SIST EN 61119-1:1999

Digital audio tape cassette system (DAT) -- Part 1: Dimensions and characteristics

Applies to the digital audio tape (DAT) cassette system that records and/or plays back digital information such as PCM encoded audio and/or other data. Defines the parameters that affect the compatibility between cassettes and the associated tape recorders. It is also intended as a reference for manufacturers producing cassettes and/or tape recorders which are to conform with the system described in this part.

Digitales Tonband-Kassetten-System -- Teil 1: Maße und Kennwerte

Système audionumérique à cassette (DAT) -- Partie 1: Dimensions et caractéristiques

S'applique à un système audionumérique à bande magnétique (DAT) en cassette destiné à l'enregistrement et à la reproduction d'informations numériques telles que des signaux codés MIC et/ou d'autres données. Définit les paramètres qui assurent la compatibilité des cassettes avec les machines à bande associées. Est également destinée à servir de référence pour les fabricants de cassettes et les constructeurs de machines prévues pour être utilisées avec le système qui fait l'objet de la présente partie.

Digital audio tape cassette system (DAT) -- Part 1: Dimensions and characteristics (IEC 61119-1:1992)

General Information

• Status: Published
• Publication Date: 31-Mar-1999
• ICS: 33.160.30 - Audio systems
• Technical Committee: AVM - Audio, video and multimedia systems and equipment
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-1999
• Due Date: 01-Apr-1999
• Completion Date: 01-Apr-1999
• Ref Project: EN 61119-1:1994 - Digital audio tape cassette system (DAT) - Part 1: Dimensions and characteristics

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61119-1:1999
01-april-1999
Digital audio tape cassette system (DAT) -- Part 1: Dimensions and characteristics
(IEC 61119-1:1992)
Digital audio tape cassette system (DAT) -- Part 1: Dimensions and characteristics
Digitales Tonband-Kassetten-System -- Teil 1: Maße und Kennwerte
Système audionumérique à cassette (DAT) -- Partie 1: Dimensions et caractéristiques
Ta slovenski standard je istoveten z: EN 61119-1:1994
ICS:
33.160.30 Avdio sistemi Audio systems
SIST EN 61119-1:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61119-1:1999

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SIST EN 61119-1:1999

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SIST EN 61119-1:1999

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SIST EN 61119-1:1999

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SIST EN 61119-1:1999

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SIST EN 61119-1:1999
CEI
NORME
INTERNATIONALE IEC
1119-1
INTERNATIONAL
Première édition
STANDARD First edition
1992-11
à cassette (DAT)
Système audionumérique
Partie 7 :
Dimensions et caractéristiques
Digital audio tape cassette system (DAT)
Part 1:
Dimensions and characteristics
réservés — Copyright — all rights reserved
CEI 1992 Droits de reproduction
©
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized
utilisée sous quelque forme que ce soit et par aucun procédé, in any form or by any means, electronic or mechanical,
électronique ou mécanique, y compris la photocopie et les including photocopying and microfilm, without permission
microfilms, sans l'accord écrit de l'éditeur. in writing from the publisher
Bureau central de la Commission Electrotechnique Internationale 3, rue de Varembé Genève Suisse
CODE PRIX
Commission Electrotechnique Internationale
XE
PRICE CODE
International Electrotechnical Commission
IEC
MemtgyHapo4Haa 3rreltTpoTexHH4ecnaf HOMHCCHA
• • Pour prix, voir catalogue en vigueur
For price, see current catalogue

