1、BRITISH STANDARD BS EN 61120-2:1994 IEC1120-2: 1991 Digital audio tape recorder reel to reel system, using6.3mm magnetic tape, for professional use Part 2: Format A The European Standard EN61120-2:1993 has the status of a BritishStandard UDC 621.396.7:681.84.083.84:681.327.636BSEN61120-2:1994 This B
2、ritishStandard, having been prepared under the directionof the Electronic Equipment Standards Policy Committee, was published underthe authority of the Standards Board andcomesintoeffect on 15January1994 BSI 01-2000 The following BSI references relate to the work on this standard: Committee referenc
3、e EEL/22 Draft for comment89/21780DC ISBN 0 580 22695 6 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national committees of the following countries: Austria Italy Belgium Lu
4、xembourg Denmark Netherlands Finland Norway France Portugal Germany Spain Greece Sweden Iceland Switzerland Ireland UnitedKingdom Amendments issued since publication Amd. No. Date CommentsBSEN61120-2:1994 BSI 01-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii F
5、oreword 2 Text of EN61120-2 3 National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN61120-2:1994 ii BSI 01-2000 National foreword This BritishStandard has been prepared under the direction of the Electronic Equi
6、pment Standards Policy Committee and is the English language version of EN61120-2:1993 Digital audio tape recorder reel to reel system, using6,3mm magnetic tape, for professional use, Part2: Format A, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical
7、 with IEC1120-2:1991, published by the International Electrotechnical Commission (IEC). BS EN61120 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 measurement; Part 5: Reels for6.3mm digit
8、al audio tape 1) . Additional information. IEC1120-4 stated in1.5.1 and1.5.3 as being “(underconsideration)” was published in1992, and was implemented as BSEN61120-4:1993. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are respon
9、sible 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, pagesi andii, theEN title page, pages2 to18, an inside back cover and a back cover. This s
10、tandard 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.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61120-2 October 1993 UDC 621.396.7:681.84.083.84:681.327.636 Descrip
11、tors: Audio recording, digital recording, magnetic tape, data converter, code, format, recording characteristics, recording track English version Digital audio tape recorder reel to reel system, using 6,3mm magnetic tape, for professional use Part2: Format A (IEC1120-2:1991) Systme denregistrement b
12、ande audionumrique, bobine bobine, utilisant unebande magntique de6,3mm, usage professionnel Partie2: Format A (CEI1120-2:1991) Digitales Tonbandgert Spulensystem mit Magnetband6,3mm fr Studioanwendungen Teil2: Format A (IEC1120-2:1991) This European Standard was approved by CENELEC on1993-09-22. CE
13、NELEC 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 standards may be obtained on
14、 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 notified to the Central Sec
15、retariat 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 and UnitedKingdom. CENELE
16、C European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1993 Copyright reserved to CENELEC members Ref. No. EN61120-2:1993 EEN61120-2:1993 BSI 0
17、1-2000 2 Foreword The CENELEC questionnaire procedure, performed for finding out whether or not the International Standard IEC1120-2:1991 could be accepted without textual changes, has shown that no common modifications were necessary for the acceptance as a European Standard. The reference document
18、 was submitted to the CENELEC members for formal vote and was approved by CENELEC as EN61120-2 on22September1993. The following dates were fixed: For products which have complied with the relevant national standard before1994-09-01, as shown by the manufacturer or by a certification body, this previ
19、ous standard may continue to apply for production until1999-09-01. Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Contents Page Foreword 2 1 Main track recording 3 1.1 Recording modulation method 3 1.2 Signal block structure 3 1.2.1 The
20、word format 3 1.2.2 The block structure 4 1.2.3 Synchronization pattern 4 1.3 Signal word distribution to tracks 5 1.4 Error protection method 5 1.4.1 The error correction code 5 1.4.1.1 C2 Encoder 7 1.4.1.2 C1 encoder 9 1.4.2 Interleave sequence 9 1.5 Recording and reproducing characteristics 14 1.
