SIST EN 60856:1999

SLOVENSKI STANDARD
SIST EN 60856:1999
01-april-1999
Pre-recorded optical reflective videodisk system "Laser vision" 50 Hz/625 lines –
PAL (IEC 60856:1986)
Pre-recorded optical reflective videodisk system Laser vision 50 Hz/625 lines - PAL
System für bespielte, optisch reflektierende Videoplatten Laser-Vision 50 Hz/625 Zeilen
- PAL
Système de vidéodisque optique réfléchissant préenregistré Laser vision 50 Hz/625
lignes - PAL
Ta slovenski standard je istoveten z: EN 60856:1993
ICS:
33.160.40 Video sistemi Video systems
SIST EN 60856:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60856:1999

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SIST EN 60856:1999

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SIST EN 60856:1999

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SIST EN 60856:1999
NORME
CEI
INTERNATIONALE
IEC
60856
INTERNATIONAL
Première édition
STAN
DARD
First edition
1986-10
Système de vidéodisque optique réfléchissant
préenregistré
«Laser vision» 50 Hz/625 lignes – PAL
Pre-recorded optical reflective videodisk system
"Laser vision" 50 Hz/625 lines – PAL
© IEC 1986 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.
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
V
PRICE CODE
International Electrotechnical Commission
IEC
MensuyHapogHaa 3nenrporexHHVecKaa HOMHCCHn
Pour prix, voir catalogue en vigueur
• •
For price, see current catalogue

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SIST EN 60856:1999
— 3 —
8 56 ^c^, I EC 1986
CONTENTS
Page
5
FOREWORD
PREFACE 5
INTRODUCTION 7
SECTION ONE — GENERAL
Clause
1. Scope 7
2. Object 7
9
3. Standard atmospheric conditions for testing
SECTION TWO — DISK PARAMETERS
4. Mechanical parameters 9
15
5. Optical requirements
17
6. Temperature and humidity requirements
SECTION THREE — RECORDED PARAMETERS
17
7. Audio parameters
17
7.1 Channel applications
17
7.2 Audio subcarrier modulation of main carrier
Audio subcarrier frequencies 17
8.
17
8.1 Type of modulation
19
8.2 Polarity of modulation
19
8.3 Pre-emphasis
19
8.4 Audio compression
19
9. Video parameters
19
9.1 Video signal
21 9.2 Video signal modulation
21
Vertical interval control and address signals 10.
23
10.1 24-bit biphase coded signal
SECTION FOUR — OPERATIONAL SIGNALS
27
11. Definition of playback measurement system
11.1 Optical stylus 27
27
11.2 Measuring set-up
29
11.3 General measurement conditions
12. Operational parameters 29
12.1 Radial signal 29
12.2 Tangential signal 29
29
12.3 High-frequency signal
31
FIGURES
55
APPENDIX A — List of abbreviations
57
APPENDIX B — Audio compression system
65
APPENDIX C Programme status code

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SIST EN 60856:1999
856 c I E C 1986 — 5 —
INTERNATIONAL ELECTROTECHNICAL COMMISSION
PRE-
RECORDED OPTICAL REFLECTIVE
VIDEODISK SYSTEM
"Laser vision" 50 Hz/625 lines — PAL
FOREWORD
1)
The formal decisions or agreements of the I E C 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.
3)
In order to promote international unification, the I E C expresses the wish that all National Committees should adopt
the text of the I E C recommendation for their national rules in so far as national conditions will permit. Any divergence
between the I E C 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 I E C Technical
Committee No. 60: Recording.
The text of this standard is based on the following documents:
Six Months' Rule
Report on Voting
60B(CO)64
60B(CO)72
Further information can be found in the Report on Voting indicated in the table above.

