1、 Reference number ISO 26428-2:2008(E) ISO 2008INTERNATIONAL STANDARD ISO 26428-2 First edition 2008-07-15 Digital cinema (D-cinema) distribution master Part 2: Audio characteristics Souche de la distribution du cinma numrique (cinma D) Partie 2: Caractristiques dcoute ISO 26428-2:2008(E) PDF disclai
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5、ED DOCUMENT ISO 2008 All rights reserved. Unless otherwise specified, 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 either ISO at the address below or ISOs memb
6、er body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedISO 26428-2:2008(E) ISO 2008 All rights reserved iii Foreword I
7、SO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical c
8、ommittee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electr
9、otechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the m
10、ember bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. ISO 26428-2 was prepared by the Society of Motion Picture and Television Engineers (as SMPTE 428-2-2006) and was adopted, under a special “fast-track procedure”,
11、by Technical Committee ISO/TC 36, Cinematography, in parallel with its approval by the ISO member bodies. ISO 26428 consists of the following parts, under the general title Digital cinema (D-cinema) distribution master: Part 1: Image characteristics Part 2: Audio characteristics Part 3: Audio channe
12、l mapping and channel labeling ISO 26428-2:2008(E) ISO 2008 All rights reserved 1Table of contents Foreword Introduction 1 Scope 2 Normative references 3 Parameter values Annex A Bibliography Foreword SMPTE (the Society of Motion Picture and Television Engineers) is an internationally-recognized sta
13、ndards developing organization. Headquartered and incorporated in the United States of America, SMPTE has members in over 80 countries on six continents. SMPTEs Engineering Documents, including Standards, Recommended Practices and Engineering Guidelines, are prepared by SMPTEs Technology Committees.
14、 Participation in these Committees is open to all with a bona fide interest in their work. SMPTE cooperates closely with other standards-developing organizations, including ISO, IEC and ITU. SMPTE Engineering Documents are drafted in accordance with the rules given in Part XIII of its Administrative
15、 Practices. SMPTE Standard SMPTE 428-2 was prepared by Technology Committee DC28. Introduction This standard addresses interoperability of equipment used to deliver audio in digital cinema theaters by defining the sample rate, bit depth, channel count and reference level of the digital audio. Page 1
16、 of 3 pages SMPTE 428-2-2006 SMPTE STANDARD D-Cinema Distribution Master Audio Characteristics Copyright 2006 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 Approved August 16, 2006 ISO 26428-2:2008(E) 2 ISO 2008 All rights reservedSM
17、PTE 428-2-2006 Page 2 of 3 pages 1 Scope For interoperability of digital cinema equipment used to create an Audio D-Cinema Distribution Master. The necessary characteristics of digital audio to be specified are bit depth, sample rate, minimum channel count, and reference levels. 2 Normative referenc
18、es The following standard contains provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investig
19、ate the possibility of applying the most recent edition of the standard indicated below. AES3-2003, AES Recommended Practice for Digital Audio Engineering Serial Transmission Format for Two-Channel Linearly Represented Digital Audio Data 3 Parameter values 3.1 Bit depth The bit depth shall be a maxi
20、mum of 24 bits per sample. Material having other bit depths shall be justified to the most significant bit (AES3, clause 4.1.1). The audio sample word shall be linear 2s complement representation as defined in AES3, clause 4.1.1. 3.2 Sample rate Irrespective of the associated image frame rate or rat
21、es, the delivered audio sample rate contained within the D-Cinema Distribution Master (DCDM) shall be either forty-eight thousand samples per second per channel, commonly expressed as 48.000 kHz, or ninety-six thousand samples per second per channel, commonly expressed as 96.000 kHz. Audio sample ra
22、te jitter shall be as specified in AES3. NOTE The called out sample rates are an average over time. Instantaneous deviation of the sample rates from their average (jitter) affects the quality of the audio output in digital-to-analog conversions and so must be considered in implementation designs. 3.
23、3 Channel count The digital cinema distribution master (DCDM) shall support a channel count of sixteen full-bandwidth channels. Not all sixteen channels need be used on any given title. 3.4 Reference level, Digital Digital inputs and outputs shall have a reference level of 20 dB FS. ISO 26428-2:2008
24、(E) ISO 2008 All rights reserved 3SMPTE 428-2-2006 Page 3 of 3 pages Annex A (informative) Bibliography AES5-2003, AES Recommended Practice for Professional Digital Audio Preferred Sampling Frequencies for Applications Employing Pulse-Code Modulation AES11-2003, AES Recommended Practice for Digital Audio Engineering Synchronization of Digital Audio Equipment in Studio Operations AES-R2-2004, AES Project Report for Articles on Professional Audio and for Equipment Specifications ISO 26428-2:2008(E) ICS 35.040; 37.060.99 Price based on 2 pages ISO 2008 All rights reserved