21、5.1 Reference tape 14 1.5.2 Calibration tapes 14 1.5.3 Procedure for adjusting recording currentlevel and waveform 14 Page 1.5.4 Specifications of tolerance relative to calibration tape 14 2 Sub-track recording 14 2.1 Digital recording method 14 2.1.1 Recording method on sub-track2 14 2.2 Alignment
22、of digital audio signals and sub-track signals 14 2.2.1 Alignment of cue audio-1 and cue audio-2 track signal 14 2.2.2 Alignment of time code track signal 14 3 Control word 15 3.1 Control word configuration 15 3.2 Control data assignment 15 3.3 Block address 16 3.4 C3 Encoder 17 Annex ZA (normative)
23、 Other internationalpublications quoted inthisstandardwith the references of therelevantEuropean publications 18 Figure 1 Symbol and word structure (speed I) 8 Figure 2 Symbol and word structure (speed II) 10 Figure 3 C2 Encoder and interleave sequence 11 Figure 4 Example of data arrangement (speed
24、I) 12 Figure 5 Example of data arrangement (speed II) 12 Figure 6 Interleave map on the tape (speed I) 13 Figure 7 Interleave map on the tape (speed II) 13 latest date of publication ofan identical national standard (dop)1994-09-01 latest date of withdrawal ofconflicting national standards (dow)1994
25、-09-01EN61120-2:1993 BSI 01-2000 3 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 the8main digital tracks for recording on the magnetic tape
26、. The second item described in1.2.3, is the definition of the synchronization pattern in recording code. The converted code is given by NRZI. The2/4 M system is defined by dividing a binary data sequence into two-bit data segments and converting these into four-cell codes using the data of the four
27、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 cells “1” in a sequence of converted code. Th
28、e 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 have20 bits at speedI and16bits at speedII. PCM samples are specified as uniformly quantifi
29、ed and are represented in the form of sign bit (MSB) leading. Original data bits Converted code cells Contents 11 Y000 Unconditional 01 0010 10 10 10 10 10 0100 0001 0000 0100 Y001 “E 2 E 1 ”s “10” and “L 1 L 2 ”=“00” “E 2 E 1 ”=“10” and “L 1 L 2 ”=“00” “E 2 E 1 ”=“10”, “L 1L 2 ”=“10” and “L 3L 4 ”=
30、“00” “E 2 E 1 ”s “10”, “L 1L 2 ”=“10” and “L 3L 4 ”=“00” Except the foregoing 00 00 00 00 0000 0001 0000 0100 “E 4E 3 ”s, “10”, “E 2E 1 ”=“10” and “L 1L 2 ”s 01” “E 4E 3 ”s , “10”, “E 2E 1 ”=“10” and “L 1L 2 ”=“01” “E 4E 3 ”=“10” and “E 2E 1 ”=“10” Except the foregoing where: E n = data bits precede
31、d by n-bit, to2-bit data to be converted in original data sequence L n = data bits succeeded by n-bit, to2-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 sequenceEN61120-2:1993 4 BSI 01-2000 1.2.
32、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 Synchronization pattern The synchronization pattern in recording code consists of32 cells, in which the magnetization reversion interval is confine
33、d within the rule of2/4 M scheme, so as to protect the overwrite characteristics from deterioration, and a pattern of lower cross correlation function is chosen so as to let the probability of erroneous SYNC detection be reduced at the vicinity of SYNC signal. The synchronization pattern is represen
34、ted in NRZI, and given as follows. 00100001000100001001001000100000 recording direction BA = Bloc address ID = Identification data SYNC length p = 16 bits Control word or C3 length cw = 8 bits Data or C2 length d = 320 bits C1 (CRC) length c = 16 bits Frame length f = 360 bits Block configuration b
35、= 8 framesEN61120-2:1993 BSI 01-2000 5 1.3 Signal word distribution to tracks 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 Err
36、or protection method is two dimensional. Error detection is made possible by the 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
37、 correction code referred to as the RSC code shall be used. The RSC code is a sub-class of the generalized product code. The code is constructed by the(16,12,5) Reed-Solomon code over GF(2 8 ), as codeC2, and by the(344,328,4) CRC over GF(2), as code C1. Symbol interleaving has been performed betwee
38、n C2 encoding and C1 encoding. Generator polynomials for code C2, and code C1 are given by the following equations: G 1(x) is the generator polynominal based on CCITT V41 recommended16-bit Cyclic Redundancy Check (CRC) word: ! is the primitive element of GF(2 8 ). The vector representation of ! is a
39、nd the primitive polynomial g(x) is g (x)=x 8 +x 4 +x 3 +x 2 +1 All elements are shown in the following table: ! = (0 0 0 0 0 0 1 0) ! 7 ! 6 ! 5 ! 4 ! 3 ! 2 ! 1 ! 0EN61120-2:1993 6 BSI 01-2000The element over gf(2 8 ) Number Element Number Element Number Element Number Element 0 1 2 3 4 5 6 7 8 9 10
40、 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 00100
41、110 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 01000110
42、 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113
43、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 1
44、0100011 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 1001
45、0111 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 000
46、10111 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 10111
47、111 01100011 11000110 10010001 00111111 01111110 11111100 11100101 11010111 10110011 01111011 11110110 11110001 11111111 11100011 11011011 10101011 01001011 10010110 00110001 01100010 11000100 10010101 00110111 01101110 11011100 10100101 01010111 10101110 01000001 192 193 194 195 196 197 198 199 200
48、 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 10000010 00011001 00110010 01100100 11001000 10001101 00000111 00001110 0001110
49、0 00111000 01110000 11100000 11011101 10100111 01010011 10100110 01010001 10100010 01011001 10110010 01111001 11110010 11111001 11101111 11000011 10011011 00101011 01010110 10101100 01000101 10001010 00001001 00010010 00100100 01001000 10010000 00111101 01111010 11110100 11110101 11110111 11110011 11111011 11101011 11001011 10001011 00001011 00010110 00101100 01011000 10110000 01111101 11111010 11101001 11001111 10000011 00011011 00110110 01101100 11011000 10101101 01000111 10001110 00000001EN61120-2:1993 BSI 01-