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SIST EN 61119-1:1999
- 3 --
1119-1©IEC
CONTENTS
Page
11
FOREWORD
13
INTRODUCTION
Clause
15 1 Scope and object
15
2 Normative references
17
3 Description of the system
17
4 Test conditions
17 5 Mechanical parameters
17 5.1 Cassette
17
Dimensions and tolerances 5.1.1
19
5.1.2 Outside view
5.1.3 Label area 19
5.1.4 Window 19
19 5.1.5 Accidental erasure prevention (AEP)
21
5.1.6 Recognition holes
21
5.1.7 Cassette holding area
21
5.1.8 Groove for loading grip
21
5.1.9 Tape begin/end detection
23
5.1.10 Lid
23
5.1.11 Slider locks
25
5.1.12 Hub
25 5.2 Tape
25
5.2.1 Magnetic tape
25
5.2.2 Leader and trailer tapes
25
5.2.3 Tape winding
25
5.2.4 Single hub friction torque
47 6 Track configuration and patterns
47 6.1 Track configuration
47
6.1.1 Tape speed and number of tracks per second
47
6.1.2 Track angle
47
6.1.3 Track pitch
47
6.1.4 Track length
47 6.1.5 Track centre
47 6.1.6 Head azimuth
6.1.7 Effective recording width 47
6.1.8 Definition of frame 47
49 6.1.9 Optional tracks

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SIST EN 61119-1:1999
1119-1 ©I EC - 5 -
Page
Clause
51
Signal allocation 6.2
51
6.2.1 Recording format of track
51
6.2.2 Positioning accuracy
51
Recording signals 6.3
53 Inter-block gap (IBG) 6.3.1
53 Preamble, postamble and margin
6.3.2
53
Automatic track finding (ATF), main data area and sub data area 6.3.3
53 7 Recording parameters
53
Recording level 7.1
53 Specification 7.1.1
53 Measurement method 7.1.2
55 7.2 Erasing method
55
Tracking scheme 8
55
Automatic track finding (ATF) 8.1
55
8.1.1 Definition
57 8.1.2 ATF signal allocation
57
8.1.3 Recording signal
65
Main data area format 9
65
Main data block format 9.1
65
9.1.1 Synchronization pattern
67 9.1.2 Main ID (W1, W2)
9.1.3 Main ID parity 69
69
9.1.4 Main data
69
9.2 Main data configuration
71 9.2.1 Main data allocation
73
Recording direction 9.2.2
73
9.3 Error correction and detection code (C1, C2)
9.3.1 Definition 73
75 Error correction code interleaving format
9.3.2
Parity symbol 77
9.3.3
9.4 Modulatin 79
Parameters 79
9.4.1
Modulation method 79
9.4.2
93
10 Sub data area format
Sub data block format 93
10.1
10.1.1 Synchronization pattern 93
10.1.2 Sub ID (SW1, SW2) 93
Sub ID parity 95
10.1.3
Sub data 95
10.1.4

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SIST EN 61119-1:1999
1119-1 0 1E - 7 -
Page
Clause
95
10.2 Sub data configuration
97 10.2.1 Sub data allocation
99 10.2.2 Recording direction
99 10.3 Error correction and detection code (SP)
10.3.1 Definition 99
101
10.3.2 Error correction code interleaving format
103
10.3.3 Parity symbol
103
10.4 Modulation
103
11 Audio encoding
103
11.1 Mode application
105
11.1.1 Audio encoding mode
105 11.1.2 System application
105
11.2 Source encoding
105
11.2.1 Emphasis
105
11.2.2 Number of audio channels
107
11.2.3 Sampling frequency
107
11.2.4 Sampling timing
109 11.2.5 Quantization
111 11.3 Word to symbol conversion
111
11.3.1 Audio data word
111
11.3.2 48k mode, 44k mode, 44k-WT mode and 32k mode
111
11.3.3 32k-LP mode
113
11.3.4 32k-4CH mode
113
11.4 Interleave format
115
11.4.1 48k mode, 44k mode, 44k-WT mode and 32k mode
115
11.4.2 32k-LP mode
117
11.4.3 32k-4CH mode
131
12 Sub code encoding for audio use
131
12.1 Sub code in main ID
131
12.1.1 101 to 107
137
12.2 Sub code in sub ID
137 12.2.1 Configuration of sub ID
139
12.3 Sub code in sub data
139 12.3.1 Pack ID and pack location
143
12.3.2 Configuration of pack
145
12.3.3 Assignment of pack item
159
12.4 Sub code in main data
159
12.4.1 Recognition word for compact disk (CD) sub code
159
12.4.2 Sub code for CD format

