1、BRITISH STANDARD BS EN 61120-1:1993 IEC1120-1: 1991 Digital audio tape recorder reel to reel system, using6.3mm magnetic tape, for professional use Part 1: General requirements The European Standard EN61120-1:1993 has the status of a BritishStandard UDC 621.396.7:681.84.083.84:681.327.636BSEN61120-1
2、:1993 This BritishStandard, having been prepared under the directionof the Electronic Equipment Standards Policy Committee, was published underthe authority of the Standards Board and comesintoeffect on 15August1993 BSI 01-2000 The following BSI references relate to the work on this standard: Commit
3、tee reference EEL/22 Draft for comment 89/21780 DC ISBN 0 580 22438 4 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 It
4、aly Belgium Luxembourg Denmark Netherlands Finland Norway France Portugal Germany Spain Greece Sweden Iceland Switzerland Ireland UnitedKingdom Amendments issued since publication Amd. No. Date CommentsBSEN61120-1:1993 BSI 01-2000 i Contents Page Cooperating organizations Inside front cover National
5、 foreword ii Foreword 2 Text of EN 61120-1 3 National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN61120-1:1993 ii BSI 01-2000 National foreword This BritishStandard has been prepared under the direction of the
6、Electronic Equipment Standards Policy Committee and is the English language version of EN61120-1:1993 Digital audio tape recorder reel to reel system, using6,3mm magnetic tape, for professional use, Part1: General requirements, published by the European Committee for Electrotechnical Standardization
7、 (CENELEC). It is identical with IEC1120-1:1991, published by the International Electrotechnical Commission (IEC). BS EN61120 consists of the following Parts. Part1: General requirements; Part2: Format A 1) ; Part3: Format B 1) ; Part4: Magnetic tape properties: definitions and methods of measuremen
8、t 1) ; Part5: Reels for6.3mm digital audio tape 1) . 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 o
9、bligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to12, 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 a
10、mendment table on the inside front cover. 1) In preparation.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61120-1 April 1993 UDC 621.396.7:681.84.083.84:681.327.636 Descriptors: Audio recording, stereophonicsound, digital signal, magnetic tape, audio tape recorder, mechanical characteristics,
11、 electrical characteristics, encoding, recording tracks, interchangeability English version Digital audio tape recorder reel to reel system, using6,3mm magnetic tape, for professional use Part1: General requirements (IEC1120-1:1991) Systme d enregistrement bande audionumrique, bobine bobine, utilisa
12、nt une bande magntique de6,3mm, usage professionnel Partie1: Gnralits (CEI1120-1:1991) Digitales Tonbandgert Spulensystem mit Magnetband6,3mm fr Studioanwendungen Teil1: Allgemeines (IEC1120-1:1991) This European Standard was approved by CENELEC on1993-03-09. CENELEC members are bound to comply with
13、 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 application to the Central Secretaria
14、t 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 Secretariat has the same status as the of
15、ficial 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. CENELEC European Committee for Electrotechni
16、cal Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1993 Copyright reserved to all CENELEC members Ref. No. EN61120-1:1993 EEN61120-1:1993 BSI 01-2000 2 Foreword The CENELEC ques
17、tionnaire procedure, performed for finding out whether or not the International Standard IEC1120-1:1991 could be accepted without textual changes, has shown that no common modifications were necessary for the acceptance as European Standard. The reference document was submitted to the CENELEC member
18、s for formal vote and was approved by CENELEC as EN61120-1 on9 March1993. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 3.1 Data
19、 flow of a digital audio tape recorder 3 4 Digital encoding 6 4.1 Sampling frequency 6 4.2 Sampling timing 6 4.3 Quantization 6 5 Tape speed 6 6 Tape winding 6 7 Reel and hub 6 8 Allocation and dimension of magnetic tracks 7 9 Assignment and dimension of magnetictracks 7 10 Emphasis 9 11 Auxiliary c
