1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS ISO 6025:2000 ICS 37.0
2、60.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Cinematography Analogue photographic sound test films, 35 mm and 16 mm SpecificationsThis British Standard, having been prepared under the direction of the Consumer Products and Services Sector Committee, was published unde
3、r the authority of the Standards Committee and comes into effect on 15 April 2001 BSI 04-2001 ISBN 0 580 37289 8 BS ISO 6025:2000 Amendments issued since publication Amd. No. Date Comments National foreword This British Standard reproduces verbatim ISO 6025:2000 and implements it as the UK national
4、standard. It supersedes BS ISO 6025:1993 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee CPW/36, Cinematography, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enq
5、uiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The Br
6、itish Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A Brit
7、ish 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 document comprises a fron
8、t cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 11 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.Reference number ISO 6025:2000(E) INTERNATIONAL STANDARD ISO 6025 Third edition 2000-11-01 Cinematograph
9、y Analogue photographic sound test films, 35 mm and 16 mm Specifications Cinmatographie Films pour les essais denregistrement sonore photographique analogue, 35 mm et 16 mm SpcificationsISO6025:2000(E) ii ISO 6025:2000(E)iii Contents Page Foreword.iv 1 Scope 1 2 Normative references 1 3 Specificatio
10、ns common to all types of photographic sound test films .2 4 Test films for checking and adjusting sound focus and azimuth 2 5 Test films for checking and adjusting the lateral position of the film in relation to the scanning beam (buzz track).2 6 Test films for checking and adjusting uniformity of
11、the scanning beam illumination (snake track) .4 7 Variable area modulated test films for checking and adjusting sound level 6 8 Test films for checking and adjusting frequency response7 9 Test films for measuring non-uniformity of film velocity of movement (flutter).8 Annex A (informative) Azimuth t
12、olerance.9 Annex B (informative) Calculation of photoelectric output factor .10 Bibliography11ISO 6025:2000(E) iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standard
13、s 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-governmental, in liaison with ISO, also take
14、part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by t
15、he technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject o
16、f patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 6025 was prepared by Technical Committee ISO/TC 36, Cinematography. This third edition cancels and replaces the second edition (ISO 6025:1993), clause 1 and Table 7 of which h
17、ave been revised. Clause 2 has also been revised and a bibliography has been added. Annexes A and B of this International Standard are for information only.INTERNATIONAL STANDARD ISO 6025:2000(E)1 Cinematography Analogue photographic sound test films, 35 mm and 16 mm Specifications 1 Scope 1.1 This
18、International Standard specifies basic technical characteristics for the international exchange of analogue photographic sound test films intended for checking, adjusting and measuring motion-picture projector sound systems and sound reproducing channels of motion-picture installations for monophoni
19、c or stereophonic reproduction. 1.2 This International Standard specifies types and technical characteristics of test films made on 35 mm and 16 mm motion-picture films. 1.3 This International Standard includes test films intended for the checking, adjusting and measuring of a) focusing and azimuth
20、of the scanning beam, b) scanning beam width and its position relative to the reference edge of the film, c) uniformity of the scanning beam illumination, d) level output balance of several motion-picture projectors, e) frequency response of the sound reproduction channel, and f) non-uniformity of f
21、ilm travel. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parti
22、es to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC mainta
