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1、- .J IEC I1055 P T * I 9L 4844891 OLL7050 2 RAPPORT TECHNIQUE TECHNICAL REPORT . CE1 IEC 1055-.1 Premire dition First edition 1991 -05 Techniques de mesures et rglages en exploitation des magntoscopes de radiodiffusion Partie 1: Rglages en exploitation des magntoscopes de radiodiffusion analogiques
2、composites Measurement techniques and operational adjustments of broadcast VTRs Part 1: Operational adjustments on analogue composite broadcast VTRs Numro de rfrence Reference number CEIIIEC 1055-1 : 1991 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicen
3、see=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/09/2007 03:04:24 MSTNo reproduction or networking permitted without license from IHS -,-,- IEC 1055 PT81 71 Rvision de ia prsente publication Lc contenu technique des publications de la C E I est cws- tamment revu par la Commission a
4、 f i n dassurer quil reflte bien ltat achiel de ia technique. Les renseigncments relatifs ce travail de rvision, ltablissement des ditions rvises et aux mises jour peuvent Etm obtenus auph des Comits nationaux de ia C E I et en consultant les documents ci-dessous: BulietLidelaCEI Annuairedela CE1 Ca
5、talogue des publications de ia C E I Publi annuellanent Terminologie En a qui concerne la terminologie gnraie, le lecteur SC reportera la hblication 50 de la CEI: Vocabulak Elcctrotachnique International 0. qui est tablie m u s fome de chapitres - ia Pubkation 617 de la C E I Symbolw graphiques pour
6、 schmas. Les symboies et signes contenus dans la pdeente publication ont t s o i t - - I E C Publidon 617: Graphical symbols for diagrams. nie symbols and signs contained in the present pubkation haw either been taken f r o m IEC Publications 27 or 617. or have ban bpacifiscay. approved for the plil
7、pose ofthis pubiicatiion IE C publications prepared by the same Technical Committee The attention o f nders is drawn to the back cover, which lists IEC publications issucd by the Technical Committee which has prepared the present publication. Copyright International Electrotechnical Commission Provi
8、ded by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/09/2007 03:04:24 MSTNo reproduction or networking permitted without license from IHS -,-,- IEC LO55 PT*L 71 W 4844871 OLL7052 b RAPPORT i TECHNIQUE TECHNICAL REPORT CE1 IEC 1055=1 Premire dition
9、First edition 1991-05 Techniques de mesures et rglages en exploitation des magntoscopes de radiodiffusion Partie 1: Rglages en exploitation des magntoscopes de radiodiffusion analogiques composites Measurement techniques and operational adjustments of broadcast VTRs Part 1: Operational adjustments o
10、n analogue composite broadcast VT Rs Bureau Centml de t a Commission Electrotechnique Inteinahde 3 . rue de VanmibB QeneVe, Suisse CODE PRIX PRICECODE v Commission Electrotechnique Internationale International Elecrotechnical Commission Copyright International Electrotechnical Commission Provided by
11、 IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/09/2007 03:04:24 MSTNo reproduction or networking permitted without license from IHS -,-,- I E C 3055 PT* ce dernier type denregistrement nest pas recommand pour les changes internationaux, mais il est
12、 largement rpandu pour les reportages lectroniques. Ces trois sections ont t tablies la suite des tudes du groupe spcialis6 G2MES. Lannexe A dcrit les prcautions prendre lors de la manipulation des bandes talons si lon veut conserver ces bandes la prcision necessaire aux rglages. On a mentionne dans
13、 la bibliographie (annexe B) la documentation fournie par les orga- nisme internationaux qui tudient la normalisation de lenregistrement magnetique de la tlvision, notamment les normes de lUER et les publications de la CEI. Copyright International Electrotechnical Commission Provided by IHS under li
14、cense with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/09/2007 03:04:24 MSTNo reproduction or networking permitted without license from IHS -,-,- I E C 1055 P T * I 71 m 4844871 0117Obo 5 m 1055-1 0 IEC -9- INTRODUCTION This technical report describes the operational a
15、lignment procedures which are peculiar to VTRs of the types used in television production and which are recommended for adoption within the EBU. It is important for these machines to be aligned according to clearly defined criteria so that recorded tapes will conform to the standards and to avoid co
16、mpati- bility problems during international programme exchanges. These recommendations are based on the results of investigations conducted by EBU Sub-group 62 (Television tape-recording). Section 1, concerning transverse-track VTRs, comprises the corresponding passages of EBU document Tech. 3219 (p
