EN 60774-3:1993

Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS - Part 3: S-VHS

Applies to magnetic video recording on 12,65 mm (0,5 in) wide tape using the wide band VHS recording system.

Video-Bandkassettensystem mit Schrägspuraufzeichnung auf Magnetband 12,65 mm (0,5 in) VHS-Format - Teil 3: S-VHS

Système de magnétoscope à cassette à balayage hélicoïdal utilisant la bande magnétique de 12,65 mm (0,5 in) format VHS - Partie 3: S-VHS

S'applique aux systèmes d'enregistrements magnétique vidéo à bande d'une largeur de 12,65 mm (0,5 in) utilisant le format d'enregistrement VHS à bande large.

Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS -- Part 3: S-VHS (IEC 60774-3:1993)

General Information

• Status: Published
• Publication Date: 23-Nov-1993
• Withdrawal Date: 30-Sep-1994
• 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: 24-Nov-1993
• Completion Date: 24-Nov-1993
• Ref Project: SIST EN 60774-3:1999 - Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS -- Part 3: S-VHS

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-1999
Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on
type VHS -- Part 3: S-VHS (IEC 60774-3:1993)
Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type
VHS -- Part 3: S-VHS
Video-Bandkassettensystem mit Schrägspuraufzeichnung auf Magnetband 12,65 mm
(0,5 in) VHS-Format -- Teil 3: S-VHS
Système de magnétoscope à cassette à balayage hélicoïdal utilisant la bande
magnétique de 12,65 mm (0,5 in) format VHS -- Partie 3: S-VHS
Ta slovenski standard je istoveten z: EN 60774-3:1993
ICS:
33.160.40 Video sistemi Video systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME
CEI
INTERNATIONALE IEC
774-3
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
1993-10
Système de magnétoscope à cassette
à balayage hélicoïdal utilisant la bande
magnétique de 12,65 mm (0,5 in) format VHS
Partie 3:
S-VHS
Helical-scan video tape cassette system using
12,65 mm (0,5 in) magnetic tape on type VHS
Part 3:
S-VHS
© CEI 1993 de reproduction réservés — Copyright — all rights reserved
Droits
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée
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cédé, électronique ou mécanique, y compris la photocopie et including photocopying and microfilm, without permission
les
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Pour prix, voir catalogue en vigueur
• •
For price, see current catalogue

774-3 ©IEC:1993 – 3 –
CONTENTS
Page
FOREWORD 7
SECTION 1: GENERAL
Clause
1.1 Scope 9
1.2 Normative references 9
SECTION 2: S-VHS VIDEO TAPE CASSETTE
2.1 Mechanical parameters 11
2.1.1 Cassette identification 11
2.1.2 Dimensions, reel, front cover, etc. 11
2.2 Name 11
SECTION 3: COMPACT S-VHS VIDEO TAPE CASSETTE
3.1 Mechanical parameters
3.1.1 Cassette identification 11
3.1.2 Dimensions, reel, front cover, E-value, etc.
3.2 Name 11
SECTION 4: TAPE CHARACTERISTICS OF S-VHS AND
COMPACT S-VHS VIDEO CASSETTES
4.1 Dimensions of magnetic tape 13
4.2 Magnetic tape properties 13
4.2.1 Coercivity 13
4.2.2 Others 13
4.3 Reference tape 13
4.4 RF recording current characteristics 13
4.5 RF playback output 13
4.6 Leader tape and trailer tape 13
SECTION 5: S-VHS VIDEO CASSETTE RECORDERS
5.1 Tape speed 15
5.2 Others 15
5.3 Track configuration and dimensions 15
5.3.1 Record locations 15
5.3.2 Others 15
– 4 – 774-3 ©CEI:1993
Pages
SECTION 6: CARACTÉRISTIQUES D'ENREGISTREMENT
Articles
6.1 Enregistrement en MF de la composante de luminance 14
6.1.1 Préaccentuation auxiliaire et préaccentuation principale 14
6.1.2 Niveau d'écrêtage 16
6.1.3 Caractéristiques de modulation 16
6.1.4 Niveau d'enregistrement 16
6.2 Enregistrement du signal de chrominance 525 lignes-60 trames 16
6.2.1 Niveau de la composante de luminance dans le signal de chrominance
convertie 16
6.2.2 Niveau d'enregistrement 18
6.3 Enregistrement du signal de chrominance 625 lignes-50 trames 18
6.3.1 Niveau d'enregistrement 18
6.3.2 Signal de salve pilote 18
6.3.3 Position de commutation de phase du signal couleur de
porteuse convertie 18
6.3.4 Sortie des signaux Y et C séparés 20
6A Enregistrement du signal audio 20
6.5 Enregistrement audio MF 20
6.5.1 Enregistrement audio MF en mode SP 20
6.5.2 Géométrie de piste audio MF pour les modes EP et LP 20
6.6 Enregistrement du signal d'asservissement 22
Figures 26
Annexes
A Cassette de référence 32
B Renseignements concernant les commandes 34