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SIST EN 60856:1999
856 c I E C 1986 — 7
PRE-RECORDED OPTICAL REFLECTIVE
VIDEODISK SYSTEM
"Laser vision" 50 Hz/625 lines — PAL
INTRODUCTION
The optical videodisk system functions as follows:
The information carrier is a disk structure consisting of a transparent substrate, of which one
surface contains the information covered with a reflective coating.
Two such substrates are assembled, information surface against information surface to form an
optical videodisk. One of these two substrates might also be a "blank", characterized by the
absence of information, but in all other mechanical aspects conform to this standard.
The information on the disk is stored in a spiral track starting at the inside at a fixed diameter
and moving to the outside.
The information is read out by a beam of light which passes through the transparent substrate
and is reflected by the information on the encoded surface. The reflected beam is modulated by the
information on the encoded surface.
Within the system two disk formats exist: the CAV disk and the CLV disk. CAV stands for
Constant Angular Velocity and CLV for Constant Linear Velocity.
In the CAV format each revolution corresponds to one complete recorded video frame.
Consequently during readout the disk will rotate at constant angular velocity. A disk thus
recorded makes possible features such as still pictures, slow motion, etc.
In the CLV format the velocity of the information track relative to the readout beam is constant.
Therefore the angular velocity decreases as the readout beam proceeds along the spiral track to the
outside. A disk recorded in this way yields a longer playing time. Features such as still pictures,
however, are not possible.
SECTION ONE — GENERAL
1. Scope
This standard applies to pre-recorded optical reflective videodisks compatible with
50 Hz/625 lines CCIR monochrome and colour coding PAL systems, and defines those
parameters that effect the interchangeability of the disks, excluding limitations of the
programming material and source.
2. Object
To serve as a reference for manufacturers intending to make disks or players compatible
with the optical system described herein.

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SIST EN 60856:1999
856 I E C 1986 — 9—
C,
3. Standard atmospheric conditions for testing
Measurements and mechanical checks shall be carried out at any combination of temper-
ature, humidity and air pressure within the following limits unless otherwise specified for
certain parameters elsewhere in this standard:
Ambient temperature: 15 °C to 35 °C
Relative humidity: 45% to 75%
Air pressure: 86 kPa to 106 kPa
24 h before testing.
Samples shall be conditioned in the testing environment for
SECTION TWO — DISK PARAMETERS
4. Mechanical parameters
Characteristics Method of measurement
Requirements
to be specified and/or conditions
4.1 Thickness in the programme
area:
4.1.1 Thickness of protective See Figure la
transparent layer, (A), Figure 1,
page 31
4.1.2 Thickness of double disk min. = 2.2 mm, see Figure la
(B), Figure 1 max. = 2.8 mm
±
4.2 Outer radius of disk (C), To be measured at 20 1 °C and
48% to 52% relative humidity
Figure 1
— 12-in version 150 + 0.5 mm
— 8-in version 100 + 0.5 mm
4.3 Centre hole (D), Figure 1 0 To be measured with a maximum
35.0 mm
and a minimum plug gauge at
4.3.1 Diameter of centre hole
–0'1
20 + 1 °C and 48% to 52%
relative humidity
4.3.2 Diameter of centre hole for
disk assembled from two single mm
35.0
– 1
disks I _ AI
_
1
!@10.2 IA
I
35.0_ 1 mm
4.3.3 Shape of edges of centre Edges shall be free from burrs
hole
4.4 Label (E), Figure 1
4.4.1 min. = 35 mm Inside diameter of label
(F), Figure 1 max. = 38 mm
4.4.2 Outside diameter of label min. = 86 mm
(G), Figure 1 max. = 100 mm
4.4.3 Thickness of label (H), Such that thickness of disk
in clamping area
Figure 1 (Sub-
clause 4.5.3) is within specifica-
tion
(Table continued on page 11)

