EP3627729A1 - Procédé et dispositif d'affichage des messages d'alarme dans un ensemble dab à l'intérieur d'un tunnel - Google Patents

Procédé et dispositif d'affichage des messages d'alarme dans un ensemble dab à l'intérieur d'un tunnel Download PDF

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Publication number
EP3627729A1
EP3627729A1 EP19207035.7A EP19207035A EP3627729A1 EP 3627729 A1 EP3627729 A1 EP 3627729A1 EP 19207035 A EP19207035 A EP 19207035A EP 3627729 A1 EP3627729 A1 EP 3627729A1
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EP
European Patent Office
Prior art keywords
dab
audio
sub
data
ensemble
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EP19207035.7A
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German (de)
English (en)
Inventor
Sven Mulka
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Individual
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Individual
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/02—Arrangements for relaying broadcast information
    • 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
    • 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
    • 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
    • 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 invention relates to a method for exchanging content in a DAB ensemble to form local windows within a single-frequency network, which is particularly suitable for alarming in a tunnel.
  • the invention further relates to a device for this purpose.
  • DAB Digital Audio Broadcasting, ETSI EN 300 401 V1.4.1 (2006-06 )
  • FIC Fast Information Channel
  • CU Capacity Unit
  • FIB Fast Information Block
  • guard interval is a protective distance between two successive DAB symbols and is in Transmission Mode I approx. 246ps, in Mode II approx. 62ps, in Mode III approx. 31 ⁇ s and in Mode IV approx. 123us.
  • ETI Ensemble Transport Interface
  • the local ETI data stream thus formed is distributed to the DAB transmitters in the local area and the global ETI data stream to the DAB transmitters in the global area. Since the localization of the content requires a non-negligible processing time, the transmission of the global ensemble must be delayed by this processing time. This can be done by an explicit delay element or distributed over all DAB transmitters using the time stamp technique. This process is widely used in engineering.
  • the schematic structure of a DAB single-frequency network with a local window is described with reference to FIG Fig. 1 explained in more detail.
  • the so-called ensemble multiplexer (101) combines the audio and data services to be broadcast together within an ensemble to form an ensemble in the form of the European Telecommunication Standard ETSI ETS 300 799 ed.1 (1997-09 ) defined Ensemble Transport Interfaces (ETI) together.
  • ETSI European Telecommunication Standard
  • This frame-oriented data stream is distributed to the DAB transmitters (103) via the ETI distribution network (102).
  • the incoming ETI frames are adapted in the DAB transmitter in a manner not shown in more detail via a dynamic or static delay element to the time requirements for synchronicity in the DAB single-frequency network, converted into DAB frames by a COFDM modulator and via a mixing stage broadcast as a global ensemble (105) with the following power amplifier on the desired frequency.
  • the global ensemble is also passed as an ETI data stream to a local multiplexer (108). This replaces individual sub-channels and FIBs with local content (109).
  • the ETI data stream localized in this way is distributed via the local ETI distribution network (110) to one or more local DAB transmitters (111) and is broadcast by them as a local ensemble (106) on the same frequency as that of the global ensemble.
  • Fig. 2 shows the schematic structure of a DAB repeater with intercom for supplying a tunnel with DAB signals according to the prior art.
  • a global DAB signal is received outside the tunnel by means of a directional antenna (201) and passed via a distributor (202) to a frequency-selective amplifier (203) and to a DAB reception module (207).
  • the amplifier (203) filters the global DAB signal and amplifies it to a predefined level by means of automatic gain control and outputs it as a regenerated DAB signal (204).
  • the DAB reception module (207) demodulates the supplied global DAB signal and outputs the decoded FIC (209). In addition, it generates a synchronization signal (208), which is not shown in more detail, and which is used in the local multiplexer (210) and in the DAB low-power transmitter (212) to synchronize the frames generated in each case.
  • the FIC (209) is used by the local multiplexer (210) to reconstruct the sub-channel configuration of the global DAB signal.
  • the sub-channel configuration defines the identifier, data rate, start address, error protection and content type for each sub-channel.
  • the audio encoders (216) are configured for each sub-channel with regard to data rate and audio standard (DAB-Musicam, DAB-Plus or DMB) by the local multiplexer.
  • the alarm message (214) is distributed via a distributor (215) to the audio encoders (theoretically up to 64, practically approx. 20 audio encoders) and is compressed by them to the data rate set in each case.
