1、BRITISH STANDARD BS EN 62105:2002 Incorporating Corrigendum No. 1 to BS EN 50255:1998 (renumbers the BS EN as BS EN 62105:2002) and incorporating Corrigendum No. 1 to BS EN 62105:2002 Digital audio broadcasting system Specification of the receiver data interface (RDI) The European Standard EN 62105:
2、2002 has the status of a British Standard ICS 33.160.20 BS EN 62105:2002 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 June 1998 BSI 4 October 2002 ISBN 0 580
3、29715 2 National foreword This British Standard is the English language version of EN 62105:2002, including corrigendum May 2002. The UK participation in its preparation was entrusted by Technical Committee EPL/100, Audio, video and multimedia systems and equipment, to Subcommittee EPL/100/1, Receiv
4、ing equipment, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Cat
5、alogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its c
6、orrect application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; moni
7、tor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 17 and back cover. The BSI copyright notice displayed in this document indicates when the document was last
8、issued. Amendments issued since publication Amd. No. Date Comments 13895 Corrigendum No. 1 4 October 2002 Renumbers EN 50255:1997 as EN 62105:2002EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 62105 May 2002 ICS 33.160.20 Descriptors: Radiocommunications, sound broadcasting, digital technics,
9、data transmission, interfaces, receivers, specifications English version Digital audio broadcasting system Specification of the receiver data interface (RDI) Systme de radiodiffusion sonore numrique (DAB) Spcification de linterface de donnes du rcepteur (RDI) Digitales Tonrundfunk-System Spezifikati
10、on fr die Empfnger Datenschnittstelle (RDI) This European Standard was approved by CENELEC on 2000-04-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alter
11、ation. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by tr
12、anslation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Gree
13、ce, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat:
14、 rue de Stassart 35, B-1050 Brussels 2002 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 62105:2002 EEN 62105:2002 BSI 4 October 2002 2 Foreword This European Standard was prepared by Eureka 147 Working Group D, RDI Task Force, and
15、 transferred to the Technical Committee CENELEC TC 206, Broadcast receiving equipment. The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50255 on 1997-10-01. The following dates were fixed: By Technical Board decision D103/153 the text of the International Stan
16、dard IEC 62105:1999, which is identical with EN 50255:1997, was approved by CENELEC as EN 62105 on 2002-04-01. As a consequence EN 50255:1997 is renumbered as EN 62105:2002 by corrigendum May 2002. The following dates were fixed: Contents Page Foreword 2 1 Introduction and general considerations 3 1
17、.1 Introduction 3 1.2 Architecture of the receiving system 3 1.3 Considerations on the data rates of suitable physical interfaces 4 2 RDI frames and frame types 4 3 Embedding of RDI into the IEC 958 interface 5 3.1 RDI frames and IEC 958 subframes 5 3.2 Proposed amendments to IEC 958 6 3.3 Programme
18、 associated data 7 4 Specification of the high capacity mode 7 4.1 Indication of channel/TII 7 4.2 Synchronization to logical frames and FIC reliability 7 4.3 Padding 7 4.4 Main service channel 8 4.5 Fast information channel (FIC) 10 4.6 Transmitter identification information (TII) 11 4.7 Order of t
19、ransmission 14 5 Specification of the low capacity mode 14 6 References 15 Annex A (informative) Specification of the DAB 3 interface 16 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1998-09-01 latest date
20、 by which the national standards conflicting with the EN have to be withdrawn (dow) 1998-09-01 latest date by which the existence of EN 62105 has to be announced at national level (doa) 2002-07-01 EN 62105:2002 BSI 4 October 2002 3 1 Introduction and general considerations 1.1 Introduction The Eurek
21、a 147 digital audio broadcasting system 1 is able to transmit data rates of up to 1.8432 Mbit/s. This data rate occurs if an EEP with a code rate of 0.8 is selected. Audio receivers generally will be capable to decode one or several MSC subchannels, but will not contain decoders for all possible dat
22、a services. Therefore, the source for the data to be carried on the receiver data interface (RDI) is the output bit stream of the channel decoder of a DAB receiver. Dedicated decoders for data applications, computers, etc., but also devices for audio postprocessing and recording can be connected to
23、the DAB receiver through this interface. The intention of specifying the RDI is to provide a common interface for this purpose fulfilling the following requirements. 1) It should be able to carry the full information obtained by the DAB receiver, i.e. the maximum data rate of the MSC, plus the FIC a
24、nd information on the received transmitters (TII) in a suitable format. 2) It should be able to carry data in the format of the output format of recently developed channel decoders and input format of audio source and data decoder ICs (the so-called DAB 3 interface, see Annex A). 3) The RDI specific
25、ation should be independent of any physical interfaces. Interfaces commonly used in consumer electronics should be supported. 4) It should be possible to connect several decoders to a receiver. 5) It should be possible to implement a return channel for receiver control from an application terminal.
