EP1784934A1 - Method and device for the transmission of additional data, relating to alternative r digital transmission frequencies, in an analog radio transmission system - Google Patents
Method and device for the transmission of additional data, relating to alternative r digital transmission frequencies, in an analog radio transmission systemInfo
- Publication number
- EP1784934A1 EP1784934A1 EP05753998A EP05753998A EP1784934A1 EP 1784934 A1 EP1784934 A1 EP 1784934A1 EP 05753998 A EP05753998 A EP 05753998A EP 05753998 A EP05753998 A EP 05753998A EP 1784934 A1 EP1784934 A1 EP 1784934A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- amds
- data
- format
- alternative
- sdc
- 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.)
- Granted
Links
Classifications
-
- 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
- H04H20/36—Arrangements for simultaneous broadcast of plural pieces of information for AM broadcasts
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/20—Arrangements for broadcast or distribution of identical information via plural systems
- H04H20/22—Arrangements for broadcast of identical information via plural broadcast systems
Definitions
- the present invention relates to a method and a device for transmitting additional data in an analog radio transmission system, the additional data containing information regarding alternative transmission frequencies of the respective program, and the alternative transmission frequencies relating to digital radio transmission systems.
- the alternative transmission frequencies for digital broadcasting systems are transmitted in AMDS (Amplitude Modulation Data System) format by mapping these SDC (Service Description Channel) data into AMDS format by mapping.
- AMDS Amplitude Modulation Data System
- a digital broadcasting system is known that is transmitted, for example, on conventional AM frequencies and has, inter alia, a Service Description Channel (SDC), which is described on pages 63 to 78 as Chapter 6.4.
- SDC Service Description Channel
- the data is divided into SDC blocks and transmitted. Each block contains one
- the AFS index is an unsigned binary number between 0 and 15, which indicates the number of transmissions of so-called superframes, which separates this SDC block from the next, with identical content, if in the Identification field of the Fast Accsess Channel which is set to O-Symobl
- the AFS index should be identical for all SDC blocks and can be changed, for example, during a reconfiguration.
- the data field is divided into a variable number of data entities. This can include an end marker as well as padding bits that fill in empty fields. The length of this data field depends on the selected transmission mode, which determines the robustness of the transmission system.
- the check field also known as Cyclic Redundancy Check (CRC), contains a 16-bit long CRC data word, which is calculated using the AFS index and the data field.
- CRC Cyclic Redundancy Check
- Frequency range both an analog and digital signal can be sent. Especially on shortwave, the different frequency ranges have different propagation ratios. It may therefore be necessary for a receiver that is initially set to a DRM program and loses the signal there to change to another band, but in which the program is only transmitted in analog mode. In order to continue to be able to reference possible alternative frequencies, especially those on which digital transmission is possible, the AMDS is used in the analog transmission.
- the core of the present invention is to provide a method and a device with which in an analog radio transmission system alternative frequencies of the currently set transmitter can be transmitted, wherein these alternative transmission frequencies may relate to the same frequency band but refer to a digital broadcasting system, in particular Digital Radio Musice (DRM).
- DRM Digital Radio Mondiale
- the alternative transmission frequencies for digital broadcasting systems are transmitted in Amplitude Modulation Data System (AMDS) format.
- AMDS Amplitude Modulation Data System
- the digital broadcasting system in the DAB (Digital Audio Broadcast) format or in the DRM (Digital Radio Musice) format or DVB-T (Digital Video Broadcast - Terrestrial) format or in iBiquity format or in the IBOC (La Band On Channel) format or in AM / FM format or UMTS (Universal Mobile Telecommunications System) format is broadcast.
- DAB Digital Audio Broadcast
- DRM Digital Radio Mondiale
- DVB-T Digital Video Broadcast - Terrestrial
- IBOC Long Band On Channel
- AM / FM format or UMTS Universal Mobile Telecommunications System
- the data transmitted in the AMDS format is SDC data, which is transferred by means of mapping into the AMDS format.
