SIST EN 61179:1999
(Main)Helical-scan digital composite video cassette recording system using 19 mm magnetic tape, format D2 (NTSC, PAL, PAL-M)
Helical-scan digital composite video cassette recording system using 19 mm magnetic tape, format D2 (NTSC, PAL, PAL-M)
Specifies the content, format and recording method of the data blocks forming the helical records of the tape containing video, audio and associated data using the 19 mm type D-2 cassette. In addition, this document specifies the content, format and recording method of the longitudinal record containing tracking information for the scanning head associated with the helical records.
Videokassettensystem mit Schrägspuraufzeichnung digitaler Composite-Signale auf Magnetband 19 mm, D2-Format (NTSC, PAL, PAL-M)
Système de magnétoscope numérique à chrominance composite à cassette à balayage hélicoïdal utilisant la bande magnétique de 19 mm, format D2 (NTSC, PAL, PAL-M)
Définit le contenu, le format et les méthodes d'enregistrement des blocs de données constituant les enregistrements hélicoïdaux sur une bande comportant des informations audio, vidéo et des données associées sur des cassettes de 19 mm, type D-2. De plus, cette norme définit le contenu, le format et la méthode d'enregistrement longitudinal des informations de suivi de piste pour la tête de balayage associé aux enregistrements hélicoïdaux.
Helical-scan digital composite video cassette recording system using 19 mm magnetic tape, format D2 (NTSC, PAL, PAL-M) (IEC 61179:1993)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-1999
Helical-scan digital composite video cassette recording system using 19 mm
magnetic tape, format D2 (NTSC, PAL, PAL-M) (IEC 61179:1993)
Helical-scan digital composite video cassette recording system using 19 mm magnetic
tape, format D2 (NTSC, PAL, PAL-M)
Videokassettensystem mit Schrägspuraufzeichnung digitaler Composite-Signale auf
Magnetband 19 mm, D2-Format (NTSC, PAL, PAL-M)
Système de magnétoscope numérique à chrominance composite à cassette à balayage
hélicoïdal utilisant la bande magnétique de 19 mm, format D2 (NTSC, PAL, PAL-M)
Ta slovenski standard je istoveten z: EN 61179:1993
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
INTERNATIONAL
Première édition
STAN
DARD
First edition
1993-02
Système de magnétoscope numérique
à chrominance composite à cassette
à balayage hélicoïdal utilisant la bande
magnétique de 19 mm, format D2
(NTSC, PAL, PAL-M)
Helical-scan digital composite video cassette
recording system using 19 mm magnetic tape,
format D2 (NTSC, PAL, PAL-M)
© IEC 1993 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 et les microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
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1179 ©IEC:1993 – 3 –
CONTENTS
Page
FOREWORD 7
INTRODUCTION 9
SECTION 1: GENERAL
Clause
1.1 Scope 15
1.2 Normative references 15
1.3 Definitions, symbols and abbreviations 17
1.4 Environment and test conditions, reference tape and calibration tape 17
SECTION 2: VIDEOTAPE-CASSETTE
2.1 Mechanical parameters 21
2.2 Videotape specification 75
SECTION 3: HELICAL RECORDINGS
3.1 Tape speed 77
3.2 Record location and dimensions
3.3 Helical track record curvature, tolerance zones, centre lines 87
3.4 Relative positions of recorded signals
3.5 Gap azimuth
3.6 Transport and scanner
SECTION 4: PROGRAM TRACK DATA ARRANGEMENT
4.1 Introduction 99
4.2 Labelling convention 99
4.3 Sector details 103
4.4 Edit gaps 117
4.5 Channel code 119
SECTION 5: VIDEO INTERFACE
5.1 Encoding parameters 123
5.2 Parallel digital signal inte rface 143
5.3 Serial digital signal inte rface 153
1179 ©IEC:1993 - 5 -
SECTION 6: AUDIO INTERFACE
Page
Clause
6.1 Encoding parameters
6.2 Digital signal interface
SECTION 7: VIDEO PROCESSING
7.1 Recorded data
7.2 Intersector distribution
7.3 Intrasector shuffling
7.4 Sector array
7.5 Outer code error protection
SECTION 8: AUDIO PROCESSING
8.1 Introduction
8.2 Source coding
187 8.3 Source processing
8.4 Auxiliary words
8.5 Outer error protection
8.6 Inner protection and channel coding
8.7 Order of transmission to inner coding
8.8 Order of audio sectors
SECTION 9: LONGITUDINAL TRACKS
9.1 General
9.2 Relative timing
9.3 Control track
9.4 Cue record 217
9.5 Time code record
Annexes
A Audio levels
B Cross-tape track measurement technique
C Examples of error correcting codes
1179 ©I EC:1993 -
7 -
INTERNATIONAL ELECTROTECHNICAL COMMISSION
HELICAL-SCAN DIGITAL COMPOSITE
VIDEO CASSETTE RECORDING SYSTEM USING
19 mm MAGNETIC TAPE, FORMAT D2
(NTSC, PAL, PAL-M)
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 IEC 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 1179 has been prepared by sub-committee 60B: Video record-
ing, of IEC technical committee 60: Recording.
The text of this standard is based on the following documents:
DIS
Report on Voting
60B(CO)144
60B(CO)157
Full information on the voting for the approval of this standard can be found in the report
on voting indicated in the above table.
Annexes A, B and C form an integral part of this standard.
Annex D is for information only.
1179 ©IEC:1993 - 9 -
INTRODUCTION
The purpose of International Standard IEC 1179 is to define the electrical and mechanical
characteristics of equipment which permits the interchangeability of 19 mm cassettes
containing digitally recorded composite video programs.
