EP1944888A2 - Procédé et dispositif destinés à la conversion d'un signal ETI quelconque en signal ETI ayant un mode 3 DAB - Google Patents

Procédé et dispositif destinés à la conversion d'un signal ETI quelconque en signal ETI ayant un mode 3 DAB Download PDF

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Publication number
EP1944888A2
EP1944888A2 EP07120736A EP07120736A EP1944888A2 EP 1944888 A2 EP1944888 A2 EP 1944888A2 EP 07120736 A EP07120736 A EP 07120736A EP 07120736 A EP07120736 A EP 07120736A EP 1944888 A2 EP1944888 A2 EP 1944888A2
Authority
EP
European Patent Office
Prior art keywords
information
information block
eti
dab
mode
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP07120736A
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German (de)
English (en)
Inventor
Gerold Bertram
Hartwig Mueller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 DE102007025618A external-priority patent/DE102007025618A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1944888A2 publication Critical patent/EP1944888A2/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
    • H04H20/46—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95
    • 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 and a device for converting any ETI signal, for example, with a DAB mode 1, 2 or 4 into an ETI signal with a DAB mode 3 according to the preamble of the independent claims 1 and 7.
  • DAB Digital Audio Broadcasting
  • Corresponding service providers generate data streams which are combined in a DAB multiplex, the so-called ensemble, and on a corresponding FIC channel (Fast Information Channel) and on a corresponding MSC channel (Main Service Channel) by means of an ETI interface (Ensemble Transport Interface). be transmitted to a transmitting device (radio station).
  • FIC channel Fast Information Channel
  • MSC channel Main Service Channel
  • ETI interface Ensemble Transport Interface
  • the data services contained in the ensemble are decoded and are available without having to change the reception frequency.
  • the data services are combined in service packages and assigned to a subchannel.
  • traffic information which are offered by several radio stations as additional data service, must be transmitted only once.
  • each service provider provides additional information about the data offered by him. This additional information is also transmitted via the FIC channel.
  • any data services can be transmitted, in particular station names, alternative frequencies, program names, traffic information, etc.
  • the data is encoded in DAB mode 1, 2 or 4 and is often stored as canned food.
  • a conversion to a DAB mode 3 is required. Conversion of data within DAB modes 1,2 or 4 is less problematic because these modes are similar in structure. However, a data conversion into mode 3 is problematic.
  • the data stored in DAB mode 1, 2 or 4 differ from DAB mode 3 in that three information blocks FIB (fast information block) can be transmitted per unit time, one information block FIB 256 Contains bits. With DAB Mode 3, however, four blocks of information FIB per time unit are required. Due to the different number of information blocks FIB, only one signal conversion between the DAB modes 1, 2 or 4 has been done, but not in the DAB mode 3.
  • an apparatus and a method for receiving and outputting broadcast signals is known. It is proposed a device with which in particular DAB broadcast signals can be received and output.
  • the device has an input device with which digital broadcasting signals can be received by a receiving antenna.
  • a computing unit is provided with which the recorded digital broadcast signals are divided into audio signals and additional signals and converted. Subsequently, the converted audio signals are output as analog audio signals through an audio channel.
  • the converted auxiliary signals are decoded by an RDS encoder which outputs analogue additional signals.
  • the device has a modulator for recording the analog audio signals and additional analog signals. The modulator modulates the analog additional signals to the analog audio signals and thus generates analog FM signals. The generated analog FM signals are output to an analog radio receiver.
  • the invention has for its object to provide a method and a device with which any ETI signal can be converted into a DAB mode 3. This object is achieved with the features of the independent claims 1 and 7.