26、6) It should be possible to connect the DAB receiver to a data network. This first issue of the RDI specification provides a basic approach to these requirements. A generic coding structure for the data to be carried by the RDI based on a 24 bit RDI frame structure has been developed. All requiremen
27、ts have been met by this coding scheme. Two modes of the RDI have been defined to fulfil requirements (1) and (2). The mode fulfilling requirement (1) is called the “high capacity mode”, the mode fulfilling requirement (2) only is called the “low capacity mode” of the RDI. With respect to requiremen
28、t (3), only the IEC 958 physical layer is supported by now. The mapping of RDI frames onto other physical interfaces including networks requirement (6) and the development of a command language for the return channel requirement (5) are under consideration in the RDI Task Force of WG D. 1.2 Architec
29、ture of the receiving system The RDI interface specified below is intended to be used for the direct connection of one or more data application decoders to DAB receivers (“stand-alone solution”). The architectures envisaged are described in Figure 1. If two or more application decoders are to be con
30、nected to a DAB receiver, each application decoder (except the last one) is required to have an input and output connector for the interface. In this case, the received RDI data stream is relayed directly to the output interface. NOTE Back channel is under consideration Figure 1 Architectures for co
31、nnecting application decoders to a DAB receiverEN 62105:2002 4 BSI 4 October 2002 1.3 Considerations on the data rates of suitable physical interfaces The following table gives an indication on how many RDI frames are required per time to transport the relevant data: The right time scale for this ap
32、proach is physical CIFs which are 22.429 ms (2153 RDI frames). 2 RDI frames and frame types The RDI is based on RDI frames of 24 bits each (see Figure 2). Channel Data capacity RDI frames available Remarks DAB main service channel 1.856 MBit/s (22 bit/RDI F) 1) 2153 (2025 usable for data) 2) in 22.4
33、29 ms 1.687 MBit/s (20 bit/RDI F) DAB FIC Mode I, II, IV in 3.738 ms 80.2 kbit/s (22 bit/RDI F) 358 (350 usable for data) 72.9 kbit/s (20 bit/RDI F) Mode III 119 (117 usable) 107.25 kbit/s (22 bit/RDI F) 97.5 kbit/s (20 bit/RDI F) TII pattern 3) 1+N R T 4)RDI F Mode I: 238 Mode II: 61 Mode III: 31 M
34、ode IV: 121 TII carrier samples 64 RDIF each received transmitter Mode I: 238 NCP 16 RDIF each received transmitter Mode II: 61 16 RDIF each received transmitter Mode III: 31 32 RDIF each received transmitter Mode IV: 121 NOTE 1 An RDI frame (RDIF) carries 24 bit, of which 20 or 22 are useful data (
35、see 2.1). NOTE 2 Assuming a protocol overhead of 3 RDI frames per subchannel/FIB. NOTE 3 Assuming evaluation of TII in the receiver (# Main + sub.Id.) NRT = number of received transmitters. NOTE 4 Assuming evaluation of best carrier pairs per transmitter in the receiver, communication of FFT result,
36、 real and imaginary parts 16 bit each. NRT = number of received transmitters (typ. max. 5), NCP = number of carrier pairs (typ. max. 4).Figure 2 Structure of an RDI frame EN 62105:2002 BSI 4 October 2002 5 Each RDI frame consists of a frame type field (bits 20 23) and a data field (bits 0 19). The s
37、tructure of the data field depends on the frame type field and can borrow two bits (b20 and b21) from the frame type field. The following frame types are defined: all modes: b20 b23 0000 : Padding high capacity mode: b20 b23 0001 : Header of MSC/FIC/TII data 0010 : Start and continuation of MSC/FIC/
