1、 STD.BS1 BS EN 61595-3-ENGL 2000 .I Lb24bb9 ObL703 7T5 m BRITISH STANDARD Multichannel digital audio tape recorder (DATR), reel-to-reel system, for professional use - Part 3: 24-bit operation for 16-bit media The European Standard EN 6159531999 has the status of a British Standard ICs 33.1.30 NO COP
2、YING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 61595-3:2000 IEC 61595-3: 1999 BS EN 61595-3:2000 been prepared under the direction of the Eiectroteciuucal Amd. No. Date Sector Committee, was published under the authority of the standards Committee and comes into effect on 15
3、August 2000 _ O BSI 08-2000 ISBN O 680 36183 7 National foreword Comments This British Standard is the officiai Enghsh language version of EN 615953.1999. It is identical with IEC 615953: 1999. The UK participation in its preparation was entrusted by Technical Committee EPUl, Audio, video and multim
4、edia systems and equipment, to Subcommittee EPL/l/2, Recording, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible internationaVEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; - mo
5、nitor related international and European developments and promulgate them in the UK A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, ail IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 ha
6、s been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative
7、references to inlemational publications with their corresponding European publications. The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspond
8、ence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include ali the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of
9、itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN titie page, pages 2 to 6, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. STD-B
10、SI BS EN h1595-3-ENGL 2000 E 3b24bb9 0863705 578 m EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61595-3 November 1999 ICs 33.160.30 English version Multichannel digital audio tape recorder (DATR), reel-to-reel system, for professional use Part 3: 24-bit operation for 16-bit media (IEC 61 595
11、-3:1999) Systme denregistrement bande audionumrique multivoies (DATR), usage professionnel pour mdia 16 bits Digitales Mehrkanai-Tonbandgert Spulensystem fr Studioanwendungen Teil 3: 24-Bit-Betrieb fr 16-Bit-Medien Partie 3: Fonctionnement 24 bits (IEC 61 595-311 999) (CE1 61 595-31999) This Europea
12、n Standard was approved by CENELEC on 1999-1 0-01. CENELEC members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
13、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 translation under the responsibility of a CENELEC member
14、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. Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, N
15、orway, 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: rue de Stassart 35, B - 1050 Brussels 1999 CENELEC - A
16、li rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61 595-3:1999 E Page 2 EN 61595-31999 Foreword The text of document lOOB/225/FDIS, future edition 1 of IEC 61 595-3, prepared by SC 1 OOB, Audio, video and multimedia information storage system
17、s, of IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61 595-3 on 1999-1 0-01. The following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of an id
18、entical national standard or by endorsement (dop) 2000-07-0 1 - latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2002-1 0-0 1 Endorsement notice The text of the International Standard IEC 61 595-3:1999 was approved by CENELEC as a European Standard witho
19、ut any modification. In the official version, for annex A, Bibliography, the following notes have to be added for the standards indicated: IEC 61 120-1 NOTE: Harmonized as EN 61 120-1 :1993 (not modified). IEC 61 120-2 NOTE: Harmonized as EN 61 120-2:1993 (not modified). IEC 61 120-3 NOTE: Harmonize
20、d as EN 61 120-3:1993 (not modified). IEC 60958 NOTE: Harmonized as EN 60958:1990 (not rnodifiedl. STD.BSI BS EN b1595-3-ENGL 2000 Lb24669 0861707 340 Page 3 EN 61595-3:1999 CONTENTS Page Clause 1 Scope 4 2 Description of data recording . 4 3 Definition of “A” and “B” tracks . 4 Annex A (informative
21、) Bibliography 6 O BSI 08-2000 Page 4 EN 61595-3:1999 Multichannel digital audio tape recorder (DATR), reel-to-reel system, for professional use - Part 3: 24-bit operation for 16-bit media I Scope This International Standard is applicable to the use of a 16-bit track pair to record 24-bit data words
22、 per channel. A requirement for media storing digital audio data with words wider than 16 bits has arisen in the market, influenced by the availability of A/D converters with resolutions higher than 16 bits, and the introduction of digital mixing consoles incorporating signal processing with higher