The requirements given relate to 525-line composite TV signals (NTSC, PAL-M) with a
frame frequency of 29,97 Hz nominal, and to 625-line composite TV signals (PAL) with a
frame frequency of 25 Hz.
One video channel and four independent audio channels are recorded in a digital format.
The video signal may be input or output in either analog or digital format. The audio
signals may also be input or output in either analog or digital format. In addition, a cue
audio signal is recorded in analog format.
Figures 1 and 2 show a block diagram of the processes involved in the recorder.
11 -
1179 ©IEC:1993 -
AUDIO
Outer Audio
Analog/ Audio
Analog data --► ECC -. data
digital
coder shuffle
interface block
Digital
VIDEO
Channel Outer I ntra-
Analog/
Analog --OP.
DEMUX -► ECC sector
digital
switch coder shuffle
interface
Digital
Inner
HELICAL Record
Sync./
Data
Channel
re-
.41- .4---
TRACK driver ECC
ID generator
coder MUX
and head
coder
Control track
Control track
generator
External
- - Record
time code Time code
drivers
Time code
generator
-
- - and heads
(analog)
Recording
Cue/reference
amplifier
IEC 190193
Figure 1 - Record block diagram
1179 ©IEC:1993 - 13 -
AUDIO
Analog/ Outer Audio ■
Audio error
Analog
digital data
.4- ECC f
conceal
•
interface deshuffle
decoder
Digital
VIDEO
Outer
Analog/
Channel •
Intra-sector
Video error
Analog .III-. .4-
DEMUX f ECC
digital Buffer
conceal deshuffle
switch
interface decoder
Digital
Inner Data
HELICAL Playback
Channel
Sync
routing
TRACK -4. -►
head preamp t ECC
decoder detector
switch
and equalizer
decoder
Control track
Control track
playback
Time code - Heads and
Time code
playback
reader
Time code
_ interface
(analog)
Playback
Cue/reference
amplifier
1EC 191193
Figure 2 - Playback block diagram
1179 ©IEC:1993 - 15 -
HELICAL-SCAN DIGITAL COMPOSITE
VIDEO CASSETTE RECORDING SYSTEM USING
19 mm MAGNETIC TAPE, FORMAT D2
(NTSC, PAL, PAL-M)
SECTION 1: GENERAL
1.1 Scope
This International Standard specifies the content, format and recording method of the data
blocks forming the helical records on the tape containing video, audio and associated data
using the 19 mm type D-2 cassette. In addition, this standard specifies the content, format
and recording method of the longitudinal record containing tracking information for the
scanning head associated with the helical records.
1.2 Normative references
The following normative documents contain provisions which, through reference in this
text, constitute provisions of this International Standard. At the time of publication, the
editions indicated were valid. All normative documents are subject to revision and
parties to agreements based on this International Standard 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 461: 1986, Time and control code for videotape recorders
IEC 735: 1991, Measuring methods for videotape properties
IEC 958: 1989, Digital audio interface
CCIR Volume X1 - Part 1 - Section 11A - Rapport 624-3: 1986 - Characteristics of tele-
vision systems
Lining-up and
CCITT Blue book, Volume Ill - Fascicle 111.4 - Recommendation J.15: 1988,
monitoring an international sound-programme connection
CCITT Blue book, Volume III - Fascicle 111.6 - Recommendation J.17: 1988, Pre-emphasis
used on sound-programme circuits
IEEE Standard 1952: 1953, Volume measurements of electrical speech and program waves
ISO 2110: 1989, Information technology - Data communication - 25-pole DTE/DCE
interface connector and contact number assignments
1179 ©IEC:1993 - 17 -
1.3 Definitions, symbols and abbreviations
For the purposes of this International Standard, the following definitions apply.
1.3.1 AES: Audio engineering society.
1.3.2 ECL: Emitter coupled logic, family of digital logic integrated circuits. In this
standard, ECL refers to the 10 000 series of logic integrated circuits.
1.3.3 GF Galois field: Mathematical field containing a finite number of elements in which
algebraic operations may be performed. The number of field elements is generally written
as an argument in parentheses, e.g. GF(256).
1.3.4 LSB
1) Least significant bit of a word of data.
2) Least significant byte of a data item consisting of two or more bytes.
1.3.5 MSB
1)
Most significant bit of a word of data.
2) Most significant byte of a data item consisting of two or more bytes.
1.3.6 r.p.s.: Revolutions per second.
1.3.7 ScH: Colour subcarrier to horizontal sync timing relationship.
1.4 Environment and test conditions, reference tape and calibration tape
1.4.1
Environment and test conditions
Tests and measurements made on the system to check the requirements of this standard
shall be carried out under the following conditions:
- temperature: 20 °C ± 1 °C;
- relative humidity: 50 % ± 2 %;
- barometric pressure: 96 kPA ± 10 kPA;
- tape conditioning: not less than 24 h;
- tape tension: 0,7 N ± 0,05 N.
1179 ©IEC:1993 - 19 -
1.4.2
Reference tape
Blank tape to be used for calibration recordings may be purchased from the following
manufacturers:
Company Part Number
Ampex Corporation Series - 319*
Sony Corporation to be determined*
1.4.3 Calibration tape
Manufacturers of videotape recorders to this format specification will sell calibration tapes
meeting the following requirements.
1.4.3.1 Record locations and dimensions
Tolerances shown in tables 4 and 5, will be reduced by 50 %.