  • the fourth information block has an "end marker” field at its beginning. This "end marker” field ensures that the decoder device of the receiving device does not need to evaluate any significant data in the fourth information block.
  • Another aspect of the invention is padding the fourth information block following the end marker field to achieve the required 256 bit length of the information block.
  • a redundancy check is performed at the end of the fourth information block.
  • a 16-bit data word about the content of the fourth information block is cyclically calculated with a predetermined algorithm.
  • one or more useful information groups are arranged in the fourth information block instead of padding.
  • the information groups can be copied from other information blocks and then arranged in the fourth information block. It is provided that at least one useful information group is arranged in the fourth information block in front of the "End Marker" field. For example, a subchannel organization may be copied as an information group into the fourth information block. This has the advantage that the bandwidth of the DAB signal in mode 3 can be better utilized for the transmission of the data.
  • the device for converting any ETI signal into a DAB signal mode 3 is connected to a transmitting device.
  • the transmitting device is designed to transmit the ETI data stream with the DAB mode 3 coding and transmits a corresponding ETI data stream, which is received and decoded by a DAB radio receiver.
  • FIG. 1 For a better understanding of the invention, the structure of a known DAB (Digital Audio Broadcasting) ETI signal with a transmission frame 10 as described in the EUROPEAN STANDARD (Telecommunications Series) ETSI EN 300 401 V1.4.1 (2006-01 ) is defined. Within the transmission frame 10 of the ETI signal, a synchronization channel synchron Ch, a fast information channel FIC and a main service channel MSC are arranged.
  • DAB Digital Audio Broadcasting
  • FIC Fast information channel
  • MSC main service channel
  • Synchronization Channel Synchr Ch is used for basic demodulation, in particular for transmission frame synchronization, for automatic frequency control, for determining channel status and for transmission identification.
  • fast information blocks FIB are arranged depending on the selected transmission mode (DAB mode). For example, a total of 12 FIB blocks with a transmission frame of 96 ms are arranged in DAB mode 1, 3 FIB blocks with a transmission frame of 24 ms are arranged in DAB mode 2, 4 FIB blocks with a transmission frame of 24 in DAB mode 3 ms arranged in DAB mode 4 and 6 FIB blocks are arranged with a transmission frame of 48 ms.
  • DAB mode transmission mode
  • the Main Service Channel MSC is used for multiplexing functions, time, data and other basic functions.
  • the invention relates to a method or a device with which any ETI signal, for example with a DAB mode 1, 2 or 4 can be converted into an ETI signal with the DAB mode 3.
  • FIG. 1 By way of example, a transmission frame 10 of an ETI signal with a DAB mode 2 is shown.
  • three information blocks FIB are arranged per unit time in the fast information channel FIC.
  • the information blocks FIB are labeled FIB 1, FIB 2 and FIB 3.
  • a synchronization channel synchronous Ch is connected upstream and a main service channel MSC (main service channel) downstream.
  • the time unit used for the Fast Information Channel FIC and the Main Service Channel MSC is 24 ms, ie the data of the three information blocks FIB and the Main Service Channel MSC are transmitted within 24 ms in each case.
  • each information block FIB1, FIB2, FIB3 has a block length of 256 bits. Within this block length, a plurality of information groups FIGs can be arranged, wherein each information group FIG has a header and a data field.
  • the transmission speed and the transmission rate are relatively low.
  • the individual information blocks FIB are assigned to the so-called Common Interleaved Frames CIFs transmitted in the Main Service Channel MSC, with three information blocks FIB each being assigned to a CIF frame.
  • DAB modes 1, 2 or 4 can thus be divided into groups of three information blocks FIB each. As a result, they can be mutually converted.
  • DAB Mode 3 With DAB Mode 3, however, four information blocks FIB are required.
  • a fourth information block Add 30 In order to enable a conversion into the DAB mode 3, it is proposed according to the invention, in the conversion of an ETI signal, in particular from a DAB mode 1, 2 or 4, into an ETI signal with a DAB mode 3, a fourth information block Add 30.
  • the fourth information block 30 is called a dummy FIB.
