KR20080063185A - Method and device for conversion of a eti-signal to eti-signal with dab-mode 3 - Google Patents

Abstract

A method and an apparatus for converting an ETI-signal into an ETI-signal with DAB(Digital Audio Broadcasting) mode 3 are provided to add a fourth FIB to the ETI-signal, formed by three FIBs, thereby demodulating and transmitting ETI data without additional processing in a separate receiving device. An ETI(Ensemble Transport Interface)-signal to be converted includes three FIBs(Fast Information Blocks) having the length of 256bit respectively. The converted ETI-signal of DAB mode 3 has four FIBs by time. A fourth FIB(30) is added to form the ETI-signal of DAB mode 3 following the three FIBs(FIB1,FIB2,FIB3). The fourth FIB is formed into a dummy-FIB.

Description

Method and device for conversion of a ETI-signal to ETI-signal with DAB-Mode 3}

The present invention relates to a method or apparatus for converting any ETI-signal having, for example, DAB mode 1, 2 or 4 into an ETI-signal having DAB mode 3, according to the preambles of claims 1 and 7. will be.

In a DAB-radio system (digital audio broadcast), it is known that a digitized data stream is transmitted from a broadcast station, decoded by a corresponding broadcast receiver (radio), and converted into an audible signal (information). In addition, there is a method in which a digitized data stream is transmitted in addition to the audible signal, and information of the data stream is provided to a display of a broadcast receiver. The service provider forms the so-called ensemble in the DAB-Multiplex, and the ETI-Ensemble Trasnport in the corresponding FIC-channel (Fast Information Channel) and the corresponding MSC-channel (Main Service Channel). Interface; generate a data stream that is transmitted to a transmitting device (radio transmitter) by an ensemble transmission interface.

In addition to the sound signal on the receiving side, for example, car audio, service data contained in the ensemble (ETI-data stream) is decoded and can be used without changing the reception frequency. Service data is integrated into service packets and assigned to partial channels. Thus the same information, for example the same traffic information provided as additional service information from multiple radio stations, has to be transmitted only once. Nevertheless, to ensure that the information contained in the DAB-multiplex can be distributed into separate partial channels, all service providers provide additional information about the data they provide. This additional information is likewise transmitted on the FIC-channel. Thus, any service data in the FIC-channel, in particular the transmitting station name, alternative frequency, program name, traffic information, etc. can be transmitted.

For DAB-test devices, for example, data of DAB mode 1, 2 or 4 are coded and often stored for storage. However, the stored data must be converted to DAB mode 3 because it must be sent by the same transmitting device regardless of its coding. The conversion of data is less problematic in DAB modes 1, 2 or 4 because the modes are similar in structure. But the conversion of data to mode 3 is a problem. Data stored in modes 1, 2 or 4 differ from mode 3 in that three information blocks (FIB) can be transmitted per unit of time, in which case the information block (FIB) comprises 256 bits. Since the number of information blocks FIB is different, the signal conversion between DAB modes 1, 2 or 4 has been performed so far, but the conversion to mode 3 has not been performed.

Also known are apparatus and methods for receiving and transmitting broadcast signals in DE 102005 023091 A1. In particular, an apparatus capable of receiving and transmitting DAB-radio signals is proposed. The apparatus includes a receiving apparatus capable of receiving a digital broadcast signal by a receiving antenna. In addition, a calculation unit is provided, and the received digital broadcast signal is subdivided and converted into an audio signal and an additional signal by the calculation unit. Subsequently, the converted audio signal is provided over an audio channel as an analog audio signal. The converted additional signal is decoded by the RDS-encoder and the encoder provides an analog additional signal. The apparatus also includes a modulator for receiving analog audio signals and analog additional signals. The modulator modulates the analog add signal into an analog audio signal to form an analog FM signal. The generated analog FM signal is provided to an analog broadcast receiver.

It is an object of the present invention to provide a method or apparatus capable of converting any ETI-signal to DAB mode 3.

This object is achieved by the features according to claims 1 and 7.

