EN 61179:1993

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

• Status: Published
• Publication Date: 17-Aug-1993
• Withdrawal Date: 30-Jun-1994
• Technical Committee: CLC/TC 100X - Audio, video and multimedia systems and equipment and related sub-systems
• Drafting Committee: IEC/TC 100 - IEC_TC_100
• Parallel Committee: IEC/TC 100 - IEC_TC_100
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 18-Aug-1993
• Completion Date: 18-Aug-1993
• Ref Project: SIST EN 61179:1999 - Helical-scan digital composite video cassette recording system using 19 mm magnetic tape, format D2 (NTSC, PAL, PAL-M)

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,
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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 -
...