- the so-called Service Description Channel is provided by means of which additional data can be transmitted.
- This SDC data received from a combination receiver, i. H. from a receiver that can receive both analog AM signals and digital DRM signals are evaluable by this without additional effort. Therefore, it is provided to transmit data by means of the SDC format, which are however transmitted for transmission in analog broadcast transmission systems in the so-called AMDS format by means of mapping.
- the AFS index of the SDC blocks is taken over into the data fields of the AMDS blocks. Furthermore, it is advantageous that the Bits of the test field of each AMDS group are generated from the data fields of the acquired SDC data blocks.
- a dateribit of each AMDS group indicates whether it is the first or a following AMDS group of a plurality of consecutively transmitted AMDS groups that together contain the information of an SDC block.
- the first data bit of the first block of an AMDS group that is to say the m35 bit of the first AMDS block
- the AMDS blocks are consecutively numbered by means of a counter. It is particularly advantageous that the continuous
- Numbering of each AMDS group is contained in one or more dedicated AMDS data bits.
- the one or more reserved AMDS data bits containing the consecutive numbering of each AMDS group are the data bits following the first data bit m35 of the first AMDS block of an AMDS group, ie the
- the consecutive numbering of each AMDS group is contained in an AMDS data field reserved for this purpose, which consists of several reserved AMDS data bits. Furthermore, it is advantageous that the consecutive numbering of the AMDS groups is carried out by means of synchronization by calculating the content of the test fields by cyclic block codes from the content of the data fields, adding offset pairs to the test fields, calculating pairwise syndromes from the offset values and that the respective content of the AMDS groups can be determined on the basis of the pairwise syndromes obtained.
- the device includes a calculation device which determines depending on the information contained in the AMDS data test words for error detection and error correction and inserts in the test fields of the AMDS test fields.
- the device has a counter which consecutively numbers the AMDS blocks and inserts the numbering in an AMDS data field reserved for this purpose.
- a receiver for receiving and reproducing analog and digitally transmitted broadcasting signals, wherein the receiver, when reproducing an analog broadcasting signal, receives the additional data transmitted in AMDS format with respect to alternative broadcasting frequencies on which the same program is digitally transmitted; evaluates and in the presence of alternative transmission frequencies on which the same program is transmitted digitally, automatically switches to the digitally transmitted alternative frequency.
- the receiver stores all received additional data relating to alternative transmission frequencies in a database and selects from this database the alternative frequency at which the set radio program is best received.
- the alternative frequencies are searched in a predetermined order for their transmission type, in particular in the order DAB, DRM, FM, AM.
- FIG 1 shows the structure of the AMDS (Amplitude Modulation Data System) format
- Figure 2 shows the structure of the SDC (Service Description Channel) format, as is the case with DRM
- FIG. 3 shows the mapping of the SDC information onto AMDS groups
- FIG. 4 shows the implementation of a counter
- FIG Figure 5 is a schematic Darstellimg an embodiment of the inventive device.
- FIG. 1 shows schematically the structure of the amplitude modulation data system.
- An AMDS group 1 consists of 94 bits, this AMDS group being equally divided into an AMDS block 2 and an AMDS block 22 of 47 bits each.
- Such a 47-bit AMDS block 2 is further subdivided into a data field 3 with 36 bits and a test field 4 with 11 bits, wherein the data field is the
- test field 4 contains a check word, which is calculated by means of a cyclic code from the data field 3 and is used for error detection and error correction.
- the 36-bit data field 3 is further subdivided into AMDS data bits 5, which begin with the designation m35 and are named until mOO, the last AMDS data bit of the user data. That concludes that
- Check field 4 which consists of 11 AMDS Priifbits 6, which are numbered beginning with clO to cOO.
- This test field 4 contains information which has been calculated from the data field 3 by means of a cyclic block code.
- FIG. 2 shows the construction of a Short Description Channel (SDC) block, as used in the digital broadcasting system DRM (Digital Radio Mondiale).
