BS 5550-4 4 1-1992 Cinematography - 65 mm and 70 mm film - Sound - Specification for the location and dimensions of six-track magnetic sound records on 70 mm motion-picture release.pdf

1、BRITISH STANDARD BS 5550-4.4.1: 1992 ISO 2404:1986 Cinematography Part 4: 65 mm and 70 mm film Section 4.4 Sound Subsection 4.4.1 Specification for the location and dimensions of six-track magnetic sound records on70mm motion-picture release prints with magnetic stripesBS5550-4.4.1:1992 This British

2、 Standard, having been prepared under the directionof the Cinematography and Photography Standards PolicyCommittee, was publishedunder the authority ofthe Standard Board and comesinto effect on 15July1992 BSI 10-1999 First published February 1980 Second edition July 1992 The following BSI references

3、 relate to the work on this standard: Committee references CPM/5 Draft for comment 85/44695 DC ISBN 0 580 20998 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Cinematography and Photography Standards Policy Committee (CPM/-) to Techni

4、cal Committee CPM/5, upon which the following bodies were represented: Association of Independent Cinemas British Broadcasting Corporation British Film and Television Producers Association British Film Institute British Kinematograph, Sound and Television Society Broadcasting Entertainment and Cinem

5、atograph Technicians Union Cinematograph Exhibitors Association of Great Britain and Northern Ireland ITV Association Institute of Amateur Cinematographers Royal Photographic Society Amendments issued since publication Amd. No. Date CommentsBS5550-4.4.1:1992 BSI 10-1999 i Contents Page Committees re

6、sponsible Inside front cover National foreword ii 1 Scope and field of application 1 2 Reference 1 3 Dimensions 1 4 Alignment of heads 1 5 Sound recording 1 6 Picture-sound displacement 1 7 Reproducing speed 1 Figure 2BS5550-4.4.1:1992 ii BSI 10-1999 National foreword This revision of this Subsectio

7、n of BS5550 has been prepared under the direction of the Cinematography and Photography Standards Policy Committee. It is identical with ISO2404:1986 Cinematography Six-track magnetic sound records on70mm striped release prints Locations and dimensions, published by the International Organization fo

8、r Standardization (ISO). This Subsection of BS5550 supersedes BS5550-4.4.1:1980, which is withdrawn. In reviewing ISO2404:1979 (adopted as BS5550-4.4.1:1980), the UK anticipated and supported the US proposals to change magnetic stripe widths, as given in clause3. The UK requested that magnetic heads

9、 be more accurately aligned, and that, in clause4, “90 5” be changed to “90 3”. Other countries accepted this UK proposal, duly incorporated in this revision. Additional information. It should be noted that it is difficult to maintain the same distance from the film edge to the outer edge of the mag

10、netic stripes. Liquid stripe lacquer is applied to a moving film base, and the resulting sound track has a slightly wavy edge. This dimension (given as F at one edge of the film and G at the other edge of the film in ISO 2404:1979, and given as B at each edge of the film in this revision) has been c

11、hanged from0.1mm to0.2mm. NOTEThe latest edition of ISO3023 is ISO3023:1988; it was not published at the time of publication of ISO2404:1986. ISO3023:1988 was not adopted as a British Standard since it contained only editorial changes. A British Standard does not purport to include all the necessary

12、 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-reference International Standard Corresponding British Standard ISO 3023:1974 BS 5550 Cinematograph

13、y Subsection 4.1.1:1978 Specification for cutting and perforating dimensions of 65 mm and 70 mm motion-picture film (Identical) Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and2 and a back cover. This standard has been updated (see copyright dat

14、e) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5550-4.4.1:1992 BSI 10-1999 1 1 Scope and field of application This International Standard specifies the locations and the width dimensions of magnetic stripes and recording and rep

15、roducing gaps of magnetic heads for six-track magnetic sound records on70mm striped release prints on safety base stock cut and perforated in accordance with ISO3023. 2 Reference ISO 3023, Cinematography 65 mm and 70 mm unexposed motion-picture film Cutting and perforating dimensions. 3 Dimensions T

16、he locations and width dimensions of magnetic stripes and gaps of magnetic heads shall be as shown in theFigure and as given in the table. NOTE 1For reference only. NOTE 2The locations and width dimensions of magnetic stripes and recording gaps of magnetic heads are chosen on the assumption that the

17、 lateral film shrinkage is within the range of0 to0,2% at the time of striping and/or recording. NOTE 3The locations of reproducing gaps of magnetic heads for projectors are chosen on the assumption that the lateral film shrinkage at the time of presentation is0,2% greater than at the time of stripi

18、ng. The locations of reproducing gaps of magnetic heads in the equipment used for the production of release prints can be the same as that for the recording heads. 4 Alignment of heads The gaps of recording and reproducing magnetic heads respectively shall be in line at an angle of90 3 to the direct

19、ion of the film travel. 5 Sound recording For the listener facing the screen, the stripes shall be used for the sound recording for the following channels: Stripe No. 1 for the extreme left channel Stripe No. 2 for the left central channel Stripe No. 3 for the central channel Stripe No. 4 for the ri

20、ght central channel Stripe No. 5 for the extreme right channel Stripe No. 6 for the loudspeakers in auditorium or for recording (monitoring) signals inaudible to a spectator Audio records No.4 and5 shall be recorded adjacent to the frameline identifier as shown in theFigure. NOTEIn special motion-pi

21、cture films, for achieving certain sound effects, some other arrangement of the stripes on the release print is warranted. 6 Picture-sound displacement The magnetic sound records on the film shall lag behind the centre of the corresponding picture by a distance of24 1/2 frames. NOTEWith the picture-

22、sound displacement on the film of24frames and the projector threaded at25 frames, synchronization of picture and sound will be correct for an observer at a distance of about15m (50ft) from the screen. 7 Reproducing speed The recording shall be made so that the sound records will reproduce properly a

23、t120 perforations per second, i.e.24 frames (5 perforations each) per second. This results in a linear speed of approximately34m/min (112ft/min). Dimension mm in A (see note 1) 69,95 2.754 B 0,20 0,05 0.008 0.002 C 5,28 0,05 0.208 0.002 D 8,38 0.330 E 10,54 0,05 0.415 0.002 F 1,27 0,05 0.050 0.002 G

24、 2,92 0,05 0.115 0.002 H 8,20 0,05 0.323 0.002 K 59,21 0,05 2.331 0.002 L (width) 1,90 0,05 0.075 0.002 M 64,50 0,05 2.539 0.002 N 67,41 0,05 2.654 0.002 Q (width) 1,78 0,05 0.070 0.0020,05 + 00.002 + 0BS5550-4.4.1:1992 2 BSI 10-1999 The figure shows the film as seen from the light source in the pro

25、jector arranged for projection onto a reflection type screen. With the direction of film travel as shown in theFigure, the photographic layer is on the side of the film facing the light source and the magnetic coating is on the side of the film away from the light source. Figure 3 blankBS 5550-4.4.1

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