  • the local multiplexer forms a local ensemble which has the same logical structure as that of the global DAB signal.
  • the local ensemble is transferred to the DAB micro-power transmitter (212) as an ETI data stream (211).
  • the incoming ETI frames are adapted in the DAB micro-power transmitter (212) in a manner not shown to the time requirements for synchronicity in the DAB single-frequency network, converted into DAB frames by a COFDM modulator and via a mixing stage with the following output stage at the desired frequency output as a DAB signal (213).
  • a switch (205) can be used to switch from the regenerated global DAB signal (204) to the local DAB signal (213).
  • the respectively selected DAB signal is possibly further amplified and radiated into the area of the tunnel via one or more antennas (206).
  • a DAB receiver located in the tunnel can therefore receive either the global DAB signal or the local DAB signal with alarm messages, depending on the danger situation.
  • the use of a local multiplexer additionally requires the supply of the global ensemble to it. However, this additional effort is very impractical for small and medium-sized local windows, and it also results in permanent operating and rental costs for the line feed.
  • EP 2 461 610 discloses a method for broadcasting emergency information that is only relevant for a specific region. There is a first, general broadcast mode for digital radio signals and a second broadcast mode for emergency information, both of which are transmitted as an ETI data stream. If emergency information is available, the second mode is automatically selected by means of a switch and the emergency information is transmitted via an HF transmitter.
  • the emergency information is encoded in the method and converted to a predetermined bit rate that is smaller than the smallest bit rate of the broadcast signals of the first mode.
  • Fill bits are also inserted into the emergency information data stream, which are the difference of the predetermined ones Compensate the bit rate with the bit rates of the digital broadcast signals.
  • DE 197 44 420 discloses a method for localizing DAB content which dispenses with the supply of the global ensemble as an ETI data stream and instead uses a modified COFDM modulator in the DAB transmitter which is synchronized with the global DAB signal with respect to the DAB frame and only sends out the CU's of the content to be exchanged. No RF signal is transmitted at the locations of the CUs that are not to be changed.
  • a DAB receiver accordingly receives both localized and non-localized content in the area of the transmission of the local transmitter.
  • WO 2006/035242 discloses a method similar DE 197 44 420 , which also does not feed the global ensemble as an ETI data stream and instead uses a frequency-selective amplifier with automatic gain control and a DAB receiver.
  • the frequency-selective amplifier is used to process and feed the global DAB signal into the local area of the local window. This method is generally used in technology and is known under the term repeater.
  • the DAB receiver receives the global DAB signal and uses it to derive configuration and synchronization information for the local multiplexer.
  • the local multiplexer creates an alternative ensemble in which the original sub-channel content e.g. be replaced by alarm messages, whereby a separate audio encoder is used for each audio sub-channel.
  • the local ensemble generated in this way is temporarily broadcast in the area of the local window, for example of a car tunnel, during an emergency situation as an alternative to the global ensemble.
  • the object of the invention is to eliminate the disadvantages of the prior art.
  • an improved method for localizing content in a DAB single-frequency network is specified, which is suitable for signaling alarm information in a tunnel or local windows.
  • the proposed method makes it possible to reduce the number of audio encoders to one per audio standard.
  • the alarm message is first compressed to the lowest audio data rate within the DAB ensemble for each audio standard used.
  • the already compressed audio data stream is only adapted to the respective data rate of the subchannel by simply inserting filler data when it is keyed into the subchannel.
  • the invention is based on the consideration that the audio subchannels to be replaced have different data rates, but the same audio message is to be transmitted.
  • the quality of the audio message is of secondary importance for the alarm application purpose, so that even low data rates, ie high compressions of the audio data stream with reduced audio quality, are permissible.
  • the digital receive branch and the digital transmit branch are shared for the global DAB signal and the local DAB signal.
  • the method according to the invention can be used in DAB single-wave networks both for supplying a tunnel with alarm messages and for a local window.
  • this can Procedures can also be used to feed general local information.