1.4.3.2 Calibration signals
Two classes of signals will be recorded on the calibration tapes.
a) A series of conventional test signals for level calibration, consisting of at least:
- video: colour bars;
audio: 1 kHz tone at -20 dB below full level;
-
cue: 1 kHz tone at operating level;
10 KHz tone at operating level.
These test signals are contained on the following tapes:
- Sony part number 8-960-071-52 (525/60)*;
-
Ampex part number 1525058 (525/60); 1525053 (625/50)*.
b) Signals recorded on only one of the four record heads for the purpose of mechanical
alignment.
These test signals are contained on the following tapes:
- Sony part
number 8-960-071-11*;
-
Ampex pa rt number 1525052-02*.
* This information is given for the convenience of users of this International Standard and does not constitute
an endorsement by the IEC of the product named. Equivalent products may be used if they can be shown
to lead to the same results.
1179 © I EC:1993 - 21 -
SECTION 2: VIDEOTAPE-CASSETTE
2.1 Mechanical parameters
2.1.1 Cassette dimensions
The dimensions of the three different cassettes used for recording shall be in accordance
with figures 3 to 17.
General tolerances for dimensions, except those for which tolerances are otherwise
specified, shall be as indicated in table 1.
Table 1 - Mechanical tolerances
Tolerances
From To
mm mm mm
±0,2
0 4
4 16 ±0,3
16 63 ±0,4
250 ±0,5
250 ±0,7
2.1.2 Identification of cassettes
The three sizes of cassettes shall be identified as:
- small: S;
- medium: M;
- large: L.
2.1.3 Tape lengths, thickness and play times
The tape length, thickness and play time for the three sizes of cassettes shall be as
indicated in table 2 for 525/60 and 625/50 systems.
Table 2 - Tape length and play time of S, M, L cassettes
Tape thickness 13 µm
Cassette
size
Tape length Play time
m min
s 253 31
M 744 93
1 647 207
L
2.1.4 Face of magnetic coating
The magnetic coating on the tape shall face out of the cassette as specified in figures 3
to 5.
1179 ©IEC:1993 - 23 -
2.1.5 Datum planes
2.1.5.1 Datum plane Z shall be determined by datum areas A, B and C as specified in
figures 6 to 8.
2.1.5.2 Datum C does not correspond to a fastener.
2.1.5.3 Datum plane X shall be orthogonal to datum plane Z and shall run through the
center of datum hole (a) and datum hole (b) as specified in figures 9 to 11.
2.1.5.4 Datum plane Y shall be orthogonal to both datum plane X and datum plane Z and
shall run through the centre of datum hole (a) as specified in figures 9 to 11.
138 *
Datum plane X
Reel lock
and release
/EC 192/93
Dimensions in millimetres
NOTES
Dimensions with an asterisk (') are nominal values specifying the tape path.
2 Area for the reel.
Figure 3 - Top view, inner structure and tape path of the S cassette
-
1179 ©IEC:1993 25 -
132 '2,5
Lid lock
Lid lock
and release
and release
Reel lock
and release
!EC 193/93
Dimensions in millimetres
NOTES
1 Dimensions with an asterisk (*) are nominal values specifying the tape path.
2 Area for the reel.
Figure 4 - Top view, inner structure and tape path of the M cassette
1179 ©IEC:1993 - 27 -
IEC 794193
Dimensions in millimetres
NOTES
1 Dimensions with an asterisk (*) are nominal values specifying the tape path.
2 Area for the reel.
Figure 5 - Top view, inner structure and tape path of the L cassette
1179 © IEC:1993 — 29 —
140,5
1 0
Datum plane X
^
r;
1 145
Maximum holding area ^•^•^yy^^^^^•^•^Od•^^ • ^ ^^•O^O^ ^^^^^•^^^^^•^•^•^^^^^•
^
_•.•.•.•.•.aaaaa•!aCa•!•^ ^^.•!.Qaaa•s.•.•_^.•.aa•. ;:
^•
^
^•^
.^
Support area
.^
.y
.^
^•i
Datum area
•:^`
0 10
Datum plane X ZEC 195193
Dimensions in millimetres
NOTES
1 The cassette shall be secured by the recorder and/or player unit on the crosshatched area.
2 The periphery within 1,0 mm from the edge of guiding groove B and from the edge of the casse tte shall
be removed from the support area. The cassette shall be supported by the recorder and/or player unit on
the hatched area.
3 Datum plane Z shall be determined by datum areas A, B, and C.
Figure 6 — Datum area, support area and holding area of the S cassette
1179 © IEC:1993 -31 -
Datum plane Y-NN,1/4
140,5
130,5 ± 0,3
10 20
Datum plane X
q^^ i^^^:^I
q
^^^.^^ ^:c.^
^
CO
^
5 139
45 179
Datum plane Z
Guiding groove B
i:!:!:!::
Maximum holding area
® Support area
N
Datum area
0 10
Datum plane X
IEC 196193
Dimensions in millimetres
NOTES
The cassette shall be secured by the recorder and/or player unit on the crosshatched area.
tte shall
2 The periphery within 1,0 mm from the edge of guiding groove B and from the edge of the casse
be removed from the support area. The cassette shall be supported by the recorder and/or player unit on
the hatched area.
3 Datum plan Z shall be determined by datum areas A, B, and C.
rt area and holding area of M cassette
Figure 7 - Datum area, suppo
1179 © IEC:1993 - 33 -
Datum plane X
Maximum holding area
® Support area
Datum area
fr
0 10
Datum plane X
/EC 197/93
Dimensions in millimetres
NOTES
The cassette shall be secured by the recorder and/or player unit on the crosshatched area.
2 The periphery within 1,0 mm from the edge of guiding groove B and from the edge of the casse tte shall
be removed from the support area. The cassette shall be supported by the recorder and/or player unit on
the hatched area.
