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1、BRITISH STANDARD BS ISO 8395:1995 Implementation of ISO 8395:1995 Cinematography Test films for the reproduction of 70 mm motion-picture release prints with magnetic stripes Specifications ICS 37.060.20 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:40:15 GMT+00:00 2006, Uncontrolled Copy
2、, (c) BSI BS ISO 8395:1995 This British Standard, having been prepared under the direction of the Consumer Products and Services Sector Board, was published under the authority of the Standards Board and comes into effect on 15 October 1995 BSI 02-2000 The following BSI references relate to the work
3、 on this standard: Committee reference CPM/5 Draft for comment 94/303019 DC ISBN 0 580 24800 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee CPM/5, Audio Technology, upon which the following bodies were represented: Ass
4、ociation of Independent Cinemas British Broadcasting Corporation British Film and Television Producers Association British Film Institute British Kinematograph, Sound and Television Society Broadcasting Entertainment Cinematograph and Theatre Union Cinema Exhibitors Association ITV Association (ITVA
5、) Institute of Amateur Cinematographers Royal Photographic Society Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 8395:1995 BSI 02-2000i Contents Page Committees responsibleIns
6、ide front cover National forewordii Forewordiii Text of ISO 83951 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 8395:1995 ii BSI 02-2000 National foreword This British Standard reproduces verbatim ISO 8395:1995 and implements it as
7、the UK national standard. This British Standard is published under the direction of the Consumer Products and Services Sector Board whose Technical Committee CPM/5 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on int
8、erpretation, or proposals for change, and keep UK interests informed; 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, Lon
9、don W4 4AL. A British 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. Summary of pages This documen
10、t comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 4, an inside back cover 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 th
11、e inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 8395:1995(E) ii BSI 02-2000 Contents Page Forewordiii 1Scope
12、1 2Normative references1 3Types of test film1 4Specifications2 Annex A (informative) Behavioural characteristics of film base Inside back cover Annex B (informative) BibliographyInside back cover Table 1 Characteristics of test signal for checking and adjusting azimuth2 Table 2 Characteristics of te
13、st signal for checking and adjusting reference flux electrical output2 Table 3 Characteristics of test signal for checking and adjusting frequency response3 Table 4 Calculated relative levels in decibels against frequency3 Table 5 Characteristics of test signals for measuring non-uniformity in veloc
14、ity of film travel (flutter)4 Descriptors: Cinematography, sound recording, magnetic recording, sound reproduction, recording tracks, motion-picture film, motion-picture film 70 mm, reference sample, specifications. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:40:15 GMT+00:00 2006, Unco
15、ntrolled Copy, (c) BSI ISO 8395:1995(E) BSI 02-2000iii Foreword ISO (the International Organization 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.
16、 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-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the Interna
17、tional Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bod
18、ies casting a vote. International Standard ISO 8395 was prepared by Technical Committee ISO/TC 36, Cinematography. Annex A and Annex B of this International Standard are for information only. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI i
19、v blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 8395:1995(E) BSI 02-20001 1 Scope This International Standard specifies basic technical characteristics for magnetic sound test films used for checking, adjusting and measuring 70 m
20、m motion-picture projector sound systems and sound reproduction channels of motion-picture installations. This International Standard includes specifications for test films intended for checking, adjusting and measuring of: a) azimuth of the magnetic head gaps (azimuth alignment test film; see Table
21、 1); b) output level balance of several motion-picture projectors or systems and interchannel balance on each projector or system (signal level test film; see Table 2); c) frequency response of the sound reproduction channels (multi-frequency test film; see Table 3 and Table 4); d) non-uniformity in
22、 velocity of film travel (flutter) (flutter test film; see Table 5). 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All stand
23、ards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO
24、266:, Acoustics Preferred frequencies1). ISO 2404:1986, Cinematography Six-track magnetic sound records on 70 mm striped release prints Locations and dimensions. ISO 3023:1995, Cinematography 65 mm and 70 mm unexposed motion-picture film Cutting and perforating dimensions. ISO 8590:1994, Cinematogra
25、phy Audio records on 70 mm motion-picture release prints with magnetic stripes Recorded characteristic. ANSI S4.6:1982, Recorded flux of magnetic sound records at medium wavelengths, methods of measuring. ANSI/IEEE 152:1992, Audio Program Level Measurement. CCIR Report 79-2:1994, Measurement of the
26、characteristics of sound signals recorded on magnetic tape. DIN 45520:1973, Magnetic tape recorders; measurement of the absolute level of the magnetic flux and its frequency response on magnetic tapes. EBU Technical Document 3205-E:1979, The EBU standard peak-programme meter for the control of inter
27、national transmissions. IEC 386:1972, Method of measurement of speed fluctuations in sound recording and reproducing equipment. 3 Types of test film It is recognized that two different types of magnetic test film are used for the evaluation and adjustment of magnetic film reproducers. These test fil
28、ms differ in the way their magnetic flux levels are measured, and in the detailed procedures of their application in system evaluation and adjustment. In this International Standard, both types of magnetic test film are specified, according to the following definitions. a) Type 185 Magnetic flux lev
