1、 STD.BSI BS EN b1595-2-ENGL 1998 Lb2LibbS b90098 OLL I BRITISH STANDARD Multichannel digital audio tape recorder (DATR), reel-to-reel system, for professional use Part 2. Format B * 10 * The European Standard EN 615952 : 1997 has the status of a British Standard ICs 33.160.30 NO COPYING WITHOUT BSI
2、PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 61595-2 : 1998 IEC 61595-2 1997 STD-BSI BS EN b1575-2-ENGL 1778 1b24bb9 Ob90077 T5B = AmdNo. BS EN 61695-2 : 1998 Date Text affected This British Standard, having been prepared under the direction of the Elechtechnica Sector Board, was published
3、under the authority of the Standards Board and comes into effect on 15 Mach 1998 O BSI 1998 National foreword This British Standard is the English language version of EN 615952 : 1998. It is identical with IEC 615952 : 1997. The K participation in its preparation was entrusted to Technical Committee
4、 EPU100, Audio, video and multimedia systems and equipment, to Subcommittee EPU100/2, Recording, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible inte - monitor related international and European developments and promulgate them in the UK A list o
5、f organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbe
6、ring 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 intrnational publications with their corresponding European publications. The
7、 British Standards which implement international or European publications 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. Compliance with a British Standard d
8、oes not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 28, an inside back cover and a back cover. Amendments issued since publication ISBN O 580 28424 7 STD-BSI BS EN b1575-2-ENGL 1998 Lb2
9、Libb7 Ob70100 5TT EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61595-2 January 1998 ICs 33.160.30 Descriptors: Sound recording, digital recording, recording apparatus. tapa recorders, magnetic tapes, dimensions, numeric codgs, recording tracks, mechanical properties, electrical properties. r
10、ecording characteristics, interchangeability English version Multichannel digital audio tape recorder (DATR), reel-to-reel system, for prof essional use Part 2: Format B (IEC 61 595-2:1997) Systme denregistrement bande audionumrique multivoie (DATR), bobine bobine, usage professionnel Partie 2: Form
11、at B Digitales Mehrkanal-Tonbandgert (DATR), Spulensystem fr Studioan wendung en Teil 2: Format B (CE1 61 595-21997) (IEC 61 595-2:1997) * * m This European Standard was approved by CENELEC on 1997-07-01. CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate th
12、e 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 application to the Central Secretariat or to any CENELEC member. This European Standard exist
13、s 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 Secretariat has the same status as the official versions. CENELEC members are the national electro
14、technical committees of Austria, Belgium, Czech Republic, 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 Nor
15、malisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels _ 1998 CENELEC - All rights of exploitation in any form and by any means resewed worldwide for CENELEC members. Ref. No. EN 61595-2:1998 E Page 2 EN 61595-2 : 1998
16、Foreword The text of document 1006/49/FDIS, future edition 1 of IEC 61 595-2, prepared by SC 1 OOB, Recording, of IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61 595-2 on 1997-07-01. The following date
17、s were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1998-07-0 - latest date by which the national standards conflicting with the EN have to be withdrawn - (dow) 1998-07-0 Annexes designated “norm
18、ative“ 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 informative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 61595-2:1997 was approve
19、d by CENELEC as a European Standard without any modification. In the official version, for annex A, Bibliography, the following notes have to be added for the standards indicated: IEC 60094 NOTE: Harmonized as HD 31 1 series and as EN 60094 series. IEC 60268-1 2 NOTE: Harmonized, together with its a
20、mendment 1 :1991, as EN 60268-1 2: 1995 (not modified). IEC 60958 NOTE Harmonized as EN 60958:1990 (not modified). IEC 61 120-1 NOTE: Harmonized as EN 61 120-1:1993 inot modified). IEC 6 1 120-2 NOTE: Harmonized as EN 6 1 1 20-2: 1993 inot modified). IEC 61 120.3 NOTE Harmonized as EN 61 120-3:1993
