1、 Recommendation ITU-R BS.1894(05/2011)Digital radio broadcast service,captioned radioBS SeriesBroadcasting service (sound)ii Rec. ITU-R BS.1894 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency spectrum by all
2、 radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are performed by World and Regional Radiocommunication Conference
3、s and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statements and li
4、censing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found. Series of ITU-R Recommendations (Also available onl
5、ine at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed service M Mobile, radiodetermination, amateur and related satellite services
6、 P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spectrum management SNG Satellite news gathering TF Time signals and freque
7、ncy standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2011 ITU 2011 All rights reserved. No part of this publication may be reproduced, by any means whatsoev
8、er, without written permission of ITU. Rec. ITU-R BS.1894 1 RECOMMENDATION ITU-R BS.1894 Digital radio broadcast service, captioned radio (2011) Scope This Recommendation describes mechanisms to support captioned radio broadcast services on the basis of terrestrial digital sound broadcasting systems
9、 described in Recommendation ITU-R BS.1114 as well as traditional analogue frequency modulation (FM) system(s). The ITU Radiocommunication Assembly, considering a) that there are an estimated 650 million people worldwide with sensory disabilities; b) that the goal of the United Nations Convention on
10、 Rights of People with Disabilities (CRPD) Article 9 is to: Promote the design, development, production and distribution of accessible information and communications technologies and systems at an early stage, so that these technologies and systems become accessible at minimum cost; c) that the ITU
11、Radiocommunication Sector has recognized the fundamental importance of Bridging the disabilities Digital Divide as a threshold initiative to improve access for all; d) that digital radio systems of multiple types are now operational on a variety of continents; e) that each digital radio system in op
12、eration supports multiple flexible service modes that in theory are capable of supporting transmission of live captioning; f) that to implement those digital radio service modes will enable hundreds of millions of deaf and hard of hearing individuals worldwide to have access to the live radio medium
13、; g) that Recommendation ITU-R BS.1114 describes digital sound broadcasting (DSB) System A, also known as the Eureka 147 digital audio broadcasting (DAB) System; Digital System F, also known as the ISDB-TSBSystem; and Digital System C, also known as the IBOC DSB System; h) that traditional analogue
14、frequency modulation (FM) transmissions are capable of transmitting captioning as described in Recommendation ITU-R BS.643, known as the radio-data system (RDS), and described in Recommendation ITU-R BS.1194 System A, known as the data radio channel (DARC) System; j) that consumer radio receivers ar
15、e widely available today that have been shown to be configurable to display captioning, recommends 1 that, in the case of programmes intended for radio broadcast using the ITU DSB systems described in Recommendation ITU-R BS.1114, appropriate modes should be identified in all systems to support capt
16、ioned radio with a minimum 500 bit/s capacity, as described in Annex 1; 2 that, in the case of programmes intended for radio broadcast using traditional analogue FM methods, account should be taken in the guidelines for captioning described in Annex 2, 2 Rec. ITU-R BS.1894 further recommends 1 that
17、manufacturers of consumer radio receivers employing any or all of the ITU DSB System A, ITU DSB System F, ITU DSB System C and/or traditional analogue FM be strongly encouraged to produce receivers that display captioning in a way consistent with ITU-R Recommendations; 2 that broadcasters be strongl
18、y encouraged to transmit programmes with captioning as an integral part of their broadcast. Annex 1 Mechanism for supporting captioning using ITU DSB systems Abbreviations AAS-CC Advanced application services Closed caption DAB Digital audio broadcasting DRM Digital Radio Mondiale DSB Digital sound
19、broadcasting IBOC In-band on-channel MSC Main service channel PES Packetized elementary stream SB Integrated services digital broadcasting terrestrial sound broadcasting Table 1 lists the mechanisms and properties of ITU DSB systems with respect to their capability of transmitting captioning at a mi
20、nimum 500 bit/s. TABLE 1 Digital radio system 500 bit/s capacity Mechanism for supporting captioning Reference Recommendation ITU-R BS.1114 System A (DAB) Yes MPEG Audio Layer II Ancillary Data ISO/IEC 11172-3 and ISO/IEC 13818-3 Recommendation ITU-R BS.1114 System C (IBOC) Yes AAS CC Service Token
21、NRSC-5B Recommendation ITU-R BS.1114 System F (ISDB-TSB) Yes PES packets containing private data ITU-T H.222.0 and ARIB STD-B24 Vol. 1 Part 3 Rec. ITU-R BS.1894 3 References (Informative) ARIB STD-B24 Vol. 1 Part 3: Data coding and transmission specification for digital broadcasting, Volume 1, Part
22、3 Coding of caption and superimpose. ISO/IEC 11172-3: Information technology Coding of moving pictures and associated audio for digital storage media at up to about 1.5 Mbit/s Part 3: Audio. ISO/IEC 13818-3: Information technology Generic coding of moving pictures and associated audio information Pa
23、rt 3: Audio. ITU-T H.222.0: Information technology Generic coding of moving pictures and associated audio information: Systems. NRSC-5B: In-band/on-channel Digital Radio Broadcasting Standard, National Radio Systems Committee (www.nrscstandards.org), April, 2008. Annex 2 Mechanism for supporting cap
24、tioning using traditional analogue FM Abbreviations DARC Data radio channel ODA Open data applications RDS Radio data system Table 2 shows the mechanism and properties of traditional analogue FM systems with regard to their capability of transmitting captioning at a minimum 500 bit/s rate. TABLE 2 D
25、ata channel system 500 bit/s capacity Mechanism for supporting captioning Reference Recommendation ITU-R BS.643 (RDS) Yes ODA IEC 62106 ed2.0 Recommendation ITU-R BS.1194 System A (DARC) Yes Mode 1 transmission data or Short Message Channel ETSI EN 300 751 4 Rec. ITU-R BS.1894 References (Informative) IEC 62106 ed2.0: Specification of the Radio Data System (RDS) for VHF/FM sound broadcasting in the frequency range from 87.5 MHz to 108.0 MHz. ETSI EN 300 751: Radio broadcasting systems; Data Radio Channel (DARC); System for wireless infotainment forwarding and teledistribution.
