1、BRITISH STANDARD BS ISO 12611:2004 Cinematography Audio head tones for use in international exchange of 35 mm analogue magnetic film masters Specifications and location ICS 37.060.20 BS ISO 12611:2004 This British Standard was published under the authority of the Standards Policy and Strategy Commit
2、tee on 28 June 2004 BSI 28 June 2004 ISBN 0 580 43991 7 National foreword This British Standard reproduces verbatim ISO 12611:2004 and implements it as the UK national standard. It supersedes BS ISO 12611:1997 which is withdrawn. The UK participation in its preparation was entrusted to Technical Com
3、mittee CPW/36, Cinematography, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Ca
4、talogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its
5、correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests
6、 informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1 to 3 and a back cover. The BSI copyright notice displayed in th
7、is document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 12611:2004(E) OSI 4002INTERNATIONAL STANDARD ISO 12611 Second edition 2004-06-01 Cinematography Audio head tones for use in international exchange of 35 mm analogu
8、e magnetic film masters Specifications and location Cinmatographie Audio head tones pour utilisation dans les changes internationaux de masters de film magntique analogiques de 35 mm Spcifications et emplacement BSISO12611:2004IS:11621 O4002(E) DPlcsid Fremia ihTs PDF file may ctnoian emdebt dedyfep
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11、izde for irpnti.gn Evyre caer neeb sah taken to sneeru that the file is suitlbae fosu re yb ISO memdob rebeis. In tlnu ehikletneve y ttah lborp aem leratit gno it is f,dnuo plsaee inform ttneC ehlar Secrteiraat ta the serddaig sleb nevwo. ISO 4002 All irthgs erse.devr lnUeto sswrehise specified, on
12、trap fo this lbupictaion maeb y cudorperro de tuilizi den yna form ro na ybm ynae,s lecetrinoc ro mecinahcal, inclidung tohpcoiypodna gn micrfoilm, wittuoh repmissii non writign from ietI rehSa Ot tsserdda eh ebolw or ISOs memreb i ydobn the cnuotrfo y ttseuqer ehe.r ISO cirypothg fofice saCe tsopal
13、e 65 eneG 1121-HC 02 av leT. 4 + 10 947 22 1 11 xaF0 947 22 14 + 9 74 E-mail coirypthgiso.o gr We bwww.is.o gro Pulbisdehi n Switlrez dnaii ISO 4002 Allr ithgsr esedevrBSISO12611:2004IS:11621 O4002(E) I SO 4002 All irthgs ersedevr iiiForeword ISO (the International Organization for Standardization)
14、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. Each member body interested in a subject for which a technical committee has been established has the right to be repres
15、ented on that committee. International 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
16、drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International
17、 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 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 12611 was prepa
18、red by Technical Committee ISO/TC 36, Cinematography. This second edition cancels and replaces the first edition (ISO 12611:1997), of which it constitutes a minor revision. BSISO12611:2004blank 4002:11621OSISBINTENRATIONAL TSANDADR IS:11621 O4002(E)I SO 4002 All irthgs ersedevr 1Cinematography Audio
19、 head tones for use in international exchange of 35 mm analogue magnetic film masters Specifications and location 1 Scope This International Standard specifies head-leader tones for use on interchanged motion-picture analogue audio masters, from two track (on three-track format records) through six
20、track. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 266:1997, Acous
21、tics Preferred frequencies ISO 4834:1997, Cinematography Magnetic sound test films excluding striped release prints Basic technical characteristics AES7-2000, AES standard for the presevation and restoration of audio recording Method of measuring recorded fluxivity of magnetic sound records at mediu
22、m wavelengths 1)DIN 45520:1973, Magnetic tape recorders; measurement of the absolute level of the magnetic flux and its frequency response on magnetic tapes 3 Leader 3.1 The first test section of leader shall be a 1 kHz sine wave signal recorded at a flux of 185 nWb/m as measured according to AES7.