21、(not modified). IEC 61 120-5 NOTE: Harmonized as EN 61 120-51 995 inot modifid). * * rn Clause Page 3 EN 61595-2 : 1998 CONTENTS 1 Scope . 2 Normative references 3 Definitions . Data flow of a digital audio tape recorder 4 Digital encoding 4.1 Sampling frequency . 4.2 Sampling timing . 4.3 Quantizat
22、ion 5 Tape speed . 6 Tape width and number of digital audio channels . 7 Tape winding Allocation and dimension of magnetic tracks . Assignment of magnetic tracks 11 Emphasis 12 Main track recording . 12.1 Recording modulation method 12.1.1 Rule 1 (centre transitions) 12.1.2 Rule 2 (edge transitions)
23、 12.2 Signal block structure . 12.2.1 The word format . 12.2.2 The block structure 12.2.3 The sync/controi word 12.3 Track-to-channel assignment . 12.4 Error protection method . 12.4.1 Interleaving and parity sums . 12.4.2 The CRC word . 12.5 Recording and reproducing characteristics . 12.5.1 Refere
24、nce tape 13 Subtrack recording 13.1 Time code channel (time code track) 13.2 Auxiliary data channel 13.2.1 Reference track . 13.2.2 Auxiliary data channel (auxiliary data track) 13.3 Auxiliary analogue channel (cue audio-1 track and/or cue audio-2 track) . 3.1 8 Reel and hub 9 10 Page 5 5 5 5 7 7 7
25、7 7 7 8 8 a 8 12 12 12 13 13 15 15 15 17 17 21 21 22 23 23 23 23 23 23 26 26 O BCI 1998 Page 4 EN 61595-2 : 1998 13.4 Alignment of digital audio signals and subtrack signals . 13.4.1 Alignment of cue audio-1 and cue audio-2 track signals 13.4.2 Alignment of time code track signal 13.4.3 Alignment of
26、 reference track signal . Annex A . Bibliography Tables 1 Tape width and number of digital audio channels . 2 Track assignment 3 Block structure 4 24-channel version 5 48-channel version 6 96-channel version Figures 1 2 3 4 5 6 7 Emphasis characteristics . 8 Rule 1 (centre transitions) . 9 10 11 Rul
27、e 2 (edge transitions) case 3 12 Block address . 13 The total signal block structure 14 15 Computation of P and Q check words 16 Contents of one block. referred to one track input sequence 17 Range of CRC word 18 Biphase-mark coding rules 19 Word format of the reference track word . Data flow of the
28、 main audio channels of a DATR (digital audio tape recorder) Recording channels of a DATR (digital audio tape recorder) Reproducing channels of a DATR (digital audio tape recorder) Track pattern for DATR on magnetic tape (28 tracks with 12. 7 mm tape width) Track pattern for DATR on magnetic tape (5
29、2 tracks with 12. 7 mm tape width) Track pattern for DATR on magnetic tape (103 tracks with 254 mm tape width) Rule 2 (edge transitions) case 1 Rule 2 (edge transitions) case 2 Time diagram of the sync/control word 20 The synchronization pattern and definition of the beginning of a sector . Effectiv
30、e computation range of the CRC word 21 Control word . 22 26 26 26 26 27 8 8 15 18 19 20 6 6 7 9 10 11 12 13 14 14 15 16 16 17 21 22 22 24 24 25 25 26 O BSI 1998 STD-BSI BS EN bL575-2-ENGL 1978 m 1b24bb Ob7OL04 145 m Page 5 EN 61595-2 : 1998 MULTICHANNEL DIGITAL AUDIO TAPE RECORDER (DATR), REEL-TO-RE
31、EL SYSTEM, FOR PROFESSIONAL USE - Part 2: Format B 1 Scope This part of IEC 61595 applies to 24 to 96 channel digital audio recording on 12,7 mm or 25,4 mm wide tape (hereinafter called tape), with stationary heads, for professional use. It defines the mechanical and electrical characteristics neces
32、sary to ensure the interchangeability of programmes, recorded as digital audio signals on magnetic tape, in professional industries. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 61595. At
33、the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 61595 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Member
34、s of IEC and IS0 maintain registers of currently valid International Standards. IEC 60461 : 1986, Time and control code for video tape recorders IEC 61120-4: 1992, Digital audio tape recorder reel-to-reel system, using 6,3 rnrn magnetic tape, for professional use - Part 4: Magnetic tape properties:
35、definitions and method of measurement ITU-T V.41: 1988, Code-independent error control system 3 Definitions For the purpose of this part of IEC 61595, 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