20、hannels 9 11.1 Time code channel (sub-track1) 9 11.1.1 Time code recording 9 11.1.2 Recording method 9 11.2 Auxiliary data channel (sub-track2) 9 11.2.1 Recording method 9 11.3 Auxiliary channels (sub-tracks3 and4) 9 11.3.1 Auxiliary channels for format A 9 11.3.2 Auxiliary channels for format B 9 1
21、1.4 Alignment 9 12 Identification 10 12.1 Format identification 10 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications 11 Figure 1 Data flow of the main audio channels of a DATR 4 Figure 2 Recording channels of a DAT
22、R 5 Figure 3 Reproducing channels of a DATR 6 Figure 4 Track pattern for DATR on6,3mm magnetic tape 8 latest date of publication of an identical national standard (dop)1994-03-01 latest date of withdrawal of conflicting standards (dow)1994-03-01EN61120-1:1993 BSI 01-2000 3 1 Scope This part of IEC11
23、20 applies to stereophonic digital audio recording on6,3mm wide tape with stationary heads for professional use. It defines the mechanical and electrical characteristics necessary to ensure the interchangeability of programme recorded digital audio signal on magnetic tape amongst professional indust
24、ries. This standard is presented in three parts. Parts2 and3 describe two formats usable within part1. It is practical to have switchable operation between these two formats. Consequently it is logical to include both in one standard. 2 Normative references The following standards contain provisions
25、 which, through reference in this text, constitute provisions of this part of IEC1120. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IEC1120 are encouraged to investigate the possibility of applyi
26、ng the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC94, Magnetic tape sound recording and reproducing systems. IEC268-12:1987, Sound system equipment Part12: Application of connectors for broadcast and
27、 similar use. IEC268-15:1987, Sound system equipment Part15: Preferred matching values for interconnection of sound system components. IEC461:1986, Time and control code for video tape recorders. IEC899:1987, Sampling rate and source encoding for professional digital audio recording. 3 Definitions F
28、or the purpose of this part ofIEC1120, 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 cha
29、nnels of a DATR. Audio channel1=left channel (L). Audio channel2=right channel (R). EN61120-1:1993 4 BSI 01-2000 Figure 1 Data flow of the main audio channels of a DATREN61120-1:1993 BSI 01-2000 5 Figure 2 Recording channels of a DATREN61120-1:1993 6 BSI 01-2000 4 Digital encoding 4.1 Sampling frequ
30、ency The sampling frequency shall be48kHz, and the accuracy of the sampling frequency at encoding shall be 50ppm. 4.2 Sampling timing It is recommended that two channels are sampled simultaneously. 4.3 Quantization Each audio sample shall be quantized uniformly and be expressed in16bits,2s complemen
31、t code, and MSB leading shall be used. 5 Tape speed The tape speed shall be nominal38,1cm/s (hereafter called speed I) and19,05cm/s (hereafter called speedII). The tolerance on tape speeds shall be within0,2%. 6 Tape winding The magnetic coating faces the centre of the reel. 7 Reel and hub Under con
32、sideration. Figure 3 Reproducing channels of a DATREN61120-1:1993 BSI 01-2000 7 8 Allocation and dimension of magnetic tracks Figure 4 shows the track allocation on magnetic tape. 9 Assignment and dimension of magnetic tracks Under normal operation, the designation of magnetic tracks is as follows:
33、If the tape moves from left to right with the magnetic coating facing away from the observer and with the leader to the right, the top track is designated sub-track4, the next lower track is designated sub-track3 and so on. Track assignment Track Format A Format B 3-10 MAIN TRACK 1 to8 DA DA 1 SUB-T
34、RACK 1 TC TC 2 SUB-TRACK 2 AUX-D PRT 11 SUB-TRACK 3 CUE-CH1 CUE-CH2 AUX-D 12 SUB-TRACK 4 CUE-CH2 CUE-CH1 CUE-CH1 and2 DA: Two digital audio channels TC: Time code channel RT: Reference Track AUX-D: Auxiliary data channel CUE-CH1: Cue audio1 CUE-CH2: Cue audio2EN61120-1:1993 8 BSI 01-2000 Figure 4 Tr
35、ack pattern for DATR on6,3mm magnetic tapeEN61120-1:1993 BSI 01-2000 9 10 Emphasis In general the use of emphasis is not recommended. If pre-emphasis is applied, it is identified on the tape, and the emphasis shall be used with the characteristics of a first order pre-emphasis as shown below. 11 Aux