3 Datum plane Z shall be determined by datum areas A, B, and C.
Figure 8 - Datum area, support area and holding area of L cassette
1179 ©IEC:1993 - 35 -
0.1
0 5 +
Datum plane Y
Datum hole (a)
User hole 146,5 ± 0,3
(see figure 15)
130,5 ± 0,3
Datum plane X Min. 5
Lid lock
N
and release
o
(see figure 23)
Coding hole ^
+i 30° (2x)
User hole
^
ô Lr)
CO (see figure 15)
+1
ô
N
5+0.1 (6
o x)
+1
Datum hole (b)
o
User hole
(see figure 15)
Guiding groove B.
Depth: 2 0
- 0,5
r''
-,Guiding groove A
x
Depth: 3 ± 0,1
•o
o
+
0,1
fd5
^
± 0.2
o Reel lock
^
^a+
../
\--and release
User hole
(see figure 20)
(see figure 15) 67 ±
±
0,2'
19+0,7.
153 + (3,7
- 0,3
- 0,3
(172)
Max. R 0,5'
Max. R 0,5
Section AA. Section BB
rEC !98/93
Dimensions in millimetres
Figure 9 - Bottom view of S cassette
1179 ©IEC:1993 — 37 —
Datum plane Y
05+0,1
37,5 ± 0,3 171,5 ± 0,3
Datum hole (a)
User hole
Min. 5
146.5 + 0,3
\
(see figure 16)
130,5 ± 0,3
Min. 5
Lid lock 124
Min. 5
and release
(see figure 23)
Datum plane X
Lid lock
and release
N
(see figure 23)
+1
^
+ 0,1 (6 x)
9 ' 0
Q
Datum hole (b)
leD User hole
(see figure 16)
+ Guiding groove B
.^^ Depth: 2 -
0,5 .1
q \
to- C °
II
,.„,mwsz.m.g.
25 ± 0,2
67 ± 0,2^
±
0,2
129,5 ± 0,2
0 ,7
60+
- 0,3 0,7
194 +
0,3
-
(254)
Max. R 0,5
Max. R 0,5 Max. R 0,5
Section BB Section CC.
IEC 199193
Dimensions in millimetres
Figure 10 — Bottom view of M cassette
1179 © IEC:1993 - 39 -
Datum plane Y
63,5 ± 0,3 197,5 ± 0,3
F37,5 ± 0,3 171,5 ± 0,3
Min.5 ' r ±
146,5 4.4_1■Ain. 5
0,3
L
± Min.
Min. 5 5
130,5 0,3 I
di-k.
124 Min. 5
Lid lock
Lid lock
and release
7 iii--- and release
(see figure 23)
(see figure 23)
°° (2x)
CodiCoding hole U)
User hole I
(see figure 17)
9 (6 x)
Q 5+ 0,1 n' ^ 5 + fi t
o
^
Datum hole (a) ço
N y
Datum hole (b)
\
O User hole
■L^ User hole
+1
(see figure 17)
(see figure 17)
c., tr)
CT
+ ,
cô
0 ^ os^2+1.
B
N
1.— —
ibx o
-s
Guiding groove A
Depth: 3 ± 0,1
C
± 0,2 5 +
.25 0.1
° \Guidingroove B groov
, 2 „r, _User hole
67 ± 0
j (see figure 17) Depth: 2 °
+ 02_ - 0,5
I 23,5 ± 0,2 1
s.+ 157,5±02
116 + 0,7 _ l _
250 + 0.7
r - 0,3
- 0,3
(366)
Max. R 0,5
Max. R 0,5
Section AA
Section BB Section CC
IEC
Dimensions in millimetres
Figure 11 - Bottom view of L cassette
2.1.6 Window and labels
2.1.6.1 Window and label areas shall be as specified in figures 12 to 14.
2.1.6.2 Labels attached to the cassette shall not extend beyond the external dimensions
as shown in figures 12 to 14.
2.1.6.3 Labels shall not interfere with the identification holes of the users or the
manufacturers.
1179 © IEC:1993 -41 -
2.1.6.4 Labels shall not interfere with the hub drive and support mechanism.
N O
+
CV
N
Note 1
Window area/ label area
Datum plane Z 6 139
—\■ 90
I.
Q.
!IMMENSE MIN
W^^^ ^,^
^ ^^^ ^^
CD -^^ ^^4^a.^A^R^.^^^^i^1^^^^^^•^^^_
^^^^^^^^^/►^^^^^^^^^^^ -^
^• u
^ ^ ^ ^^ ^ y ^ ^ ^^^ ^^ , ^
Xpt, K^^//1
^-
, '• • • • • ♦ / • ^ `^ ♦ ♦•• ♦J , ^
Note 2
Depth: 0,2 to 0,3
__ 3 + 1,5
2 e figure 19)
3+ 1.5
22 +
L67 ± 0,2
33 ± 0 3
Picker notch
Min. 140
Note 5 Picker notch
Max. 138
Depth: 0,2 to 0,3
Max. 4
142 8 "
+ 0.3 ■
+ 0,3
Note 2
o
Depth: 0,2 to 0,3
Detent and
misinsertion notch
o
Configuration-optional
user plug (2)
