HD 574 S1:1990

SLOVENSKI STANDARD
01-julij-1999
Type B helical video recorders (IEC 60602:1980 + A1:1987)
Type B helical video recorders
Videobandgeräte mit Schrägspuraufzeichnung Typ B
Magnétoscopes à enregistrement hélicoïdal de type B
Ta slovenski standard je istoveten z: HD 574 S1:1990
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
INTERNATIONAL
Première édition
STAN
DARD
First edition
1980-01
Magnétoscopes à enregistrement hélicoïdal
de type B
Type B helical video recorders
© IEC 1980 Droits de reproduction réservés — Copyright - all rights reserved
Aucune partie
de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,
procédé, électronique ou mécanique, y compris la photo- including photocopying and microfilm, without permission in
copie les
et microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
N
PRICE CODE
International Electrotechnical Commission
IEC
MemityHapoctHaH GnewrpoTexHH4ecKaR KOMHCCHR
Pour prix, voir catalogue en vigueur
• • For price, see current catalogue

CONTENTS
Page
FOREWORD
PREFACE 5
Clause
I. Scope 7
2. Object
3. Format description
4. Environment
5. Tape and spools
5.1 Dimensions of magnetic tape for television
5.2 Spools
Magnetic tape properties 11
5.3
6. Mechanical parameters
1 I 6.1 Scanning configuration
Speeds of the tape and of the video-head wheel 13
6.2
Position of the recorded tracks 6.3
7. Electrical parameters 21
7.1 Modulation system
Characteristic frequencies 21
7.2
7.3 Pre-emphasis and de-emphasis 21
7.4 Recording of the audio track
Specification of the recording of the field synchronizing and control signals 7.5
Transmission characteristics of the signal chain APPENDIX A

INTERNATIONAL ELECTROTECHNICAL COMMISSION
TYPE B HELICAL VIDEO RECORDERS
FOREWORD
I) 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.
2) They have the form of recommendations for international use and they are accepted by the National Committees in that sense.
In order to promote international unification, the IEC expresses the wish that all National Committees should adopt
3)
the text of the I EC recommendation for their national rules in so far as national conditions will permit. Any divergence
between the IEC recommendation and the corresponding national rules should, as far as possible, be clearly indicated in
the latter.
PREFACE
This standard has been prepared by Sub-Committee 60B: Video Recording, of IEC Technical
Committee No. 60: Recording.
Drafts were discussed at the meeting held in Budapest in 1978. As a result of this meeting, a draft,
Document 60B(Central Office)29, was submitted to the National Committees for approval under the
Six Months' Rule in September 1978.
The National Committees of the following countries voted in favour of publication:
Japan
Australia
Korea (Democratic People's
Austria
Republic of)
Belgium
Netherlands
Canada
Poland
Czechoslovakia
Romania
Denmark
South Africa (Republic of) Egypt
Finland Spain
Switzerland
France
Turkey
Germany
Italy United Kingdom
United States of America
Other IEC publications quoted in this standard.
and Reproducing Systems.
Publications Nos. 94: Magnetic Tape Sound Recordin g
461: Time and Control Code for Video Tape Recordings.
503: Spools for l in (25.4 mm) Video Magnetic Tape.

—7—
TYPE B HELICAL VIDEO RECORDERS
1. Scope
This standard applies to magnetic video recording and/or reproduction using 25.4 mm (1 in)
tape on type B helical-scan recorders suitable for broadcast applications.
2. Object
The object of this standard is to define the electrical and mechanical characteristics of equipment
which will provide for interchangeability of recordings. The requirements given are related to
525 line-60 field and 625 line-50 field systems.
3. Format description
Two recording heads are used. In 525-60 systems each head records one-fifth of the field and in
625-50 systems each head records one-sixth of the field.
4. Environment
Tests and measurements made on the recorder to check the requirements of this standard shall
be carried out under the following conditions:
Temperature: 23 ± 1 -C
48% to 52%
Relative humidity:
86 kPa to 106 kPa
Barometric pressure:
Conditioning before testing: 24 h
5. Tape and spools
5.1 Dimensions of magnetic tape for television
The magnetic tape used for television recording shall conform to the following dimensions.
TABLE I
Dimensions of magnetic tape
Millimetres Inches
+o.00i
0.998 -ouoi
i Width 25350+ x:°,/
0.0013
Maximum overall thickness 0.032
it
Maximum curvature 1.3 in 1 m 0.051 in 39.4
constraining the tape to lie in a plane under zero
,vote. — The curvature shall be measured b y
tension, and by positioning a straight edge of the specified length as shown in Figure 1.
page 9.
—9
5.2
Spools
5.2.1 Spools shall conform to the requirements of ISO Standard 1860. The preferred reel sizes are listed
in IEC Publication 503: Spools for 1 in (25.4 mm) Video Magnetic Tape. If a friction ring is used,
dimension C shall be:
115+; mm (4.528 +ô in).
ô3ÿ
If provided, the friction ring should not impair spool performance.
5.2.2 A minimum distance of 5 mm (0.2 in) from the tape stack to the spool periphery shall be allowed.
Approximate spool capacities are given in Table IV.
Maximum curvature
1.3 mm (0.051 in)
Tape
Straight edge
1 000 mm (39.4 in)
179/80
FIG. 1. - Measurement of the curvature of the magnetic tape.
Section X — X
180/80
FIG. 2. Spools for television tape.

