1、BRITISH STANDARD BS EN 61595-1:1997 IEC 61595-1: 1997 Multichannel digital audio tape recorder (DATR), reel-to-reel system, for professional use Part 1: Format A The European Standard EN61595-1:1997 has the status of a British Standard ICS 33.160.30BSEN61595-1:1997 This British Standard, having been
2、 prepared under the directionof the Electrotechnical Sector Board,was published undertheauthority of the Standards Board and comes intoeffect on 15October1997 BSI 03-2000 ISBN 0 580 28425 5 National foreword This British Standard is the English language version of EN61595-1:1997. Itis identical with
3、 IEC61595-1:1997. The UK participation in its preparation was entrusted by Technical Committee EPL/100, Audio, video and multimedia systems and equipment, to Subcommittee EPL/100/2, Recording, which has the responsibility to: aid enquirers to understand the text; present to the responsible internati
4、onal/European committee any enquiries on the interpretation, or proposals for change, and keep the UKinterests informed; monitor related international and European developments and promulgate them in the UK. IEC61595 will comprise the following parts: Part 1: Format A; Part 2: Format B; Part 3: 24 b
5、it operation for 16 bit media. A list of organizations represented on this subcommittee can be obtained on request to its secretary. From1January1997, all IEC publications have the number60000 added to the old number. For instance, IEC27-1 has been renumbered as IEC60027-1. For a period of time duri
6、ng the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corres
7、ponding European publications. The British Standards which implement international 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 Stan
8、dards Electronic Catalogue. A British 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 pa
9、ges This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 26, an inside back cover 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
10、 inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN61595-1:1997 BSI 03-2000 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 61595-1 5ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61595-1 August 1997 ICS 33.160.30 Descriptors:
11、Sound recording, digital recording, magnetic tapes, recording tracks, codification, mechanical properties, electrical properties, recording characteristics, interchangeability Englishversion Multichannel digital audio tape recorder (DATR), reel-to-reel system, for professional use Part 1: Format A (
12、IEC 61595-1:1997) Systme denregistrement bande audionumrique multivoie (DATR), bobine bobine, usage professionnel Partie 1: Format A (CEI 61595-1:1997) Digitales Mehrkanal-Tonbandgert (DATR), Spulensystem fr Studioanwendugen Teil 1: Format A (IEC61595-1:1997) This European Standard was approved by C
13、ENELEC on1997-07-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national stand
14、ards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and noti
15、fied to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland an
16、d United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1997 CENELEC All rights of exploitation in any form and by any m
17、eans reserved worldwide for CENELEC members. Ref. No. EN 61595-1:1997 EEN61595-1:1997 BSI 03-2000 2 Foreword The text of document100B/48/FDIS, future edition1 of IEC61595-1, prepared by SC100B, Recording, of IEC TC100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENEL
18、EC parallel vote and was approved by CENELEC as EN61595-1 on1997-07-01. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given for information only. In this standard, Annex ZA is normative and Annex A is informa
19、tive. Annex ZA has been added byCENELEC. Endorsement notice The text of the International Standard IEC61595-1:1997 was approved by CENELEC asaEuropean Standard without any modification. In the official version, forAnnex A, Bibliography, the following notes have to be added for the standards indicate
20、d: latest date by which the ENhas to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1998-04-01 latest date by which the national standards conflicting with the ENhaveto be withdrawn (dow) 1998-04-01 IEC 60094 NOTEHarmonized as EN60094 and HD