774-3©IEC:1993 - 7 -
INTERNATIONAL ELECTROTECHNICAL COMMISSION
HELICAL-SCAN VIDEO TAPE CASSETTE SYSTEM
USING 12,65 mm (0,5 in) MAGNETIC TAPE
ON TYPE VHS
Part 3: S-VHS
FOREWORD
1)
The IEC (International Electrotechnical Commission) is a world-wide organization for standardization
comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to
promote international cooperation on all questions concerning standardization in the electrical and
electronic fields. To this end and in addition to other activities, the IEC publishes International Standards.
Their preparation is entrusted to technical committees; any IEC National Committee interested in
the subject dealt with may participate in this preparatory work. International, governmental and
non-governmental organizations liaising with the !EC also participate in this preparation. The IEC
collaborates closely with the International Organization for Standardization (ISO) in accordance with
conditions determined by agreement between the two organizations.
2)
The formal decisions or agreements of the IEC on technical matters, prepared by technical committees on
which all the National Committees having a special interest therein are represented, express, as nearly as
possible, an international consensus of opinion on the subjects dealt with.
3)
They have the form of recommendations for international use published in the form of standards, technical
reports or guides and they are accepted by the National Committees in that sense.
4)
In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
International standard IEC 774-3 has been prepared by sub-committee 60B: Video record-
ing, of IEC technical committee No. 60: Recording.
The text of this standard is based on the following documents:
DIS Report on Voting
60B(CO)143 60B(CO)163
Full information on the voting for the approval of this standard can be found in the Voting
Repo rt indicated in the above table.
IEC 774 (second edition) consists of the following pa rts, under the general title: Helical-
scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS.
- Part 1: General
- Part 2: FM audio recording
- Part 3: S-VHS
- Part 4: PCM audio recording (in preparation)
Annex A forms an integral pa rt of this standard.
Annex B is for information only.

774-3©IEC:1993 - 9 -
HELICAL-SCAN VIDEO TAPE CASSETTE SYSTEM
USING 12,65 mm (0,5 in) MAGNETIC TAPE
ON TYPE VHS
Part 3: S-VHS
SECTION 1: GENERAL
1.1 Scope
This part of International Standard IEC 774 (second edition) applies to magnetic video
recording on 12,65 mm (0,5 in) wide tape using the wide band VHS recording system. The
basic S-VHS video cassette and the compact S-VHS video cassette are defined as well as
the necessary parameters and characteristics for the recordings. The requirements relate
to the 525 line-60 field and 625 line-50 field TV systems.
Equipment manufactured according to this part of IEC 774 and tapes recorded following
this part provide the necessary interchangeability of recorded video cassettes.
1.2 Normative references
The following normative documents contain provisions which, through reference in this
text, constitute provisions of this pa rt
of IEC 774. At the time of publication of this standard,
the editions indicated were valid. All normative documents are subject to revision, and
parties to agreements based on this part of IEC 774 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below.
Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 756: 1991, Non-broadcast video tape recorders - Time base stability.
IEC 774: 1983,
Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic
tape on type VHS
IEC 774-1: 199x, Helical-scan video tape cassette system using 12,65 mm (0,5 in)
magnetic tape on type VHS Part 1: General
IEC 774-2: 199x,
Helical-scan video tape cassette system using 12,65 mm (0,5 in)
magnetic tape on type VHS - Part 2: FM audio recording (under consideration)
IEC 1041-1: 1990,
Non-broadcast video tape recorders - Methods of measurement -
Part 1: General video (NTSC/PAL) and audio (longitudinal) characteristics
IEC 1041-3: 199x,
Non-broadcast video tape recorders - Methods of measurement -
Part 3: Audio characteristics for FM recording (under consideration)
IEC 1054: 1991,
Helical-scan video tape cassette system using 12,65 mm (0,5 in)
magnetic tape on type VHS - FM audio recording

774-3 ©IEC:1993 – 11 –
SECTION 2: S-VHS VIDEO TAPE CASSETTE
2.1 Mechanical parameters
2.1.1 Cassette identification
S-VHS video cassettes shall have an identification hole (ID hole) defined in figure 1.
2.1.2 Dimensions, reel, front cover, etc.
Other mechanical parameters except 2.1.1 above, shall conform to IEC 774-1.
2.2 Name
The following type name shall be used for S-VHS video cassettes.
ST-XXX for 525 line-60 field.
SE-XXX for 625 line-50 field. (XXX indicates tape length in minutes.)
The indication of tape length in minutes shall conform to IEC 774-1.
SECTION 3: COMPACT S-VHS VIDEO TAPE CASSETTE
3.1 Mechanical parameters
3.1.1 Cassette identification
Compact S-VHS video cassettes shall have an identification hole (ID hole) defined in
figure 2.
3.1.2 Dimensions, reel, front cover, E-value, etc.
Other mechanical parameters except item 3.1.1 above, shall conform to IEC 774-1.
3.2 Name
The following type name shall be used for the compact S-VHS video cassettes.
ST-CXX for 525 line-60 field.
SE-CXX for 625 line-50 field. (XX indicates tape length in minutes.)
The indication of tape length in minutes shall conform to IEC 774-1.

