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1、BRITISH STANDARD BS ISO 20859:2005 Cinematography Spectral response of photographic audio reproducers for analog dye sound tracks on 35 mm film ICS 37.060.20 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:23:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 20859:2005 This British St
2、andard was published under the authority of the Standards Policy and Strategy Committee on 3 October 2005 BSI 3 October 2005 ISBN 0 580 46649 3 National foreword This British Standard reproduces verbatim ISO 20859:2005 and implements it as the UK national standard. The UK participation in its prepar
3、ation was entrusted to Technical Committee CPW/36, Cinematography, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this
4、 document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a cont
5、ract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals f
6、or change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1 and 2, an inside back cover and
7、 a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:23:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 20
8、859:2005(E) INTERNATIONAL STANDARD ISO 20859 First edition 2005-06-15 Cinematography Spectral response of photographic audio reproducers for analog dye sound tracks on 35 mm film Cinmatographie Rponse spectrale de lecteurs audio avec des pistes sonores analogiques de couleurs sur film de tirage 35 m
9、m BS ISO 20859:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:23:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:23:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 20859:2005 iii Foreword ISO (the International Organizat
10、ion 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 committee has been established h
11、as 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 electrotechnical standardization. Int
12、ernational 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 member bodies for voting. Public
13、ation 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 responsible for identifying any or all such patent ri
14、ghts. ISO 20859 was prepared by Technical Committee ISO/TC 36, Cinematography. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:23:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:23:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1
15、 Cinematography Spectral response of photographic audio reproducers for analog dye sound tracks on 35 mm film 1 Scope This International Standard specifies the spectral response of the photographic audio reproducer light source and receptor as a unit, including any optical filtering that can be inte
16、rposed. The analog sound track formats suitable for reproduction using such a reproducer include the cyan dye-only track (without redevelopment of silver) and both conventional and “high magenta” soundtracks (with redevelopment of silver). 2 Spectral response 2.1 The peak or maximum response of the
17、combined audio reproducer light source, filter and receptor shall be 660 nm 20 30 + nm. 2.2 The integrated response of the unit to all wavelengths greater than 800 nm shall be less than 5 % of the total integrated response measured from 400 nm to 800 nm. BS ISO 20859:2005 Licensed Copy: sheffieldun
18、sheffieldun, na, Sun Nov 26 13:23:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 20859:2005 2 Annex A (informative) Additional data The reproduction of analog photographic sound tracks has long employed a tungsten light source and an infrared-sensitive photocell. The light beam is modulated by
19、 changes in the infrared energy absorption of the silver sound track image. This practice dates from black and white practice. When colour release prints were introduced, the practice of redeveloping a silver sound track, which consists of silver, magenta dye and cyan dye, was employed in order to m
20、aintain compatibility with all existing infrared-sensitive reproducers fitted to projectors. A change to dye-only sound tracks is taking place in order to provide environmental and other benefits. The elimination of the need for silver sound track redevelopment will allow a simplification of the col
21、our positive process with savings in the use of hazardous chemicals and water. Discontinuation of silver redevelopment in release prints will eliminate the discharge of silver into the environment because, when used, release prints are ultimately destroyed. The red-sensitive sound reproducers requir
22、ed for dye tracks employ solid-state light emitting diodes (LED) or lasers with a longer lifetime than tungsten lamps, providing increased reliability of sound reproduction in theatres. The conversion of sound reproducers from infrared-sensitive devices (for silver sound tracks) to red-sensitive dev
23、ices (for cyan dye sound tracks) requires an intermediate sound track format called “high magenta”. The “high magenta” sound track eliminates the cyan dye from the silver sound track, thus making the transmission level from 600 nm to 1 000 nm almost equal. This almost equal transmission range produc
24、es good sound quality, including cancellation of cross-modulation distortion, for infrared-sensitive readers and all types of red-sensitive readers. A dye-only soundtrack needs to use the dye density to modulate the scanning beam. Unlike the silver density that exists at all wavelengths, the cyan dy
25、e in film does not have sufficient density to modulate the scanning beam at wavelengths of less than 600 nm and at wavelengths of greater than 750 nm. Reading the cyan dye-only soundtrack too far away from its wavelength of maximum absorption will cause degradation of sound quality (higher cross-mod
26、ulation distortion, lower high-frequency response and lower signal-to-noise ratio). The purpose of limiting the spectral response of the audio reproducer is to use advantageously the absorption of the cyan dye image to modulate the scanning beam and to maintain the maximum sound quality of which the
27、 cyan dye record is capable. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:23:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 13:23:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 20859:2005 BSI 389 Chiswick High Road London
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