23、The tone shall be recorded simultaneously and in phase on all channels of the master, for a duration of 10 s for two-channel masters on three-track format records, 20 s for three- and four- track masters, and 30 s for six-track masters. NOTE The reference level of 185 nWb/m does not preclude the use
24、 of calibration films made according to DIN 45520 from being used for the alignment of recorders and reproducers. 3.2 For two-channel masters recorded on the three-track format only, the second section of leader shall identify the channels audibly by sequencing, in time, one beep on the left channel
25、 and two beeps on the right channel. 1) Revision of AES7-1982. Published by Audio Engineering Society, Inc. BSISO12611:2004IS:11621 O4002(E) 2 I SO 4002 All irthgs ersedevr3.3 The third section of leader shall be pink-noise recorded simultaneously and in phase on all the channels of the master for a
26、 duration of 30 s. The recorded level shall be such as to prevent saturation effects, such as 10 dB at a reference level of 185 nWb/m. The level in each one-third octave band from 40 Hz to 16 kHz shall be the same, within the limits given in ISO 266. NOTE The objective of using a pink-noise test sig
27、nal for this section is to have a reference signal with equal energy in equal logarithmic frequency intervals within the audio bandwidth. 3.4 If companding noise reduction systems are in use, the fourth section of leader shall be the test signal generated by the noise reduction system for its refere
28、nce level, for a duration of 10 s for two-channel masters on three-track format, 20 s for three- and four-track masters, and 30 s for six-track masters. NOTE Such signals generally have audible identifying characteristics to identify the type of noise reduction. 3.5 Head-leader tones shall be record
29、ed on each roll of audio masters, and written information on track location shall be printed on the outside of each container. BSISO12611:2004IS:11621 O4002(E) I SO 4002 All irthgs ersedevr 3Annex A (informative) Use of the test signals A.1 Purpose The purpose of this annex is to describe the usage
30、of test signals which are specified in this International Standard, as well as practical limitations to their usage. A.2 Uses of the reference level tone Subclauses A.2.1 and A.2.2 detail adjustments which are interactive and which may have to be performed more than once to optimize the various adju
31、stments. A.2.1 The reference level tone may be used for setting the preliminary head-mounting adjustments such as coarse rotation, azimuth, zenith and height by setting the appropriate mechanical adjustments for the highest and most level-stable output. A.2.2 An X-Y display of the reference tone on
32、an oscilloscope may be used for coarse azimuth setting using the following method. Connect the X and Y inputs of an oscilloscope to the signals from the preamplifier outputs of the two channels corresponding to the two tracks in use which are physically most widely separated on the format being used
33、. With the sensitivity of the preamplifier channels set to play the reference tone at the oscilloscope connection point at equal voltages, and the sensitivity of the X and Y oscilloscope channels made equal, adjust the azimuth for a 45 diagonal line on the oscilloscope, not an ellipse. A.2.3 The ref
34、erence level tone may also be used as a relative channel polarity test by using an X-Y display to check that each of the preamplifier outputs corresponding to the records, compared to a reference channel output, have the same slope, not the opposite slope, which would indicate a polarity reversal in
35、 the head or preamplifier wiring. A.3 Uses of pink noise A.3.1 The pink noise can be used to obtain the best overall azimuth by observing a Lissajous pattern on an oscilloscope with the X and Y axes connected to the signals from the two channels: when the reproducer sensitivity and equalization have
36、 been set for equal performance in the channels, and the azimuth is correct, a line will be displayed at a 45 angle, not a fuzzy ellipse. Pink noise has an advantage over sine wave tones for azimuth adjustment, as it produces unambiguous results (i.e. cannot be misajusted by one full cycle). A.3.2 I
37、n addition, pink noise can be used with a constant-percentage-bandwidth spectrum analyser, such as a one-third-octave band analyser, to set equalization adjustments. BSISO12611:2004BS ISO 12611:2004 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent nat
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