38、TII data 0100 : End of MSC/FIC/TII data 0101 : RDI synchronization 1101 : Header of extended capacity data XX10 : Extended capacity data field: The XXs in the extended capacity data frame type serves as an extension of the data field, and in this way increases the width from 20 bits to 22 bits, whic
39、h is enough for all presently discussed data rates. low capacity mode: b20 b23 0010 : Continuation of TII data 0100 : End of TII data 0111 : Start of TII data 1111 : Window signals & data The other codes are reserved. The following table summarizes all above mentioned frame types. 3 Embedding of RDI
40、 into the IEC 958 interface 3.1 RDI frames and IEC 958 subframes RDI frames, (see clause 2), can be carried in the IEC 958 interface 2 according to Figure 3. Figure 3 Embedding RDI frames into IEC 958 subframes EN 62105:2002 6 BSI 4 October 2002 If the RDI is embedded into the IEC 958 structure, the
41、 validity bit (V) shall be set to high in order to protect audio devices from converting RDI data to audio if erroneously connected to an RDI. For the channel status data, the consumer format shall be used. Byte 0 bit 1 of the Channel Status data shall be set to “non-audio”. “Copyright” shall be ass
42、erted (byte 0/bit 2 = 0). Byte 0/bits 3-4-5 shall be set to “000”. The bits 6 & 7 of byte 0 shall be set to Mode 0 (= 00). The category code 001 for broadcast reception of digital audio shall be used (byte 1/bit 0-1-2 = 001). The generation status bit shall be set to “original” (byte 1/bit 7 = 0). I
43、n byte 2 the source number and channel number shall be “unspecified” (byte 2 = 00000000). The sampling frequency shall be 48 kHz (byte 3/bit 0-1-2-3 = 0100). The clock accuracy of 1 000 ppm shall be “Level II” (byte 3/bit 4-5 = 00). The following table shows how the first four bytes of the channel s
44、tatus shall be set: NOTE 1 RDI synchronization (see 4.2) is not related to the IEC 958 block structure. NOTE 2 If the low capacity format (see clause 5) is used on an IEC 958 interface, the frames of Type 1111 shall be carried in the “Channel A” subframes and TII, if any, shall be carried in the “Ch
45、annel B” subframes. 3.2 Proposed amendments to IEC 958 The proposed amendments refer to the coding of the channel status bits, as follows: An entry “DAB” should be defined in the category “broadcast reception” (byte 1/bits 3-4-5-6, proposal: 0010). b20.23 Frame type High capacity mode Low capacity m
46、ode Extended frame Normal frame 0000: Padding + + + 0001: Header of MSC/FIC/TII data + 0010: All modes: data + + + 0011: Reserved 0100: End of data + + + 0101: RDI synchronization + + 0110: Extended capacity data + 0111: Start of TII data + 1000: Reserved 1001: Reserved 1010: Extended capacity data
47、+ 1011: Reserved 1100: Reserved 1101: Header of extended capacity data + 1110: Extended capacity data + 1111: Window signals and data + Byte # b0 . b7 0 01000000 1 *) 00100100 2 00000000 3 01000000 *) see 3.2EN 62105:2002 BSI 4 October 2002 7 3.3 Programme associated data The IEC 958 user bit channe
48、l may be applied to carry programme associated data of the selected audio service component. NOTE Details are under discussion. The following protocol elements will be defined: bit stream synchronization order of bits and bytes header bytes containing length 4 Specification of the high capacity mode
49、 4.1 Indication of channel/TII If the frame type is 0001, b18 and b19 shall indicate the channel or TII, as follows: b18 b19 00 : MSC 01 : FIC 10 : TII 11 : Reserved 4.2 Synchronization to logical frames and FIC reliability The synchronization frame (frame type = 0101) indicates the start of data of a new DAB logical frame and may contain reliability information on the FIC of the previous transmission frame. Figure 4 shows the structure of the sy
