BS ISO 8622-1998 Cinematography - Magnetic sound records on 70 mm motion-picture release prints with magnetic stripes - A-chain reproduction characteristics《电影技术 磁带声迹70mm电.pdf

1、BRITISH STANDARD BS ISO 8622:1998 Cinematography Magnetic sound recordson 70mm motion-picture release prints with magnetic stripes A-chain reproduction characteristics ICS 37.060.20BSISO8622:1998 This British Standard, having been prepared under the directionof the Consumer Products and Services Sec

2、tor Board, was published under theauthority of the Standards Board and comes into effect on 15June 1998 BSI 04-1999 ISBN 0 580 29887 6 National foreword This British Standard reproduces verbatim ISO 8622:1998 and implements it as the UK national standard. It supersedes BS 5550-4.4.2:1992 which is wi

3、thdrawn. 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 enquiries on the interpretation, or proposals for chang

4、e, 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 British Standards which implement international or Eur

5、opean 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 British Standard does not purport to include all the nec

6、essary 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 front cover, an inside front cover, pages i and ii, theI

7、SO title page, page ii, pages 1 to 6 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 the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSISO8622:1998 BSI 0

8、4-1999 i Contents Page National foreword Insidefrontcover Foreword ii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Method of measurement 1 5 Characteristics 2 Annex A(normative) Overall “A + B” figures 5 Figure 1 Complete theatrical sound reproducing system 3 Figure 2 Type II sound track ove

9、r curve N B-chain 3 Figure 3 Type II sound track over curve X B-chain 4 Figure 4 Type III sound track over curve X B-chain 4 Figure A.1 “A+ B” response for type II sound track 6 Figure A.2 “A+ B” response for type III sound track 6 Table 1 A-chain frequency response for reproduction of 70mm magnetic

10、 striped sound records 2 Table A.1 Overall electro-acoustic characteristics 5ii blankBSISO8622:1998 ii BSI 04-1999 Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standar

11、ds 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

12、 part in the work. ISO collaborates closely with the International 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 S

13、tandard requires approval by at least 75% of the member bodies casting a vote. International Standard ISO 8622 was prepared by Technical Committee ISO/TC 36, Cinematography. This second edition cancels and replaces the first edition (ISO 8622:1990), clause2 and subclause 3.5 (note 2 added) of which

14、have been technically revised. Annex A forms an integral part of this International Standard. Descriptors: Cinematography, motion-picture film, motion-picture film 70 mm, sound recording, magnetic recording, sound reproduction, characteristics, frequency responses.BSISO8622:1998 BSI 04-1999 1 1 Scop

15、e This International Standard specifies the A-chain electrical frequency response characteristics for magnetic sound reproduction in motion-picture control rooms and indoor theatres. It is also intended for use, in conjunction with ISO 2969, in the standardization of recording monitor and reproducti

16、on characteristics of motion-picture sound in studio dubbing theatres, review rooms and indoor theatres. This International Standard covers that part of the motion-picture sound system from the transducer to the input terminals of the main fader, and should be read in conjunction with ISO 8590, whic

17、h defines the recorded characteristics for 35mm and 70mm magnetic striped prints. 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 val

18、id. All standards 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 St

19、andards. ISO 2969:1987, Cinematography B-chain electro-acoustic response of motion-picture control rooms and indoor theatres Specifications and measurements. ISO8395:1995, Cinematography Test films for the reproduction of 70mm motion-picture release prints with magnetic stripes Specifications. ISO 8

20、590:1994, Cinematography Audio records on 70mm motion-picture release prints with magnetic stripes Recorded characteristic. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 complete sound reproduction system a system used for the playback of motion-

21、picture records (see Figure 1) in dubbing theatres, review rooms, and indoor theatres; by convention it consists of an “A-chain and a B-chain” 3.2 type I sound track a sound record with a characteristic normally only used with monophonic photographic motion-picture prints 3.3 type II sound track a s

22、ound record which is intended for playback over a theatre B-chain system aligned to curve N of ISO2969 3.4 type III sound track a monophonic or stereophonic magnetic or photographic sound record which is intended for playback over a theatre B-chain system aligned to curve X of ISO 2969 a type III so

23、und track will normally require decoding with a suitable electronic noise reduction system 3.5 A-chain (transducer system) the “A” part of a motion-picture sound system as shown in Figure 1, which extends from the transducer(s) to the input terminals of the main fader NOTE 1It is customary for the A

24、-chain to contain the necessary de-emphasis network for the playback of type II magnetic sound tracks when being reproduced over a B-chain aligned to curve X as defined in ISO 2969. The A-chain will also contain noise reduction decoding circuitry if required for the playback of type III sound tracks

25、. NOTE 2It has been shown that a low-frequency time constant of infinity should be used for best headroom versus frequency of the medium. It is recognized, however, that it is necessary for the immediate future to continue to add low frequency pre-emphasis of 3180 4s, because much theatre equipment

