1、BRITISH STANDARD BS5550-2.4.4: 1980 ISO4242:1980 Cinematography Part2:16mm film Section2.4 Sound Subsection2.4.4 Specification for positions and width dimensions of recording head gaps for two sound records on16mm magnetic film UDC 778.5.068.25:778.534.455:681.84.083.82BS5550-2.4.4:1980 This British
2、 Standard, having been prepared under the directionof the Cinematograph Standards Committee, was published under the authorityofthe Executive Boardand comes into effect on 31 December1980 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference CMS/23 Draft f
3、or comment75/62490DC ISBN 0 580 11771 5 Cooperating organizations The Cinematograph Standards Committee, under whose direction this BritishStandard was prepared, consists of representatives from the following: Association of Cinematograph, Television and Allied Technicians Association of Film Labora
4、tory Employers* British Broadcasting Corporation* British Film Institute British Kinematograph, Sound and Television Society* British Photographic Association Chartered Institution of Building Services Cinematograph Exhibitors Association of Great Britain and Ireland* Film Production Association of
5、Great Britain* Independent Television Companies Association* Royal Photographic Society* The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: Association
6、 of Independent Cinemas Institute of Amateur Cinematographers Coopted members Amendments issued since publication Amd. No. Date of issue CommentsBS5550-2.4.4:1980 BSI 10-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii 1 Scope and field of application 1 2 Refere
7、nces 1 3 Location and width of magnetic head gaps 1 4 Recorded characteristic 1 5 Velocity 1 6 Track usage 1 Figure Magnetic sound records and head gaps 2 Table Dimensions of sound records and head gap widths 2 Publications referred to Inside back coverBS5550-2.4.4:1980 ii BSI 10-1999 National forew
8、ord This British Standard is identical with ISO4242 “Cinematography Recording head gaps for two sound records on16mm magnetic film Positions and width dimensions” published in 1980 by the International Organization for Standardization (ISO). It supersedes BS5550-2.4.2:1978 and BS5550-2.4.5:1978 both
9、 of which are now withdrawn. BS5550 is to encompass eventually all British Standards on cinematography. BSI Sectional List1, obtainable free from the BSI Sales Department, catalogues the British Standards on cinematography. The latest edition of SL1 should be referred to particularly in view of this
10、 development. Terminology and conventions. The text of the International Standard has been approved as suitable for publication, without deviation, as a BritishStandard. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to
11、the following. Where the words “International Standard” appear, referring to this standard, they should be read as “British Standard” The comma has been used in some places as a decimal marker. In BritishStandards it is current practice to use a full point on the baseline as the decimal marker. A Br
12、itish Standard does not purport to include 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. Cross-references International Standard Corre
13、sponding British Standard ISO69:1974 BS5550 Cinematography Subsection2.1.1:1980 aSpecification for dimensions of16mm motion-picture film (Technically equivalent) ISO1188:1974 BS5550 Cinematography Subsection2.4.3:1978 Specification for recording characteristics for magnetic sound record on16mm motio
14、n-picture film (Identical) a This standard was previously numbered BS4526-2 and has been renumbered by amendment. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and 2, an inside back cover and a back cover. This standard has been updated (see copy
15、right date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5550-2.4.4:1980 BSI 10-1999 1 1 Scope and field of application This International Standard specifies the lateral positions and width dimensions of the recording heads for t
16、wo magnetic sound records and a control track on16mm single perforated magnetic recording film. It also specifies the reproducing velocity of the film travel. 2 References ISO69, Cinematography 16mm motion-picture raw stock film Cutting and perforating dimensions. ISO1188, Cinematography Recording c
17、haracteristics for magnetic sound record on16mm motion-picture film Specifications. 3 Location and width of magnetic head gaps 3.1 The width dimensions and lateral positions of the magnetic head gaps shall be as shown in the Figureand given in the Table. 3.2 The magnetic head gaps shall be physicall
18、y in line at an angle of90 5 to the direction of film travel. 4 Recorded characteristic The recorded characteristic shall be in accordance with ISO1188. 5 Velocity 5.1 The sound records are intended for use at velocities of24perforations (approximately18,3cm or7.2in) per second or at25perforations (
19、approximately19,05cm or7.5in) per second. 5.2 The tolerances given in ISO1188 (clause3) permit a choice of operating conditions such that the recorded characteristic conforms to ISO1188 even though the recording is intended for either24 or25 perforations per second, and the reproduction is conducted
20、 at the other velocity. 6 Track usage 6.1 The centre track position shall preferably be used for single records. However, for international exchange, interchangeability is facilitated by placing identical information on both tracks. 6.2 For recording stereo programmes, the centre track position shal
21、l be used for the left-hand channel. 6.3 For recording two languages, the centre track shall be used for the primary language and the edge track position shall be used for the secondary language. 6.4 The control track shall be used for recording other information and for address systems in analogue
22、or digital form.BS5550-2.4.4:1980 2 BSI 10-1999 Table Dimensions of sound records and head gap widths Figure Magnetic sound records and head gaps Dimensions mm in A B C a D a E F (reference) 2,05 0,05 5,95 0,05 13,45 0,05 4,0 0,7 15,95 0.081 0.002 0.234 0.002 0.529 0.002 0.157 0.028 0.628 a The inch
23、 dimension C deviates from the standard conversion practice to reflect the practices in those countries where that system is used. b To prevent the erase head overlapping the film edge, a dimension of3,8 0 0,1 mm (0.150 0 0.004 in) is preferred in some countries. 0 0,1 0 0,1 0 0.004 0 0.004BS5550-2.
24、4.4:1980 BSI 10-1999 Publications referred to See national foreword.BS5550-2.4.4: 1980 ISO4242:1980 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe
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