21、311 series (not modified). IEC 60268-12 NOTEHarmonized, together with its amendment 1:1991, as EN60268-12:1995 (not modified). IEC 60958 NOTEHarmonized as EN60958:1990 (not modified). IEC 61120-1 NOTEHarmonized as EN61120-1:1993 (not modified). IEC 61120-2 NOTEHarmonized as EN61120-2:1993 (not modif
22、ied). IEC 61120-3 NOTEHarmonized as EN61120-3:1993 (not modified). IEC 61120-5 NOTEHarmonized as EN61120-5:1995 (not modified).EN61595-1:1997 BSI 03-2000 3 Contents Page Foreword 2 1 Scope 5 2 Normative references 5 3 Definitions 5 3.1 Data flow of a digital audio tape recorder 5 4 Digital encoding
23、6 4.1 Sampling frequency 6 4.2 Sampling timing 6 4.3 Quantization 6 5 Tape speed 6 6 Tape width and number of digital audio channels 7 7 Tape winding 7 8 Reel and hub 7 9 Allocation and dimension of magnetic tracks 7 10 Assignment of magnetic tracks 7 11 Emphasis 11 12 Main track recording 12 12.1 R
24、ecording modulation method 12 12.2 Signal block structure 13 12.2.1 The word format 13 12.2.2 The frame and block structure 13 12.2.3 Synchronization pattern 13 12.3 Signal word distribution to tracks 14 12.4 Error protection method 15 12.4.1 The error correction code 15 12.4.2 Interleave sequence 1
25、7 12.5 Recording and reproducing characteristics 24 12.5.1 Reference tape 24 13 Subtrack recording 24 13.1 Auxiliary channels 24 13.1.1 Time code channel (time code track) 24 13.1.2 Auxiliary data channel (auxiliary data track) 24 13.1.3 Auxiliary analogue channels (cue audio-1 track and cue audio-2
26、 track) 24 13.2 Alignment of digital audio signals and subtrack signals 24 13.2.1 Alignment of cue audio-1 and cue audio-2 track signals 24 13.2.2 Alignment of time code track signals 24 Page Annex A (informative) Bibliography 25 Annex ZA (normative) Normative references to international publication
27、s with their corresponding European publications Inside back cover Figure 1 Recording channels of a DATR (digital audio tape recorder) 5 Figure 2 Data flow of the main audio channels of a DATR (digital audio tape recorder) 6 Figure 3 Reproducing channels of a DATR (digital audio tape recorder) 6 Fig
28、ure 4 Track pattern for DATR on magnetic tape (24 tracks with 12,7 mm tape width) 8 Figure 5 Track pattern for DATR on magnetic tape (47 tracks with 12,7 mm tape width) 9 Figure 6 Track pattern for DATR on magnetic tape (45 tracks with 25,4 mm tape width) 10 Figure 7 Track pattern for DATR on magnet
29、ic tape (89 tracks with 25,4 mm tape width) 11 Figure 8 Emphasis characteristics 12 Figure 9 Frame and block structure 13 Figure 10 Synchronization pattern 13 Figure 11 Signal word distribution to tracks 14 Figure 12 Symbol and word structure 16 Figure 13 Example of input data V 1 17 Figure 14 Main-
30、frame interleave (tape speed I) 18 Figure 15 Main-frame interleave (tape speed II) 19 Figure 16 Code interleave 20 Table 1 Tape width and number of digital audio channels 7 Table 2 Track assignment 7 Table 3 4/6M conversion table 12 Table 4 Track interleave (20 main tracks with 12,7 mm tape width) 2
31、0 Table 5 Track interleave (40 main tracks with 12,7 mm tape width) 21 Table 6 Track interleave (40 main tracks with 25,4 mm tape width) 22 Table 7 Track interleave (80 main tracks with 25,4 mm tape width) 234 blankEN61595-1:1997 BSI 03-2000 5 1 Scope This part of IEC61595 applies to8 to64 channel d
32、igital audio recording on12,7mm or25,4mm wide tape(hereafter called tape), with stationary heads, for professional use. It defines the mechanical and electrical characteristics necessary to ensure the interchangeability of programmes, recorded as digital audio signals on magnetic tape in professiona
33、l industries. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC61595. At the time of publication, the editions indicated were valid. Allnormative documents are subject to revision, and parties
34、to agreements based on this part of IEC61595 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 60461:1986, Time and control code for
35、video tape recorders. IEC 61120-4:1992, Digital audio tape recorder reel-to-reel system, using6,3mm magnetic tape, for professional use Part 4: Magnetic tape properties: definitions and methods of measurement. ITU-T V.41:1988, Code-independent error-control system. 3 Definitions For the purpose of t
