1、STD-ITU-T RECNN J-52 AND 1-ENGL 1999 48b259L INTERNATIONAL TELECOMMU N KATION UN ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Ob70083 7Lb ON J.52 Amendment I (09199) SERIES J: TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Dig i tal trans m ission of sou nd- p rog
2、ram me signals Digital transmission of high-quality sound-programme signals using one, two or three 64 kbitls channels per mono signal (and up to six per stereo signal) Amendment I : New Appendix II - Extracts from EBU specification of an ISDN Codec capable of del ive ri ng h i g h -q u a I i ty a u
3、 d i o ITU-T Recommendation J.52 - Amendment 1 (Previously CCITT Recommendation) STDsITU-T RECMN Je52 AID 1-ENGL 1999 48b259L Ob70084 652 ITU-T J-SERIES RECOMMENDATIONS TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS General Recommendations J.1-J.9 General specifications for
4、 analogue sound-programme transmission Performance characteristics of analogue sound-programme circuits Equipment and lines used for analogue sound-programme circuits Digital encoders for analogue sound-programme signals Digital transmission of sound-programme signals Circuits for analogue televisio
5、n transmission Analogue television transmission over metallic lines and interconnection with radio-relay links Digital transmission of television signals Ancillary digital services for television transmission J. 10-J. 19 5.20-5.29 J.30-J.39 J.40-J.49 5.50-5.59 J.60-J.69 5.70-5.79 J .80-J.89 J.90-J.9
6、9 Operational requirements and methods for television transmission J. 100-J. 109 Interactive systems for digital television distribution Transport of MPEG-2 signals on packetised networks Measurement of the quality of service Digital television distribution through local subscriber networks 5.110-5.
7、129 J. 130-5.139 5.140-5.149 5.150-5.159 For further details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION 5.52 DIGITAL TRANSMISSION OF HIGH-QUALITY SOUND-PROGRAMME SIGNALS USING ONE, TWO OR THREE64 kbit/s CHANNELS PER MONO SIGNAL (AND UP TO SIX PER STEREO SIGNAL) AMENDMENT 1
8、New Appendix II - Extracts from EBU specification of an ISDN Codec capable of delivering high-quality audio Source Amendment 1 to ITU-T Recommendation 5.52 was prepared by ITU-T Study Group 9 (1997-2000) and was approved under the WTSC ResolutionNo. 1 procedure on 17 September 1999. Recommendation J
9、.52/Amd.l (09/99) 1 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni- cations. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating
10、 and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn
11、, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative bas
12、is with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation
13、 of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As
14、of the date of approval of this Recommendation, the ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly ur
15、ged to consult the TSB patent database. O ITU 2000 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 11 Recommendation J.52/Amd.l (09/
16、99) STD-ITU-T RECMN J.52 AMD 3-ENGL 1999 a 48b259L Ob70087 363 CONTENTS Appendix II - Extracts from EBU specification of an ISDN Codec capable of delivering high-quality audio . . . . . . . Recommendation J.52/Amd.l (09/99) Page 1 . 111 Recommendation 5.52 DIGITAL TRANSMISSION OF HIGH-QUALITY SOUND-
17、PROGRAMME SIGNALS USING ONE, TWO OR THREE64 kbit/s CHANNELS PER MONO SIGNAL (AND UP TO SIX PER STEREO SIGNAL) AMENDMENT 1 New Appendix II - Extracts from EBU specification of an ISDN Codec capable of delivering high-quality audio (Geneva, 1999) Insert the following Appendix II at the end of the Reco
18、mmendation: Appendix II Extracts from EBU specification of an ISDN Codec capable of delivering high-quality audio The members of the EBU have recognized the need to use ISDN equipment implementing ITU-T Recommendation J.52 for the transmission of audio signals. It was necessary to vens, the interwor
19、king of equipment from different suppliers in order to allow international transmission. A series of tests was organized during 199711998 and it has shown an interworking capability between four codecs from different suppliers, but not at the bit rate required for contribution-quality transmission.
20、The following items are extracted from the specification defining the broadcasters user requirements for an ISDN audio codec which allows for a range of transmission quality up to contribution quality: The unit shall be able to work on up to 6 Bearer channels. The unit shall comply with ITU-T Recomm
21、endation 5.52 including error correction procedure. It is not required to support Ancillary Data at more than 0.5% of the available bandwidth of a given call. The end-to-end coding delay shall not exceed 200 ms when measured via an ISDN simulator or an exchange, in the case of 48 kHz sampling rate.
22、Audio input and output shall be by both analogue and by digital interfaces. The ability to work at 24 kHz sampling when using just one Bearer channel is an advantage. In addition, the ability to work in an asymmetrical configuration using different coding in each direction (MPEG/G.722) in order to o
23、ptimize the quality and the delay is an advantage. Recommendation J.52/Amd.l (09/99) 1 Series A Series B Series C Series D Series E Series F Series G Series H Series I Series J Series K Series L Series M Series N Series O Series P Series Q Series R Series S Series T Series U Series V Series X Series
24、 Y Series Z ITU-T RECOMMENDATIONS SERIES Organization of the work of the ITU-T Means of expression: definitions, symbols, classification General telecommunication statistics General tariff principles Overall network operation, telephone service, service operation and human factors Non-telephone tele
25、communication services Transmission systems and media, digital systems and networks Audiovisual and multimedia systems Integrated services digital network Transmission of television, sound programme and other multimedia signals Protection against interference Construction, installation and protectio
26、n of cables and other elements of outside plant TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintenance: international sound programme and television transmission circuits Specifications of measuring equipment Telepho
27、ne transmission quality, telephone installations, local line networks Switching and signalling Telegraph transmission Telegraph services terminal equipment Terminals for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communications Global information infrastructure Languages and general software aspects for telecommunication systems IIllllllllllllllIllllllllllllllllll *17959* Printed in Switzerland Geneva, 2000