Details of A
1EC 201193
Dimensions in millimetres
NOTES
1 The crosshatched area is available for the window/labels.
2 The side label may be attached to this recessed area.
3 The rear label may be attached to this recessed area.
4 The lid label may be attached to this recessed area.
5 The top label may be attached to this recessed area.
Figure 12 - Top and side view of S cassette
1179 ©IEC:1993 -43-
Datum plane Y
co
^ ^
C+i
Co Co ^
o
Note 4
c
4±1
+1
Depth: 0,2 to 0,3
Co
Datum plane Z
N p
4 user plugs
(see figure 16)
Note 1
cNU
N
Window area/ label area
46 6 6
Datum plane X 180
6 ,
—co
c6 '9 (2k)
+1
N
O
+1
b
O ^
O
N `^
O
3+ 1,5
22 3 + 1 , 5
22+^
o
/^ 0
^\
-33 ± 0,3
Note 2
Min. 200
'(see figure 19) \
Depth: 0,2 to 0,3
Max. 179
Max. 45 + 0 .7
- 0,3 Note 2
(254)
Depth: 0,2 to 0,3
Note 3
90°
Depth: 0,2 to 0,3
° 1,5
`+ 8+0.4
Q-/'
N 0
N
38±3 co
^ N
15, Section BB
C^
200 +
Detent and
misinsertion notch
^-"\ Configuration-optional
, user plug (2)
Details of A
IEC 202193
Dimensions in millimetres
NOTES
1 The crosshatched area is available for the window/labels.
2 The side label may be attached to this recessed area.
3 The rear label may be attached to this recessed area.
4 The lid label may be attached to this recessed area.
5 The top label may be attached to this recessed area.
Figure 13 - Top and side view of M cassette
1179 © IEC:1993 - 45 -
Datum plane Z
Datum plane Y
i
OD (V p
i° ,n Note 4 +
cri
Depth: 0,2 to 0,3 C° 0, +1 :.c^
I N ,
^ i^ ^
I
Datum plane X
Datum plane Z
Details of C
22 +
0 0
Note 5
33 ± 0,3
Depth: 0,2 to 0,3
Min. 300
Note 2
Max. 235 Depth: 0,2 to 0,3
1,5
Note 3
Depth: 0,2 to 0,3 90°
+
8 0,4
80 ± 7
/—
280+
Detent aand 0
misinsertion notch
Configuration-optional
_user plug (2)
Details of A
203/93
IEC
Dimensions in millimetres
NOTES
1 The crosshatched area is available for windows/labels.
2 The side label may be attached to this recessed area.
3 The rear label may be attached to this recessed area.
4 The lid label may be attached to this recessed area.
5 The top label may be attached to this recessed area.
Figure 14 - Top and side view of L cassette
1179 ©IEC:1993 - 47 -
2.1.7 Identification holes
2.1.7.1 There shall be two sets of identification holes; one for use by the manufacturer
and the other for the user.
2.1.7.2 The dimension and location of manufacturers' coding holes, specified in
figures 15 to 17 shall be defined as follows:
2 shall be used in combination to indicate tape thickness according to the
Holes 1 and
following logic table:
Hole numbers: 1 2
00= 16 pm tape
0 1 = 13 pm tape
1 0 = undefined/reserved
1 1 = undefined/reserved
NOTE - Only 13 µm tape is recognized for the purposes of interchangeability.
Holes 3 and 4 shall be used to indicate the coercivity of the magnetic recording tape
according to the following logic table.
Hole numbers: 3 4
0 0 = class 850
0 1 = class 1 500 (metal particle)
1 0 = undefined/.reserved
1 1 = undefined/reserved
NOTES
1 Only class 1 500 is used for the purposes of interchangeability.
A "0" in tables for holes 1 through 4 indicates that the indicator tab is removed or open, which results
in an undetected state by the recorder/player sensor mechanism.
17 are
The dimension and location of the users' coding holes specified in figures 15 to
defined as follows.
When a "0" state exists, the user holes shall identify the following conditions:
a) total record lockout (audio/video/cue/time code/control track);
b) reserved and undefined;
video and control track record lockout;
c)
d) reserved and undefined.
The user plug mechanism shall withstand an axial force of 0,5 N.
2.1.7.3
1179 ©IEC:1993 — 49 —
Datum plane Z
Datum plane X
/ Datum plane Y
User plug (4)
130,5
User plug (3)
I
+i
N
Detection level (1)
n
Detection level (0)
User plug (1)
User plug (2)
Section CC
User hole (1)
Coding hole (3)
C•--67 ± 0,2--- Coding hole (2)`
User hole (2) I Coding hole (4)
Coding hole (1) \
•
Max. R 0,7 (4x)
_ ,I Zink
In
C
O O
I'
A 4 +0,1
u -H +i
0 "1"-
c7 Ln
N N
l
I,
Min. 1,8 (plug)
/I►
\1^Zill II I I I I I
Min. 3 (hole)
DJB^^'
.^ ^
Retails of A
D ^A
Datum plane X •
130,5 ± 0,3
User hole (3)
User hole (4).
Datum plane Z
Detection level (1)
(datum hole) •
(datum hole)
Detection level (0)
!EC 204193
Dimensions in millimetres
NOTES
1 The cassette shall be provided with four coding holes (1) to (4) and four user holes (1) to (4). When
any plug is removed, the opening shall be as shown in detail A.
User holes (3) and (4) on the upper shell shall be opened when user plugs are removed.
3 All cassettes shall be provided with holes as defined by sections DD and CC.
Figure 15 — S cassette coding holes and user holes
1179 ©IEC:1993 — 51 —
Datum plane Z
Note 3
Min. 18 Detection level (1)
Datum plane X
Datum plane Y
/
User plug (4)
f
130,5
User plug (3)
Cr)
O
ia
Detection level (1)
^
^
N
Detection level (0)
O
User plug (1)
Section CC
User plug (2)
User hole (1)
Coding hole (3)
Coding hole (4)
Max. R 0,7 (4x)
Min. 1,8 (plug)
Min. 3 (hole)
Details of A
Datum plane X
User hole (3)
(datum hole)
Datum plane Z
level (1)
' Detection
User hole (4)
Detection level (0)
(datum hole)
IEC 205193
Dimensions in millimetres
NOTES
1 The cassette shall be provided with four coding holes (1) to (4) and four user holes (1) to (4). When
any plug is removed, the opening shall be as shown in detail A.