  • FIG. 2 explained in more detail.
  • FIG. 2 The transformation of in FIG. 1 represented ETI signal from DAB mode 2 in the DAB mode 3 is in FIG. 2 shown.
  • the converted New ETI signal in the DAB mode 3 contains the three information blocks FIB1, F1B2 and FIB3 and the fourth information block 30, which is identified as a dummy FIB.
  • This arrangement thus results in a converted ETI signal DAB mode 3, which has arisen from an arbitrary ETI signal, in particular with a DAB mode 1, 2 or 4.
  • the data in the synchronization channel Synchr Ch and in the main service channel MSC are adjusted accordingly to ensure an exact assignment to the original ETI signal in DAB mode 2.
  • the information block 30 thus essentially serves to generate the structure of a regular ETI signal in DAB mode 3. With the conversion according to the invention, the requirements for an ETI signal in the DAB 3 mode specified in the EUROPEAN STANDARD can thus be met in a very simple manner.
  • any desired ETI signal is divided by splitting or adding FIB blocks into an EIT Signal can be converted in DAB mode 3.
  • each Information Channel FIC now contains four FIB blocks.
  • FIB blocks are divided into two fast information channel FIC with three FIB blocks each and that one dummy block is added so that for the new ETI signal in DAB mode 3 all information Channel FIC now contains four FIB blocks.
  • FIG. 3 is shown in schematic representation how the fourth information block 30 (dummy FIB) is structured in detail.
  • a block end field with an "end marker” 31 is already set at the beginning of the information block 30.
  • the "End Marker” field 31 is padded with "1".
  • the fourth information block 30 likewise has a data field with 256 bits, like a normal information block FIB, the remaining data field of the information block 30 is filled up by padding. Padding is the completion of a data field with unusable or useful data. In this case, the data field is padded with "0".
  • a redundancy check CRC Cyclic Redundancy Check
  • the fourth information block 30 is thus structured according to the same scheme as defined in the relevant standardization for all information blocks FIB.
  • FIG. 4 an alternative solution for the fourth information block 30 is shown.
  • one or more information groups FIG are copied from a previous information block FIB, for example the information block FIB 1, FIB 2 or FIB 3.
  • FIG. 4 is removable, the two information groups FIG with the name 1 and FIG. 2 arranged at the beginning of the fourth information block 30.
  • the information groups 1 and FIG. 2 contain useful information, such as data about the organization of the subchannel, information about a data type or any other information.
  • the "End Marker" 31 is set using corresponding "1".
  • the bandwidth of the DAB transmission channel is advantageously utilized to a better extent. Thus, more digitized data can be transmitted.
  • FIG. 5 is a schematic representation of a block arrangement for a device 40 according to the invention for converting any ETI signal into an ETI signal in DAB mode 3 shown.
  • the ETI data stream with DAB mode 1, 2 or 4 is available. Analogous to the representation in FIG. 1 It is assumed that the available ETI data should be transferred according to DAB Mode 3. These data are converted into DAB mode 3 in block 42 as previously described FIGS. 2 to 4 has been described.
  • Block 43 then contains the converted ETI data stream in DAB mode 3.
  • a modulation of the DAB mode 3 data stream is then passed to a transmitting device 45 and broadcast so that it can be received by a DAB broadcast receiver.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
EP07120736A 2006-12-28 2007-11-15 Procédé et dispositif destinés à la conversion d'un signal ETI quelconque en signal ETI ayant un mode 3 DAB Withdrawn EP1944888A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006061678 2006-12-28
DE102007025618A DE102007025618A1 (de) 2006-12-28 2007-06-01 Verfahren und Vorrichtung zur Umwandlung eines beliebigen ETI Signals in ein ETI Signal mit DAB-Mode 3

Publications (1)

Publication Number Publication Date
EP1944888A2 true EP1944888A2 (fr) 2008-07-16

Family

ID=39265243

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07120736A Withdrawn EP1944888A2 (fr) 2006-12-28 2007-11-15 Procédé et dispositif destinés à la conversion d'un signal ETI quelconque en signal ETI ayant un mode 3 DAB

Country Status (1)

Country Link
EP (1) EP1944888A2 (fr)

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