1、 ETSI TS 102 980 V1.1.1 (2008-09)Technical Specification Digital Audio Broadcasting (DAB);Dynamic Label Plus (DL Plus);Application specificationEuropean Broadcasting Union Union Europenne de Radio-Tlvision EBUUER ETSI ETSI TS 102 980 V1.1.1 (2008-09)2Reference DTS/JTC-DAB-51 Keywords DAB, broadcast,
2、 text ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copies of the present document
3、 can be downloaded from: http:/www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute,
4、the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI d
5、ocuments is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written
6、permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2008. European Broadcasting Union 2008. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTM, TIPHONTM, the TIPHON logo and the ETSI logo are Trade Marks of ETSI r
7、egistered for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI TS 102 980 V1.1.1 (2008-09)3Contents Intellectual Property Rights 4g3Foreword . 4g31 Scope 5g32 References 5g32.1 Normative references
8、 . 5g32.2 Informative references 5g33 Definitions and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 6g34 Introduction 6g35 DL Plus objects 8g35.1 Content types 8g35.2 Linking of DL Plus objects. 9g35.2.1 Aggregating DL Plus objects (category Item) 9g35.2.2 Compiling DL Plus objects into
9、tables . 10g35.2.3 Linking a Descriptor object to another DL Plus object . 11g35.3 Life time, updating and deletion . 12g35.3.1 Updating objects . 12g35.3.2 Deleting objects 12g36 DL Plus tags . 12g36.1 Creating a dummy object . 13g36.2 Creating a delete object 13g37 Command structure 13g37.1 Transp
10、ort of segmented DL commands 13g37.2 DL Plus commands: general structure 15g37.3 The DL Plus tags command . 16g37.4 Transmission sequence . 16g38 Receiver behaviour . 17g38.1 Basic requirements . 17g38.2 History 18g3Annex A (normative): List of DL Plus content types 19g3Annex B (informative): Use ca
11、ses and Examples 22g3B.1 Use cases 22g3B.2 Examples for navigation and display use . 26g3B.3 Prioritization . 27g3Annex C (informative): DL Plus and the compatibility with RDS/RT+ 28g3Annex D (informative): Bibliography . 29g3History 30g3ETSI ETSI TS 102 980 V1.1.1 (2008-09)4Intellectual Property Ri
12、ghts IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essentia
13、l, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has bee
14、n carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by Joint T
15、echnical Committee (JTC) Broadcast of the European Broadcasting Union (EBU), Comit Europen de Normalisation ELECtrotechnique (CENELEC) and the European Telecommunications Standards Institute (ETSI). NOTE 1: The EBU/ETSI JTC Broadcast was established in 1990 to co-ordinate the drafting of standards i
16、n the specific field of broadcasting and related fields. Since 1995 the JTC Broadcast became a tripartite body by including in the Memorandum of Understanding also CENELEC, which is responsible for the standardization of radio and television receivers. The EBU is a professional association of broadc
17、asting organizations whose work includes the co-ordination of its members activities in the technical, legal, programme-making and programme-exchange domains. The EBU has active members in about 60 countries in the European broadcasting area; its headquarters is in Geneva. European Broadcasting Unio
18、n CH-1218 GRAND SACONNEX (Geneva) Switzerland Tel: +41 22 717 21 11 Fax: +41 22 717 24 81 The Eureka Project 147 was established in 1987, with funding from the European Commission, to develop a system for the broadcasting of audio and data to fixed, portable or mobile receivers. Their work resulted
19、in the publication of European Standard, EN 300 401 1, for DAB (see note 2) which now has worldwide acceptance. The members of the Eureka Project 147 are drawn from broadcasting organizations and telecommunication providers together with companies from the professional and consumer electronics indus
20、try. NOTE 2: DAB is a registered trademark owned by one of the Eureka Project 147 partners. ETSI ETSI TS 102 980 V1.1.1 (2008-09)51 Scope The present document defines a backward compatible extension of the Dynamic Label feature used in Eureka-147 Digital Audio Broadcasting (DAB) (EN 300 401 1). 2 Re
21、ferences References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. Non-specific reference may be made only to a complete document or a part thereof and only in the following
22、 cases: - if it is accepted that it will be possible to use all future changes of the referenced document for the purposes of the referring document; - for informative references. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbo
23、x.etsi.org/Reference. For online referenced documents, information sufficient to identify and locate the source shall be provided. Preferably, the primary source of the referenced document should be cited, in order to ensure traceability. Furthermore, the reference should, as far as possible, remain
24、 valid for the expected life of the document. The reference shall include the method of access to the referenced document and the full network address, with the same punctuation and use of upper case and lower case letters. NOTE: While any hyperlinks included in this clause were valid at the time of
25、 publication ETSI cannot guarantee their long term validity. 2.1 Normative references The following referenced documents are indispensable for the application of the present document. For dated references, only the edition cited applies. For non-specific references, the latest edition of the referen
26、ced document (including any amendments) applies. 1 ETSI EN 300 401: “Radio Broadcasting Systems; Digital Audio Broadcasting (DAB) to mobile, portable and fixed receivers“. 2 IEC 62106: “Specification of the radio data system (RDS) for VHF/FM sound broadcasting in the frequency range from 87,5 to 108
27、,0 MHz“. 2.2 Informative references The following referenced documents are not essential to the use of the present document but they assist the user with regard to a particular subject area. For non-specific references, the latest version of the referenced document (including any amendments) applies
28、. Not applicable. ETSI ETSI TS 102 980 V1.1.1 (2008-09)63 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in EN 300 401 1 and the following apply: category: content types characterizing DL Plus objects are grouped in categories
