1、NORME INTERNATIONALE INTERNATIONAL STANDARD CE1 IEC 11 20-3 Premire dition First edition 1991-11 Systme denregistrement bande audio- numrique, bobine bobine, utilisant une bande magntique de 6,3 mm, usage professionnel Partie 3: Format B Digital audio tape recorder reel to reel system, using 6,3 mm
2、magnetic tape, for professional use Part 3: Format B Numro de rfrence Reference number CEI/IEC 1120-3: 1991 Validit de la prsente publication Le contenu technique des publications de la CE1 est cons- tamment revu par la CE1 afin quil reflte ltat actuel de la technique. Des renseignements relatifs la
3、 date de reconfirmation de la publication sont disponibles auprs du Bureau Central de la CEI. Les renseignements relatifs ces rvisions, ltablis- sement des ditions rvises et aux amendements peuvent tre obtenus auprs des Comits nationaux de la CE1 et dans les documents ci-dessous: Bulletin de la CE1
4、Annuaire de la CE1 Publi annuellement Catalogue des publications de la CE1 Publi annuellement et mis jour rgulirement Terminologie En ce qui concerne la terminologie gnrale, le lecteur se reportera la CE1 50: Vocabulaire Electrotechnique lnter- national (VEI), qui se prsente sous forme de chapitres
5、spars traitant chacun dun sujet dfini. Des dtails complets sur le VE1 peuvent tre obtenus sur demande. Voir galement le dictionnaire multilingue de la CEI. Les termes et dfinitions figurant dans la prsente publi- cation ont t soit tirs du VEI, soit spcifiquement approuvs aux fins de cette publicatio
6、n. Symboles graphiques et littraux Pour les symboles graphiques, les symboles littraux et les signes dusage gnral approuvs par la CEI, le lecteur consultera: - la CE1 27: Symboles littraux a utiliser en lectro-technique; - la CE1 417: Symboles graphiques utilisables sur le matriel. index, relev et c
7、ompilation des feuilles individuelles; - la CE1 617: Symboles graphiques pour schmas; et pour les appareils lectromdicaux, - ia CEI 878: Symboles graphiques pour quipements lectriques en pratique mdicale. Les symboles et signes contenus dans la prsente publi- cation ont t soit tirs de la CE1 27, de
8、la CE1 417, de la CE1 617 et/ou de la CE1 878, soit spcifiquement approuvs aux fins de cette publication. Publications de la CE1 tablies par le mme comit dtudes Lattention du lecteur est attire sur les listes figurant la fin de cette publication, qui numrent les publications de la CE1 prpares par le
9、 comit dtudes qui a tabli la prsente publication. Validity of this publication The technical content of IEC publications is kept under constant review by the IEC, thus ensuring that the content reflects current technology. Information relating to the date of the reconfirmation of the publication is
10、available from the IEC Central Office. Information on the revision work, the issue of revised editions and amendments may be obtained from IEC National Committees and from the following IEC sources: IEC Bulletin IEC Yearbook Catalogue of IEC publications Published yearly Published yearly with regula
11、r updates Terminology For general terminology, readers are referred to IEC 50: international Eiectrotechnical Vocabulary (I EV), which is issued in the form of separate chapters each dealing with a specific field. Full details of the IEV will be supplied on request. See also the IEC Multilingual Dic
12、tionary. The terms and definitions contained in the present publi- cation have either been taken from the IEV or have been specifically approved for the purpose of this publication. Graphical and letter symbols For graphical symbols, and letter symbols and signs approved by the IEC for general use,
13、readers are referred to publications: - IEC 27: Letter symbols to be used in electrical technology; - IEC 417: Graphical symbols for use on equipment. Index, survey and compilation of the single sheets; - IEC 61 7: Graphical symbols for diagrams; and for medical electrical equipment, - equipment in
14、medical practice. IEC 878: Graphical symbols for electromedical The symbols and signs contained in the present publication have either been taken from IEC 27, IEC 417, IEC 617 and/or IEC 878, or have been specifically approved for the purpose of this publication. IEC publications prepared by the sam
15、e technical committee The attention of readers is drawn to the end pages of this publication which list the IEC publications issued by the technical committee which has prepared the present publication. NORME INTERNATIONALE INTERNATIONAL STANDARD CE1 IEC 1 120-3 Premire dition First edition 1991-1 1
16、 Systme denregistrement bande audio- numrique, bobine bobine, utilisant une bande magntique de 6,3 mm, usage professionnel Partie 3: Format B Digital audio tape recorder reel to reel system, using 6,3 mm magnetic tape, for professional use Part 3: Format B 0 CE1 1991 Droits de reproduction rservs- C
17、opyright - all rights reserved Aucune partie de cette publication ne peut la forme donde de sortie est non polarise. Les rgles de gnration dune paire de cellule de forme donde de sortie pour chaque bit dentre sont dfinies dans la formulation suivante et les transitions de bit forme donde sont dfinie
18、s dans les rgles 1 et 2. * Formulation de la modulation de bit en forme donde. - - _- T = BORD. (X2X1 ) + BORD.(X2.X1 .Tl+X2.X1 .XO.Tl .T2+X1 .XZ.X3X4.T2.T4.T6) Xi = BIT DENTRE RETARD DE i PRIODES DHORLOGE DE BIT j = CELLULE DE FORME DONDE DE SORTIE RETARDE DE j PRIODES DHORLOGE DE CELLULE BORD: VAR
19、IABLE DE TEMPO, O AU CENTRE, 1 EN BORDURE DE LA CELLULE DE BIT * Rgle 1 (transition centrales): Une squence de bits de donnes de “01“ conduit toujours une transition centrale au milieu du bit “1 “. 1 120-3 O IEC -7- DIGITAL AUDIO TAPE RECORDER REEL TO REEL SYSTEM, USING 6,3 mm MAGNETIC TAPE, FOR PRO
20、FESSIONAL USE Part 3: Format B Electrical requirements for recording and reproducing equipment. 1 Main track recording 1.1 Recording modulation method In this subclause the modulation of a binary data sequence (“incoming data“) into a record signal waveform (“output wave form“) is specified. Next, a
21、 synchronization pattern violating the modulation rules is defined. The data to be recorded onto the main tracks are first channel-coded. A non-D.C.-free, run-length-limited code called HDM-1 is used. The output waveform is defined by two cells for each input data bit. Only transitions in the output
22、 waveform are defined; the output waveform is polarity-free. 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. * Formulation for bit to waveform modulation. - - - T = EDGE. (X
23、2.Xl)+ EDGE.(X2.Xl.Tl+X2.X1 .XO.Tl.T2+Xl .X2.X8X4.T2.T4.T6) Xi = Ti = INPUT BIT DELAYED BY i BIT CLOCKS OUTPUT WAVEFORM CELL DELAYED BY j CELL CLOCK EDGE: TIMING VARIABLE, O AT CENTER, 1 AT EDGE OF BIT INTERVAL * Rule 1 (center transitions): A data bit sequence of “01“ always leads to a center transition in the middle of the “1“ bit.
