ITU-R BS 1548-4-2013 User requirements for audio coding systems for digital broadcasting《数字广播音频编码系统的用户要求》.pdf
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1、 Recommendation ITU-R BS.1548-4(01/2013)User requirements for audio coding systems for digital broadcastingBS SeriesBroadcasting service (sound)ii Rec. ITU-R BS.1548-4 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-f
2、requency spectrum by all 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 Radio
3、communication Conferences 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
4、patent statements and licensing 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 Recommendat
5、ions (Also available online 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 re
6、lated satellite services 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
7、 Time signals and frequency 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, 2013 ITU 2013 All rights reserved. No part of this publication may be reproduce
8、d, by any means whatsoever, without written permission of ITU. Rec. ITU-R BS.1548-4 1 RECOMMENDATION ITU-R BS.1548-4*User requirements for audio coding systems for digital broadcasting (Question ITU-R 19-1/6) (2001-2002-2006-2012-2013) Scope This Recommendation specifies the requirements relevant to
9、 the use of audio source coding systems in sound broadcasting, including television. The Recommendation covers the application of contribution and distribution, and emission. The ITU Radiocommunication Assembly, considering a) that the multichannel sound system, with or without accompanying picture,
10、 is the subject of Recommendation ITU-R BS.775; b) that audio coding for digital broadcasting is the subject of Recommendation ITU-R BS.1196; c) that the coding systems recommended in Recommendation ITU-R BS.1196 offer monophonic, two-channel stereophonic and multichannel coding modes; d) that the b
11、asic audio and stereo image quality required for sound systems for television and sound broadcasting is to be the highest possible, generally indistinguishable from the source material; e) that required audio quality for some emission applications is to be equivalent to or better than good reception
12、 of FM or AM analogue broadcasting services; f) that Recommendation ITU-R BS.1283 provides a guide to ITU-R Recommendations for subjective assessment of sound quality; g) that interoperability and network operation involving programme connections such as contribution and distribution links should be
13、 carefully considered; h) that interoperability with existing consumer multichannel audio equipment, such as matrix surround decoders and discrete multichannel decoders, should be carefully considered; j) that, when introducing a multichannel sound system in an existing broadcasting service, compati
14、bility with existing receivers to maintain the service must be considered; k) that more generally, in view of the many applications of such systems, all technical, quality and operational requirements should be clearly specified; l) that the performance of audio coding systems is widely dependent on
15、 the configuration under which the system is operated (bit rate, use of pre-matrixing, use of composite coding, etc.); m) that several broadcast services already use or have specified the use of the systems recommended in Recommendation ITU-R BS.1196; *Radiocommunication Study Group 6 made editorial
16、 amendments to this Recommendation in November 2009 and October 2010 in accordance with Resolution ITU-R 1. 2 Rec. ITU-R BS.1548-4 n) that, consequently, the broadcasters have a need of information necessary to set up all the available coding parameters of the recommended systems; o) that the introd
17、uction of incompatible systems with similar performance characteristics is highly undesirable; p) that those broadcasters which have not yet started services should be able to choose the system which is best suited to their application and which is the most cost-effective, recommends 1 that the audi
18、o coding systems for digital television and sound broadcasting for contribution and distribution applications should fulfil the requirements listed in Annex 1; 2 that the audio coding systems for digital television and sound broadcasting for emission applications should fulfil the requirements liste
19、d in Annex 2; 3 that the categories of audio quality listed in Annex 3 should govern the audio quality and applications in recommends 1 and 2. NOTE 1 Information about systems that have been shown to meet the quality and other requirements for contribution and distribution applications is included i
20、n Appendix 1 to Annex 1. NOTE 2 Information about systems that have been shown to meet the quality and other requirements for emission applications is included in Appendix 1 to Annex 2. Annex 1 Requirements for contribution and distribution The audio coding systems for digital television and sound b
21、roadcasting for both contribution and distribution applications should fulfill the requirements listed below. 1 Service requirements 1.1 Channel configurations For audio services the following channel configurations should be supported according to the needs of applications (see Recommendation ITU-R
22、 BS.775 Multichannel sterophonic sound system with and without accompanying picture): Rec. ITU-R BS.1548-4 3 No. of channels Channel configuration Channel assignment 1 channel 1/0 Mono 2 channels 2/0 Left, right 3 channels 3/0 2/1 Left, right, centre Left, right/surround 4 channels 3/1 2/2 Left, rig
23、ht, centre/surround Left, right/surround left, surround right 5 channels 3/2 Left, right, centre/surround left, surround right together with an optional low frequency effects (LFE) channel. For contribution, in addition, it could be necessary to convey programmes produced in other formats than those
24、 listed above, e.g. 3/4, thus the coding system should allow for accommodation of additional high quality channels. 1.2 Flexible allocation of channels A bit stream should provide identification data for signalling and controlling of sound configurations. It must be possible in the transmission syst
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