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1、BRITISH STANDARD BS EN 61120-2:1994 IEC 1120-2: 1991 Digital audio tape recorder reel to reel system, using 6.3 mm magnetic tape, for professional use Part 2: Format A The European Standard EN 61120-2:1993 has the status of a British Standard UDC 621.396.7:681.84.083.84:681.327.636 Licensed Copy: sh
2、effieldun sheffieldun, na, Sat Nov 11 09:10:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61120-2:1994 This British Standard, having been prepared under the direction of the Electronic Equipment Standards Policy Committee, was published under the authority of the Standards Board and comes into
3、 effect on 15 January 1994 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference EEL/22 Draft for comment 89/21780 DC ISBN 0 580 22695 6 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervisio
4、n this European Standard was prepared, comprises the national committees of the following countries: AustriaItaly BelgiumLuxembourg DenmarkNetherlands FinlandNorway FrancePortugal GermanySpain GreeceSweden IcelandSwitzerland IrelandUnited Kingdom Amendments issued since publication Amd. No.DateComme
5、nts Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:10:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61120-2:1994 BSI 01-2000i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 Text of EN 61120-23 National annex NA (informative) Committees respon
6、sibleInside back cover National annex NB (informative) Cross-referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:10:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61120-2:1994 ii BSI 01-2000 National foreword This British Standard has been prepared under the di
7、rection of the Electronic Equipment Standards Policy Committee and is the English language version of EN 61120-2:1993 Digital audio tape recorder reel to reel system, using 6,3 mm magnetic tape, for professional use, Part 2: Format A, published by the European Committee for Electrotechnical Standard
8、ization (CENELEC). It is identical with IEC 1120-2:1991, published by the International Electrotechnical Commission (IEC). BS EN 61120 consists of the following Parts. Part 1: General requirements; Part 2: Format A; Part 3: Format B; Part 4: Magnetic tape properties: definitions and methods of measu
9、rement; Part 5: Reels for 6.3 mm digital audio tape1). Additional information. IEC 1120-4 stated in 1.5.1 and 1.5.3 as being “(under consideration)” was published in 1992, and was implemented as BS EN 61120-4:1993. A British Standard does not purport to include all the necessary provisions of a cont
10、ract. 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, the EN title page, pages 2 to 1
11、8, 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 inside front cover. 1) In preparation. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:10:19 GMT+00:0
12、0 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61120-2 October 1993 UDC 621.396.7:681.84.083.84:681.327.636 Descriptors: Audio recording, digital recording, magnetic tape, data converter, code, format, recording characteristics, recording track English versio
13、n Digital audio tape recorder reel to reel system, using 6,3 mm magnetic tape, for professional use Part 2: Format A (IEC 1120-2:1991) Systme denregistrement bande audionumrique, bobine bobine, utilisant une bande magntique de 6,3 mm, usage professionnel Partie 2: Format A (CEI 1120-2:1991) Digitale
14、s Tonbandgert Spulensystem mit Magnetband 6,3 mm fr Studioanwendungen Teil 2: Format A (IEC 1120-2:1991) This European Standard was approved by CENELEC on 1993-09-22. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
15、 Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English
16、, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Bel
17、gium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr E
18、lektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1993 Copyright reserved to CENELEC members Ref. No. EN 61120-2:1993 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:10:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61120-2:1993 BSI 01-2000 2 Foreword Th
19、e CENELEC questionnaire procedure, performed for finding out whether or not the International Standard IEC 1120-2:1991 could be accepted without textual changes, has shown that no common modifications were necessary for the acceptance as a European Standard. The reference document was submitted to t
20、he CENELEC members for formal vote and was approved by CENELEC as EN 61120-2 on 22 September 1993. The following dates were fixed: For products which have complied with the relevant national standard before 1994-09-01, as shown by the manufacturer or by a certification body, this previous standard m
21、ay continue to apply for production until 1999-09-01. Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Contents Page Foreword2 1Main track recording3 1.1Recording modulation method3 1.2Signal block structure3 1.2.1The word format3 1.2.2The
22、 block structure4 1.2.3Synchronization pattern4 1.3Signal word distribution to tracks5 1.4Error protection method5 1.4.1The error correction code5 1.4.1.1 C2 Encoder7 1.4.1.2 C1 encoder9 1.4.2Interleave sequence9 1.5Recording and reproducing characteristics14 1.5.1Reference tape14 1.5.2Calibration t
23、apes14 1.5.3Procedure for adjusting recording current level and waveform14 Page 1.5.4Specifications of tolerance relative to calibration tape14 2Sub-track recording14 2.1Digital recording method14 2.1.1Recording method on sub-track 214 2.2Alignment of digital audio signals and sub-track signals14 2.
