Helical-Scan video tape cassette system using 8 mm magnetic tape - 8 mm video - Part 1: General specifications

Transcription

1 EESTI STANDARD EVS-EN :2002 Helical-Scan video tape cassette system using 8 mm magnetic tape - 8 mm video - Part 1: General specifications EESTI STANDARDIKESKUS

2 EESTI STANDARDI EESSÕNA Käesolev Eesti standard EVS-EN :2002 sisaldab Euroopa standardi EN :1994 ingliskeelset teksti. NATIONAL FOREWORD This Estonian standard EVS-EN :2002 consists of the English text of the European standard EN :1994. Standard on kinnitatud Eesti Standardikeskuse käskkirjaga ja jõustub sellekohase teate avaldamisel EVS Teatajas. This standard is ratified with the order of Estonian Centre for Standardisation dated and is endorsed with the notification published in the official bulletin of the Estonian national standardisation organisation. Standard on kättesaadav Eesti standardiorganisatsioonist. The standard is available from Estonian standardisation organisation. ICS Standardite reprodutseerimis- ja levitamisõigus kuulub Eesti Standardikeskusele Andmete paljundamine, taastekitamine, kopeerimine, salvestamine elektroonilisse süsteemi või edastamine ükskõik millises vormis või millisel teel on keelatud ilma Eesti Standardikeskuse poolt antud kirjaliku loata. Kui Teil on küsimusi standardite autorikaitse kohta, palun võtke ühendust Eesti Standardikeskusega: Aru 10 Tallinn Eesti; Telefon: ; E-post: Right to reproduce and distribute Estonian Standards belongs to the Estonian Centre for Standardisation No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, without permission in writing from Estonian Centre for Standardisation. If you have any questions about standards copyright, please contact Estonian Centre for Standardisation: Aru str 10 Tallinn Estonia; Phone: ;

3 EUROPEAN STANDARD EN NORME EUROPJENNE EUROPÄISCHE NORM April 1994 UDC Supersedes HD 531 Sl : 1989 Descriptors: Electroacousties, video recording, recording apparatus, video tape recorders, magnetie tapes, cassettes for magnetic tapes, interchangeability, electrieal properties, mechanical properties, recording charaeteristies English version Helical-scan video tape cassette system using 8 mm magnetic tape - 8 mm Video Part 1: General specifications (IEC 843-1: 1993) Systme de magnstoscope ä cassette ä Video-Bandkassettensystem mit balayage h1ieoda1 utilisant la bande Schrägspuraufzeichnung auf magntique de 8 mm - Vido 8 mm Magnetband 8 mm - Video 8 Partie 1: Gn&a1itis Teil 1: Allgemeine Festlegungen (CEI 843-1: 1993) (IEC 843-1: 1993) This European Standard was approved by CENELEC on CENELEC 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 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 Secretariat has the same status as the official versions. CENELEC members are the national electroteehnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electroteehnical Standardization Comitd Europen de Normalisation Eleetrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B Brussels 1994 Copyright reserved to CENELEC members Ref. No. EN : 1994 E

4 Page 2 EN : 1994 Foreword The text of document 60B (CO) 148, as prepared by Sub-Gommittee 60B: Video recording, of IEC Technical Committee 60: Recording, was submitted to the IEC-CENELEG parallel vote in March The reference doeument was approved by CENELEC as EN on 8 March This European Standard replaces HD 531 S1 : The fo1iowing dates were fixed: - latest date of publication of an identical national standard (dop) latest date of withdrawal of conflieting national standards (dow) For produets which have eomplied with HD 531 S1 : 1989 before , as shown by the manufacturer or by a certifieation body, this previous standard may eontinue to apply for production until Annexes designated 'normative' are part of the body of the standard. Annexes designated 'informative' are given only for information. In this standard, annex A is informative and annex ZA is normative.