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SIST EN 61119-1:1999
1119-1 ©I EC – 9 –

Page
Clause
165
12.5 Application rules of sub code for pre-recorded tape
165
12.5.1 Classification of sub code recording
165
12.5.2 Areas along tape longitude
167 12.5.3 Location of pack
169
12.5.4 Classification of catalog number and ISRC recording
169
12.5.5 TOC recording
173 12.6 Application rules of sub code for own-recorded tape
173
12.6.1 Classification of sub code recording
173
12.6.2 Recording function of sub code
175
12.6.3 Areas along tape longitude
183 12.6.4 Location of time code pack
183 12.6.5 Details for recording sub code
195 12.6.6 Rules of assemble-recording
195
12.7 Application rules in playback situation
195 12.7.1 Detection of identification code
195
12.7.2 Mechanical condition
195
12.7.3 Shortening play
195
12.7.4 Display
203
12.7.5 Rules of searching
205
12.7.6 Beginning point of playback after searching
Annexes
207 A Transmissivity of the prism
209
B Measurement method of the force required to open the slider
211
C Abbreviations
213
D Explanations

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SIST EN 61119-1:1999
- 11 -
1119-1 © IEC
INTERNATIONAL ELECTROTECHNICAL COMMISSION
DIGITAL AUDIO TAPE CASSETTE SYSTEM (DAT)
Part 1: Dimensions and characteristics
FOREWORD
The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on
1)
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.
They have the form of recommendations for international use and they are accepted by the National
2)
Committees in that sense.
3) In order to promote international unification, the IEC expresses the wish that all National Committees
should adopt the text of the IEC 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.
This International Standard IEC 1119-1 has been prepared by Sub-Committee 60A: Sound
recording, of IEC Technical Committee No. 60: Recording.
The text of this standard is based on the following documents:
DIS Report on Voting
60A(CO)130 60A(CO)135
Full information on the voting for the approval of this standard can be found in the Voting
Report indicated in the above table.
Annexes A and 8 form an integral part of this standard.
Annexes C and D are for information only.

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SIST EN 61119-1:1999
1119-1©IEC –13
INTRODUCTION
The IEC draws attention to the fact that it is probable that the specifications contained in
this standard are the subject of one or more patents.
The IEC has no precise information on the holders of such patents and cannot supply fur-
ther details, but it is expected that the holders of such patents will be prepared to grant
licences under reasonable and non-discriminatory terms.

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SIST EN 61119-1:1999
-15-
1119-1 © IEC
DIGITAL AUDIO TAPE CASSETTE SYSTEM (DAT)
Part 1: Dimensions and characteristics
1 Scope and object
This part of IEC 1119 is applicable to the digital audio tape (DAT) cassette system that
records and/or plays back digital information such as PCM encoded audio and/or other
data.
This part defines those parameters that affect the compatibility between cassettes and the
associated tape recorders. It is also intended as a reference for manufacturers producing
cassettes and/or tape recorders which are intended to conform with the system described
in this part.
2 Normative references
The following normative documents contain provisions which, through reference in this
text, constitute provisions of this part of IEC 1119. At the time of publication, the editions
indicated were valid. All normative documents are subject to revision, and parties to
agreements based on this part of IEC 1119 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.
Sound system equipment - Part 11: Application of connectors for the
IEC 268-11: 1987,
interconnection of sound system components
Sound system equipment - Part 12: Application of connectors for
IEC 268-12: 1987,
broadcast and similar use
Sound system equipment - Part 15: Preferred matching values for the
IEC 268-15: 1987,
interconnection of sound system components
IEC 958: 1989, Digital audio interface
Digital audio tape cassette system (DAT) - Part 2: DAT calibration tape
IEC 1119-2: 1991,
Digital audio tape cassette system (DAT) - Part 3: DAT tape properties
IEC 1119-3: 1992,
Digital audio tape cassette system (DAT) - Part 4: Method of measure-
IEC 1119-4: 199x,
ment for DAT recorder (under consideration)