29、content type: DL Plus objects are characterized by their content types and so can be selected by the listener if offered so by the receiver Dynamic Label (DL): feature of DAB for providing a programme with text messages; it also provides commands, e.g. for presentation on the receiver terminal Dynam
30、ic Label (DL) message: text messages that are associated with a programme service and are transmitted in the PAD part of that programme NOTE: One single DL message should be sufficient for complete comprehension by a (human) listener. Dynamic Label Plus (DL Plus): extension of the Dynamic label feat
31、ure; it allows storing and filtering parts of the text (sent as DL messages) in the receiver terminal as DL Plus objects, which then can be selected and accessed by the listener independently from the currently transmitted DL messages DL plus command: specific structure of DL commands, which is defi
32、ned within this specification and which is used for carrying the DL tags necessary for identifying DL Plus objects DL plus object: text string created in a receiver with a defined content type to allow selection by the listener DL plus tag: contains the location and the content type of a DL Plus obj
33、ect carried in a corresponding Dynamic Label Message programme item: time-slice of a programme, for example, a piece of music or a documentary report 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: DAB Digital Audio Broadcasting DL Plus Dynamic Label Pl
34、us DL Dynamic Label DMB Digital Multimedia Broadcasting PAD Programme Associated Data RDS Radio Data System RT+ RadioText Plus 4 Introduction Digital Audio Broadcasting DAB 1 provides the text feature Dynamic Label (DL) which allows the service provider to send text messages with information such as
35、 track playing, now/next, news headlines, weather, sport results, etc. To serve all the different interests of listeners, the service provider has to send DL messages frequently and with different content, one after the other, each message replacing the one before. The more information he wants to p
36、rovide, the more frequently he has to update the messages, and the less time is left for presentation of a message on the display and for reading by a listener. So it will happen that a listener has to wait until specific information he is interested in shows up and - even worse - has to observe the
37、 display continuously in order not to miss the instant when the desired information is displayed. DL Plus solves this dilemma by allowing the listener to select the kind of information he is interested in. For that purpose DL messages are complemented by tags which identify specific content of the D
38、L message by its content type. ETSI ETSI TS 102 980 V1.1.1 (2008-09)7Users can select the content types of information to be presented; they do not need to read, or even be aware of, the complete stream of DL messages. DL Plus is a backwards compatible extension of the DL feature: the transmitted ta
39、gs are not visible in the DL message so that listeners with receivers without a DL Plus decoder still view the DL messages as before. For the broadcaster, the additional data rate (for tag transmission) is significantly less than the data rate necessary for text. A receiver can use the content class
40、ification and tagging in two different ways: by improving the presentation of the text messages and/or by providing the information to other applications and devices. DL messages may contain any kind of text: some will be quite general - news headlines, for example - whilst others relate directly to
41、 the audio - artist and title information, for example. In this latter case, special consideration is given to allow correct grouping of all the different item-related information and an unambiguous reference to the audio of the respective programme item. This timing information may also be used to
42、ensure that the text and audio make sense for time-shifted programmes. DL Plus, by identifying text by content type, can automatically provide information to other devices like mobile phones, PDAs, PCs and personal audio players. This means listeners can interact with the radio station more easily b
43、ecause the transfer of telephone and SMS numbers, web addresses and event information may be done with a single click. DL Plus is designed to stimulate the integration of radio with other devices in order to strengthen the competitiveness of radio with respect to other media and to gain new and grea
44、ter audiences. Figure 1 illustrates the way that a DL Plus decoder in a receiver processes the received DL message and DL Plus tags to create DL Plus objects that are then displayed or stored. In this example, the DL message contains the title and artist of a music item that is currently on air. The
45、se two pieces of text are tagged so that the receiver may identify them and create the DL Plus objects. You are listening to “House of the Rising Sun” by Eric Burdon DL Plus tag Content Type: Title Start marker: 22 Length marker: 22 DL message Title Artist DL Plus tag Content Type: Artist Start mark
46、er: 50 Length marker: 10 DL Plus object Content Type: Title Text: House of the Rising Sun DL Plus object Content Type: Artist Text: Eric Burdon Figure 1: Simplified schematic of DL Plus object creation from DL message and DL Plus tags The DL Plus tags are carried in the PAD using the same mechanism
47、as the DL message but utilizing the command feature of the DL application. Up to four DL Plus tags may correspond to a single DL message. DL Plus tags contain a content type, a start marker and a length marker to identify the piece of text to be assigned to a DL Plus object. The DL Plus objects may
48、contain additional data fields, if so required by the receiver functionality. It is recommended to store a time stamp indicating the time when the corresponding DL message was received (see clause 9). This allows history oriented handling of the DL Plus objects, e.g. by assembling a play list with t
49、he last received programme items. ETSI ETSI TS 102 980 V1.1.1 (2008-09)8DL Plus offers similar functionality to the FM-RDS RT+ feature (see annex C). 5 DL Plus objects DL Plus objects are created in receivers from DL messages and associated DL Plus tags. Therefore the DL Plus objects inherit some basic properties from the DL messages they are based on: The text of DL Plus objects shall be contained within a single DL message, and so has a maximum text length determined by the limit of 128 bytes. The throughput of DL Plus objects is limited by the th