  • the specified method has the advantage over the previously known solutions that only one audio encoder is required for compression of the alarm messages per audio standard and the otherwise conventional analog frequency-selective amplifier is replaced by digital modules.
  • Fig. 3 schematically shows an embodiment of the inventive method for exchanging content in a DAB ensemble for alarming in a tunnel.
  • a global DAB signal is received outside the tunnel by means of a directional antenna (301) and amplified, filtered and digitized via a digital IQ demodulator (302); the result is the DAB baseband prepared in this way in the form of digital IQ data (303 ) in front.
  • the transmission mode (305) is determined from the digital IQ data (303) by assessing the zero symbol length using a transmission mode detector (304).
  • the start of the zero symbol and thus the start of the DAB frames in the digital IQ data (303) is determined by a zero symbol detector (306).
  • the start of the zero symbol is marked by a pulse (307).
  • the pulse (307) is delayed via a delay element (331) and output as a start pulse (332) such that the start pulse (332) falls on the beginning of the next zero symbol.
  • the duration of the delay depends on the transmission mode and is 96ms in Mode I, 24ms in Mode II, 24ms in Mode III and 48ms in Mode IV.
  • Deviations in the sampling rate or frequency deviations (309) are determined by analyzing (308) the phase reference symbol within the digital IQ data (303), for example by autocorrelation or correlation with the known sequence for the phase reference symbol.
  • An oscillator (338) provides the system clocks (339 and 340) for the digital IQ demodulator (302) and the digital IQ modulator (336). If the frequency deviates, the oscillator is adjusted accordingly via the control value (309).
  • a FIC demodulator (310) performs the demodulation for the FIC symbols in the digital IQ data (303).
  • the FIC demodulated in this way contains basic configuration information about the DAB ensemble. Due to the system, the FIC is delayed compared to the DAB signal (301) and must be corrected accordingly.
  • the CIF count contained in FIG. 0/0 is increased by the value of N by means of the first FIC processing unit (311) and the reconfiguration possibly signaled in the FIC is shortened by N CIF frames by the second FIC processing unit (312) .
  • the value for N is preferably chosen so that N * 24ms is greater than or equal to the total delay time of the FIC.
  • the third FIC processing unit (313) extracts the ensemble configuration (MCI) from the FIC and stores it in the MCI database (320). All audio data rates (321) and the audio standards used are determined from the data collected therein. Furthermore, a list with configuration data of the audio sub-channel (322) and a list with configuration data of the data sub-channel (323) created. A generator (328) delivers appropriate filler data (329) for each data sub-channel in accordance with the configuration (323).
  • the alarm message (315) is routed via a distributor (316) to the audio encoders (317, 318, 319), only one encoder being available for each audio standard.
  • Each audio encoder (317, 318, 319) compresses the alarm message to the lowest data rate available in the ensemble or an even lower data rate.
  • the alarm messages compressed in this way are increased in the first audio processing unit (324) and adapted to the respective data rate according to the configuration (321) by inserting filler data.
  • the second audio processing unit (326) selects the appropriate alarm message with the appropriate data rate and the appropriate audio standard in accordance with the configuration (322) for each audio sub-channel.
  • the fourth FIC processing unit (314) replaces the text information contained in the FIC FIG 1/0, FIG 1/1, FIG 1/3, FIG 1/4, FIG 1/5 and FIG 1/6 by means of suitable textual information and passes the modified FIC (330) to the COFDM modulator (333).
  • the COFDM modulator (333) combines the FIC (330), the data subchannel (329) and the audio subchannel (327) and carries out the baseband modulation, using the control value frequency correction (309) and the transmission mode is observed.
  • the baseband modulated in this way becomes more digital as a stream IQ data (334) are output, the output of the zero symbol contained only beginning with the start pulse (332).
  • the digital IQ data (303) of the global DAB signal or the IQ data (334) of the local DAB signal are selected via the switch (335), with a switchover during the zero symbol preventing interference.
  • the digital IQ data stream selected by the changeover switch (335) is digitally filtered by the digital IQ modulator (336), mixed to the frequency of the DAB single-frequency network and output in analog form.
  • the analog DAB signal (337) generated in this way is possibly further amplified and radiated into the area of the tunnel via one or more antennas.
  • a DAB receiver located in the tunnel can therefore receive either the global DAB signal or the local DAB signal with alarm messages, depending on the danger situation.
  • FIG. 3 An embodiment of the device according to the invention is shown in Fig. 3 identified by reference numerals (300).