5 Page 3 EN : 1994 CONTENTS Page Glause SECTION 1:GENERAL 1.1 Scopeand object Normativereferences Environmental conditions... 7 SECTION 2: VIDEO TAPE 2.1 Types of magnetic tape and reterence tape Physical properties ot the tape Magnetic tape width Magnetic tape width tluctuation Magnetic tape thickness Transparency of the magnetic tape Magnetic properties of the tape Recording characteristics ot the tape Video characteristics of the tape Auxiliary audio characteristics SECTION 3: VIDEO TAPE CASSETTE 3.1 Mechanical parameters Dimensions ot the cassette Datum planes Z, X and Y Tape winding Window and label Withdrawal torce Support areas A, B, C and D Cassette holding areas lncorrect insertion protection Accidental erasure protection Recognition holes Changergrip Lid Reels Reet spring....13

6 Page 4 EN : 1994 Clause Page 3.2 Magnetic tape length Leader and trailer tape Automatic stop Dimensions of the leader and trailer tape Transparency of the leader and trailer tape Splicing Cassette designation SEGTION 4: VIDEO CASSETTE RECORDERS 4.1 Tapespeed line - 60 field system line - 50 field system Drumdiameter Tapetension lnclinedazimuth angle Track configuration and dimensions SECTION 5: RECORDING CHARACTERISTICS OF THE VIDEO SIGNAL 5.1 Video recording system Block diagram for video recording Frequency spectrum allocation of recording signals Recorcling of the luminance component Luminance filter Pre-emphasis and clipping Modulation characteristics FM high-pass filter Recording current Recording of the chrominance component Recording method Pre-emphasis Conversion method Recording equalization Recording current Colour burst amplitude Time difference between luminance and chrominance... 35

7 Page 5 BS EN : 1994 SECTION 6: RECORDING CHARACTERISTICS OF THE AUDIO SIGNAL Clause Page 6.1 Audio recording system FM audio signal recording Carrier frequency Reference deviation Maximum deviation Recording FM signal channel bandwidth Recording current Noise reduction Others PCM audio signal recording Audio signal format PCM signal format PCM signal train Error correction Error detection Modulation Recording conditions Noise reduction Audio signal recording on the auxiliary audio track Reference level Playback equalization Noise reduction Noise reduction system Specifications for FM and PCM audio Specifications for AUX audio SECTION 7: CHARACTERISTICS OF THE TRACKING SYSTEM 7.1 Tracking pilot signal recording Tracking pilot signal frequencies Recording current Recording head positioning pilot signal recording (optional) The burst pilot signal write and read area The burst pilot signal frequency Recording current... 55

8 Page 6 EN : 1994 Clause SECTION 8: AUXILIARY TRACK FOR CUE 8.1 Recording on auxiliary cue track...55 Annex A - Reference tape and sub-reference tape...56 Figures Tables...26 Page Annex ZA Other international publications quoted in this standard with the reference of this relevant European publications... 57

9 Page 7 EN : 1994 HELICAL-SCAN VIDEO TAPE CASSETTE SYSTEM USING 8 mm MAGNETIC TAPE - 8 mm VIDEO Part 1: General specifications SECTION 1: GENERAL 1.1 Scope and object This part of IEC 843 applies to magnetic video recording and/or piayback with 8 mm tape cassettes on two-head helical-scan video cassette recorders, suitable for the recording and/or playback ot monochrome as well as colour television signals. The object 01 this part is to define the electrical and mechanical characteristics of equipment which will provide for interchangeability of recorded cassettes. This will include the ability to reproduce recordings made on both types of magnetic tapes defined in section 2. The requirements given are related to 525 line - 60 field or 625 line - 50 field systems, NTSC and PAL respectively. 1.2 Normattve reterences The following normative document contains provisions which, though reference in this text, constitute provisions of this part of IEC 843. At the time of publication, the edition indicated was valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 843 are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. Members of IEC and ISO maintain registers of currently valid lnternational Standards. IEC 843-2: 1993, Helical-scan video tape cassette system using 8 mm magnetic tape - 8 mm video - Part 2: PCM multi-track audio systems IEC 843-3: 1993, Helical-scan video tape cassette system using 8 mm magnetic tape - 8 mm video - Part 3: High-band specifications for 8 mm video - Hi 8 l EC : 199 l, Reference tapes for video tape recorder systems 1.3 Envlronmental conditions Tests and measurements made on the system to check the requirements of this standard shaii be carried out under the following conditions: Temperature: 20 oc ± 10C Relative humidity: (50 ± 2) % Air pressure: 86 kpa to 106 kpa Conditioning before testing: 24 h