36、(digital audio tape recorder). Figure 2 shows the recording channels of a DATR. Figure 3 shows the reproducing channels of a DATR. STD.BS1 BS EN bL595-2-ENGL 1778 D Lb24bb9 0b90L05 O81 m Analogue input O # Page 6 EN 61595-2 : 1998 Encoder Modulator A/D converter O , 0 Digital audio interface 4 - Wri
37、te amplifier o , . I Digital audio b interface Digital Modulator Analogue output + amplifier O ND converter Figure 1 - Data flow of the main audio channels of a DATR (digital audio tape recorder) b Main audio and write b processing amplifier tracks - Digital audio input Analogue audio input Analogue
38、 audio input 1 Analogue audio input 2 Auxiliary data input 0 , O b Auxiliary channels for audio cueing andlor data modulator b b Auxiliary data input (reference signal) Time code I input b b IEC 75597 Figure 2 - Recording channels of a DATR (digital audio tape recorder) STD.BSI BS EN bL595-2-ENGL 19
39、98 H Lb24bb ObSOLOb TIA H o b Main tracks Page 7 EN 61595-2 1998 Digital audio Digital Demodulator interface o audiooutput Digitai audio processing read amplifier 3 * % u) Analogue 0 audio output 1 Auxjliary channels Analogue audio output 2 for audio cueing andlor data demodulator Auxiliary 0 dataou
40、tput Subtracks Auxiliary 0 dataoutput Auxiliary data channel demodulator (reference signai) I Time code 0 output IEC 75w7 Figure 3 - Reproducing channels of a DATR (digital audio tape recorder) 4 Digital encoding 4.1 Sampling frequency The sampling frequency shall be 48 kHz, and the accuracy of the
41、sampling frequency at encoding shall be f 50 x 4.2 Sampling timing It is recommended that all channels are sampled simultaneously. 4.3 Quantization Each audio sample shall be quantized uniformly and be expressed in 16 bits, 2 s complement code. Positive numbers correspond to positive analogue voltag
42、es at the input. 5 Tapespeed The tape speed shall be nominal 76,20 cm/s. The tolerance on tape speed shall be within 0,2 %. 6 Tape width and number of digital audio channels O O The tape width shall be 25,37-0, mm (nominal 25,4 mm) or l2,66-, mm (nominal 12,7 mm). Table 1 shows tape width and number
43、 of digital audio channels. STD.BS1 BS EN bL595-2-ENGL 1998 LbZqbbS Ob90L07 954 Items Tape width (mm) Page 8 EN 61595-2 : 1998 Contents 25,4 12,7 Table 1 - Tape width and number of digital audio channels I Tape width (mm) Track number 254 I 12.7 I Number of audio channels I 96 I 48 I 24 I Cue audio-
44、1 Cue audio-2 Sub Main Number of tracks 111 Total Main tracks I audio channels 1/1 1/1 1 103 7 Tape winding The magnetic coating faces the centre of the reel. 8 Reelandhub Under consideration. 9 Allocation and dimension of magnetic tracks The figures 4, 5 and 6 show the track allocations on magnetic
45、 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 leader to the right, the bottom track is designated track 1, the next upper track is designated track 2 and so on. Table 2 shows the assignment of mag
46、netic tracks. Table 2 - Track assignment Type of track Main I Diaital audio I 4.99 I Time code 13 I Reference I 101 p Auxiliary data 2,100,102 225, 28.51 I 213; 1627 26 I 14 I 52 28 I Refer to 13.2.2. STD-BSI BS EN b1575-2-ENGL 1778 = 1b24bb7 Ob70108 870 I -Track28 Page 9 EN 61595-2 : 1998 -Track 27
47、 .- “I ? O cx 1 l?J I I l I UI o- I pj O v I l Y .i. N O O o. 9 I% E the output data is independent of waveform polarity. Rules for generating a pair of output waveform cells for each input bit are defined in the following formulation and bit to waveform transitions are defined in rules 1 and 2. * *
48、 rn Page 13 EN 61595-2 : 1998 Formulation for bit to waveform modulation: T = m (E Xl)+ EDGE (Ez T1+ X2 X1 0; Transition sequence of HDM-1 cells caused by “0000“ bit sequence in the absence of transitions at . Resulting HDM-1 cells waveform Alternate HDM-1 cells waveform IEC 76647 Figure 11 - Rule 2
49、 (edge transitions) case 3 As a consequence of the rules of HDM-1 encoding, the minimum distance between transitions in a HDM-1 signal is three cells. The maximum distance is nine cells, and two consecutive transition distances cannot be both equal to nine cells. This makes it possible to use two consecutive run lengths of nine cells as a synchronization pattern which violates the rules of HDM-1. 12.2 Signai block structure 12.2.1 The word format A word length of 16 bits and MSB leading shall be used 12.2.2 The bloc
