ISO 8395:1995

Cinematography — Test films for the reproduction of 70 mm motion-picture release prints with magnetic stripes — Specifications

Specifies basic technical characteristics for magnetic sound test films used for checking, adjusting and measuring 70 mm motion-picture projector sound systems and sound reproduction channels of motion-picture installations. Includes specifications for test films intended for checking, adjusting and measuring of azimuth of the magnetic head gaps; output level balance of several motion-picture projectors or systems and interchannel balance on each projector or system; frequency response of the sound reproduction channels and non-uniformity in velocity of film travel.

Cinématographie — Films étalons pour la reproduction sonore des tirages cinématographiques sur films de 70 mm avec pistes magnétiques — Spécifications

General Information

• Status: Published
• Publication Date: 10-May-1995
• ICS: 37.060.20 - Motion picture films. Cartridges
• Technical Committee: ISO/TC 36 - Cinematography
• Drafting Committee: ISO/TC 36/WG 3 - Audio technology
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 10-Jul-2023

Standards Content (Sample)

INTERNATIONAL Is0
STANDARD 8395
First edition
1995-05-I 5
Cinematography - Test films for the
reproduction of 70 mm motion-picture
release prints with magnetic stripes -
Specifications
Cin6ma tographie - Films &talons pour la reproduction sonore des tirages
cin6matographiques sur films de 70 mm avec pistes magnktiques -
Spkifications
Reference number
IS0 8395: 1995(E)

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IS0 8395:1995(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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 part in the work. IS0
collaborates closely with the International Electrotechnical Commission
(I EC) 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 bodies casting
a vote.
International Standard IS0 8395 was prepared by Technical Committee
lSO/TC 36, Cinematography.
Annexes A and B of this International Standard are for information only.
0 IS0 1995
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 photocopyrng and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
II

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INTERNATIONAL STANDARD 0 ISO IS0 8395: 1995(E)
- Test films for the reproduction of
Cinematography
70 mm motion-picture release prints with magnetic
- Specifications
stripes
to investigate the possibility of applying the most re-
1 Scope
cent editions of the standards indicated below.
Members of IEC and IS0 maintain registers of cur-
This International Standard specifies basic technical
rently valid International Standards.
characteristics for magnetic sound test films used for
checking, adjusting and measuring 70 mm motion-
IS0 266: ---J, Acoustics
- Preferred frequencies.
picture projector sound systems and sound repro-
duction channels of motion-picture installations.
IS0 2404: 1986, Cinematography - Six-track mag-
netic sound records on 70 mm striped release prints
This International Standard includes specifications
- Locations and dimensions.
for test films intended for checking, adjusting and
measuring of:
IS0 3023:1995, Cinematography - 65 mm and 70
mm unexposed motion-picture film - Cutting and
azimuth of the magnetic head gaps (azimuth
a)
perforating dimensions.
alignment test film; see table I);
IS0 8590:1994, Cinematography - Audio records on
output level balance of several motion-picture
b)
70 mm motion-picture release prints with magnetic
projectors or systems and interchannel balance
stripes - Recorded characteristic.
on each projector or system (signal level test film;
see table 2);
ANSI S4.6:1982, Recorded flux of magnetic sound
records at medium wavelengths, methods of meas-
frequency response of the sound reproduction
d
uring.
channels (multi-frequency test film; see tables 3
and 4);
ANSI/IEEE 152:1992, Audio Program Level Measure-
ment.
non-uniformity in velocity of film travel (flutter)
d
(flutter test film; see table5).
CCIR Report 79-2:1994, Measurement of the charac-
teristics of sound signals recorded on magnetic tape.
DIN 45 520: 1973, Magnetic tape recorders; measure-
2 Normative references
ment of the absolute level of the magnetic flux and its
frequency response on magnetic tapes.
The following standards contain provisions which,
through reference in this text, constitute provisions
EBU Technical Document 3205-E, 1979, The EBU
of this International Standard. At the time of publi-
standard peak-programme meter for the control of
cation, the editions indicated were valid. All standards
in terna tional transmissions.
are subject to revision, and parties to agreements
based on this International Standard are encouraged
1) To be published. (Revision of IS0 266:1975)

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IS0 8395:1995(E)
IEC 386:1972, Method of measurement of speed
4 Specifications
fluctuations in sound recording and reproducing
equipment.
4.1 Test films shall be made on motion-picture film,
the cutting and perforating dimensions of which are
3 Types of test film
in accordance with IS0 3023. (See also annex A).
It is recognized that two different types of magnetic
test film are used for the evaluation and adjustment
of magnetic film reproducers. These test films differ
4.2 Location and width dimensions of sound
in the way their magnetic flux levels are measured,
records shall be in accordance with IS0 2404.
and in the detailed procedures of their application in
system evaluation and adjustment. In this Inter-
national Standard, both types of magnetic test film are
4.3 Magnetic recording characteristics for multifre-
specified, according to the following definitions.
quency test film shall be in accordance with
IS0 8590.
Type 185
a)
Magnetic flux levels are measured using the pro-
4.4 Test films shall be splice-free, except where
cedures specified in ANSI S4.6 and CCIR 79-2.
joins are an essential part of the test film.
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
4.5 70 mm test films shall be recorded at a film
films were developed for use generally in
velocity equivalent to 24 frames (120 perforations) per
countries with a mains frequency of 60 Hz, and
second [nominally 570 mm (22,4 in) per second]. All
for measurement with VU meters conforming to
frequency and velocity tolerances shall relate to this
ANSI/IEEE 152.
stated velocity.
NOTE 1 The method for measuring magnetic flux
level given in ANSI S4.6 uses a special reproducing
4.6 Each test film shall be provided with written
head with two symmetrical gaps. The magnetic film to
be measured is run in contact with the front gap and identification on the outside of the container, including
then in contact with the rear gap. The flux is calculated
the following information:
from the two EMF values and the head data.
- type of test film (Type 185 or Type 320),
Type 320
b)
- function of the film,
Magnetic flux levels are measured using the pro-
cedures specified in DIN 45 520. The reference
- base material (triacetate or polyester),
short-circuit flux level shall be 320 nWb/m. The
test film signal output level shall be 10 dB below
- date and place of recording, and
the reference flux level. These test films were
developed for use generally in countries with a
- a statement that the test film conforms to this
mains frequency of 50 Hz, and for measurement
International Standard.
with SPP meters conforming to EBU Technical
Document 3205-E.
4.7 Within multifrequency test films, each fre-
NOTE 2 The method for measuring magnetic flux
quency shall be identified by voice announcements
level given in DIN 45 520 uses a search coil to sense
preceding that frequency segment. The peak level of
the flux of a very long wavelength recording. The re-
voice announcements shall not exceed the peak level
cording head is then fed with the same current, but at
of modulation.
the reference frequency to produce a recording for cal-
ibrating a high-efficiency reproducing head.
TI
I ne calibration of a magnetic film reproducer resulting 4.8 If multi-track test films are made on a fully
from the use of a Type 320 magnetic test film will magnetic coated motion-picture film, the individual
differ from that obtained from the use of a Type 185 records shall be made in accordance with this Inter-
magnetic test film, and will generally give a result national Standard, including the specific
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