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SIST EN 60856:1999
I EC 1986
856
©
Method of measurement
Characteristics
Requirements
and/or conditions
to be specified
4.4.4 Position of label Should not overlap centre hole
4.5 Clamping area (I), Figure 1,
page 31
4.5.1 Inside radius of clamping 20.5 mm
area
4.5.2 Outside radius of clamping 41.5 mm
area
4.5.3 Thickness of disk in clamp- min. = 2.2 mm
including labels (J), max. = 2.9 mm
ing area
Figure 1 .
4.6 Sense of rotation of disk seen Anticlockwise
from read side
4.7 Rotation speed Never to exceed one revolution
per TV frame
4.7.1 Angular velocity for CAV 1 rotation/TV frame
format
4.7.2 Linear velocity for CLV Between 8.4 m/s and 9.5 m/s See Figure 20, page 53
format
See Figure 20
4.7.3 Angular acceleration for Maximum of –0.32 rad/s 2
CLV format
Measured at 1 rotation/TV frame
4.8 Maximum unbalance 1.5 N
4.9 Position of lead-in tracks The space between starting radius
of lead-in tracks and starting
radius of programme area must
be filled with lead-in tracks
<
4.10 Starting radius lead-in 53.5 mm
tracks (K), Figure 1
4.11 Starting radius programme > 55 mm
area (L), Figure 1
4.11.1 Minimum number of pro- 30
gramme tracks
4.12 Maximum radius pro-
gramme area (M), Figure 1
— 12-in version 145 mm
— 8-in version 96 mm
4.13 Position of lead-out tracks The lead-out tracks follow directly
(N), Figure 1 after the end of the pro-
gramme
(Table continued on page 13)

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SIST EN 60856:1999
856 C I E C 1 986 13
Characteristics Method of measurement
Requirements
to be specified and/or conditions
4.14 Minimum size of lead-out
area
4.14.1 For CAV disks 2 mm
4.14.2 For CLV disks 2 mm
4.15 Track pitch anywhere be- min. 1.4 gm
max. 2 gm
tween any two adjacent tracks
Record supported in clamping
4.16 Vertical deviation of pro-
gramme tracks during rotation area over a diameter of 80 mm
at playback speed and measured with the optical "
stylus (see Sub-clause 11.1)
4.16.1 Maximum distance (P) +0.9 mm,
from reference plane to any – 1.2 mm
point of tracks (see Figure 2,
page 33)
4.16.2 Maximum vertical accel- 100 m/s 2 for f < 1.1 kHz See Figure 2
eration
4.16.3 Maximum vertical devia- + 2 gm for f > 1.1 kHz See Figure 2
tion
4.16.4 Maximum vertical vel- 0.18 m/s See Figure 2
ocity
4.17 – 2.5 mm; +1.5 mm supported in clamping Maximum static deflection Record
of disk (Q), Figure 3, page 33 area over a diameter of 80 mm
and measured at outside di-
ameter with reference to hub
plane
4.18 Radial deviation pro- Record supported in clamping
of
gramme tracks during rotation area over a diameter of 80 mm
at playback speed (see Figure 4, and measured with the optical
page 33) stylus (see Sub-clause 11.1)
4.18.1 Maximum deviation (A V) 160 gm
during one revolution (see
Figure 4)
4.18.2 Maximum radial devia- ±0.1 gm for f> 2.2 kHz
tion
4.18.3 Maximum radial acceler- for f< 2.2 kHz
20 m/s 2
ation
(Table continued on page 15)

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SIST EN 60856:1999
— 15 —
856 c I E C 1986
Method of measurement
Characteristics
Requirements
and/or conditions
to be specified
CLV Record supported in clamping
4.19 Tangential deviation of CAV
programme tracks at nominal area over a diameter of 80 mm
and measured with the optical
velocity
stylus (see Sub-clause 11.1)
4.19.1 Maximum time base error
at:
radius 55 mm 12.µs peak-to- 12 µs peak-to-
peak (pp) at peak (pp) at
25 Hz roll- 25 Hz roll-
off with
off with
12 dB/octave 12 dB/octave
radius 145 mm 4.6 µs peak-to- 12 µs peak-to-
peak (pp) at peak (pp) at
25 Hz roll- 9 Hz roll-off
12 dB/
off with with
12 dB/octave octave
4.19.2 Shift between two adja- + 25 ns not applicable
cent tracks
4.20 Mass (in 10-3 kg)
4.20.1 Minimum
8-in version 70
12-in version 70
4.20.2 Maximum
8-in version 280
12-in version 280
4.21 Mass moment of inertia (in 10-3 kg m2)
4.21.1 Minimum
8-in version 0.36
12-in version 0.36
4.21.2 Maximum
8-in version 3.2
3.2
12-in version
A,= 6 328 A (HeNe laser in air)
5. Optical requirements
and a numerical aperture
= 0.40+0.01
5.1 Refractive index See Figure la, page 31
20° max.
5.2 Birefringence of transparent
disk (double pass)
70% Double pass through transparent
5.3 Reflectivity
substrate in unmodulated area.
Includes transmission losses in
the substrate
(Table continued on page 17)