17、ublished in 1976) suitably up-dated. Sections 2 and 3 are concerned with B-format and C-format VTRs using 25.4 mm tape. Section 4 is concerned with U-matic H machines using 19 mm tape; this type of recording is not recommended for international exchanges but it is in widespread use for ENG. These th
18、ree sections have been written following studies by Specialist Group G2/MES. . Annex A describes the precautions to be taken whilst handling reference tapes if they are to retain the accuracy needed for alignment purposes. A bibliography (annex B) lists documents issued by the international organiza
19、tions Involved in the standardization of magnetic television recording; in particular, it includes the relevant EBU standards and IEC publications. 1 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for
20、 Resale, 03/09/2007 03:04:24 MSTNo reproduction or networking permitted without license from IHS -,-,- - IEC 3055 PT*3 93 4844893 0337063 7 H -10- , 1055-1 0 CE1 TECHNIQUES DE MESURES ET RGLAGES EN EXPLOITATION DES MAGNTOSCOPES DE RADIODIFFUSION Partie 1 : Rglages en exploitation des magntoscopes de
21、 radiodiffusion analogiques composites SECTION O: GENERALITES 0.1 Domaine dapplication Le prsent rapport technique dfinit les rglages en exploitation des magntoscopes de radiodiffusion analogiques composites. SECTION 1 : REGLAGE DES MAGNETOSCOPES A PISTES TRANSVERSALES 1 .I Le but de la bande de rgl
22、age est de rendre la vrification du magntoscope aussi Simple que possible; on a donc group diffrents signaux en une seule image de faon pouvoir faire plusieurs vrifications en observant dune part limage, et dautre part le signal affich sur lcran dun oscilloscope de profil. Bande de rglage de lUER La
23、 figure 1 montre la forme des signaux observes avant enregistrement. La moiti supe- rieure de limage est constitue du signal dinsertion prvu par le CCIR pour la ligne 330, rpt sur chaque ligne: barre de luminance, impulsion 2T en sinus carr et escalier de luminance cinq paliers avec sous-porteuse su
24、perpose. La moiti infrieure de limage est constitue de barres de couleur du type 100/0/75/0*. La piste audio porte des annonces alternativement en franais et en anglais, interrompues par une tonalit 1 O00 Hz au niveau de rfrence de 100 nWb/m eff. La piste,dordres est vierge. Le support utilis est un
25、e bande Scotch 400 de caractristiques moyennes, livre en bobines dassez grande longueur. On prvoit que les organismes de radiodiffusion ia couperont en tronons plus courts utiliss pour le rglage et quils pourront meme coller ces tronons de petites longueurs de la bande quils utilisent normalement (v
26、oir article 1.3). Le texte complet des spcifications de WER applicable la bande de rglage pour magntoscopes pistes transversales figure dans le document Tech. 3084 de lUER i*. Pour les Ubikateurs du Royaume-Uni, les barres de couleur sont du type 10010/100/0. Les chies entre croches se rapportent la
27、 Mbliographie, annexe B, page (io. * Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/09/2007 03:04:24 MSTNo reproduction or networking permitted without license from IHS -,-,- IEC 1055 P
28、T*1 91 E 4844891 O1170b2 9 10551 0 IEC -11 - MEASUREMENT TECHNIQUES AND OPERATIONAL ADJUSTMENTS OF BROADCAST VTRs Part 1 : Operational adjustments on analogue composite broadcast VTRs SECTION O: GENERAL 0.1 Scope This technical report defines operational adjustments on analogue composite broadcast V
29、TRs. SECTION 1 : OPERATIONAL ALIGNMENT OF TRANSVERSE-TRACK VTRS 1.1 BU alignment tape The purpose of the alignment tape is to make the checking of the machine as easy as possible and, to this end, a split picture was chosen so that a multiple check could be made on picture and waveform monitor displ
30、ays. The waveforms of the signals before recording are depicted in figure 1. The upper half of the picture consists of the CCIR insertion signal, as specified for line 330, repeated on each line: luminance bar, 2T sine-squared pulse and 5-riser luminance staircase with superimposed sub-carrier. The
31、lower half of the picture consists of a 100/0/75/0 colour-bar signal The sound track carries alternating French and English announcements interrupted by 1 O00 Hz tone at the reference level of 100 nWb/m r.m.s. There is no recording on the cue track. The tape used is Scotch 400 with average character
32、istics. It is supplied in rather long sections and it is anticipated that broadcasting organizations will cut them into short pieces for alignment purposes and will perhaps splice short lengths of their normal video tape stock onto these (see clause 1.3). The complete EBU specifications of the align