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SIST EN 61119-1:1999
- 17 -
1119-1 ©IEC
IEC 1119-5: 199x, Digital audio tape cassette system (DAT) - Part 5: DAT for professional
use (under consideration)
Documentation - International standard recording code (ISRC)
ISO 3901: 1986,
3 Description of the system
The information carrier is a magnetic tape of 3,81 mm width wound on flangeless hubs
which are located in a cassette containing a slider and a lid to protect the tape from
accidental damages. The tape is of the metal powder type or its equivalent. The digital
information is recorded using the helical scanning principle and can be erased by over-
writing. The digital information is read by magnetic heads using an automatic track finding
(ATF) scheme to find and follow tracks. Two track widths and three tape speeds are
defined.
It is possible to record sub code information in a main data area, either with or without
audio signals.
4 Test conditions
Tests and measurements made on the system to verify conformity with the provisions of
this part of IEC 1119 shall be carried out under the following conditions:
- Temperature: 20 °C ± 2 °C
40 % to 60 %
- Relative humidity:
86 kPa to 106 kPa
- Barometric pressure:
- Conditioning before testing: 24 h
5 Mechanical parameters
5.1 Cassette
5.1.1 Dimensions and tolerances
The cassette dimensions and tolerances are specified in figures 2 to 11 on pages 29
to 43.
In these figures, use is made of reference datum planes which are presented in figure 7,
page 39.
C. The X-datum plane is
The Z-datum plane is defined by the datum areas A, B and
defined through the centres of the positioning holes in the datum areas A and B, perpen-
dicular to plane Z. The Y-datum is defined through the centre of the positioning hole in
area A, perpendicular to planes Z and X.

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SIST EN 61119-1:1999
19 —
1119-1 © 1 EC —
Tolerances which are not specified in these figures shall be as in the following table:
Tolerance
(mm)
Length: L
±0,1
6 ?L
30 >_L >6 ±0,2
±0,3
L >30
±1
Angle (°)
5.1.2 Outside view
The outside view is shown in figure 1 on page 27.
5.1.3 Label area
The hatched area given in figure 12 on page 45 is available for the labels of pre-recorded
cassettes.
5.1.4 Window
The window shall be positioned within the label area.
Accidental erasure prevention (AEP)
5.1.5
5.1.5.1 Accidental erasure prevention hole
The cassette shall be provided with an accidental erasure prevention hole as shown in
figure 1 and in accordance with the table in 5.1.5.2.
If an accidental erasure prevention tag is provided, the tag shall be so constructed that it
can withstand an applied force of 0,5 N.
Operation scheme and indication of accidental erasure prevention
5.1.5.2
Accidental erasure prevention may be indicated by a moving part, the colour of which shall
not be red.
The operation scheme of the accidental erasure prevention is specified in the following
table:
Impossible to record
Possible to record
Indication- Indication-
AEP hole
AEP hole
window
window
Open "1"
Closed "0" Closed "0" Open "1"
The position of the indication widow is shown in figure 1, page 27.

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SIST EN 61119-1:1999
– 21 –
1119-1 ©I EC
5.1.6 Recognition holes
The cassette shall be provided with recognition holes (1) to (4) as shown in figure 1.
distinguish magnetic tape types and magnetic tape
(3)
The recognition holes (1), (2) and
thickness as follows:
– "0" . hole closed;
– "1" . hole open.
Hole Hole
Hole
Remarks
(2) (3)
(1)
Metal powder tape or equivalent / 13 gm thickness
0 0 0
0 Metal powder tape or equivalent / thin tape
0 1
0 0 1 Wide track / 13 gm thickness
Wide track / thin tape
0 1 1
1 X X Reserved
Recognition hole (4) distinguishes pre-recorded tape:
– "0" hole closed: non pre-recorded tape;
– "1" hole open: pre-recorded tape.
When tags are provided for recognition, the tags shall be so constructed that they can
0,5 N.
withstand an applied force of
5.1.7 Cassette holding area
2, page 29.
The cassette holding area is shown in figure
5.1.8 Groove for loading grip
The groove for loading grip is shown in figure 2.
5.1.9 Tape begin/end detection
Two tape end detection systems are provided: the prism system and the direct light path
system are provided. The prism system makes use of light path via a prism installed in the
cassette and the direct light path system makes use of direct light path via the cassette
hole provided on the side of the cassette.
shows both the light paths and the prism position for tape end
Figure 6, page 37,
detection.
800 nm
The transmissivity of the magnetic tape for light of wavelengths between
5 % or less.
and 900 nm shall be
The transmissivity of leader and trailer tapes for light of wavelengths between 800 nm
and 900 nm shall be 60 % or more.