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SIST EN 60856:1999
856 C I E C 1986 17 —
Characteristics Method of measurement
Requirements
to be specified and/or conditions
6. Temperature and humidity Must satisfy all requirements fol- Parameters to be measured
requirements
lowing exposure to a tempera- 20 ± 1 °C and 48% to 52%
ture range of 5 °C to 45 °C at a
relative humidity after a reco-
relative humidity within the very of 24 h following exposure
range of 5% to 90% for a per-
to the specified environment
iod of 4 days
SECTION THREE — RECORDED PARAMETERS
7. Audio parameters
7.1 Channel applications
The disk shall contain two independent audio channels. This offers the possibility of:
a) Stereophonic sound
b)
Monophonic sound — two independent audio programmes
c) Monophonic sound one audio programme on both channels
d)
Use of one or both channels for control or cueing information.
7.2
Audio subcarrier modulation of main carrier
7.2.1 Type of modulation
The audio subcarrier shall be symmetrical double-edge pulsewidth modulated on the main
carrier. (See Philips F. Panter: Modulation, Noise and Spectral Analysis, page 542).
7.2.2
Audio subcarrier amplitude
The level of the audio subcarriers, in the recorded frequency spectrum, shall be –26 ± 1 dB
with respect to the unmodulated main carrier.
8.
Audio subcarrier frequencies
Channel I (left channel in stereo)
f = 43.75 x fH = 683593.75 Hz (nominal)
Channel II (right channel in stereo)
f = 68.25 x fH = 1066406.25 Hz (nominal)
8.1
Type of modulation
The audio signal shall be frequency modulated on the subcarriers with a maximum
deviation of ± 100 kHz for 100% modulation. The instantaneous peak deviation at all times
shall be less than ± 150 kHz.

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SIST EN 60856:1999
856 © I E C 1986. — 19 —
8.2 Polarity of
modulation
Both audio subcarriers shall have the same polarity of modulation which may be positive
or negative.
8.3 Pre-emphasis
The audio signal prior to modulation shall have a pre-emphasis according to Figure 5,
page 35.
8.4 Audio compression
The audio signal before pre-emphasis may be compressed at the option of the programme
maker. In case of compression the-system described in Appendix B shall be used.
9. Video parameters
9.1 Video signal
9.1.1 Video signal standards
The recorded video signal is a 50 Hz/625 lines PAL signal according to CCIR, Report 624
(1974) and additions as specified in Sub-clause 9.1.2.
9.1.2
Video signal pilot burst
On the synchronization level a pilot burst with a frequency of 240 x fH
= 3.75 MHz shall
be superimposed. The peak-to-peak value is 6/7 of the difference between the blanking level
and the peak white level ± 10% (see Figures 6 and 6a, pages 35 and 37).
9.1.3
Vertical Interval Test Signals (VITS)
Vertical Interval Test Signals according to CCIR Recommendation 473-3, Annex I
(see Figures 7 to 10, pages 39 to 41) may be inserted in the lines 19, 20, 332 and 333. The
lines 22 and 335 shall be blanked before optical recording, to enable disk noise measure-
ments.
9.1.4 Address signals
In the video signal, lines 6 through 18 and 319 through 331 are reserved for address or data
signals. For signal specification, see Clause 10. The lines that are not specified have a video
content set at the blanking level and are reserved for future applications. Lines 20, 21 and
333, 334 may contain subtitle data signals; in that case there are no VITS (see Sub-
clause 9.1.3) on lines 20 and 333.
9.1.5 Maximum video level
The maximum luminance level of the video signal shall not exceed 110% and the
maximum chroma saturation shall not exceed 100%.