In the method or apparatus according to the invention for converting any ETI-signal comprising the features of claims 1 and 7 into an ETI-signal having DAB mode 3, preferably, for example, DAB mode 1, 2 Or existing ETI-data with 4 is converted into ETI-data or data stream with DAB mode 3, and thus can be used uniformly. The data set may for example be converted at the transmitting device and transmitted as a DAB mode 3 ETI-data stream. At the receiving device, the DAB mode 3 ETI-data stream can be decoded and used without having to consider the data format of the existing ETI-data. As such, any ETI-data can be demodulated and sent out in a separate receiver device without each additional processing. DAB mode three-signal conversion is achieved in accordance with the present invention by adding a fourth information block per unit of time to any ETI-signal formed of three information blocks. The fourth information block is formed of a dummy-FIB.

The measures set forth in the dependent claims result in the preferred implementation and refinement of the method or apparatus set forth in claims 1 and 7. Particularly preferably, the fourth information block comprises a "End Marker" field at the beginning. The " end marker " -field ensures that the decoding device of the receiving device does not have to evaluate important data in the fourth information block.

In another aspect of the invention, in order to achieve the required 256 bit length of the information block, the fourth information block is filled by padding following the "end marker" -field.

In another preferred embodiment of the present invention, redundancy checking is performed at the end of the fourth information block. In the redundancy check, a 16-bit data word for the content of the fourth information block is periodically calculated by a predetermined algorithm.

In another embodiment of the present invention, one or more useful groups of information are placed in place of padding in the fourth information block. The information group can be copied from other information blocks and placed in the fourth information block. At least one useful information group is placed in front of the "end marker"-field in the fourth information block. For example, the sub channel-combination may be copied into the fourth information block as a group of information. In this way, preferably, the bandwidth of the mode 3 DAB-signal can be better used for the transmission of data.

According to the dependent claim 10, an apparatus for converting any ETI-signal to a mode 3 DAB-signal is connected to a transmitting apparatus. The transmitting device is formed by DAB mode 3 coding to transmit the ETI-data stream, and transmits the corresponding ETI-data stream received and decoded by the DAB broadcast receiver.

Embodiments of the present invention are shown in the drawings and described in detail below.

In Fig. 1, for a better understanding of the present invention, a known DAB (with a transmission frame 10), as defined in the European standard (wireless communication series) ETSI EN 300 401 V1.4.1 (2006-01), Digital Audio Broadcasting) schematically shows the structure of an ETI-signal. In the transmission frame 10 of the ETI-signal, a synchronization channel Synchr Ch, a fast information channel FIC and a main service channel MSC are arranged.

Synchr Ch is used for basic demodulation, in particular for transmission frame synchronization, for automatic frequency control, for fixing channel conditions, and for transmission-confirmation.

Up to 12 fast information blocks (FIB) are arranged in the fast information channel (FIC) according to the selected transmission mode (DAB mode). For example, all 12 FIB blocks with 96 ms transmission frames are placed in DAB mode 1, three FIB blocks with 24 ms transmission frames are placed in DAB mode 2, and 24 ms transmission frames are placed in DAB mode 3. Four FIB blocks are placed, and six FIB blocks are disposed in DAB mode 4 with a transmission frame of 48 ms.

The main service channel (MSC) is used for multiplex function, time-, data- and other basic functions.

The present invention relates, for example, to a method or apparatus capable of converting any ETI-signal having DAB mode 1, 2 or 4 into an ETI-signal having DAB mode 3.

An exemplary transmission frame 10 of an ETI-signal with DAB mode 2 is shown in FIG. 1. Three information blocks (FIB) are arranged in a fast standard channel (FIC) per unit of time in the transmission frame 10. Information blocks (FIBs) are represented by FIB 1, FIB 2 and FIB 3. As described above, the synchronization channel Synchr Ch is disposed in front and the main service channel MSC is disposed in the rear. As a time unit, 24 ms are determined for the fast information channel (FIC) and the main service channel (MSC), that is, data of three information blocks (FIB) and the main service channel (MSC) are transmitted within 24 ms, respectively.

As can be seen further in FIG. 1, each information block (FIB 1, FIB 2, FIB 3) has a block length of 256 bits. Multiple information groups FIGs may be arranged within the block length, in which case each information group FIG comprises a head portion and a data field.

In the fast information channel (FIC), the transmission rate and the transmission rate are relatively small. Individual information blocks (FIBs) are allocated to so-called Common Interleaved Frames (CIFs) transmitted in the main service channel (MSC) according to the DAB mode, and each of the three information blocks (FIBs) is in the CIF-range. Is assigned.