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SIST EN 61119-1:1999
1119-1 ©IEC - 23 -
For the direct light path system, the detection accuracy of the tape begin and end is
1)
determined be the transmissivities of the magnetic tape and the leader and trailer
tapes.
For the prism system, the detection accuracy of the tape begin and end is
2)
determined by the transmissivity of the prism installed in the cassette. The
transmissivity of the prism shall be 50 % or more for 800 nm to 900 nm wavelength
light. The definition of the transmissivity of the prism and the measuring method are
shown in annex A.
5.1.10 Lid
5.1.10.1 Lid configuration
The lid configuration is shown in figure 10, page 43.
5.1.10.2 Force to open the lid
to open the lid and release the hub lock as shown in figure 10 shall be 1,2 N
The force P0
(6 x 10-3 Nm) or less.
5.1.10.3 Minimum height of the lid when open
The minimum height of the lid when open shall be 10,9 mm, as shown in figure 10,
page 43.
5.1.10.4 Dimensions of the hub lock and release
The dimensions of the hub lock and release shall be as shown in figure 11, page 43.
Lid return spring
5.1.10.5
The use of two lid return springs is recommended. If a single lid return spring is used, it
shall be placed on the tape supply side.
5.1.11 Slider locks
The use of two slider locks is recommended. If a single slider lock is used a dummy
groove shall be provided.
5.1.11.1 Force to open the slider
The maximum force to open the slider shall be 2 N. The measurement method is shown in
annex B.
5.1.11.2 Release force of slider lock(s)
The release force of the slider lock shall be 0,5 N or less per slider lock at a pushing
stroke of 0,65 mm.
5.1.11.3 Holding force
The holding force of the slider shall be 0,3 N minimum in the open position.

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SIST EN 61119-1:1999
Oc
1119-1 IEC – 25 –
5.1.12
Hub
The shape and dimensions of the hub shall be as shown in figures 8 and 9, page 41.
5.2 Tape
5.2.1
Magnetic tape
5.2.1.1 Magnetic tape length
The length of the magnetic tape shall be determined by the following equation:
[(1 + 0,005) Vt x (T+ 1) x 60/1 000] +ô m
where
Vt is the tape speed (mm/s)
T is the recording time (min)
5.2.1.2 Magnetic tape width
The magnetic tape width shall be 3,81 ô Ô2 mm.
5.2.1.3 Magnetic tape thickness
The magnetic tape thickness shall be 13 gm ± 1 gm.
5.2.2 Leader and trailer tapes
5.2.2.1 Dimensions
The tape length shall be 60 mm ± 5 mm.
mm.
The tape width shall be 3,81
20,05
5.2.2.2 Retaining force
The retaining force of the splice shall be 5 N or more.
The retaining force of the hub clamp shall be 5 N or more.
5.2.3
Tape winding
The recording side of the tape shall face outwards.
5.2.4 Single hub friction torque
The friction torque of a partially or fully wound hub shall not exceed 0,2 x 10-3 Nm.

