1、BRITISH STANDARD BS 5550-2.4.3: 1986 ISO 1188:1984 Cinematography Part 2: 16 mm film Section 2.4 Sound Subsection 2.4.3 Specification for the recorded characteristic for magnetic sound records on16mm motion-picture film UDC 778.5.068.25:778.534.455:681.841BS5550-2.4.3:1986 This British Standard, hav
2、ing been prepared under the directionof the Cinematography and Photography Standards Committee, was published underthe authority of the Board ofBSI and comes into effect on 31December 1986 BSI 10-1999 First published March 1978 First revision December 1986 The following BSI references relate to the
3、work on this standard: Committee reference CPM/5 Draft for comment 83/39109 DC ISBN 0580 15513 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Cinematography and Photography Standards Committee (CPM/-) to Technical Committee CPM/5 upon
4、 which the following bodies were represented: Association of Cinematograph, Television and Allied Technicians Association of Independent Cinemas British Broadcasting Corporation British Film and Television Producers Association British Film Institute British Kinematograph, Sound and Television Socie
5、ty Cinematograph Exhibitors Association of Great Britain and Ireland Independent Television Companies Association Institute of Amateur Cinematographers Royal Photographic Society Amendments issued since publication Amd. No. Date of issue CommentsBS5550-2.4.3:1986 BSI 10-1999 i Contents Page Committe
6、es responsible Inside front cover National foreword ii 1 Scope and field of application 1 2 Recorded characteristic 1 3 Tolerances 1 Figure Tolerances on recorded level on 16 mm film 1 Table Numerical values of the recorded characteristic 1BS5550-2.4.3:1986 ii BSI 10-1999 National foreword This revi
7、sion of this Subsection of BS5550 has been prepared under the direction of the Cinematography and Photography Standards Committee and is identical with ISO1188:1984 “Cinematography Recorded characteristic for magnetic sound on full-coat16mm motion-picture film Specifications”, published by theIntern
8、ational Organization for Standardization (ISO). It supersedes BS5550-2.4.3:1978, which is identical with ISO1188:1974 “Cinematography Recording characteristics for magnetic sound records on16mm motion-picture film Specifications”, both these standards being withdrawn. In1979 asubstantial majority of
9、 countries including the UK considered that ISO1188should be revised. In this revision the characteristic is unchanged, but the tolerance on recorded levels is reduced, particularly with respect to high frequencies. In addition,16mm magnetic stripe is now excluded from the scope. Terminology and con
10、ventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been
11、used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “Subsection of BS5550”. A British Standard does not purport to inclu
12、de all 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, pagesi
13、 andii, page1 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.BS5550-2.4.3:1986 BSI 10-1999 1 1 Scope and field of application This International Standard specifies
14、 the recorded characteristic for magnetic sound records on16mm full-coat perforated magnetic film when used at the nominal speed of24frames 18,3cm (7.2in) per second, or25frames 19,05cm (7.5in) per second. 2 Recorded characteristic With constant sine-wave signal applied to the input of the recording
15、 system, the nominal characteristic in effective values of the short-circuit magnetic flux versus frequency should fall with increasing frequency in conformity with the impedance of a parallel combination of a capacitance and a resistance having a time constant t=704s. The characteristic defined abo
16、ve is represented by N = 10lg (1+4; 2 f 2 t 2 ) where N is the recorded characteristic in decibels; f is the frequency in hertz; t is the time constant in seconds. Numerical values are given in the Table. Table Numerical values of the recorded characteristics 3 Tolerances Magnetic sound records on f
17、ilms shall be recorded to the characteristic specified in clause2 within the tolerances given in the Figure. Frequency Hz dB 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1 000 1 250 1 600 2 000 2 500 3 150 4 000 5 000 6 300 8 000 0,13 0,13 0,13 0,13 0,12 0,12 0,11 0,10 0,08 0,05 0,00 0,07 0,1
18、9 0,37 0,64 1,01 1,61 2,36 3,31 4,52 5,99 7,53 9,25 11,13 10 000 12 500 16 000 12,95 14,81 16,90 NOTENumerical values of the recorded characteristic normalized to400Hz. Figure Tolerances on recorded level on 16 mm filmBS 5550-2.4.3: 1986 ISO1188:1984 BSI 389 Chiswick High Road London W4 4AL BSIBriti
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