As described above, DAB modes 1, 2, or 4 may be divided into groups of three information blocks (FIB), respectively. In this way, the DAB modes are interconverted.

In contrast, in DAB mode 3, four information blocks (FIBs) are required. In order to enable conversion to DAB mode 3, according to the invention, a fourth information block 30 is added, in particular when converting an ETI-signal of DAB mode 1, 2 or 4 into an ETI-signal having DAB mode 3. The fourth information block 30 is represented by a dummy-FIB. The transformation is explained in more detail by FIG.

The conversion of the ETI-signal shown in FIG. 1 from DAB mode 2 to DAB mode 3 is shown in FIG. 2. As can be seen in FIG. 2, the converted new ETI-signal of DAB mode 3 includes three information blocks (FIB 1, FIB 2, FIB 3) and a fourth information block 30 denoted as dummy-FIB. do. A DAB mode 3 ETI-signal, transformed by this configuration, is given, which signal is in particular derived from any ETI-signal having DAB mode 1, 2 or 4. To ensure correct assignment of existing ETI-signals in DAB mode 2, the data in the synchronization channel (Synchr Ch) and the main service channel (MSC) is adjusted accordingly. Thus, information block 30 is used to substantially form the structure of the normal ETI-signal of DAB mode 3. By means of the conversion according to the invention, the requirements for the ETI-signal of DAB mode 3, determined in the European standard, can be met very simply.

In another embodiment of the present invention, in the same manner, for example, similarly to the above-described ETI-signal of DAB mode 2, each arbitrary ETI-signal is divided by adding and adding FIB blocks by the method according to the invention. Can be converted to ETI signal of DAB mode 3.

In the DAB mode 1 signal, the 12 FIB blocks are divided into four fast information channels (FICs), each with three FIB blocks, and each dummy-block is added, so that each information for a new ETI-signal of DAB mode 3 is added. The channel FIC includes four FIB blocks.

In the DAB mode 4 signal, six FIB blocks are divided into a fast information channel (FIC) each having three FIB blocks, and each dummy-block is added, so that each information channel (for each new ETI-signal of DAB mode 3) FIC) includes four FIB blocks.

3 schematically shows how the fourth information block 30 (dummy-FIB) is structured in detail.

In the fourth information block 30 an "end marker" 31 is set in the block field at the start of the information block 30. The "end marker" field 31 is filled with 1, for example. Since the fourth information block 30 has data including 256 bits like the general information block FIB, the remaining data fields of the information block 30 are filled by padding. Padding is the filling of data fields with useless data. In this case, the data field is filled with "0".

Cyclic Redundance Check (CRC) is performed in accordance with a predetermined algorithm at the end of the fourth information block 30, thereby ensuring that the required 256 bits of the fourth information block 30 are provided.

Thus, the fourth information block 30 is structured according to the same scheme as specified in setting the relevant standard for all information blocks FIB.

By means of another method according to the invention for converting any ETI-signal to an ETI-signal in DAB mode 3, preferably, any ETI-signal can be sent by the same transmitting apparatus.

An alternative solution for the fourth information block 30 is shown in FIG. 4. Unlike the embodiment of the present invention according to FIG. 3, at the start of the fourth information block 30 one or more information groups FIG have been added to the existing information blocks FIB, e.g. information blocks FIB 1, FIB 2, Copied from FIB 3). As can be seen in FIG. 4, two information groups (FIGs), labeled FIG 1 and FIG 2, are placed at the beginning of the fourth information block 30. The information groups FIG 1, FIG 2 contain useful information, such as information on sub-channel organization, instructions on the data type or any other information. The "end marker" 31 is set following the last information group FIG 2, and "1" is used the same. If an empty data field is to be provided within a 256 bit long data field of the fourth information block 30, the data field is filled with "0" by padding 32 in a manner similar to that described above in FIG. Subsequently, a redundancy check 33 is again made by the CRC-algorithm according to FIG. 3, in which case the CRC field is included in the 256-bit length data field of the fourth information block 30.

By filling the fourth information block 30 with useful data of the information group (FIG), the bandwidth of the DAB-transport channel is preferably used better. Thus, more digitized data can be transmitted.