2 User holes (3) and (4) on the upper shell shall be opened when user plugs are removed.
3 All cassettes shall be provided with holes as defined by sections DD and CC.
Figure 16 — M cassette coding holes and user holes
1179 ©IEC:1993
— 53 —
Datum plane Z
Datum plane X
Note 3
Datum plane Y
User plug (4)
Min. 18 ,Detection level (1)
,i
130,5
User plug (3)
•
Detection level (1)
Detection level (0)
User plug (1)
User plug (2)
Section CC
User hole (1)
67 ± 0,2
Coding hole (3)
Coding hole (4)
Max. R 0,7 (4x)
Details of A
Datum plane X
Detection level (1)
Detection level (0)'
'°
..."!F^Tl^^
• a^^
IEC 206/93
Dimensions in millimetres
NOTES
1 The cassette shall be provided with four coding holes (1) to (4) and four user holes (1) to (4). When
any plug is removed, the opening shall be as shown in detail A.
2 User holes (3) and (4) on the upper shell shall be opened when user plugs are removed.
3 All cassettes shall be provided with holes as defined by sections DD and CC.
Figure 17 — L cassette coding holes and user holes
1179 ©IEC:1993 - 55 -
2.1.8 Leader/Trailer tape
2.1.8.1 The cassette shall include leader and trailer tape. When attached to the hub,
there shall be a length of 300 mm ± 30 mm between the splice point and the outside of the
cassette shell.
2.1.8.2 The leader/trailer tape material shall be polyester or equivalent having a trans-
missivity of at least 60 % when measured with a 700 nm to 900 nm light source.
2.1.8.3 When attached to the hub, the leader/trailer tape shall not separate when
subjected to a force of 22 N or less.
2.1.8.4 The width of the leader/trailer tape shall be 19 nm ± 0,025 nm.
2.1.8.5 The thickness of the leader/trailer tape shall be 20 pm ± 10 pm.
2.1.8.6 The splicing tape used to attach the leader tape shall be applied to the non-
magnetic coated side.
2.1.9
Reels
2.1.9.1 The dimensions of the reels and the relationship between the reels and reel
tables are specified in figures 18 and 19.
2.1.9.2 The reels shall be locked automatically when the cassette is removed from the
recorder/player.
2.1.9.3 When a S cassette is inserted into a recorder/player, the reels shall be unlocked
automatically as specified in figure 20.
The force needed to release the reel lock of the S cassette shall be 0,5 N ± 0,1 N.
2.1.9.4 When an M or L cassette is inserted into a recorder/player, the reels shall be
unlocked automatically by opening the lid as specified in figures 21 and 22.
2.1.9.5 The reels shall be held in position by a reel spring with a force as shown in table
3, when the height of the reel table support is 2,0 mm ± 0,2 mm from datum plane Z.
2.1.9.6 The reel spring force shall be as indicated in table 3.
Table 3 - Reel spring force
Force
Cassette size
N
s 3-4
M 3-11
L 8-11
1179 © IEC:1993
—57 -
Cassette S
0 81,5 ref.
Note 0 36
Support plane
-49°0',11
N ote 045+00,1
Reel guard
k Section AA
- 049 Internal radii max. R 0,3
0 58
0 62
1---0 66,4 ± 0,2
Cassette M
0 122,5 ref.
0 0
Suppo rt plane
Note 0 36
- 0,1
o
1 II I-
0,1
Note 0
45 +
Reel guard
Internal radii max. R 0,3
^ 0 49
0 58
0 62
^-0 66,4 ± 0,2 —^
L
Casssette
m
^
Note 0 36 _
0'1
N II
t 0 45 +'l
Suppo rt plane
^ o
Reel guard
^I--- 0 49
0 58 Internal radii max. R 0,3
0 62—
^-0 66,4 t 0,2 —^-
IEC 207/93
Dimensions in millimetres
NOTE - The centre of the reel and the reel table shall be positioned on either the centre of the area
00'o
36,0 mm in diameter or the centre of the area 45,0 + 0 ,0 mm in diameter.
Figure 18 — Video cassette reel
1179 ©IEC:1993 - 59 -
Min. 0 10
See figures 12 to 14
^
Off the
machine
Note 3
Reel table
\
Note 4
IEC 208/93
Cassette S, M Cassette L
Details of A
Dimensions in millimetres
NOTES
1 Distance between the support area of the reel table and datum plane Z.
2 Distance between the support area of the reel table and tape centre.
3 Support area of the reel table.
4 Hatched area shows the maximum reel table area.
5 Reel spring pressure shall meet the specifications shown in 2.1.9.5.
6 If necessary, more reel spring pressure shall be applied to this portion from the outside.
7 The reel spring structure is at manufacturer's option.
Figure 19 - Relationship between reel and reel table
1179 ©IEC:1993 —61 —
Release pin
Guiding groove A
Reel lock and release
Datum plane X.,
Release pin
Note 1
B
First engaged position
70,5 ± 2,5
Released position
74,5 ± 0,5
Section AA
IEC 209/93
Dimensions in millimetres
NOTES
1 Clearance B shall be 0,5 mm at a minimum when the release pin is located 75 mm away from datum
plane X.
2 The end of the reel lock shall be outside the reel area 84 mm minimum in diameter when the release
pin is located 74 mm away from datum plane X.