24、2.1Alignment of cue audio-1 and cue audio-2 track signal14 2.2.2Alignment of time code track signal14 3Control word15 3.1Control word configuration15 3.2Control data assignment15 3.3Block address16 3.4C3 Encoder17 Annex ZA (normative) Other international publications quoted in this standard with the
25、 references of the relevant European publications18 Figure 1 Symbol and word structure (speed I)8 Figure 2 Symbol and word structure (speed II)10 Figure 3 C2 Encoder and interleave sequence11 Figure 4 Example of data arrangement (speed I)12 Figure 5 Example of data arrangement (speed II)12 Figure 6
26、Interleave map on the tape (speed I)13 Figure 7 Interleave map on the tape (speed II)13 latest date of publication of an identical national standard(dop) 1994-09-01 latest date of withdrawal of conflicting national standards(dow) 1994-09-01 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:1
27、0:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61120-2:1993 BSI 01-20003 Electrical requirements for recording and reproducing equipment. 1 Main track recording 1.1 Recording modulation method In this subclause a method is first defined to convert binary data sequence of each of the 8 main digit
28、al tracks for recording on the magnetic tape. The second item described in 1.2.3, is the definition of the synchronization pattern in recording code. The converted code is given by NRZI. The 2/4 M system is defined by dividing a binary data sequence into two-bit data segments and converting these in
29、to four-cell codes using the data of the four bits preceding and the four bits succeeding the two-bit data segment. The system uses the collected data to convert the two-bit data segments into four-cell codes ensuring that no less than two and no more than seven code cells “0” exist between any code
30、 cells “1” in a sequence of converted code. The conversion rule is given by the following table. 2/4 M conversion table The converted code is given by NRZI. 1.2 Signal block structure 1.2.1 The word format The word slots to be recorded on the main tracks have 20 bits at speed I and 16 bits at speed
31、II. PCM samples are specified as uniformly quantified and are represented in the form of sign bit (MSB) leading. Original data bits Converted code cells Contents 11Y000 Unconditional 010010 10 10 10 10 10 0100 0001 0000 0100 Y001 “E2E1” s “10” and “L1L2” = “00” “E2E1” = “10” and “L1L2” = “00” “E2E1”
32、 = “10”, “L1 L2” = “10” and “L3 L4” = “00” “E2E1” s “10”, “L1 L2” = “10” and “L3 L4” = “00” Except the foregoing 00 00 00 00 0000 0001 0000 0100 “E4 E3” s, “10”, “E2 E1” = “10” and “L1 L2” s 01” “E4 E3” s , “10”, “E2 E1” = “10” and “L1 L2” = “01” “E4 E3” = “10” and “E2 E1” = “10” Except the foregoin
33、g where: En= data bits preceded by n-bit, to 2-bit data to be converted in original data sequence Ln= data bits succeeded by n-bit, to 2-bit data to be converted in original data sequence Y= complement logic of logical sum of two cells immediately before code bit Y in the converted code sequence Lic
34、ensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:10:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61120-2:1993 4 BSI 01-2000 1.2.2 The block structure The following figure shows the data configuration and the contents of frames and blocks. Legend: Frame and block parameters: 1.2.3 Synchroni
35、zation pattern The synchronization pattern in recording code consists of 32 cells, in which the magnetization reversion interval is confined within the rule of 2/4 M scheme, so as to protect the overwrite characteristics from deterioration, and a pattern of lower cross correlation function is chosen
36、 so as to let the probability of erroneous SYNC detection be reduced at the vicinity of SYNC signal. The synchronization pattern is represented in NRZI, and given as follows. 00100001000100001001001000100000 recording direction BA =Bloc address ID=Identification data SYNC lengthp=16bits Control word