29、els are measured using the procedures specified in ANSI S4.6 and CCIR 79-2. The reference short-circuit flux level shall be 185 nWb/m. The test film signal output level shall be 6 dB below the reference flux level. These test films were developed for use generally in countries with a mains frequency
30、 of 60 Hz, and for measurement with VU meters conforming to ANSI/IEEE 152. NOTE 1The method for measuring magnetic flux level given in ANSI S4.6 uses a special reproducing head with two symmetrical gaps. The magnetic film to be measured is run in contact with the front gap and then in contact with t
31、he rear gap. The flux is calculated from the two EMF values and the head data. b) Type 320 Magnetic flux levels are measured using the procedures specified in DIN 45520. The reference short-circuit flux level shall be 320 nWb/m. The test film signal output level shall be 10 dB below the reference fl
32、ux level. These test films were developed for use generally in countries with a mains frequency of 50 Hz, and for measurement with SPP meters conforming to EBU Technical Document 3205-E. NOTE 2The method for measuring magnetic flux level given in DIN 45520 uses a search coil to sense the flux of a v
33、ery long wavelength recording. The recording head is then fed with the same current, but at the reference frequency to produce a recording for calibrating a high-efficiency reproducing head. 1) To be published. (Revision of ISO 266:1975) Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:40:1
34、5 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 8395:1995(E) 2 BSI 02-2000 The calibration of a magnetic film reproducer resulting from the use of a Type 320 magnetic test film will differ from that obtained from the use of a Type 185 magnetic test film, and will generally give a result about 1 dB
35、higher for identical flux levels. 4 Specifications 4.1 Test films shall be made on motion-picture film, the cutting and perforating dimensions of which are in accordance with ISO 3023. (See also Annex A). 4.2 Location and width dimensions of sound records shall be in accordance with ISO 2404. 4.3 Ma
36、gnetic recording characteristics for multifrequency test film shall be in accordance with ISO 8590. 4.4 Test films shall be splice-free, except where joins are an essential part of the test film. 4.5 70 mm test films shall be recorded at a film velocity equivalent to 24 frames (120 perforations) per
37、 second nominally 570 mm (22,4 in) per second. All frequency and velocity tolerances shall relate to this stated velocity. 4.6 Each test film shall be provided with written identification on the outside of the container, including the following information: type of test film (Type 185 or Type 320),
38、function of the film, base material (triacetate or polyester), date and place of recording, and a statement that the test film conforms to this International Standard. 4.7 Within multifrequency test films, each frequency shall be identified by voice announcements preceding that frequency segment. Th
39、e peak level of voice announcements shall not exceed the peak level of modulation. 4.8 If multi-track test films are made on a fully magnetic coated motion-picture film, the individual records shall be made in accordance with this International Standard, including the specific International Standard
40、s referenced in clause 2. Table 1 Characteristics of test signal for checking and adjusting azimuth (azimuth alignment test film) Table 2 Characteristics of test signal for checking and adjusting reference flux electrical output (signal level test film) CharacteristicValue Signal frequency Frequency
41、 tolerance Azimuth tolerance for each track Type 185 signal output level Type 320 signal output level Output uniformity Minimum duration of signal 16 kHz 3 % 3 6 dB below reference flux level 10 dB below reference flux level 0,5 dB 100 s CharacteristicValue Signal frequency Frequency tolerance Type
42、185 reference short-circuit flux Type 320 reference short-circuit flux Reference flux tolerance Output uniformity Harmonic distortion, total Flutter, IEC weighted Minimum duration of signal 1 000 Hz 3 % 185 nWb/m 320 nWb/m 10 nWb/m 0,5 dB 2 % 0,1 % 60 s NOTEBecause of the differences in calibration
43、procedures, Type 185 reference flux is actually only about 3,8 dB below Type 320 reference flux (see clause 3, notes 1 and 2). Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 12:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 8395:1995(E) BSI 02-20003 Table 3 Characteristics of test sign
44、al for checking and adjusting frequency response (multi-frequency test film) Table 4 Calculated relative levels in decibels against frequency (see 4.12.1) CharacteristicValue Reference signal frequency Type 185 signal output level at reference frequency Type 320 signal output level at reference freq
45、uency Short-circuit flux tolerance at all frequencies Output uniformity at all frequencies Output deviation within each frequency Time constant characteristics Frequency tolerance at all frequencies Minimum duration of signal at reference frequency Minimum duration of signal at all other frequencies
46、 1 000 Hz 6 dB below 185 nWb/m 10 dB below 320 nWb/m 0,5 dB 0,5 dB 0,3 dB 3 180 4s and 35 4s (3 % + 2 Hz) 20 s 8 s Frequency series in order of their location in the test film Short-circuit fluxa Relative levelb HznWb/mdB Type 185Type 320 1 000c 20d 25d 31,5 40 50 63 80 125 160d 250 315 400 500 1 00
47、0c 2 000 3 150 6 300 8 000 10 000 12 500 16 000 92,7 255,5 212,2 178,0 151,9 134,1 121,1 111,8 102,1 99,3 96,6 95,8 95,2 94,7 92,7 86,8 78,0 55,5 46,9 39,2 32,4 25,9 101,2 278,9 231,6 194,3 165,7 146,4 132,1 122,0 111,4 108,4 105,4 104,5 103,9 103,4 101,2 94,8 85,1 60,6 51,1 42,8 35,4 28,3 0 8,80 7,
48、19 5,66 4,29 3,21 2,32 1,63 0,84 0,59 0,35 0,28 0,23 0,19 0 0,57 1,51 4,46 5,93 7,47 9,13 11,07 a See notes 1 and 2 in clause 3. b Calculation based on a normalizing constant of 0,194 244 3. c Reference frequency and normalization point for the response curve. d Optional frequency. Licensed Copy: sh
49、effieldun sheffieldun, na, Sun Nov 26 12:40:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 8395:1995(E) 4 BSI 02-2000 Table 5 Characteristics of test signals for measuring non-uniformity in velocity of film travel (flutter) (flutter test film) 4.9 Test films recorded to a wider track width than the reproducing head will cause the head to gather fringe effect flux at long wavelengths. A correction shall, therefore, be applied to simulate the normal effect on the head of a standard