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SIST EN 61119-1:1999
1119-1 © IEC – 27 –
a) Top view
Notches for incorrect
insertion prevention
Notches for slider lock relaese
b) Bottom view
Accidental erasure
prevention hole
(restorable)
(4)
Slider lock (1)
(1)
Lid locking part
(locked by slider) NOTE - In case of single slider lock,
a dummy groove shall be provided.
c) Back side view
Indication window of accidental erasure
prevention may be placed in this area
IEC I 002192
Figure 1 – Outside view of DAT cassette

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SIST EN 61119-1:1999
1119-1 ©IEC - 29 -
(54)
4,8 49,2 ± 0,2
0,4 max
C 0,2 max.
0,9 min.
1,5 max.
R
R 0,5 max.
c
E
Co E
E
+ 0,2
Groove depth 0,5
C
c'S
E
C^)
^
Y
II)
V
CO
C*)
Cr
A
C
^
^
2 min.
r-
±
-1\ 0,2
+1
II\\\\„`\\\\`\\\\\^^
R 0,5 max. R 1,5 max.
6
1,2 6,8 ± 04
CV
a^ a
N
_1
0
,5
tst
/6C 1003192
NOTES
1 Hs: 10,5 ± 0,2 (at 1 N)
10,9 max. (at free)
Dimensions in millimetres
2 HL Figure 2 - Appearance of cassette, top view (lid closed)

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SIST EN 61119-1:1999
1119-1 ©IEC – 31 –
(55,5)
Window for tape end detector (for prism system)
Window for tape end detector (for prism and direct
light systems)
IEC I004/92
Dimensions in millimetres
Figure 3 - Appearance of cassette, top view (lid open)

---------------------- Page: 22 ----------------------

SIST EN 61119-1:1999
1119-1 © 1 EC — 33 —
45,2 ± 0,2
10 ± 0,1
2
)
Lc)
O O
II
portion to I id
E E Push
,
N
^ V opening
t
^ III
A
- J
.
co
il
%-,i—
C?
0 10 (2x)
^ N O
N
-H
O
CD O
+1 ^
c
vrn
,^ 0 9 ± 0,1 (2x)
-: I
J
C- J
J ^
,E
; Y
E ^
^ Q
ü
^.^éi■
^ A ^- I
-tr o o i
Q + ` 10 ±0,1 J,
-4- N ^ > I
"
^(}^^, n
^
2
± 0,2
47,2
(49,2)
54 ± 0,3
*ws< w
**W
L •
(0 10)
1,5 min.
ole
►^^`^^^^^^^^^^►^^^
\\\\\\\^► ^
."
.mmoni
^^ i
^
4s^ o
07;7 o
-H
12 max. +0,5
0
0 8
to
o
- 0,1
0,8
q
o
Section EE
Section JJ IEC I005/92
Dimensions in millimetres
Figure 4 – Appearance of cassette, bottom view (lid closed)

---------------------- Page: 23 ----------------------

SIST EN 61119-1:1999
-35-
1119-1 © I EC
0 2,5.(4x) (Xl
Recognition hole
o
29 ± 0,15
- 0,15
+ +0,1 2
2,8 x 3 5
0 0
+0,1 025
+0,05 Pe
2,55 x 3,5
0 0 WI
Accidental erasure
prevention hole
0
Datum hole (main),
hi
4So
7 + 0,7
o
(Maximum movement)
ô
E
^ Datum holes (sub)
rn
o
N:
e^
5,6 min.
0
^
PI
T-,
f-
_.
i
x
+0,05
ci
iZS 25
el
o
040
C
0,6
(8 +
Depth from
I ZI
o
^
E
^
E
0 1 min.

Section CC Section CC
Section AA Section BB
,(punch out)
IEC 1076/92
Dimensions in millimetres
Figure 5 - Appearance of cassette, bottom view (lid open)

---------------------- Page: 24 ----------------------

SIST EN 61119-1:1999

37 –
1119-1 © IEC –
6.4 max.
3,9
7,65 ± 0,1 NOTE - Upper shell and lid are removed in the drawing.
[1] Centres of tape guiding posts coincide with main datum hole
centres.
[2] The hub lock brake illustrated is an example.
The hub ratchet illustrated is an example.
[3]
Dimensions in millimetres
Figure 6 – Inner structure of cassette (tape path and light path)

---------------------- Page: 25 ----------------------

SIST EN 61119-1:1999
1119-1 © I EC
- 39 -
!EC 1008192
Dimensions in millimetres
NOTES
1 The crosshatched areas 5 mm in diameter are datum areas.
2 Datum plane Z shall be determined by datum area A, B and C.
3 The line hatched areas, which are support areas, shall be coplanar (or parallel) in datum plane Z with
the following dimensions:
A'=0± 0,05; B'=0± 0,05; C' = 1,1 ± 0,05
Figure 7 - Datum area

