1、 Reference number ISO 26432-2:2008(E) ISO 2008INTERNATIONAL STANDARD ISO 26432-2 First edition 2008-07-15 Digital source processing Part 2: Digital cinema (D-cinema) low frequency effects (LFE) channel audio characteristics Procd de source numrique Partie 2: Caractristiques sonores de chane des effe
2、ts basse frquence du cinma D ISO 26432-2:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer p
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7、 26432-2:2008(E) ISO 2008 All rights reserved iii Foreword ISO (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
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9、l Electrotechnical Commission (IEC) on all matters of electrotechnical 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
10、 adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of
11、 patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 26432-2 was prepared by the Society of Motion Picture and Television Engineers (as SMPTE EG 432-2-2006) and was adopted, under a special “fast-track procedure”, by Technical Committee ISO/TC 36, Cine
12、matography, in parallel with its approval by the ISO member bodies. ISO 26432 consists of the following parts, under the general title Digital source processing: Part 2: Digital cinema (D-cinema) low frequency effects (LFE) channel audio characteristics ISO 26432-2:2008(E) ISO 2008 All rights reserv
13、ed 1Table of Contents Foreword . 1 Introduction . 1 1 Scope 2 2 Parameters 2 Annex A Bibliography 3 Foreword SMPTE (the Society of Motion Picture and Television Engineers) is an internationally-recognized standards developing organization. Headquartered and incorporated in the United States of Ameri
14、ca, 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. Participation in these Committees is open to all with a bona fide interest in their work. S
15、MPTE 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 Practices. SMPTE Engineering Guideline EG 432-2 was prepared by Technology Committee DC28.
16、Introduction For interoperability of digital cinema equipment used to deliver LFE channel audio to the playback equipment in D-Cinema environments, standardized electrical frequency response for the playback LFE channel is needed. The necessary characteristics are turnover frequency, slope and devia
17、tion. Page 1 of 3 pages EG 432-2-2006 SMPTE ENGINEERING GUIDELINE Digital Source Processing D-Cinema Low Frequency Effects (LFE) Channel Audio Characteristics Copyright 2007 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 Approved Dece
18、mber 29, 2006 ISO 26432-2:2008(E) 2 ISO 2008 All rights reservedEG 432-2-2006 Page 2 of 3 pages 1 Scope This guideline addresses interoperability of equipment from the standpoint of the frequency response of filters used in the playback or monitor path in the theater LFE channel for digital cinema.
19、This response curve will create standardization of these filters without specifying their design. 2 Parameters 2.1 Turnover Frequency The turnover frequency is defined as the point at which the response of the filter is at 3 dB from the passband reference. The LFE channel shall have a turnover frequ
20、ency of 125 Hz. 2.2 Filter Slope The filter slope of the LFE Channel shall be as per the Reference Filter Response Table (section 2.4) from the turnover frequency of 125 Hz. 2.3 Deviation Deviation within the passband shall be 1 dB and the deviation of the turnover frequency ( 3 dB point) shall be 5
21、 Hz. 2.4 Reference Filter Frequency Response Table Frequency Hz Attenuation dB 25Hz 0dB 31.5Hz 0dB 40Hz 0dB 50Hz 0dB 63Hz 0dB 80Hz 0dB 100Hz 0dB 125Hz -3dB 160Hz -45dB 200Hz -102dB ISO 26432-2:2008(E) ISO 2008 All rights reserved 3 EG 432-2-2006 Page 3 of 3 pages Annex A (Informative) Bibliography S
22、MPTE 202M-1998, Motion-Pictures Dubbing Theaters, Review Rooms and Indoor Theaters B-Chain Electroacoustic Response SMPTE RP 200-2002, Relative and Absolute Sound Pressure Levels for Motion-Picture Multichannel Sound Systems Applicable for Analog Photographic Film Audio, Digital Photographic Film Audio and D-Cinema ISO 26432-2:2008(E) ICS 37.060.99 Price based on 2 pages ISO 2008 All rights reserved