36、iliary channels The two formats allow the recording of four auxiliary channels on sub-tracks. 11.1 Time code channel (sub-track1) One time code channel unsynchronized to digital audio is provided. 11.1.1 Time code recording The time code according to IEC461 is recorded in the longitudinal direction
37、of the tape. 11.1.2 Recording method Time code channel is recorded on tape by the direct recording method. 11.2 Auxiliary data channel (sub-track2) The auxiliary data channel may be used for the recording of user information (format A) or reference track signal (format B). 11.2.1 Recording method Au
38、xiliary data channel is recorded on tape by the direct recording method. 11.3 Auxiliary channels (sub-tracks3 and4) 11.3.1 Auxiliary channels for format A Two independent cue audio signals are recorded by PWM modulation on the tape and contain the same audio information as digital audio channels. 11
39、.3.2 Auxiliary channels for format B The cue audio signals are recorded analogue (direct) or with PWM modulation. For auxiliary data on sub-track3, they are recorded by the direct recording method. If auxiliary data recording is used, a monophonic cue audio signal is recorded on sub-track4. 11.4 Ali
40、gnment The relative location of recording for four auxiliary channels with the digital audio channels on the tape shall be specified for compatibility. The alignment tolerance is defined in2.2 of parts2 and3 of this standard.EN61120-1:1993 10 BSI 01-2000 12 Identification 12.1 Format identification
41、The identification format shall consist of unit frames and unassigned address bit No.58 in time and control code for video tape recommended by IEC461. Identification data assignment Unit of frames Unassigned address bit No. 58 Format 0000 0 Not used 0001 1 Write protection 0010 1 Format A identifica
42、tion 0011 1 Format B identification 0100 1 Reserved for format identification 0101 1 Reserved for format identification 0110 1 Reserved 0111 1 Reserved 1000 1 Reserved 1001 1 ReservedEN61120-1:1993 BSI 01-2000 11 Annex ZA (normative) Other international publications quoted in this standard with the
43、references of the relevant European publications When the international publication has been modified by CENELEC common modifications, indicated by (mod), the relevant EN/HD applies. IEC publication Date Title EN/HD Date 94 series Magnetic tape sound recording and reproducing systems Sound system eq
44、uipment HD311 series 268-12 1987 Part12: Application of connectors for broadcast andsimilar use HD483.12 S2 a 1993 268-15 1987 Part15: Preferred matching values for the interconnection of sound system components HD483.15 S4 a 1992 461 1986 Time and control code for video tape recorders HD507 S1 1988
45、 899 1987 Sampling rate and source encoding for professionaldigital audio recording a HD483.12 S2 includes A1:1991 to IEC268-12 HD483.15 S4 includes A1:1989+A2:1990+A3:1991 to IEC268-1512 blankBSEN61120-1:1993 BSI 01-2000 National annex NA (informative) Committees responsible The UnitedKingdom parti
46、cipation in the preparation of this European Standard was entrusted by the Electronic Equipment Standards Policy Committee (EEL/-) to Technical Committee EEL/22 upon which the following bodies were represented: Association of Professional Recording Services Ltd. Audio Engineering Society British Bro
47、adcasting Corporation British Kinematograph, Sound and Television Society British Tape Industry Association Independent Television Association National Council for Educational Technology (NCET) Royal Photographic Society Royal Television Society National annex NB(informative) Cross-references Public
48、ation referred to Corresponding BritishStandard HD311 Series BS6288 Series Magnetic tape sound recording and reproducing systems BS6840 Sound system equipment HD483-12 S2:1993 Part12:1987 Specification for applications of connectors for broadcast and similar use HD483-15 S4:1992 Part15:1992 Specific
49、ation for matching values for the interconnection of sound system components HD507 S1:1988 BS6865:1987 Specification for time and control codes for video tape recordersBS EN 61120-1:1993 IEC1120-1: 1991 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are update