11 —
TABLE III
TABLE II
Dimension B
Spool dimensions
Inches
Millimetres
Inches Degrees
Dimensions Millimetres
+ 0.5
8.000± 0.010
203.0_0.0
3.000
A 76.")101 T
0.000
- 0.5
9.000+0.010
229.0
4.500±0.010 _ o.o
C 114.0_0:0
0.5
9.750±0.010
248.0_0.0
3250±0.002
D 82.5
1.0
+ 0.00
0 I5
267.0 10.500+ 0.010
0.0
0.219 E 5.60+_ -
0.000
0.00
G 120.0±0.1
0.65 max. 0.025 max.
II
2.5 max. 0.098 max.
J
3.600 min.
K 91.5 min.
6.000 min.
L 153 min.
30.8+0.1 1.212±0.003
M
TABLE IV
Approximate spool capacities
Approximate maximum
Approximate capacity
Diameter of spool
playing time
Feet Minutes
Metres
Inches
Millimetres
8 650
900 3000
229 9
3 700
248 9.75
4600 95
10.5 1400
Magnetic tape properties
5.3
5.3.1 The magnetic coating shall be longitudinally oriented.
X 10 3 km.
5.3? The coercivity shall be more than 30
6. Mechanical parameters
Scanning configuration
6.1
6.1.1 The dimensions of the scanning configuration shall be as specified in Figure 3, page 13, and in
Table V.
13 —
K
Video head 2
K'
Tape motion
FIG. 3. Scanning configuration.
TABLE V
Millimetres Inches
50.33_ 0.000
0.00000
G Drum diameter 1.9815
0.003
-0.000îz
H Tip penetration 0.060 (max.) 0.0024 (max.)
B Video-head angle
180`± 30" measured from gap to gap of video head 1 and 2
i
Control-head angle to centre line 90 ± 15" K-K' to control head gap
y
T;,, Tape tension in Measured between B and C: 2 N± l0%
T„,, Tape tension out Measured between D and E: 2.3 N± 10%
6.2 Speeds of the tape and of the video-head wheel
6.2.1 The nominal linear speed of the tape shall conform with Table VI.
TABLE VI
625 line-50 field system 525 line-60 field system
24.3 cm/s 24.5 cm/s
Nominal linear tape speed
9.567 in/s
9.646 in/s
Nominal rotational speed of head wheel 150 rev/s
150 rev/s
// Tape motion (oxide side up)
Audio 1
^^ : . . . .
Control track -- / ,
Audio
1 ,^'%6::z::3•.`•<:?'•'s>::`:>«::;;i
Switch point
// See detail a
ead
ro
wheel
Video Stop
5y
Track 1
^
Se e detai/ b
l
Track 2
0 0 A BCDFE
180, wr
ap
K
Audio 3
r
ii
N P
Switch point —
Reference edge
.41 T
182/80
FIG. 4. --- Tape format.
Control track
Centreline of control
Centreline of
track head gap
edit pulse
Z
xo
183/80
Detail a.
184/80
Detail b: End of recorded video track
(PAL/SECAM).
185/80
Detail b: End of recorded video track (NTSC).
FIG. 4 (continued).
TABLE VII
Dimensions of video, audio and control track

Millimetres Inches
Dimensions
mit 0.927
23.55
b" i
A
max. 23.65 0.931
Control track
0.942
min. 23.95
B
max. 24.06 0.947
C min. 24.35 0.959
b
max. 24.45 j 0.963
Audio 1 track
0.990
min. 25.15
t
D
max. 25.26 0.994
j
min. 22.35 0.880
E, b
max. 22.45 0.884
Audio 2 track
0.911
F t min. 23.15
max. 23.26 0.916
i
Î
0.006
min. 0.15
b
H
max. 0.25 0.010
Audio 3 track
0.037
min. 0.95
t
max. 1.05 0.041
ref. 12.70 0.500
Centre of video tape
K
min. 2.84 0.112
L Position of control head
max. 2.88 0.113
min. 232.0 9.134
Position of audio heads
M
9.174 I
max. 233.0
min. 1.18 0.046
N b
Full video width
t max. 22.19 0.874
O
b ref. 1.82 0.070
Video width 180°
t i ref. 21.55 0.848
Q
I
ref. 0.200 0.0079
R Video track pitch
0.0061
min. 0.155
S Video track width
max. 0.165 0.0065
V1 nn!_ a 7]7
Switch point video track 2
T
max. 82.121 3.233
min. 5.523 0.217
Switch point video track 1
max. 5.533 0.218
ap and centre
11 . Distance between control track head- g
ref. 0.040 0.0016
ed it pulse at 180 switch point
14.434"
Scannin angle
g
14.289°
625 line-50 field system
Video track angle Vid
14.288°
525 line-60 field system
is the dimension from the reference edge to the bottom of the record.
* b
t is the dimension from the reference ed ge to the top of the record.
The audio and cue recordings shall be so positioned along the tape as to lead the associated video
M.
information by 232.5 ± 0.5 mm (9.154 ± 0.020 in) as indicated in Figure 4, page 15, dimension

-- 21 —
7. Electrical parameters
7.1 Modulation system
The video information shall be recorded in the form of an r.f. signal frequency modulated by the
video signal. The instantaneous frequencies of the r.f.
...