1、Reference number ISO 6025:2000(E) ISO 2000 INTERNATIONAL STANDARD ISO 6025 Third edition 2000-11-01 Cinematography 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 SpcificationsI
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5、en below. ISO 2000 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member
6、 body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2000 All rights reservedISO 6025:2000(E) ISO 2000 All rights reserved iii Contents Page Forew
7、ord.iv 1 Scope 1 2 Normative references 1 3 Specifications 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).
8、2 6 Test films for checking and adjusting uniformity of 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
9、 of movement (flutter).8 Annex A (informative) Azimuth tolerance.9 Annex B (informative) Calculation of photoelectric output factor .10 Bibliography11ISO 6025:2000(E) iv ISO 2000 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of nation
10、al standards bodies (ISO member bodies). The work of preparing International Standards 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. Internatio
11、nal organizations, governmental and non-governmental, in liaison with ISO, also take 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 rule
12、s given in the ISO/IEC Directives, Part 3. 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 bodies casting a vote. Attention is drawn to the poss
13、ibility that some of the elements of this International Standard may be the subject of 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 can
14、cels and replaces the second edition (ISO 6025:1993), clause 1 and Table 7 of which have 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) ISO 2000 All rights
15、 reserved 1 Cinematography Analogue photographic sound test films, 35 mm and 16 mm Specifications 1 Scope 1.1 This International Standard specifies basic technical characteristics for the international exchange of analogue photographic sound test films intended for checking, adjusting and measuring
16、motion-picture projector sound systems and sound reproducing channels of motion-picture installations for monophonic 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 Intern
17、ational Standard includes test films intended for the checking, adjusting and measuring of a) focusing and azimuth 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 sev
18、eral motion-picture projectors, e) frequency response of the sound reproduction channel, and f) non-uniformity of film travel. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For
19、dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties 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
20、undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 69:1998, Cinematography 16 mm motion-picture and magnetic film Cutting and perforating dimensions. ISO 491:1995, Cinematogra
21、phy 35 mm motion-picture film and magnetic film Cutting and perforating dimensions. ISO 4243:1979, Cinematography Picture 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
22、 mm motion-picture prints Positions and width dimensions. IEC 60386:1972, Method of measurement of speed fluctuations in sound recording and reproducing equipment.ISO 6025:2000(E) 2 ISO 2000 All rights reserved 3 Specifications common to all types of photographic sound test films 3.1 Test films shal
23、l 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 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
24、 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 where 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 tole
25、rances given in this International Standard refer to that velocity. A speed of 25 frames per second may be used. Other test films may be developed 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 sig
26、nal 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, kHz 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, min
27、utes ( ) 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 checking 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 ad
28、justing 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 films 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 sig
29、nal, s 100ISO 6025:2000(E) ISO 2000 All rights reserved 3 The signal location and width dimensions shall be as given in Table 3. Table 3 35 mm (see Figure 1) 16 mm (see Figure 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 0,1
30、8 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 ISO 2000 All rights reserved a Reference edge Figure 2 16 mm buzz track 6 Test films for checking and adjusting uniformity of the scanning beam illumination
31、 (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 films Frequency, Hz 10 00 Modulation Maximum consistent with dimension C Maximum output deviation alo
32、ng 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) ISO 2000 All rights reserved 5 The signal location and width dimensions shall be as given in Table 5. Table 5 35 mm (see figure 3) 16 m
33、m (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 edge Figure 4 16 mm snake trackISO 6025:2000(E) 6 ISO 2000 All righ
34、ts reserved 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 1 000 400 Frequency tolerance, % 3 3 Fo
35、rm 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 should be taken to ensure that the modulat
36、ion 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 mm monophonic modulation is 43,4 %. (
37、See annex B for the calculation of POF.)ISO 6025:2000(E) ISO 2000 All rights reserved 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 Reference
38、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 (3 % + 2
39、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 set out
40、 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 ISO 2000 All rights reserved The characteristics of the test signal for checking and adjust
41、ing the frequency response 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
42、 1,0 Maximum output deviation 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
43、signal at all other frequencies, 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-uni
44、formity of film velocity 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 maximu
45、m, % 80 80 Maximum total 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) ISO 2000 All rights reserved 9 Annex A (informative) Azimuth
46、 tolerance It is desirable to reduce errors in azimuth 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 t
47、rack. Such an error could occur as a result of using 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 ISO 2000 All rights reserved Annex B (
48、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 used percentage modulation levels. The output level from any reproducer is d
49、etermined not only by the modulation on the test film, but also by the density of the dark and clear areas of the track. The POF chosen for both 35 mm and 16 mm in Table 6 are representative of current stereophonic 50 % level set films with track dimensions conforming to ISO 7343 for 35 mm and ISO 7739 1) for 16 mm. The POF of an “ideal“ test film can be calculated using the following: Maxim
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