---------------------- Page: 26 ----------------------

SIST EN 61119-1:1999

1119-1 ©IEC –41 –
View H
4So 0
0 8,8_ 0,1
1EC 1009/92
Dimensions in millimetres
Figure 8 – Hub
Reel spindle
X
^
E
10
(O
;^^i
n
^.
---
^^^^
/EC 1 010192
^
Clearance a - b = max.1,2
min.1,0
Clearance c - d = max.1,3
Dimensions in millimetres
Figure 9 – Hub clearance and limit of reel spindle height

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SIST EN 61119-1:1999
43 —
1119-1 © I EC —
1EC 1011192
Dimensions in millimetres
Figure 10 – Lid configuration when rotated and opened over 90°
7,5
1EC 1012192

Hub released position
Hub locked position
Dimensions in millimetres
Figure 11 – Hub lock and release

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SIST EN 61119-1:1999
1 119-1 © lEC -
45 -
28,9
28,9
1
5,2
5,2
^--
1
R 0,5 (2x)
1EC 1013192
Dimensions in millimetres
NOTE - When the label is attached to the label area, the size of the cassette shall not exceed the
maximum outer dimensions.
Figure 12 - Label area of pre-recorded cassette

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SIST EN 61119-1:1999

1119-1 ©IEC - 47 -
6 Track configuration and patterns
6.1 Track configuration
The helical track pattern is formed by tape travel and rotation of a pair of inclined heads,
one of which has a plus, and the other a minus azimuth angle.
The track configuration is shown in figure 13 on page 49.
6.1.1 Tape speed and number of tracks per second
The speed of the magnetic tape and the number of tracks recorded per second are as
follows:
Tape speed
Mode Number of tracks/s
mm/s
8,150 ± 0,5 % 200/3
Normal track (normal speed)
% 100/3
Normal track (half speed) 4,075 ± 0,5
200/3
12,225 ± 0,5 %
Wide track
6.1.2 Track angle
The angle of the track at the nominal tape speed of 8,150 mm/s or 4,075 mm/s shall
be 6° 22'59,5" in normal track mode and 6° 23' 29,4" in the wide track mode with the
nominal tape speed of 12,225 mm/s.
6.1.3 Track pitch
The pitch of the tracks shall be 13,591 µm in the normal track mode and 20,41 µm in the
wide track mode.
6.1.4 Track length
The length of the track shall be 23,501 mm in the normal track mode and 23,471 mm in
the wide track mode.
6.1.5 Track centre
The centre of the track shall be 1,905 mm from the reference edge.
6.1.6 Head azimuth
The azimuth angle of the head gap shall be ± (20° ± 15').
6.1.7 Effective recording width
The effective recording width on the magnetic tape shall be 2,613 mm.
Definition of frame
6.1.8
A frame consists of a plus azimuth track and the following minus azimuth track.

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SIST EN 61119-1:1999
1119-1 © I EC - 49 -
6.1.9 Optional tracks
The width of each optional track including the edge guard (0,1 mm) shall be 0,5 mm.
Edge guard II
Tape motion
Optional track II
Main track to optional
r
track guard
INKAS
Plus azimuth 8a
m
6
Minus azimuth 8 b
CO
Main track to optional
track guard
Reference edge
Optional track 1
of tape
Edge guard I
1EC 1 014192
A = tape width
W = effective recording width
L = track length
track pitch
P =
B = track centre
C = optional track I
D = optional track II
edge guard I
E =
F = edge guard II
8 = track angle
8a , 8b = head gap azimuth angle
Figure 13 – Track configuration (view on magnetic sensitive side)