- SDC Short Description Channel
- information is transmitted that, for example, refers to alternative frequencies of the same program, so that when receiving quality degradation of the currently tuned radio program another frequency of the same or a different frequency band can be specified, which currently transmits the same program.
- the digital radio program is also able to refer to either alternative digital frequencies or frequencies at which the same program is transmitted by means of analog broadcast transmission methods such as FM or AM.
- analog broadcast transmission methods such as FM or AM.
- the same radio programs will have to be broadcast both in analog and digital form, since not every listener has a digital receiver.
- the SDC block 7 consists of an AFS Jhdex 8, which consists of 4 bits.
- AFS-Ihdex a data field 9 is transmitted, which can be variable in length and transmits the payload.
- the data field 9 from different numbers of data blocks 11, which are numbered from 1 to N, consist, depending on which transmission mode and which SDC mode is currently being sent.
- the data field 9 is followed, within the SDC block 7, by a test word 10 which consists of 16 bits and is also referred to as CRC (cyclic redundancy check).
- This check word 10 is calculated from the bits of the AFS Ihdex and the data field and is used for error detection and error correction of the transmitted data.
- each SDC block 7 consists here of an AFS index
- the SDC block 7 contains padding bits 12 and a 16-bit long cyclic redundancy check word 13.
- the AFS index information in block 8 and the information of the data blocks 1 to N 1 lin are transmitted to the SDC data AMDS data structure taken over, with the Paddingbits 12 and the CRC bits 13 are disregarded.
- a AMDS group 1 contains two AMDS blocks with v are each 47 bits, each AMDS group useful bits m35 to MoO on, thereafter 11 AMDS check bits ClO to COO, and again for the AMDS Block236 useful bits m35 to MoO, and 11 check bits of the AMDS block 2 clO to cOO. Since the first payload bit m35 of the first block of the AMDS Gurppe 1 is reserved to the beginning of a
- the first AMDS user bit m35 of the block 1 of an AMDS group 1 is not described with SDC data.
- the information of the AFS index 8 is therefore written in the ⁇ MDS data bits m34 and following of the first AMDS block of the AMDS group 1.
- the data blocks 1 to N 11 following the AFS-Ihdex 8 are continuously integrated into the AMDS
- Data bits 5 are written, in which case the AMDS data bits m34 to mOO of the AMDS block 1 and the AMDS data bits m35 to m00 of the AMDS block 2 are available. These AMDS data bits are interrupted by the AMDS check bits cl0 to c00, which are each calculated and written in response to the preceding AMDS data bits. Since it is not possible from the data scope of an SDC block, the user data of an SDC block completely into an AMDS group, several AMDS groups 1 are hinterei ⁇ anderhhur brieflyt until the full payload of an SDC block is housed in AMDS groups 1.
- the first AMDS data bit m35 of the first AMDS block can be used by setting the m35 bit of this first AMDS block of an AMDS group to 1, if it is the first AMDS group that starts the AMDS group Contains user data of an SDC block or by setting the m35 bit of the first AMDS block of an AMDS group to 0 to indicate that this AMDS group is a continuation of a previous AMDS group concerning the same SDC block ,
- the check bits c1 to c006 of the AMDS groups 1 are calculated and transmitted as a function of the preceding useful bits m35 to m00. Furthermore, it makes sense to number the AMDS groups, since a transmission in the AM band is frequently disturbed and therefore multiple transmission of the AMDS groups in succession is advantageous. By numbering the AMDS groups, it is possible to determine which AMDS groups are consecutive with the same
- the AMDS groups containing the same information can also be transmitted several times and possibly at intervals, which advantageously requires a 3 or 4 bit counter.