Indeed, it has been found that the reception characteristics of a DAB-receiver may be affected by the DAB mode very severely depending on the situation. Thus, existing test audio stored in other DAB modes must be converted to an ETI-data stream with DAB mode 3, thereby achieving higher test blocking. This is because four information blocks (FIB) can be transmitted only in DAB mode 3 within a time unit of 24 ms.

5 is a schematic block diagram of an apparatus 40 according to the invention for converting any ETI-signal to an ETI-signal in DAB mode 3. In block 41 an ETI-data stream with DAB modes 1, 2 or 4 is provided. Similar to Fig. 1, the existing ETI-data should be transmitted according to DAB mode 3. As described above in accordance with FIGS. 2-4, the data is converted to DAB mode 3 at block 42. In block 43 a transformed EIT data stream of the transformed DAB mode 3 is provided. Modulation of the DAB mode 3 data stream is then performed at block 44. Since the modulated data stream is guided and transmitted to the transmitting device 45, the data stream may be received by the DAB broadcast receiver.

1 is a schematic diagram illustrating the formation of an ETI-signal with DAB mode 2, as known in the prior art.

2 is a schematic diagram of an apparatus according to the invention for a DAB mode 3 ETI-signal.

3 is a schematic diagram illustrating an embodiment of the present invention for a fourth information block;

4 is a schematic diagram showing another embodiment according to the present invention for the configuration of a fourth information block;

5 is a block circuit diagram of an apparatus according to the present invention for converting any ETI-signal to a DAB mode 3 signal.

Claims (10)

For example, a method for converting any ETI-signal having DAB mode 1, 2 or 4 into an ETI-signal having DAB mode 3, The ETI-signal to be converted includes three information blocks (FIB) each having a 256-bit length, and the converted ETI-signal of the DAB mode 3 has four information blocks per time unit. , A fourth information block 30 is added following the three information blocks FIB 1, FIB 2, FIB 3 to form an ETI-signal of DAB mode 3, The fourth information block (30) is preferably formed in a dummy-FIB, the method for converting any ETI-signal into an ETI-signal having DAB mode 3. 2. Converting any ETI-signal into an ETI-signal with DAB mode 3 according to claim 1, characterized in that the fourth information block 30 has a " end marker " field 31 at its beginning. Way. 3. The fourth information block (30) according to claim 2, wherein the fourth information block (30) is achieved by padding subsequent to the " end marker " field (31), including 256 CRC fields of the fourth information block (30). Characterized in that it is filled until the ETI-signal has a DAB mode 3. 4. The ETI- any one of claims 1 to 3, characterized in that a redundancy check (CRC) is performed at the end of the fourth information block (30). Method for converting to a signal. 5. The method according to claim 1, wherein at least one information group (FIG) of another information block (FIB) is copied before the " end marker " field 31 in the fourth information block. Method for converting any ETI-signal to an ETI-signal having DAB mode 3, characterized in that it is registered or registered. 6. The method according to claim 5, wherein a subchannel combination is copied as a group of information to be copied, for example, into an ETI-signal having DAB mode 3. Apparatus for converting any ETI-signal having a DAB mode 1, 2 or 4 for the method according to any one of claims 1 to 6 into an ETI-signal having a DAB mode 3, An apparatus 40 for adding the fourth information block 30 to be converted into three information blocks (FIB1, FIB 2, FIB 3) per time unit to an ETI-signal of DAB mode 1, 2 or 4 is formed. , Wherein the fourth information block (30) is preferably formed as a dummy-FIB. 10. Apparatus for converting any ETI-signal into an ETI-signal having DAB mode 3. 8. Any ETI according to claim 7, characterized in that the fourth information block (30) has an "end marker" field (31) and the remaining portion of the fourth information block (30) is filled by padding. -An apparatus for converting the signal into an ETI-signal having DAB mode 3. 9. A method according to claim 7 or 8, wherein at least one group of information (FIG) is added before the " end marker " field 31, the at least one group of information (FIG) from the available information block (FIB). And copy any ETI-signal to an ETI-signal having DAB mode 3. 10. The apparatus according to any of claims 7 to 9, wherein the device comprises an ETI interface 40, the ETI interface 40 being connected to a transmitting device 45, and the transmitting device 45 And transmit an ETI-data stream of DAB mode 3 to receive an DAB-broadcast, wherein the ETI-signal is converted to an ETI-signal having DAB mode 3.

Images