ISO 22234-2005 Cinematography - Relative and absolute sound pressure levels for motion-picture multi-channel sound systems - Measurement methods and levels appl.pdf
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1、 Reference number ISO 22234:2005(E) ISO 2005INTERNATIONAL STANDARD ISO 22234 First edition 2005-11-15 Cinematography Relative and absolute sound pressure levels for motion-picture multi-channel sound systems Measurement methods and levels applicable to analog photographic film audio, digital photogr
2、aphic film audio and D-cinema audio Cinmatographie Niveaux de pression sonore relatifs et absolus pour les systmes de films cinmatographiques sonores multicanaux Mthodes de mesure et niveaux applicables aux films sonores photographiques analogiques, aux films sonores photographiques numriques et lau
3、dio de D-cinma ISO 22234:2005(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 performing the ed
4、iting. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can b
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6、t the address given below. ISO 2005 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 bel
7、ow or ISOs member 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 2005 All rights reservedISO 22234:2005(E) ISO 2005 All rights reserved i
8、ii 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 member body interested in a subject for which
9、a technical committee 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 matt
10、ers 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 adopted by the technical committees are circul
11、ated 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 patent rights. ISO shall not be held responsib
12、le for identifying any or all such patent rights. ISO 22234 was prepared by Technical Committee ISO/TC 36, Cinematography. INTERNATIONAL STANDARD ISO 22234:2005(E) ISO 2005 All rights reserved 1 Cinematography Relative and absolute sound pressure levels for motion-picture multi-channel sound systems
13、 Measurement methods and levels applicable to analog photographic film audio, digital photographic film audio and D-cinema audio 1 Scope This International Standard specifies the measurement methods and wide-band sound pressure levels for motion-picture control rooms, review rooms, and indoor theatr
14、es. Together with ISO 2969, it is intended to assist in standardization of reproduction of motion-picture sound in such rooms. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For u
15、ndated references, the latest edition of the referenced document (including any amendments) applies. ISO 2969:1987, Cinematography B-chain electro-acoustic response of motion-picture control rooms and indoor theatres Specifications and measurements IEC 60268-17:1990, Sound system equipment Part 17:
16、Standard volume indicators IEC 61672-1:2002, Electroacoustics Sound level meters Part 1: Specifications 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 absolute sound pressure spatially averaged sound pressure level of a single channel of a t
17、heatrical sound system measured with broadband pink noise at the reference electrical level as a stimulus NOTE The 0 dB (reference) level for sound pressure is 20 N/m 2 . 3.2 average responding meter meter which provides a voltage indication proportional to the average value of the rectified signal,
18、 with ballistics as described in IEC 60268-17 3.3 bass extension technique of taking low-frequency information from a film sound-track, processing it, and sending it to a sub-woofer, as opposed to an LFE channel NOTE See A.3. ISO 22234:2005(E) 2 ISO 2005 All rights reserved3.4 B-chain final chain th
19、at part of a motion-picture sound reproduction system, as shown in Figure 1 for a typical film system, commencing at the input terminals of the main fader and terminating in the listening area defined in Figure 2 in which sound pressure level measurements are taken NOTE See A.7. 3.5 electroacoustic
20、response B-chain spatially averaged frequency response measured in one-third octave bands as described in ISO 2969 NOTE The electroacoustic response is expressed in decibels. 3.6 LFE channel discrete low-frequency effects channel, normally having an upper bandwidth between 80 Hz and 125 Hz 3.7 pink
21、noise stochastic signal having a continuous spectrum with equal energy per equal logarithmic interval of frequency, and with a Gaussian probability distribution of instantaneous amplitude 3.8 reference electrical level voltage measured by an average responding voltmeter of wide-band pink noise using
22、 a measurement band pass filter of 22 Hz to 22 kHz bandwidth when the test signal is at reference recorded level, and when the fader is at its normal setting NOTE See A.5 and A.7. 3.9 reference recorded level level of pink noise equivalent to 50 % modulation on an analog photographic sound-track, or
23、 the equivalent level on a digital photographic sound-track or a digital cinema (D-cinema) sound-track (typically in each case 20 dB below 100 % modulation) 3.10 relative sound pressure level sound pressure level of one channel when compared with another during reproduction of the wide-band test sig
24、nal of 3.1, as opposed to the sound pressure level in one frequency range when compared with another 3.11 wide-band pink noise pink noise having a bandwidth exceeding the normal acoustic frequency range NOTE A suitable test signal should have a frequency response flat to within 0,5 dB when measured
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