Figure 20 — S cassette reel lock and release
1179 © IEC:1993
- 63 -
Reel lock and release
Reel lock and release
See note 1
Released position
Datum plane Z
IEC 210/93
Dimensions in millimetres
NOTE - The end of the reel lock shall be outside the reel area 125 mm minimum in diameter, when the lid
is opened 20 mm or more above datum plane Z. It shall be engaged when the lid is opened 10 mm or less
above the datum plane Z.
Figure 21 - M cassette reel lock and release
1179 © IEC:1993
— 65 —
Reel lock and release
Reel.fock and release.
See note 1
Released position
Datum plane Z
tEC 211193
Dimensions in millimetres
NOTE - The end of the reel lock shall be outside the reel area 181 mm minimum in diameter when the lid
is opened 20 mm or more above datum plane Z. It shall be engaged when the lid is opened 10 mm or less
above the datum plane Z.
Figure 22 — L cassette reel lock and release
1179 ©IEC:1993 – 67 –
2.1.10 Lid
2.1.10.1 The lid shall be unlocked and opened by the recorder/player when the cassette
is inserted.
2.1.10.1.1 The lid shall be unlocked by a force of 0,5 N ± 0,1 N exerted upon the release
pin, as specified in figures 23 and 24.
2.1.10.1.2 The inner door shall be lifted by the recorder/player to the position shown in
figure 25.
2.1.10.2 The outer door when open shall not exceed 51 mm with respect to datum plane
Z, as specified in figure 25.
2.1.10.3 When the cassette is removed from the recorder/player, the lid shall lock auto-
matically.
2.1.10.4 The maximum force to open the lid shall be 1,5 N up to the 32 mm minimum
height as defined in figure 25.
2.1.10.5 The force required to open the lid shall be applied 90° ± 5° to the datum plane Z
at the lower edge of the inner door (see 2.1.10.1.2 and figure 25).
- 69 -
1179 © IEC:1993
Cassettes M, L
M
Cassette S
%!/^*\\\\\\;\\\\\\^\\\\
►^^+
^`
.^q
ion.
1.
^. ` `
Release pin
Release position,
3,5 ± 0,5
11 ± 1 First engaged position
Datum plane X
IEC 212/93
Dimensions in millimetres
NOTES
1 Clearance B shall be 0,5 mm at a minimum when the release pin is located 3 mm from datum plane X.
2 The lid lock shall be released when the release pin is located 4 mm from datum plane X.
Figure 23 - Lid lock and release
1179 © IEC:1993
- 71 -
Datum plane X
Datum plane Y
Dimensions in millimetres
Figure 24 - Minimum space for VTR loading mechanism
1179 ©IEC:1993 — 73 —
Datum plane X
/
y
^
N
Datum plane Z
7,5
Max. R 29
Z
Datum plane
/EC 214/93
Dimensions in millimetres
NOTE - Lid shall open to a height of at least 32 mm.
Figure 25 — Lid structure
1179 ©IEC:1993 -75 -
2.2 Videotape specification
2.2.1 Base
The base material shall be polyester or equivalent.
2.2.2 Width
The tape width shall be 19,010 mm ± 0,015 mm.
For measurements IEC 735 shall apply.
2.2.3 Width fluctuation
Width fluctuation shall not exceed 6 pm peak-to-peak. Measurement of width fluctuation
shall be over a tape length of 230 mm with a tension of 0,7 N ± 0,05 N.
2.2.4
Reference edge straightness
The reference edge straightness maximum deviation is 6 pm peak-to-peak. Edge straight-
ness fluctuation is measured at the edge of a moving tape guided by three guides having
contact to the same edge and having a distance of 115 mm from the first to second guide
and 115 mm from the second to third guide. Edge measurements are averaged over
10 mm lengths and are made 5 mm from the midpoint between the first and second guide,
towards the first guide.
2.2.5 Tape thickness
The tape shall have a thickness between 11 pm and 13 pm (13 pm nominal).
2.2.6 Transmissivity
Transmissivity shall be less than 5 %, measured over the range of wavelengths of 700 nm
to 900 nm.
2.2.7 Offset yield strength
The offset yield strength shall be greater than 15 N. The force to produce 1 % tangential
elongation of a 200 mm test sample with a pull rate of 100 mm per minute shall be used to
confirm the offset yield strength. The initial tangential slope is extended and read at 1 %
elongation.
2.2.8 Magnetic coating
The magnetic tape used shall have a coating of metal particles or equivalent.
Coating coercivity
2.2.9
The coating coercivity shall be a class 1 500 (120 000 A/m), with an applied field of
5 000 A/m as measured by a 50 Hz or 60 Hz BH meter or vibrating sample magneto-
meter (VSM).
2.2.10 Particle orientation
The metal particles shall be longitudinally oriented.
1179©IEC:1993 - 77 -
SECTION 3: HELICAL RECORDINGS
3.1 Tape speed
The basic value for tape speed is 131,700 mm/s for 525/60 and 625/50 systems. The tape
speed tolerance is ±0,2 %.
3.2 Record location and dimensions
3.2.1 Record location and dimensions for continuous recording shall be as specified in
figures 26 and 27 and table 4 (525/60 systems) or table 5 (625/50 systems). In recording,
including editing, sector locations on each helical track shall be contained within the
tolerances specified in table 4 or 5 and figure 26.
3.2.2 The reference edge of the tape for dimensions specified in this standard shall be
the lower edge as shown in figure 26. The magnetic coating, with the direction of tape
travel as shown in figure 26, is on the side facing the observer.