774-3 ©IEC:1993 - 13 -
SECTION 4: TAPE CHARACTERISTICS OF S-VHS AND
COMPACT S-VHS VIDEO CASSETTES
4.1 Dimensions of magnetic tape
Regarding the dimensions of magnetic tape, IEC 774-1 shall apply.
4.2 Magnetic tape properties
4.2.1 Coercivity
The coercivity shall be approximately 70 x 10 3 A/m.
4.2.2 Others
Regarding other items such as type of magnetic tape, and magnetic orientation, IEC 774-1
shall apply.
4.3 Reference tape
The reference tape numbered SRT-1 is applicable.
Details are described later in annex A.
4.4 RF recording current characteristics
The optimum recording current shall be within ±10 % with reference to the standard
recording current. The standard recording current is defined at 6,5 MHz as the value which
is necessary to obtain the maximum output signal level for the reference tape SRT-1.
RF
4.5 playback output
When 6,5 MHz sine wave is recorded with standard recording current and the output of the
RF playback
frequency sine wave is measured, it should be as follows with respect to the
output of the reference tape.
RF playback output: -1 dB or more at 6,5 MHz.
4.6 Leader tape and trailer tape
The leader and trailer tape for S-VHS and compact S-VHS video cassettes shall conform
to IEC 774-1.
774-3 © I EC:1993 – 15 –
SECTION 5: S-VHS VIDEO CASSETTE RECORDERS
5.1 Tape speed
TV system
Standard speed (SP mode) Low speed (EP or LP mode)
525 line-60 field 33,35 mm/s ±0,5 % EP mode: 11,12 mm/s ±0,5 %
625 line-50 field
23,39 mm/s ±0,5 % LP mode: 11,70 mm/s ±0,5 %
The EP (Extended Play) mode is applicable only to 525 line-60 field TV system and the LP
(Long Play) mode, only to 625 line-50 field TV system.
5.2 Others
Regarding the drum diameter, tape tension, and inclined azimuth angle, IEC 774-1 shall
apply.
5.3 Track configuration and dimensions
5.3.1 Record locations
The track configuration and dimensions for EP and LP modes shall be in accordance with
figure 3, and table 2. Regarding SP mode, IEC 774-1 shall apply.
5.3.2 Others
Regarding other items such as switching position, video signal overlap, and the relation-
ship between the video track and the video signal field, IEC 774-1 shall apply.
SECTION 6: RECORDING CHARACTERISTICS
6.1 FM recording of luminance component
6.1.1 Sub pre-emphasis and main pre-emphasis
The luminance signal shall be sub pre-emphasized and main pre-emphasized. The
characteristics of the sub pre-emphasis are shown in table 3. Regarding the charac-
teristics of the main pre-emphasis, IEC 774-1 shall apply.

- 17 -
774-3©IEC:1993
6.1.2 Clipping levels
Clipping levels are shown below. The level from sync tip to peak white is 100 %.
White clipping level: (210 ± 10) % measured from sync tip.
Dark clipping level: (-70 ± 10) % measured from sync tip.
6.1.3 Modulation characteristics
FM carrier frequencies corresponding to reference video levels shall be as shown in the
following table 1.
Table 1 - FM carrier frequency
525 line-60 field, 625 line-50 field
Reference white level 7,0 MHz ± 0,1 MHz
Reference sync level
5,4 MHz ± 0,1 MHz
Frequency deviation, white to sync 1,6 MHz ± 0,1 MHz
The FM carrier shall be interleaved in the EP mode for 525 line-60 field, and in both of the
SP and the LP modes for 625 line-50 field.
In these modes, the FM carrier frequency recorded by the channel-1 video head
shall be fh/2 higher than that of channel-2. (For 525 line-60 field, fh=15,734 kHz, and
for 625 line-50 field, fh=15,625 kHz.)
6.1.4 Recording level
The recording current shall have the optimum value at all frequencies within the entire FM
carrier range, as defined in table 1.
NOTE - Optimum recording current is the recording current value which is necessary to obtain the
maximum output signal level during playback.
6.2 525 line-60 field chrominance signal recording
Regarding all items except those stated below, IEC 774-1 shall apply.
6.2.1 Luminance component level in the converted signal
chrominance
The amplitude of th
...