1、BRITISH STANDARD BS ISO 1189:1986 Implementation of ISO 1189:1986 Cinematography Recorded characteristic for magnetic sound records on 35 mm motion-picture film excluding striped release prints Specifications UDC 771.531.351:778.534.455BSISO1189:1986 This British Standard, having been prepared under
2、 the directionof the Consumer Products and Services Sector Board, was published under theauthority of the StandardsBoard and comes into effect on 15January1996 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference CPW/36 Draft announced in BSI News August
3、1995 ISBN 0 580 25127 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee CPW/36, Cinematography International coordination, upon which the following bodies were represented: British Kinematograph, Sound and Television Soci
4、ety British Photographic Association ITV Association (ITVA) The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Association of Independent Cinemas British Broadcasting Corporation British Film and Television Producers Association British Film
5、 Institute Broadcasting Entertainment Cinematograph and Theatre Union Cinema Exhibitors Association Institute of Amateur Cinematographers Royal Photographic Society Amendments issued since publication Amd. No. Date CommentsBSISO1189:1986 BSI 11-1999 i Contents Page Committees responsible Inside fron
6、t cover National foreword ii Foreword iii Text of ISO 1189 1BSISO1189:1986 ii BSI 11-1999 National foreword This British Standard reproduces verbatim ISO1189:1986 and implements it as the UK national standard. It supersedes BS5550-3.4.2:1978 which is withdrawn. This British Standard is published und
7、er the direction of the Consumer Products and Services Sector Board whose Technical Committee CPW/36 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests inf
8、ormed; monitor related international and European developments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick High Road, London W4 4AL. A British Standard does not purport to include all
9、the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and i
10、i, theISO title page, pages ii to iv, pages 1 and 2 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.ISO1189:1986 (E) ii BSI 11-1999 Contents Page Foreword iii 1 Sco
11、pe and field of application 1 2 Recorded characteristic 1 3 Tolerances 2 Figure Tolerance on recorded levels 2 Table 1ISO1189:1986 (E) BSI 11-1999 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The wor
12、k 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 has the right to be represented on that committee. International organizations, governmental and non-governme
13、ntal, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. They are approved in accordance with ISO procedures requiri
14、ng at least75% approval by the member bodies voting. International Standard ISO1189 was prepared by Technical Committee ISO/TC36, Cinematography. This second edition cancels and replaces the first edition (ISO1189:1975), of which it constitutes a technical revision. Users should note that all Intern
15、ational Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated.iv blankISO1189:1986(E) BSI 11-1999 1 1 Scope and field of application This International Standard specifies the recorded ch
16、aracteristic for magnetic sound records on35mm motion-picture film excluding striped release prints when used at the nominal speed of24 frames(45,6cm or18 in) per second or25 frames(47,5cm or18.7 in) per second. NOTEThis International Standard and relevant portions of Recommendation No.265-2 of the
17、CCIR have substantially the same technical content. 2 Recorded characteristic 2.1 With constant sine-wave signal applied to the input of the recording system, the nominal characteristic of the short circuit magnetic flux versus frequency shall fall with increasing frequency in conformity with the im
18、pedance of a parallel combination of a capacitance and resistance having a time constant t =354s. The curve defined above is represented by L (in decibels) = L 0 10lg (1+4 2f 2t 2 ) where The approximate numerical values are given in the Table. 2.2 The corresponding reproducing characteristic is tha
19、t which gives a flat response when reproducing a sound track recorded with the relative short circuit flux levels stated in2.1. Table f is the frequency, in hertz; t is the time constant, in seconds; L 0 is a constant calculated to make L = 0 at the reference frequency of1kHz (L 0= 0,205). Frequency
20、 L Hz dB 40 50 + 0,20 + 0,20 63 80 + 0,20 + 0,20 100 125 + 0,20 + 0,20 160 200 + 0,20 + 0,20 250 315 + 0,19 + 0,18 400 500 + 0,17 + 0,15 630 800 + 0,12 + 0,07 1 000 1 250 0,00 0,11 1 600 2 000 0,30 0,56 2 500 3 150 0,94 1,50 4 000 5 000 2,28 3,24 6 300 8 000 4,45 5,92 10 000 12 500 7,46 9,12 14 000
21、16 000 10,00 11,06ISO1189:1986 (E) 2 BSI 11-1999 3 Tolerances Magnetic sound records on35mm films shall be recorded to the characteristic specified in2.1 within the tolerances given in the Figure. Figure Tolerance on recorded levelsblankBS ISO 1189:1986 BSI 389 Chiswick High Road London W4 4AL BSIBr
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