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SIST EN 61119-1:1999
-51 -
1119-1 ©IEC
6.2 Signal allocation
6.2.1 Recording format of track
The format of a track shall be in accordance with the following table.
360 channel bits.
A track consists of 196 blocks, each of which is composed of
bits modulation as specified
Main data blocks and sub data blocks are encoded with 8 - 10
Consequently, one block in these areas corresponds to 288 data bits.
in 9.4 and 10.4.
Area Contents Number of blocks
11
Marginal area Margin 1
2
Sub area 1 Preamble 1
8
Sub data area 1
1
Postamble 1
IBG 1 3 (2)
ATF area 1
5 (7,5)
ATF 1
3 (1,5)
IBG 2
Head
196 blocks
Preamble 2 2
Main area
motion
128
Main data area
3 (2)
ATF area 2 IBG 3
5 (7,5)
ATF 2
3 (1,5)
IBG 4
2
Sub area 2 Preamble 3
8
Sub data area 2
Postamble 2 1
11
Marginal area Margin 2
automatic track finding
ATF:
inter-block gap
IBG:
NOTE - The numbers in parentheses are for wide track mode.
6.2.2 Positioning accuracy
mm in the direction of tape
±0,0267
The positioning accuracy of any track shall be within
2
(± blocks along the track) as measured from the track centre.
width
shall not be erased.
When editing the existing ATF 1 and ATF 2
6.3 Recording signals
The recording signal may be regarded as a succession of channel bits, each of which is of
duration ch.
The waveform of each signal is shown below, and since the significance of the recorded
signal is independent of polarity, either the waveforms given below or their inverses are
permitted.

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SIST EN 61119-1:1999
1119-1 ©IEC - 53 -
Inter-block gap (IBG)
6.3.1
The recording signal of IBG (1, 2, 3 and 4) is a continuous square wave with a succession
of duration 3 Tch as shown below.
3 T
^
3 Toh I 3 Tch ( I 3Tch
• ► ►^ ^
^ • I
(
6.3.2 Preamble, postamble and margin
The recording signal of preamble (1, 2 and 3), postamble (1 and 2) and margin (1 and 2) is
a continuous square wave with a succession of duration as shown below.
ch
Tch Tch Ton Tch Tch c h Tch ch Tch Ton ch Tch
6.3.3 Automatic track finding (ATF), main data area and sub data area
The recording signals of ATF (1 and 2), main data area and sub data area (1 and 2) are
specified below.
ATF: see ATF in 8.1.
Main data area: see main data area format in clause 9.
Sub data area: see sub data area format in clause 10.
7 Recording parameters
Recording level
7.1
7.1.1 Specification
The recording level is specified as a playback output level per unit track width in relation
to the calibration tape. The playback output level of the square wave recorded on the
reference tape by circuitry and heads of the equipment under test should be identical to
that of the calibration tape at the frequencies with wavelengths of 72 Tch , 18 Tch , 12
Tch,
6 Tch and 4 Tch , respectively. Only 72 Tch corresponds to the pilot signal duration.
7.1.2 Measurement method
The playback output level is defined as the fundamental frequency output level of the
playback signal obtained from a tape.

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SIST EN 61119-1:1999
- 55 -
1119-1 ©IEC
The recording level of a system is specified in order to guarantee the compatibility of
cassettes and equipment.
Residual level is not negligible even after overwriting if the previously recorded level was
too high and may cause some trouble. In particular, the remainder of the pilot signal
may cause mistracking. The recording level shall be as close as possible to that of
72 Tch
the calibration tape though its tolerance is not specified. In particular the recording level of
shall not exceed that of the calibration tape.
the pilot signal 72 Tch
In actual equipment, recording signals are continuous square waves with wavelengths
in the ATF area and are 8 to 10 modulated signals with
of 72 Tch , 18 Tch , 12 Tch or 6 Tch
spread spectrum in the main data area and the sub data area. However, the recording
level shall be adjusted using the continuous square waves signals with wavelengths of
12 Tch , 6 Tch and 4 Tch.
72 Tch , 18 Tch ,
7.2 Erasing method
Recorded signals shall be erasable by the overwrite method.
8 Tracking scheme
Automatic track finding (ATF)
8.1
8.1.1 Definition
Tracking is achieved by the automatic track findi
...