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
EP19207035.7A 2013-09-06 2014-09-03 Procédé et dispositif d'affichage des messages d'alarme dans un ensemble dab à l'intérieur d'un tunnel Pending EP3627729A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013109795.2A DE102013109795B4 (de) 2013-09-06 2013-09-06 Verfahren und Vorrichtung zum Einblenden von Alarmmeldungen in einem DAB-Ensemble innerhalb eines Tunnels
EP14183426.7A EP2854314B1 (fr) 2013-09-06 2014-09-03 Procédé et dispositif pour l'insertion de messages d'alarme dans un ensemble DAB dans un tunnel

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP14183426.7A Division-Into EP2854314B1 (fr) 2013-09-06 2014-09-03 Procédé et dispositif pour l'insertion de messages d'alarme dans un ensemble DAB dans un tunnel
EP14183426.7A Division EP2854314B1 (fr) 2013-09-06 2014-09-03 Procédé et dispositif pour l'insertion de messages d'alarme dans un ensemble DAB dans un tunnel

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EP3627729A1 true EP3627729A1 (fr) 2020-03-25

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EP14183426.7A Active EP2854314B1 (fr) 2013-09-06 2014-09-03 Procédé et dispositif pour l'insertion de messages d'alarme dans un ensemble DAB dans un tunnel
EP19207035.7A Pending EP3627729A1 (fr) 2013-09-06 2014-09-03 Procédé et dispositif d'affichage des messages d'alarme dans un ensemble dab à l'intérieur d'un tunnel

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EP14183426.7A Active EP2854314B1 (fr) 2013-09-06 2014-09-03 Procédé et dispositif pour l'insertion de messages d'alarme dans un ensemble DAB dans un tunnel

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EP (2) EP2854314B1 (fr)
DE (1) DE102013109795B4 (fr)
DK (1) DK2854314T3 (fr)
ES (1) ES2784178T3 (fr)

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Publication number Priority date Publication date Assignee Title
ITUB20160912A1 (it) * 2016-02-23 2017-08-23 Trx Innovate S R L Sistema di distribuzione di segnali radio

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19744420A1 (de) 1997-10-08 1999-04-15 Techno Trend Systemtechnik Gmb Verfahren zur Aussendung von Informationen innerhalb eines Gleichwellennetzes
EP0944194A2 (fr) * 1998-03-18 1999-09-22 Kabushiki Kaisha Kenwood Récepteur pour la réception de programmes de radiodiffusion numérique
WO2006035242A2 (fr) 2004-09-30 2006-04-06 Radioscape Limited Systeme de transmission de messages d'urgence et procede associe
EP2328287A2 (fr) * 2009-11-30 2011-06-01 Electronics and Telecommunications Research Institute Relais de diffusion d'un signal de service d'urgence
EP2461610A1 (fr) 2010-12-06 2012-06-06 Electronics and Telecommunications Research Institute Appareil et méthode de radiodiffusion d'information d'urgence utilisant la commutation automatique des canaux

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19744420A1 (de) 1997-10-08 1999-04-15 Techno Trend Systemtechnik Gmb Verfahren zur Aussendung von Informationen innerhalb eines Gleichwellennetzes
EP0944194A2 (fr) * 1998-03-18 1999-09-22 Kabushiki Kaisha Kenwood Récepteur pour la réception de programmes de radiodiffusion numérique
WO2006035242A2 (fr) 2004-09-30 2006-04-06 Radioscape Limited Systeme de transmission de messages d'urgence et procede associe
EP2328287A2 (fr) * 2009-11-30 2011-06-01 Electronics and Telecommunications Research Institute Relais de diffusion d'un signal de service d'urgence
EP2461610A1 (fr) 2010-12-06 2012-06-06 Electronics and Telecommunications Research Institute Appareil et méthode de radiodiffusion d'information d'urgence utilisant la commutation automatique des canaux

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DE102013109795A1 (de) 2015-03-12
EP2854314B1 (fr) 2020-01-22
DK2854314T3 (da) 2020-04-27
EP2854314A1 (fr) 2015-04-01
DE102013109795B4 (de) 2017-01-26
ES2784178T3 (es) 2020-09-22

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