37、 or C3 lengthcw =8bits Data or C2 lengthd=320bits C1 (CRC) lengthc=16bits Frame lengthf=360bits Block configurationb=8frames Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:10:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61120-2:1993 BSI 01-20005 1.3 Signal word distribution to tracks
38、Input PCM samples of two audio channels are allocated for six tracks by a matrix device and additionally two tracks of C2-check data are encoded in the way described in the following figure: 1.4 Error protection method Error protection method is two dimensional. Error detection is made possible by t
39、he CRC check word recorded for each frame of each track, and by the Reed-Solomon code. Error correction is made possibly by the Reed-Solomon code with the aid of CRC check results. 1.4.1 The error correction code The error correction code referred to as the RSC code shall be used. The RSC code is a
40、sub-class of the generalized product code. The code is constructed by the (16,12,5) Reed-Solomon code over GF (28), as code C2, and by the (344,328,4) CRC over GF(2), as code C1. Symbol interleaving has been performed between C2 encoding and C1 encoding. Generator polynomials for code C2, and code C
41、1 are given by the following equations: G1 (x) is the generator polynominal based on CCITT V41 recommended 16-bit Cyclic Redundancy Check (CRC) word: ! is the primitive element of GF (28). The vector representation of ! is and the primitive polynomial g(x) is g (x) = x8+ x4+ x3+ x2+ 1 All elements a
42、re shown in the following table: ! = (00000010) !7!6!5!4!3!2!1!0 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:10:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61120-2:1993 6 BSI 01-2000 The element over gf (28) NumberElementNumberElementNumberElementNumberElement 0 1 2 3 4 5 6 7 8 9
43、10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 00000001 00000010 00000100 00001000 00010000 00100000 01000000 10000000 00011101 00111010 01110100 11101000 11001101 10000111 00010011 001
44、00110 01001100 10011000 00101101 01011010 10110100 01110101 11101010 11001001 10001111 00000011 00000110 00001100 00011000 00110000 01100000 11000000 10011101 00100111 01001110 10011100 00100101 01001010 10010100 00110101 01101010 11010100 10110101 01110111 11101110 11000001 10011111 00100011 010001
45、10 10001100 00000101 00001010 00010100 00101000 01010000 10100000 01011101 10111010 01101001 11010010 10111001 01101111 11011110 10100001 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 11
46、3 114 115 116 117 118 119 120 121 122 123 124 125 126 127 01011111 10111110 01100001 11000010 10011001 00101111 01011110 10111100 01100101 11001010 10001001 00001111 00011110 00111100 01111000 11110000 11111101 11100111 11010011 10111011 01101011 11010110 10110001 01111111 11111110 11100001 11011111
47、 10100011 01011011 10110110 01110001 11100010 11011001 10101111 01000011 10000110 00010001 00100010 01000100 10001000 00001101 00011010 00110100 01101000 11010000 10111101 01100111 11001110 10000001 00011111 00111110 01111100 11111000 11101101 11000111 10010011 00111011 01110110 11101100 11000101 10
48、010111 00110011 01100110 11001100 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 10000101 0
49、0010111 00101110 010111100 10111000 01101101 11011010 10101001 01001111 10011110 00100001 01000010 10000100 00010101 00101010 01010100 10101000 01001101 10011010 00101001 01010010 10100100 01010101 10101010 01001001 10010010 00111001 01110010 11100100 11010101 10110111 01110011 11100110 11010001 10111111 01100011 11000110 10010001 00111111 01111110 11111100 11100101 11010111 10110011 01111011 11110110 11110001 11111111 11100011 11011011 10101011 01001011 10010110 00110001 01100010 11000100 10010101 00110111 011