EN 60712:1994

Helical-scan video-tape cassette system using 19 mm (3/4 in) magnetic tape, known as U-format

Applies to magnetic video recording and/or playback with 19 mm (3/4 in) tape cassettes on two-head helical-scan videocassette recorders, suitable for recording and/or playback of monochrome as well as colour television programmes. Gives characteristics necessary to permit the interchangeability of cassettes.

Video-Bandkassettensystem mit Schrägspuraufzeichnung auf Magnetband 19 mm, bekannt m-als U-Format

Système à cassette à bande vidéo à balayage hélicoïdal utilisant la bande magnétique de 19 mm (3/4 in), d'appellation format-U

S'applique à l'enregistrement magnétique et/ou à la lecture de cassettes à bande de 19 mm (3/4 in) pour enregistreurs à cassette à deux têtes et à balayage hélicoïdal convenant à l'enregistrement et/ou à la lecture de programmes de télévision monochrome aussi bien que de programmes couleur. Donne des caractéristiques, dimensionnelles et autres, nécessaires pour permettre l'interchangeabilité des cassettes.

Helical-scan video-tape cassette system using 19 mm (3/4 in) magnetic tape, known as U-format (IEC 60712:1993)

General Information

• Status: Published
• Publication Date: 27-Sep-1994
• Withdrawal Date: 14-Jul-1995
• ICS: 33.160.40 - Video systems
• Technical Committee: CLC/TC 100X - Audio, video and multimedia systems and equipment and related sub-systems
• Drafting Committee: IEC/TC 100 - IEC_TC_100
• Parallel Committee: IEC/TC 100 - IEC_TC_100
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 28-Sep-1994
• Completion Date: 28-Sep-1994
• Ref Project: SIST EN 60712:1999 - Helical-scan video-tape cassette system using 19 mm (3/4 in) magnetic tape, known as U-format

Relations

• Amended By: EN 60712:1994/A1:1994 - Helical-scan video-tape cassette system using 19 mm (3/4 in) magnetic tape, known as U-format
• Effective Date: 28-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60712:1999
01-april-1999
Helical-scan video-tape cassette system using 19 mm (3/4 in) magnetic tape,
known as U-format (IEC 60712:1993)
Helical-scan video-tape cassette system using 19 mm (3/4 in) magnetic tape, known as
U-format
Video-Bandkassettensystem mit Schrägspuraufzeichnung auf Magnetband 19 mm,
bekannt m-als U-Format
Système à cassette à bande vidéo à balayage hélicoïdal utilisant la bande magnétique
de 19 mm (3/4 in), d'appellation format-U
Ta slovenski standard je istoveten z: EN 60712:1994
ICS:
33.160.40 Video sistemi Video systems
SIST EN 60712:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60712:1999

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SIST EN 60712:1999

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SIST EN 60712:1999

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SIST EN 60712:1999

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SIST EN 60712:1999

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SIST EN 60712:1999
NORME CEI
INTERNATIONALE I EC
712
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
1993-06
Système à cassette à bande vidéo à balayage
hélicoïdal utilisant la bande magnétique
de 19 mm (3/a in), d'appellation format-U
Helical-scan video-tape casse tte system
using 19 mm (34 in) magnetic tape,
known as U-format
CEI 1993 réservés — Copyright — all rights reserved
© Droits de reproduction
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque fourre que ce soit et par aucun pro- any form or by any means, electronic or mechanical,
including photocopying and microfilm, without permission
cédé, électronique ou mécanique, y compris la photocopie et
in writing from the publisher.
les microfilms, sans l'accord écrit de l'éditeur.
Bureau Central de la Commission Electrotechnique Inte rnationale 3, rue de Varembé Genève, Suisse
Commission Electrotechnique Internationale CODE PRIX
X
International Electrotechnical Commission
PRICE CODE
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IEC
Pour prix, voir catalogue en vigueur
• •
For price, see current catalogue

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SIST EN 60712:1999
712 ©IEC:1993 – 3 –
CONTENTS
Page
FOREWORD 9
INTRODUCTION 11
Clause
CHAPTER 1: SPECIFICATIONS FOR BASIC SYSTEM
SECTION 1: GENERAL
1 Scope and object 13
2 Normative references 13
3 Environment 13
3.1 Testing environment 13
3.2 Operation environment 15
SECTION 2: VIDEO-TAPE CASSETTE
4 Mechanical parameters 15
4.1 Dimensions of cassette 15
4.2 Tape path and guidance 15
4.3 Tape winding 15
4.4
Label and window area 15
4.5
Withdrawal force 15
4.6 Guiding groove 15
4.7
Safety cap and safety hole 15
4.8 Automatic stop 17
4.9 Cassette support areas 17.
4.10 Reels 17
SECTION 3: VIDEOCASSETTE RECORDERS
5 Mechanical parameters 17
5.1 Type of videocassette recorder 17
5.2 Reel spindle of videocassette recorder
17
5.3 Back tension 17
5.4 Audio and control head position 19
5.5 Audio and control head dimensions 19
5.6 Audio and control-track head position 19
5.7 Time-code head position 19
5.8
Tolerances on audio and control heads and time-code head
(U-matic H-format) 19
5.9 Gap azimuth 21
6 Tape speed 21

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SIST EN 60712:1999
712 ©IEC:1993 – 5 –
Clause Page
7 Track configuration and dimensions 21
7.1 Video track width (U-matic H-format) 23
7.2 Video guard-band width 23
7.3 Location of address track 23
7.4 Switching position between two video heads 23
8 Recording characteristics 23
SECTION 4: TAPE CHARACTERISTICS
9 Type of magnetic tape 25
10 Construction and dimensions of the tape 25
10.1 Magnetic tape thickness 25
10.2 Magnetic tape width 25
10.3 Leader tape and trailer tape thickness 25
10.4 Leader tape and trailer tape length 25
10.5 Splicing 25
11 Magnetic tape properties 27
11.1 Magnetic orientation 27
11.2 Coercivity 27
SECTION 5: RECORDING CHARACTERISTICS
12 Luminance channel 27
12.1 Modulation system 27
12.2 Recording current 27
12.3 Characteristic frequencies 29
12.4 Pre-emphasis 31
12.5 Recording frequency bandwidth 33
12.6 White clipping level 33
13 Audio signal channels 33
13.1 Audio recording characteristic 33
13.2 Optimum audio bias current 33
13.3 Use of the audio tracks 35
13.4 Recorded tape flux characteristics 35
14 Control signal channel 35
14.1 Control signal polarity 35
14.2 Waveform of recording current 37
14.3 Control signal level 37
14.4 Time-code recording 37
T1 2 14.5 Duty cycle /T 37
15 Chrominance channel 37
15.1 Modulation system 39
15.2 Chrominance signal bandwidth 39
15.3 Recording signal spectrum 39

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SIST EN 60712:1999
712 ©I EC:1993 – 7
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