23、resolution than 16 bits. Digital multitrack tapes, with their enormous data storage capacity, are an ideal medium for such an implementation. The method described herein is also applicable to any other medium with minimum of two tracks 2 Description of data recording Each 24 bit data word is divided
24、 between two paired tracks “A” and “B”, the bit assignments being as shown in Figure 1. MSB LSB 23 15 7 O Bit 15 Track “A O 15 Track “B” O BC 927B9 Figure 1 - Distribution of 24 bits on a 16-bit track pair 3 Definition of “Ay and “8” tracks A given format records N parallel tracks on tape, and N is
25、usually the same as the number of audio (input) channels. Recording 24-bit data halves the number of data channel to N/2, because for 24 bits each channel occupies two tracks. Physical tracks numbered 1 to N/2 shall be used as “A” tracks Physical tracks numbered (N/2 + 1) to N shall be used as “B” t
26、racks. O BSI 08-2000 Page 6 EN 61595-3:1999 Example: For audio channel 2, the 16 most significant bits will be recorded on “A“ track number 2 and the remaining 8 bits will be recorded on track number (N/2 + 2). The most significant 8 bits of the 16-bit words on “B“ tracks shall be filled with zeros
27、as shown in Figure 1. Track “BI shall always contain the least significant 8 bits of the 24-bit word. They shall be positioned in the least significant 8 bits (bits O - 7) of the 16-bit word in track “B“. The most significant 8 bits (bits 15 - 8) of the 16-bit word of track “B“ shall be filled with
28、“O“ (see Figure 1). If pre-emphasis is used for the 24-bit word, this shall be indicated in the SyncKontrol Word of track “A“. Sampling rate and other status indication(s) shall be indicated in the Sync/Control Word of track “A“. A 24-bit recorded tape as described above remains fully compatible wit
29、h existing standard tapes. Unmodified machines reproduce the “A“ tracks with standard 16-bit resolution. The least significant bits recorded on the “B“ tracks will play back resulting in signal data with a level of approximately -50 dB. The d.c. signal content is negligible. O BSI 08-2000 STD-BSI BS
30、 EN bL595-3-ENGL 2000 I Lb24bbS OBbL7LO 935 = Page 6 EN 61595-3:1999 Annex A (informative) Bibliography IEC 61120-1:1991, Digital audio tape recorder reel to reel system, using 6,3 mm magnetic tape, for professional use - Part I: General requirements IEC 61 120-2:1991, Digital audio tape recorder re
31、ei to reel system, using 6,3 mm magnetic tape, for professional use - Part 2: Format A IEC 61 120-3:1991, Digital audio tape recorder reel to reel system, using 6,3 mm magnetic tape, for professional use - Part 3: Format B IEC 60958:1989, Digital audio interface O BSI 08-2000 BS EN 61595-3:2000 IEC
32、6 1595-3: 1999 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution 3SI is the independent national body responsible for preparing British Standards. It resents the UK view on standards in Europe and at the international level. It is ncorporated by Royal Charter. levisions 3r
33、itish Standards are updated by amendment or revision. Users of British Standards ihould make sure that they possess the latest amendments or editions. t is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity w
34、hile using this 3ritish Standard would inform the Secretary of the technical committee responsible, he identity of which can be found on the inside front cover. Tel: 020 8996 9ooo. Tax: 020 8996 7400. 3SI offers members an individual updating service called PLUS which ensures that subscribers automa
35、tically receive the latest editions of standards. Buying standards 3rders for ail BSI, intemational and foreign standards publications should be iddressed to Customer Services. Tel 020 8996 9001. Fax: 020 8996 7001. h response to orders for international standards, it is BSI policy to supply the BSI
36、 mplementation of those that have been published as British standards, unless thenvise requested. information on standards BSI provides a wide range of information on national, European and intemational standards through its Library and its Technical Help to Exporters Service. Various BSI electronic
37、 infodon services are also available which give details on all its products and services. Contact the Information Centre. Tel 020 8996 71 11. Fax: 020 8996 7048. Subscribing memberc of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of stan
38、dards. For details of these and other benefits contact Membership Administrati on. Tel: 020 8996 7002. Fax: 020 8996 7001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitt
39、ed under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means - electronic, photocopying, recording or otherwise - without prior written permission from BSI. This does not preclude the free use, in the cours
40、e of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royal payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel 020 8996 7070.