23、in registers of currently valid International Standards. ISO 69:1998, Cinematography 16 mm motion-picture and magnetic film Cutting and perforating dimensions. ISO 491:1995, Cinematography 35 mm motion-picture film and magnetic film Cutting and perforating dimensions. ISO 4243:1979, Cinematography P
24、icture image area and photographic sound record on 16 mm motion-picture release prints Positions and dimensions. ISO 7343:1993, Cinematography Two-track photographic sound records on 35 mm motion-picture prints Positions and width dimensions. IEC 60386:1972, Method of measurement of speed fluctuatio
25、ns in sound recording and reproducing equipment.ISO 6025:2000(E) 2 3 Specifications common to all types of photographic sound test films 3.1 Test films shall be made on motion-picture raw stock films, the cutting and perforating dimensions of which shall be in accordance with ISO 491 for 35 mm film
26、and ISO 69 for 16 mm film. 3.2 The film stock should preferably be polyester base or low-shrinkage triacetate base. 3.3 The location and width dimensions of sound records shall be in accordance with ISO 7343 for 35 mm film and ISO 4243 for 16 mm film. 3.4 Test films shall be splice-free, except wher
27、e joins are an essential part of the test film. 3.5 Each film shall be intended primarily for use at 24 frames per second. All frequencies and velocity tolerances given in this International Standard refer to that velocity. A speed of 25 frames per second may be used. Other test films may be develop
28、ed for use at other speeds, if the speeds are so stated. 4 Test films for checking and adjusting sound focus and azimuth The characteristics of the test signal for checking and adjusting sound focus and azimuth shall be as given in Table 1. Table 1 Test signal characteristic 35 mm 16 mm Frequency, k
29、Hz 9 7,1 Frequency tolerance, % 3 3 Maximum output deviation, dB 0,3 0,5 Azimuth angle (relative to reference edge), degrees ()9 09 0 Azimuth tolerance, minutes ( ) a 5 5 Minimum modulation as a percentage of maximum, % 80 80 Minimum duration of signal, s 100 100 a See annex A. 5 Test films for chec
30、king and adjusting the lateral position of the film in relation to the scanning beam (buzz track) The characteristics of the test signal for checking and adjusting the lateral position of the film in relation to the scanning beam shall be as given in Table 2. Table 2 Test signal characteristic All f
31、ilms Frequency on the picture image side, Hz 300 Frequency on the opposite side, Hz 1 000 Frequency tolerance, % 10 Form Square wave Minimum duration of signal, s 100ISO 6025:2000(E)3 The signal location and width dimensions shall be as given in Table 3. Table 3 35 mm (see Figure 1) 16 mm (see Figur
32、e 2) Dimension mm in mm in A 5,10 0,03 0,201 0,001 13,58 0,03 0,535 0,001 B 7,23 0,03 0,285 0,001 15,39 0,03 0,606 0,001 C 0,18 min. 0,007 min. 0,30 min. 0,012 min. D 0,30 min. 0,012 min. 0,18 min. 0,007 min. a Reference edge Figure 1 35 mm buzz trackISO 6025:2000(E) 4 a Reference edge Figure 2 16 m
33、m buzz track 6 Test films for checking and adjusting uniformity of the scanning beam illumination (snake track) The characteristics of the test signal for checking and adjusting the uniformity of the scanning beam illumination shall be as given in Table 4. Table 4 Test signal characteristic All film
34、s Frequency, Hz 10 00 Modulation Maximum consistent with dimension C Maximum output deviation along the whole of the test film, dB 0,5 Duration of signal a ,s 6 a The traverse of the snake track shall not be less than the duration of the signal.ISO 6025:2000(E)5 The signal location and width dimensi
35、ons shall be as given in Table 5. Table 5 35 mm (see figure 3) 16 mm (see figure 4) Dimension mm in mm in A 5,20 0,03 0,205 0,001 13,66 0,03 0,538 0,001 B 7,13 0,03 0,281 0,001 15,31 0,03 0,603 0,001 C 0,18 max. 0,007 max. 0,13 max. 0,005 max. a Reference edge Figure 3 35 mm snake track a Reference
36、edge Figure 4 16 mm snake trackISO 6025:2000(E) 6 7 Variable area modulated test films for checking and adjusting sound level The characteristics of the test signal for checking and adjusting the sound level shall be as given in Table 6. Table 6 Test signal characteristic 35 mm 16 mm Frequency, Hz 1