- FIG. 4 shows such a counter, in which an AMDS group 1 is shown, which consists of two consecutive AMDS blocks, each AMDS group
- Block of useful bits m35 to mOO and subsequently from the check bits clO to cOO exists. Since the first data bit of the first AMDS block of the AMDS group 1 (m35) is reserved to indicate the beginning or continuation of an SDC block, the subsequent 3 bits or 4 bits, namely, the bits m34 to m32 and m34, respectively to m31 of the first AMDS block of the AMDS group for an AMDS group counter so that the AMDS useful bits m31 to mOO or m30 to mOO of the first AMDS block and the data bits m35 to mOO of the second AMDS block of the AMDS group are available for the actual information.
- the AMDS size counter which may for example be realized by means of the useful bits m34 to m32 of the first AMDS block, advantageously starts with a 0 symbol to indicate the beginning of an SDC block.
- the following AMDS groups contain incremented counter symbols to detect when a new SDC block is transmitted.
- the counter implicitly with the synchronization mechanism by additionally defining pairs of offset words, the number of offset word pairs corresponding to the number of groups the counter is to distinguish.
- the offset word pairs are added in the receiver to the test words of the two blocks that make up an AMDS group. Groups with the same content use the same offset word pairs.
- the received bit stream is sent to the decoder
- the next 47-bit block is fed to the decoder.
- the second syndrome of the syndrome pair arises, synchronization is achieved.
- the corresponding offset words are then added and the blocks fed to the decoder ⁇ .
- syndrome 0 occurs, the block is error free and can be decoded. It should be noted that in successive blocks each a related pair of offset words is used. If the synchronization has taken place, then in the following block each of the first offset words must be used.
- Offset word pairs are added until a syndrome 0 decoding is possible. Then the next following block with the associated second offset word of the offset word pair can be decoded.
- FIG. 5 shows a schematic block diagram of a device according to the invention.
- the mapping device 14 SDC blocks are supplied for this purpose, which are output after processing as AMDS groups.
- the SDC blocks supplied to the mapping device 14 enter a truncation device 15 in which the padding bits 12 and the check bits (CRC) 13 of the SDC blocks are removed. Thereafter, the output of the cutter 15 a sketchbiteinfiige worn 16 supplied.
- CRC check bits
- the output signal of the clipping device 15 is fed to a check bit calculator 17 in which test bits cl0 to cOO are calculated from the AMDS data fields m35 to mOO which are fed to the check bit inserter 16 which supplies the calculated check bits cl0 to cOO of the test field 4 to the designated ones Places of the AMDS block are inserted.
- the output of the check bit inserter 16 is passed to the counter inserter 18.
- the counter inserter 18 is supplied with signals to a counter 19, which numbers the individual AMDS blocks and applies this numbering to the counter inserter 18, which inserts them into the payload bits of the first slot bits of the first
- Insert blocks of an AMDS group so in the case of a 3-bit counter at the locations m34 to m32 of the first block. If a 4-bit counter is used, bits m34 to m31 of the first block of an AMDS group are used for this purpose.