26、cannot meet the tolerances of this International Standard when using a time constant of infinity. 3.6 B-chain (final chain) the “B” part of a motion-picture sound system as shown in Figure 1, which extends from the input terminals of the main fader to the listening area of the room or auditorium NOT

27、ETwo B-chain characteristics are described in ISO 2969, identified as curve N and X. 3.7 electro-acoustic response the electro-acoustic response of the final chain at a given position is the sound pressure level expressed in decibels with respect to an arbitrary reference pressure over a given frequ

28、ency range 4 Method of measurement The frequency response of the A-chain shall be measured with a high impedance voltmeter accurate from 20Hz to 20kHz 1dB. The measurements shall be taken at the fader input terminals, or at an equivalent position, when a multifrequency test film conforming to ISO 83

29、95 is played on the reproducer.BSISO8622:1998 2 BSI 04-1999 5 Characteristics The measured frequency response shall conform within the quoted tolerances to the characteristics defined for type II and type III sound tracks in Table 1 and shown graphically in Figure 2, Figure 3 and Figure 4. 5.1 Figur

30、e 2 represents current practice for the playback of type II sound tracks over a curve N B-chain. 5.2 Figure 3 represents current practice for the playback of type II sound tracks over a curve X B-chain. 5.3 Figure 4 represents current practice for the playback of type III sound tracks over a curve X

31、 B-chain. 5.4 A type III magnetic sound track is not normally considered suitable for playback over a curve N B-chain. NOTEFor reference purposes, Table A.1 and Figure A.1 and Figure A.2 show the total “A + B” response for type II and type III sound tracks. 5.5 In multi-channel installations intende

32、d for stereophonic reproduction, the difference in electrical output between channels at 1 kHz shall not exceed 1dB. Table 1 A-chain frequency response for reproduction of 70mm magnetic striped soundrecords B-chain playback curve Type II sound track Type III sound track Curve N Curve X Curve X Toler

33、ance Frequency (Hz dB dB dB dB 31,5 40 63 0 0 0 10,0 8,0 3,0 0 0 0 2 2 2 125 160 250 0 0 0 0 0 0 0 0 0 1 1 1 400 1000 2500 0 0 0 0 0 0 0 0 0 1 1 1 4000 6300 8000 0 0 0 0 2,5 4,0 0 0 0 1 1 1 10 000 12 500 16 000* 0 0 0 7,0 9,0 11,0 0 0 0 1 + 1, 2 + 1, 3 NOTEThe frequencies defined in the table are th

34、ose listed in the minimum set for the multi-frequency test film described in ISO8395. The frequency identified with an asterisk (*) is specified as optional in ISO 8395.BSISO8622:1998 BSI 04-1999 3 Figure 1 Complete theatrical sound reproducing system Figure 2 Type II sound track over curve N B-chai

35、nBSISO8622:1998 4 BSI 04-1999 Figure 3 Type II sound track over curve X B-chain Figure 4 Type III sound track over curve X B-chainBSISO8622:1998 BSI 04-1999 5 Annex A (normative) Overall “A + B” figures A.1 For reference purposes only, Table A.1 and Figure A.1 and Figure A.2 show the overall “A + B”

36、 figures for the playback of types II and III magnetic sound tracks. A.2 The B-chain contribution to the combined “A + B” -chain responses in Table A.1 and in Figure A.1 and Figure A.2 requires measurement using techniques described in ISO 2969. Table A.1 Overall electro-acoustic characteristics Fre

37、quency Type II sound track Type III sound track Hz dB dB 31,5 a 40 50 b 14,0 10,0 6,0 4,0 2,0 1,0 63 80 b 100 b 3,0 0 0 0 0 0 125 160 200 b 0 0 0 0 0 0 250 315 b 400 0 0 0 0 0 0 500 b 630 b 800 b 0 0 0 0 0 0 1 000 1 250 b 1 600 b 0 0 0 0 0 0 2 000 b 2 500 3 150 b 0 1,0 2,0 0 1,0 2,0 4 000 5 000 b 6

38、300 3,0 5,0 8,0 3,0 4,0 5,0 8 000 10 000 12 500 11,0 14,0 18,0 6,0 7,0 8,0 16 000 a 22,0 9,0 a These frequencies are not included in ISO 2969, and the data have been extrapolated, with the B-chain characteristics derived in accordance with the procedure described in ISO2969. b These frequencies are

39、not included in the minimum set multifrequency test film described in ISO 8395, but are contained within the third octave set listed in ISO 2969.BSISO8622:1998 6 BSI 04-1999 Figure A.1 “A + B” response for type II sound track Figure A.2 “A + B” response for type III sound trackblankBS ISO 8622:1998

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