37、 000 400 Frequency tolerance, % 3 3 Form Sinusoidal Sinusoidal Maximum total harmonic distortion, % 3 5 Maximum output deviation, dB 0,5 0,5 Photoelectric output factor (for nominal 50 % modulation) a 0,344 0,368 Minimum duration of signal, s 60 60 NOTE If the track format is multilateral, care shou
38、ld be taken to ensure that the modulation in each element is equal. a The photoelectric output factors (POF) given here are for 35 mm stereophonic films using a 0,254 mm (0,010 in) septum between tracks and a receptor with no dead area between tracks and for 16 mm monophonic films. The equivalent 35
39、 mm monophonic modulation is 43,4 %. (See annex B for the calculation of POF.)ISO 6025:2000(E)7 8 Test films for checking and adjusting frequency response The frequencies for test films for checking and adjusting the frequency response shall be as given in Table 7. Table 7 Frequencies 35 mm 16 mm Re
40、ference frequency, Hz 1 000 400 Frequency series in order of their location in the test film, Hz 31,5 40 40 63 a 63 a 125 a 125 a 250 250 500 500 10 00 10 00 20 00 20 00 31 50 31 50 40 00 40 00 50 00 50 00 63 00 63 00 71 00 71 00 80 00 80 00 90 00 10 000 11 200 12 500 1 000 400 Frequency tolerance (
41、3 % + 2 Hz) (3 % + 2 Hz) If a pink noise section is included on the test film, the pink noise shall be recorded in such a way that the level within a 1/3 octave band with the centre frequency equal to any of the frequencies given in the appropriate series in this table shall be within the tolerances
42、 set out in Table 8. a In countries where the power mains are operated at 60 Hz, the frequencies of 63 Hz and 125 Hz may be replaced by 50 Hz and 100 Hz to minimize the effects of narrow band noise.ISO 6025:2000(E) 8 The characteristics of the test signal for checking and adjusting the frequency res
43、ponse tolerance shall be as given in Table 8. Table 8 Test signal characteristic 35mm 16 mm Form Sinusoidal Sinusoidal Modulation a ,% 50 50 Maximum output level deviation of the test film at any frequency, when compared with the average output at the reference frequency, dB 0,5 1,0 Maximum output d
44、eviation within each frequency, dB 0,3 0,5 Maximum total harmonic distortion at any of the test film frequencies up to the given frequency 3%u pt o5kHz 5%u pt o3kHz Azimuth tolerance, minutes ( ) 5 5 Minimum duration of signal at reference frequency, s 20 20 Minimum duration of signal at all other f
45、requencies, s 8 8 a If the track format is multilateral, care should be taken to ensure that the modulation in each element is equal. 9 Test films for measuring non-uniformity of film velocity of movement (flutter) The characteristics of the test signal for measuring the non-uniformity of film veloc
46、ity of movement shall be as given in Table 9. Table 9 Test signal characteristic 35 mm a 16 mm Frequency at 24 frames per second, Hz 3 150 3 150 Tolerance on frequency, Hz 25 25 Form Sinusoidal or square wave Sinusoidal or square wave Minimum modulation as a percentage of maximum, % 80 80 Maximum to
47、tal weighted wow and flutter content, measured in accordance with IEC 60386, % 0,05 0,08 Maximum output deviation, dB 1,0 1,0 a This test film may not be suitable for use with some older flutter meters.ISO 6025:2000(E)9 Annex A (informative) Azimuth tolerance It is desirable to reduce errors in azim
48、uth setting as much as possible. An azimuth difference of 10 of arc between a sound track image and the reproducer scanning slit would result, at 9 kHz, in a phase incoherence of approximately 40 at the opposite edges of a 35 mm photographic sound track. Such an error could occur as a result of usin
49、g test films made at the extreme limits of a 5 tolerance on azimuth. It is therefore recommended that every effort should be made to record test films within an azimuth tolerance of 2 of arc.ISO 6025:2000(E) 10 Annex B (informative) Calculation of photoelectric output factor The use of photoelectric output factor (POF) to specify the modulation level in Table 6 is a major departure from earlier editions of this International Standard which
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