- the first payload bit m35 of the block 1 of an AMDS group is set to 0 when this AMDS group contains the beginning of a new SDC block, or the m35 bit of the first block of the AMDS group becomes 0 is set if this AMDS group is a continuation of the information of an SDC block of a preceding AMDS group.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004032286A DE102004032286A1 (en) | 2004-07-02 | 2004-07-02 | Method and device for transmitting additional data in an analog radio transmission system |
PCT/EP2005/052478 WO2006003063A1 (en) | 2004-07-02 | 2005-05-31 | Method and device for the transmission of additional data, relating to alternative r digital transmission frequencies, in an analog radio transmission system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1784934A1 true EP1784934A1 (en) | 2007-05-16 |
EP1784934B1 EP1784934B1 (en) | 2012-09-26 |
Family
ID=34970866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05753998A Expired - Fee Related EP1784934B1 (en) | 2004-07-02 | 2005-05-31 | Method and device for the transmission of additional data, relating to alternative r digital transmission frequencies, in an analog radio transmission system |
Country Status (7)
Country | Link |
---|---|
US (1) | US8009703B2 (en) |
EP (1) | EP1784934B1 (en) |
KR (1) | KR101013646B1 (en) |
CN (1) | CN1981466B (en) |
CA (1) | CA2540976C (en) |
DE (1) | DE102004032286A1 (en) |
WO (1) | WO2006003063A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010028070A1 (en) * | 2010-04-22 | 2011-10-27 | Robert Bosch Gmbh | Digital object outputting method involves receiving two time-sequentially transmitted digital data packets, which are assigned program over primary radio end channel |
JP5289621B2 (en) * | 2010-07-28 | 2013-09-11 | 三菱電機株式会社 | Receiver |
KR101144417B1 (en) | 2010-09-27 | 2012-05-10 | 현대자동차주식회사 | A data communication apparatus using radio frequency and method thereof |
KR101327162B1 (en) * | 2011-02-16 | 2013-11-06 | 한신대학교 산학협력단 | Design of SW Common Receiver for Multi-mode Digital Radios |
CN113726912B (en) * | 2021-11-03 | 2022-02-15 | 深圳市信润富联数字科技有限公司 | Data synchronization method, system and storage medium between cloud end and edge end |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4540849A (en) * | 1983-06-08 | 1985-09-10 | International Teldata Ii Corp. | Meter interface unit for utility meter reading system |
DE4039673C1 (en) | 1990-12-12 | 1992-05-14 | Institut Fuer Rundfunktechnik Gmbh, 8000 Muenchen, De | |
US5588022A (en) * | 1994-03-07 | 1996-12-24 | Xetron Corp. | Method and apparatus for AM compatible digital broadcasting |
US6201798B1 (en) * | 1997-11-14 | 2001-03-13 | Worldspace Management Corporation | Signaling protocol for satellite direct radio broadcast system |
JP2955285B1 (en) * | 1998-09-30 | 1999-10-04 | 松下電器産業株式会社 | Digital audio receiver |
DE69940400D1 (en) * | 1999-06-29 | 2009-03-26 | Sony Deutschland Gmbh | Radio receiver for multiple transmission system |
US6549544B1 (en) * | 1999-11-10 | 2003-04-15 | Ibiquity Digital Corporation | Method and apparatus for transmission and reception of FM in-band on-channel digital audio broadcasting |
US20050015198A1 (en) | 2001-11-06 | 2005-01-20 | Chang-Don Kee | Pseudolite-based precise positioning system with synchronised pseudolites |
KR101006818B1 (en) | 2007-12-12 | 2011-01-10 | 이근진 | Apparatus that decreasing standby power of electronic appliance and receptacle |
-
2004
- 2004-07-02 DE DE102004032286A patent/DE102004032286A1/en not_active Withdrawn
-
2005
- 2005-05-31 WO PCT/EP2005/052478 patent/WO2006003063A1/en active Application Filing
- 2005-05-31 US US11/631,198 patent/US8009703B2/en not_active Expired - Fee Related
- 2005-05-31 CA CA2540976A patent/CA2540976C/en not_active Expired - Fee Related
- 2005-05-31 EP EP05753998A patent/EP1784934B1/en not_active Expired - Fee Related
- 2005-05-31 CN CN2005800224815A patent/CN1981466B/en not_active Expired - Fee Related
- 2005-05-31 KR KR1020067027794A patent/KR101013646B1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2006003063A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1784934B1 (en) | 2012-09-26 |
CN1981466B (en) | 2013-06-19 |
CA2540976A1 (en) | 2006-01-12 |
US20100002609A1 (en) | 2010-01-07 |
DE102004032286A1 (en) | 2006-01-19 |
CN1981466A (en) | 2007-06-13 |
CA2540976C (en) | 2013-05-14 |
KR20070036087A (en) | 2007-04-02 |
KR101013646B1 (en) | 2011-02-10 |
WO2006003063A1 (en) | 2006-01-12 |
US8009703B2 (en) | 2011-08-30 |
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