All dimensions in the tables and figures are to be measured from an equivalent reference
edge. The tape reference edge is a line through three points on the edge of the tape and
constrained to lie in one straight line. This constraint may be a physical deformation or an
equivalent mathematical transformation. The first and third points shall be separated by a
distance MD of 210 mm. The second point shall be located at a distance of 0,2 MD from
the first point and 0,8 MD from the third point, as shown in figure 28. The program area
reference point lies on a line perpendicular to the reference edge as shown in figure 28.
Measuring techniques are shown in annexes B and C.
3.2.3 This standard permits the use of either overwrite recording or erase heads for the
helical tracks. Figure 26 defines dimensions of the helical track. The track pitch is 39 pm
for 525-line systems and 35 pm for 625-line systems. The record head width and height
tolerances shall be chosen so as to ensure zero guard band between recorded tracks or, if
a small guard band is present, it shall not contain any previously recorded information.
The minimum track width after overlap recording is 35 pm for 525-line systems and 31 pm
for 625-line systems measured across the track in a line perpendicular to the centreline of
the tracks.
1179 ©IEC:1993 — 79 —
Direction of tape panel
F
H W
G
a
^ ^ ^ ^
Reference edge A B C D E
f
IEC
215/93
NOTES
1 A1, A2, A3 and A4
are audio sectors.
2 To
, T. are track numbers, S
o is segment number (typical).
3 Tape viewed from magnetic coating side.
4 Dimensions X 1 - X5
are determined by the program area reference point as defined in figure 27,
in 3.4.3 and at the end of the preambles of the corresponding video and audio sectors specified in section 4.
Figure 26 — Location and dimensions of recorded tracks
-81 -
1179 ©IEC:1993
1 Control track record
Tape
motion
\
A
Servo reference
pulse
^
Reference edge
Detail B
Detail A
2 Cue time code record
Tape
motion
IEC 216193
Figure 27 - Location of cue, time code and control track record
1179 © I EC:1993 - 83 -
Table 4 - Record location and dimensions for 525/60 systems
Nominal Tolerance
Dimensions
Millimetres
± 0,1
0,2
A Time code track lower edge
± 0,1
Time code track upper edge 0,7
B
1,0 ± 0,1
C Control track upper edge
± 0,05
1,5
D Control track upper edge
1,807 derived
Program area lower edge
E
derived
16,1
F Program area width
18,2 ± 0,1
G Cue track lower edge
± 0,1
18,9
H Cue track upper edge
0,0391 reference
Helical track pitch
I
derived
132,49
K Video sector length
derived
150,78
L Helical track total length
4,13 derived
M1 Audio sector length*
derived
4,01
M Audio sector length**
107,66 ± 0,3
Control track
P 1
± 0,3
108,41
P2 Cue/time code track
± 0,015
19,01
W Tape width
± 0,1
X1 Location of start of video sector
± 0,1
4 137,57
X2 Location of start of audio sector A
± 0,1
Location of start of audio sector A 3 133,03
X3
± 0,1
2 4,54
X4 Location of start of audio sector A
± 0,1
9,08
X5 Location of start of audio sector A 1
basic
2,80
Y Program area reference
Nominal Tolerance
Dimensions
Degrees
6,1296 basic
8 Track angle
± 0,17
+14,97
ao Azimuth angle (track 0)
-15,03 ± 0,17
Azimuth angle (track 1)
a.,
Audio sector A, on track 0, sector A3 on track 1.
*
** All other audio sectors.
The above dimensions shall apply under the conditions specified in clause 1.4.
1179 © IEC:1993
- 85 -
Table 5 - Record location and dimensions for 625/50 systems
Dimensions Nominal Tolerance
Millimetres
A Time code track lower edge 0,2 ± 0,1
B Time code track upper edge 0,7 ± 0,1
C Control track upper edge 1,0 ± 0,1
D Control track upper edge 1,5 ± 0,05
E Program area lower edge 1,797 derived
F Program area width 16,1 derived
G Cue track lower edge 18,2 ± 0,1
18,9 ± 0,1
H Cue track upper edge
I Helical track pitch 0,0352 reference
derived
K Video sector length 135,39
derived
L Helical track total length 150,71
M., Audio sector length' 3,47 derived
derived
M Audio sector length" 3,37
P 1 Control track 106,02 ± 0,3
P2 Cue/time code track 106,70 ± 0,3
W Tape width 19,01 ± 0,015
0,1
X1 Location of start of video sector 0 ±
X2 Location of start of audio sector A 4 139,63 ± 0,1
± 0,1
X3 Location of start of audio sector A3 135,82
X4 Location of start of audio sector A2 3,80 ± 0,1
7,61 ± 0,1
X5 Location of start of audio sector A i
Y 2,63 basic
Program area reference
Dimensions Nominal Tolerance
Degrees
6 Track angle 6,1396 basic
+14,97 ± 0,17
ao Azimuth angle (track 0)
± 0,17
ai Azimuth angle (track 1) -15,03
* Audio sector A 1 on track 0, sector A3 on track 1.
** All other audio sectors.
NOTE - The above dimensions shall apply under the conditions specified in clause 1.4.
-
1179 ©IEC:1993 - 87
3.3 Helical track record curvature, tolerance zones, centre lines
The centre lines of any four consecutive tracks shall be contained within the pattern of the
four tolerance zones established in figure 28.
Each zone is defined by two parallel lines which are inclined at an angle of 6,1296° basic
for 525/60, and 6,1326° basic for 625/50, with respect to the tape reference edge.
The centre lines of all zones shall be spaced apart, 0,0391 mm for 525/60 and 0,0352 mm
for 625/50 basic. The width of the first zone shall be 0,008 mm basic. The width of zones 2
through 4 shall be 0,012 mm basic
...
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