33、ment tape for transverse track VTRs appear in EBU document Tech. 3084 I - United Kingdom users have a 100/0/10010 coiour-bar signai. The figures in square brackets refer to the bibliography, annex B, page 61. * Copyright International Electrotechnical Commission Provided by IHS under license with IE
34、CLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/09/2007 03:04:24 MSTNo reproduction or networking permitted without license from IHS -,-,- -12- 1055-1 0 CE1 Les bandes de reglage ont une dure de vie limitee en exploitation et doivent tre manipulees avec soin si lon veut quel
35、les assurent un reglage fidle des magntoscopes pendant une longue Periode. On trouve dans lannexe A des indications quant leur emploi et leur entreposage. II est essentiel de respecter strictement les procdures de manipulation spcifies par les fabricants. a) Moiti suprieure de limage CEI 4 W I b) Mo
36、iti infrieure de limage H CEI47INI Figure 1 - Signaux enregistres sur la bande de rglage de WER 1.2 Rglage de la chane de lecture Le but de la bande de rglage est dajuster le magnetoscope de manire permettre une reproduction optimale dun enregistrement de premire gnration vrifi. La methode consiste
37、reproduire la bande de rglage et faire les corrections ncessaires. On fait ensulte des enregistrements dessai et on rgle les conditions denregistrement jusqu ce que la qualit de reproduction obtenue avec ces enregistrements soit semblable celle obtenue lors de la lecture de la bande de rglage. On su
38、ppose que lon a pralablement vrifi les ttes video pour contrler leur distance par rapport la piste dasservissement et pour sassurer quelles sont coplanaires et en quadrature, et que le dpassement des tQtes a la meme valeur pour chacune delles. Lordre des verifications est le suivant: a) position rel
39、ative des ttes video et de la piste dasservissement; b) position relative du disque porte-tetes et du guide depression; Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/09/2007 03:04:24 M
40、STNo reproduction or networking permitted without license from IHS -,-,- 1055-1 O IEC - 13- V 1 9%. 0.72- 0.58 0.44- 93-, O-. Alignment tapes have a limited operational life and shall be handled with extreme care if they are to provide faithful alignment of VTRs for long periods. Guidance on their u
41、se and storage will be found in annex A. Strict adherence to the manufacturers handling procedures is essential. -,- a) Top half of picture area I I I I l I I I I I I I ,IlIII L 6 1 1 13 15 M 22 24 26 28 31 32 ItC 4Wi91 b) Bottom half of picture area 1 Q3 O O 6 9 12 15 B 21 2427 32 I- H -I IEC 471t9
42、1 Figure 1 - Signals recorded on the EBU alignment tape 1.2 Alignment of the playback chain The objective In using the alignment tape is to adjust the machine so that it will give optimum reproduction of a first-generation verified recording. The process involves playing back the alignment tape whil
43、e making the necessary adjustments and then making trial recordings and adjusting the recording conditions until the quality of reproduction of these recordings is similar to the quality obtained from the alignment tape. It is assumed that the spacing between the video head and the control-track hea
44、d has already been checked and that the video heads are co-planar, in quadrature and have similar tip projections. The order of alignment checks is as follows: a) video head/control-track phase; b) relative positions of headwheel and vacuum guide; Copyright International Electrotechnical Commission
45、Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/09/2007 03:04:24 MSTNo reproduction or networking permitted without license from IHS -,-,- - 14- 1055-1 0 CE1 c) niveau vido; d) linarit vido, cest-dire correction des voies de lecture, rduc
46、tion de la phase et du gain diffrentiels, rglage des commandes denregistrement; e) niveau audio. 1.2.1 Phase du signai dasservissement Sur les magnetoscopes qui permettent dajuster la position des pistes, on rgle gnrale- ment le potentiomtre commandant la phase de la piste dasservissement sur le poi
47、nt qui donne la sortie MF maximale sur Icran dun oscilloscope. II est commode de realiser ce moment-l un contrle visuel de la stabilit dasservissement du cabestan et du disque porte-t pendant cette operation, le moniteur vido est asservi une rfrence externe stable. Linstabilit de phase peut Qtre cause soit par un mauvais fonctionnement de lasservissement, soit par des difficults propres la bande, par exemple une dcoupe incorrecte. On observera simultanment les points de la roue phonique sur un moniteur vido bran- ch la sortie du dem
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