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SIST EN 60856:1999
E C
856 c I 1986 —21 —
9.1.6 Group delay pre-distortion
To equalize the group delay distortion of the playback low-pass filter, the video group
delay shall be pre-distorted as follows (see Figure 11, page 43) :
f = 0.5 MHz td = 0 ns reference
f = 2.0 MHz td = –10 ± 15 ns
f = 3.0 MHz td = –35 + 15 ns
f = 4.0 MHz td = –85 ± 20 ns
f = 4.43 MHz d = –135 + 20 ns
t
f = 4.8 MHz td = –200 + 50 ns
9.2 Video signal modulation
9.2.1 Type of modulation
The video signal shall be frequency modulated on the main carrier with positive
modulation.
9.2.2 Blanking level frequency
The main carrier frequency corresponding to t 30% blanking level shall be
7.1 MHz + 50 kHz.
Main carrier deviation
9.2.3
The 30% blanking level to + 100% white level deviation shall be 800 + 20 kHz. White
level is the highest frequency.
9.2.4 Video pre-emphasis
The video signal, prior to modulation, shall have a pre-emphasis as shown in Figure 12,
page 45.
10. Vertical interval control and address signals
The code signals on the video disk provide special information, which can be utilized by
the player to control special functions and provide picture frame or time information.
The CAV format has the following types of codes:
1 Lead-in
2. Lead-out
3. Picture numbers
4. Picture stop
5. Chapter numbers
6. Programme status code
7. Users code

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SIST EN 60856:1999
856 I E C 1986 — 23 —
©
On CLV format the codes are:
1. Lead-in
2. Lead-out
3. Programme time code
4. CLV code
5. Chapter numbers
CLV picture number
6.
7. Programme status code
8. Users code
10.1 24-bit biphase coded signal
This signal is inserted in selected video lines during the vertical interval. It is subdivided
into 6 groups of 4 bits and each group can be any hexadecimal word (see Figure 13,
page 45). The first group of 4 bits is the key and starts with a logic one. Each bit cell is
with the digital level between 30% and 100% (see Figure 14, page 47).
10.1.1 Lead-in
The lead-in code indicates the start of the programme (see Sub-clause 4.9). The 24-bit
biphase lead-in code with a hexadecimal value of "88FFFF" is inserted into lines 17, 18, 330
and 331 during at least a number of tracks corresponding to 1.5 mm prior to the active
programme start.
10.1.2 Lead-out
The lead-out code indicates the end of the programme (see Sub-clause 4.13). The 24-bit
biphase lead-out code with a hexadecimal value of "80EEEE" is inserted in lines 17,
18, 330 and 331 during at least 2 mm after the end of the active programme (see Sub-
clause 4.14).
10.1.3 Picture numbers
The picture numbers shall be present during the active programme on CAV disks. They
are unique and in a normal count sequence starting with number 1 at the beginning of the
active programme.
The picture numbers shall be inserted into lines 17 and 18 or in lines 330 and 331,
depending on which field is the first of the picture. The hexadecimal value is : FX,X2X3X4X5.
5 being the least significant digit. The
X 1 through X5 represent the picture number, X
maximum available picture number is 99999.
10.1.4 Picture stop code
On CAV disks, the picture stop code enables the playback equipment to switch auto-
matically to the still picture mode from normal speed or slow motion. The 24-bit biphase
picture stop code with a hexadecimal value of "82CFFF" is inserted in lines 16 and 17 or 329
and 330 of the field immediately following the field in which the 24-bit picture number was
inserted to enable stopping on the selected picture. On CLV disks there is no picture
stop code.

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