746A1 (fr) * 2009-12-21 2011-08-17 Electronics and Telecommunications Research Institute Appareil et procédé de transmission de contenu de service et appareil de diffusion d'urgence
ITTO20110429A1 (it) * 2011-05-13 2012-11-14 Bayerischer Rundfunk Anstalt Des Oe Ffentlichen Re System und verfahren zum einspeisen von einzuspeisenden mediendaten in einen multiplex
EP2328287A3 (fr) * 2009-11-30 2014-05-14 Electronics and Telecommunications Research Institute Relais de diffusion d'un signal de service d'urgence
DE102013109795A1 (de) 2013-09-06 2015-03-12 Sven Mulka Verfahren und Vorrichtung zum Einblenden von Alarmmeldungen in einem DAB-Ensemble innerhalb eines Tunnels
US9232481B1 (en) 2009-09-11 2016-01-05 Geo-Broadcast Solutions, Llc Equipment, system and methodologies for robust coverage in a broadcast area

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5471642A (en) 1994-01-28 1995-11-28 Palmer; James K. Re-broadcast system for a plurality of AM signals
DE19744420A1 (de) 1997-10-08 1999-04-15 Techno Trend Systemtechnik Gmb Verfahren zur Aussendung von Informationen innerhalb eines Gleichwellennetzes
US5912917A (en) 1990-10-18 1999-06-15 Engelbrecht; Lloyd Digital broadcast system
EP1244234A2 (fr) 2001-03-22 2002-09-25 Robert Bosch Gmbh Procédé pour l'émission de signaux numériques de radiodiffusion avec la transmission de programmes de radiodiffusion supra-régionaux et régionaux dans un fuseau horaire et une zone d'émission
DE10139069A1 (de) 2001-08-09 2003-02-27 Rohde & Schwarz Verfahren und Anordnung zum regionalen Einblenden von Lokalprogrammen in einem DVB-Gleichwellennetz

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5912917A (en) 1990-10-18 1999-06-15 Engelbrecht; Lloyd Digital broadcast system
US5471642A (en) 1994-01-28 1995-11-28 Palmer; James K. Re-broadcast system for a plurality of AM signals
DE19744420A1 (de) 1997-10-08 1999-04-15 Techno Trend Systemtechnik Gmb Verfahren zur Aussendung von Informationen innerhalb eines Gleichwellennetzes
EP1244234A2 (fr) 2001-03-22 2002-09-25 Robert Bosch Gmbh Procédé pour l'émission de signaux numériques de radiodiffusion avec la transmission de programmes de radiodiffusion supra-régionaux et régionaux dans un fuseau horaire et une zone d'émission
DE10139069A1 (de) 2001-08-09 2003-02-27 Rohde & Schwarz Verfahren und Anordnung zum regionalen Einblenden von Lokalprogrammen in einem DVB-Gleichwellennetz

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2120375A2 (fr) * 2008-05-13 2009-11-18 Electronics And Telecommunications Research Institute Procédé pour fournir un service de diffusion selon la zone en utilisant une diffusion multimédia numérique, et appareil et procédé pour recevoir le service de diffusion selon la zone en fonction de celui-ci
WO2011031906A1 (fr) 2009-09-11 2011-03-17 Lazer Spots, Llc Équipement, système et méthodologies pour segmenter une zone d'écoute dans des sous-zones permettant de distribuer des informations auxiliaires localisées
US9232481B1 (en) 2009-09-11 2016-01-05 Geo-Broadcast Solutions, Llc Equipment, system and methodologies for robust coverage in a broadcast area
EP2504945A1 (fr) * 2009-09-11 2012-10-03 Lazer Spots, LLC Équipement, système et méthodologies pour segmenter une zone d'écoute dans des sous-zones permettant de distribuer des informations auxiliaires localisées
US8862048B2 (en) 2009-09-11 2014-10-14 Geo-Broadcast Solutions, Llc Equipment, system and methodologies for segmentation of listening area into sub-areas enabling delivery of localized auxiliary information
EP2504945A4 (fr) * 2009-09-11 2013-08-14 Lazer Spots Llc Équipement, système et méthodologies pour segmenter une zone d'écoute dans des sous-zones permettant de distribuer des informations auxiliaires localisées
EP2328287A3 (fr) * 2009-11-30 2014-05-14 Electronics and Telecommunications Research Institute Relais de diffusion d'un signal de service d'urgence
EP2461500A3 (fr) * 2009-12-21 2012-08-01 Electronics and Telecommunications Research Institute Appareil et procédé de transmission de contenu de service et appareil de diffusion d'urgence
EP2357746A1 (fr) * 2009-12-21 2011-08-17 Electronics and Telecommunications Research Institute Appareil et procédé de transmission de contenu de service et appareil de diffusion d'urgence
ITTO20110429A1 (it) * 2011-05-13 2012-11-14 Bayerischer Rundfunk Anstalt Des Oe Ffentlichen Re System und verfahren zum einspeisen von einzuspeisenden mediendaten in einen multiplex
DE102013109795A1 (de) 2013-09-06 2015-03-12 Sven Mulka Verfahren und Vorrichtung zum Einblenden von Alarmmeldungen in einem DAB-Ensemble innerhalb eines Tunnels
EP2854314A1 (fr) 2013-09-06 2015-04-01 Sven Mulka Procédé et dispositif pour l'insertion de messages d'alarme dans un ensemble DAB dans un tunnel
EP3627729A1 (fr) 2013-09-06 2020-03-25 Sven Mulka Procédé et dispositif d'affichage des messages d'alarme dans un ensemble dab à l'intérieur d'un tunnel

Also Published As

Publication number Publication date
WO2006035242A3 (fr) 2006-06-08
EP1800424A2 (fr) 2007-06-27
KR20070083859A (ko) 2007-08-24

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