36、his part of IEC61595, the following definitions apply. 3.1 data flow of a digital audio tape recorder Figure 1 shows, within a block diagram, the main data flow of a DATR (digital audio tape recorder) Figure 2 shows the recording channels of a DATR Figure 3 shows the reproducing channels of a DATR F
37、igure 1 Recording channels of a DATR (digital audio tape recorder)EN61595-1:1997 6 BSI 03-2000 4 Digital encoding 4.1 Sampling frequency The sampling frequency shall be48kHz, and the accuracy of the sampling frequency at encoding shall be 50 10 6 . 4.2 Sampling timing It is recommended that all chan
38、nels are sampled simultaneously. 4.3 Quantization Each audio sample shall be quantized uniformly and be expressed in16bits, 2s complement code. Positive numbers correspond to positive analogue voltages at the input. 5 Tape speed The tape speed shall be nominal76,20cm/s (hereafter called speed I) and
39、38,10cm/s (hereafter called speed II). The tolerance on tape speeds shall be within0,2%. Figure 2 Data flow of the main audio channels of a DATR (digital audio tape recorder) Figure 3 Reproducing channels of a DATR (digital audio tape recorder)EN61595-1:1997 BSI 03-2000 7 6 Tape width and number of
40、digital audio channels The tape width shall be25,37mm (nominal25,4mm) or12,66mm (nominal12,7mm). Table 1 shows tape width and number of digital audio channels. Table 1 Tape width and number of digital audio channels 7 Tape winding The magnetic coating faces the centre of the reel. 8 Reel and hub Und
41、er consideration. 9 Allocation and dimension of magnetic tracks TheFigure 4, Figure 5, Figure 6 andFigure 7 show the track allocations on magnetic tape. 10 Assignment of magnetic tracks If the tape moves from the left to right with the magnetic coating facing away from the observer and with the lead
42、er to the right, the bottom track is designated track1, the next upper track is designated track2 and so on. Table 2 shows the assignment of magnetic tracks. Table 2 Track assignment Items Contents Tape width (mm) 25,4 12,7 Number of audio channels 64 32 16 32 16 8 Main 80 40 40 40 40 20 Number of t
43、racks Sub 9 5 5 7 7 4 Total 89 45 45 47 47 24 Main tracks/audio channels 10/8 10/8 10/4 10/8 10/8 10/4 Tape speed I I II I I II Track number Tape width (mm) 25,4 12,7 Main Digital audio 483 342 443 322 Time code 3 2 3 2 Type of track Cue audio-1 85 43 1 1 Sub Cue audio-2 87 44 47 24 Auxiliary data 1
44、, 2, 84, 86, 88, 89 1,45 2, 44, 45, 46 23 0 0,03 0 0,02EN61595-1:1997 8 BSI 03-2000 Figure 4 Track pattern for DATR on magnetic tape (24 tracks with 12,7 mm tape width)EN61595-1:1997 BSI 03-2000 9 Figure 5 Track pattern for DATR on magnetic tape (47 tracks with 12,7 mm tape width)EN61595-1:1997 10 B
45、SI 03-2000 Figure 6 Track pattern for DATR on magnetic tape (45 tracks with 25,4 mm tape width)EN61595-1:1997 BSI 03-2000 11 11 Emphasis In general, the use of emphasis is not recommended. If pre-emphasis is applied, the emphasis shall be used with the characteristics of a first order pre-emphasis,
46、as shown inFigure 8. Figure 7 Track pattern for DATR on magnetic tape (89 tracks with 25,4 mm tape width)EN61595-1:1997 12 BSI 03-2000 12 Main track recording 12.1 Recording modulation method In this subclause, the method is first defined to convert a binary data sequence of each of the main digital
47、 tracks for recording on the magnetic tape. The second item, described in12.2.3, is the definition of the synchronization pattern in recording code. The converted code is given by NRZI. The4/6M system shall be used as recording modulation method. The4/6M system is defined by dividing a binary data s
48、equence into4-bit or6-bit data segments and converting these into six-cell or nine-cell codes respectively. This system ensures no less than one and no more than six code cells “0” exist between any code cells “1” in a sequence of converted code. The conversion rule is given byTable 3. Table 3 4/6M
49、conversion table where X is complement logic of the code cell immediately before code bit X in the converted code sequence. Figure 8 Emphasis characteristics Original data bits Converted code cells Original data bits Converted code cells 0000 010000 0100 010010 000100 X00010001 0101 X00100 000101 X00100001 0110 010100 000110 X01000001 0111 X01000 000111 X01010001 1000 X01001 001000 010000001 1001 010001 001001 010010001 1010 X00010 001010 010100001 1011 X0
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