EN 61327:1995
(Main)Helical-scan digital composite video cassette recording system using 12,65 mm (0,5 in) magnetic tape - Format D-3
Helical-scan digital composite video cassette recording system using 12,65 mm (0,5 in) magnetic tape - Format D-3
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 12,65 mm (0,5 in) type D-3 cassettes.
Videokassettensystem mit Schrägspuraufzeichnung digitaler Composite-Signale auf Magnetband 12,65 mm (0,5 in) - D3-Format
Système de magnétoscope numérique à chrominance composite à cassette à balayage hélicoïdal utilisant la bande magnétique de 12,65 mm (0,5 in) - Format D-3
Système de magnétoscope numérique à chrominance composite à cassette à balayage hélicoïdal utilisant la bande magnétique de 12,65 mm (0,5 in), format D-3.
Helical-scan digital composite video cassette recording system using 12,65 mm (0,5 in) magnetic tape - Format D-3 (IEC 61327:1995)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-1999
Helical-scan digital composite video cassette recording system using 12,65 mm
(0,5 in) magnetic tape - Format D-3 (IEC 61327:1995)
Helical-scan digital composite video cassette recording system using 12,65 mm (0,5 in)
magnetic tape - Format D-3
Videokassettensystem mit Schrägspuraufzeichnung digitaler Composite-Signale auf
Magnetband 12,65 mm (0,5 in) - D3-Format
Système de magnétoscope numérique à chrominance composite à cassette à balayage
hélicoïdal utilisant la bande magnétique de 12,65 mm (0,5 in) - Format D-3
Ta slovenski standard je istoveten z: EN 61327:1995
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
STANDARD
First edition
1995-07
Système de magnétoscope numérique
à chrominance composite à cassette
à balayage hélicoïdal utilisant la bande
magnétique de 12,65 mm (0,5 in) –
Format D-3
Helical-scan digital composite video
cassette recording system using
12,65 mm (0,5 in) magnetic tape –
Format D-3
© CEI 1995 Droits de reproduction réservés — Copyright - all rights reserved
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1327 ©IEC:1995 — 3 —
CONTENTS
Page
FOREWORD
INTRODUCTION
Clause
1 General
1.1 Scope and object
1.2 Normative references
1.3 Definitions, symbols and abbreviations
2 Technical data
2.1 Environment and test conditions
2.2 Reference tape
2.3 Calibration tape 19
Record locations and dimensions
2.3.1
2.3.2 Calibration signals 19
2.3.3 Purchase 19
3 Video tape cassette
3.1 Mechanical parameters
21 3.1.1 Cassette dimensions
21 3.1.2 Identification of cassettes
21 3.1.3 Tape length, thickness and play times
3.1.4 Coating face
3.1.5 Datum planes
3.1.6 Window and labels
3.1.7 Identification holes
Leader/trailer tape 3.1.8
Reels 3.1.9
3.1.10 Lid 29
3.2 Video tape specification 29
3.2.1 Base 29
3.2.2 Width 29
Width fluctuation 3.2.3
31 3.2.4 Reference edge straightness
3.2.5 Tape thickness
31 3.2.6 Transmissivity
Offset yield strength 3.2.7
Magnetic coating 3.2.8
Coating coercivity 3.2.9
31 3.2.10 Particle orientation
4 Helical recordings
4.1 Tape speed
- 5 -
13270O IEC:1995
Page
Clause
33 4.2 Erase head and record location and dimensions
4.2.1 Erase head
33 4.2.2 Record location and dimensions
4.2.3 Reference edge
33 4.2.4 Track pitch
4.2.5 Flying erase heads
4.3 Helical track record tolerance zones
4.4 Relative positions of recorded signals
4.4.1 Relative positions of the longitudinal tracks
4.4.2 Helical/control track relationship
4.4.3 Programme area reference point
4.5 Gap azimuth
35 Cue track, control track, time and control code track
4.5.1
35 4.5.2 Helical track
4.6 Transport and scanner 37
5 Programme track data arrangement
5.1 Introduction
5.2 Labelling convention
5.3 Sector details 39
5.3.1 Sync block 39
5.3.2 Sync pattern 39
Identification pattern 5.3.3
5.3.4 Data field
5.3.5 Sector preamble
47 5.3.6 Sector postamble
5.4 Edit gaps
47 5.5 Channel coding
5.5.1 Coding rules
49 5.5.2 Data rate and wavelength
5.6 Magnetization
5.6.1 Polarity
5.6.2 Recorded equalization 51
5.6.3 Record level
Video interface 6
51 Encoding parameters 6.1
51 Parallel digital signal interface 6.2
7 Audio interface
7.1 Encoding parameters
7.1.1 Sampling
53 7.1.2 Reference level
7.2 Digital signal interface
– 7 –
1327 ©IEC:1995
Page
Clause
Video processing 8
8.1 Recorded and non-recorded data
Recorded samples of digital active line and lines
8.1.1
of the television frame
8.1.2 Non-recorded data
8.1.3 Source pre-coding
Channel distribution of samples
8.2
Shuffling 8.3
8.3.1 Introduction
8.3.2 Algebraic definition
Field data array 59
8.4
Outer error protection
8.5
61 Order of transmission to inner coding
8.6
9 Audio processing
9.1 Introduction
9.2 Source coding
9.3 Source processing
Introduction 9.3.1
65 Relative audio-video timing
9.3.2
Audio data in fields 9.3.3
9.3.4 Intra-field shuffling
Block shuffling 9.3.5
Audio data word processing
9.3.6
Auxiliary words 9.4
9.4.1 Channel use (CHAN)
9.4.2 Pre-emphasis (PREF)
9.4.3 Audio data word mode (LNGH)
75 9.4.4 Block sync location (S MARK)
77 Field number count (FNCT) for 525/60 system
9.4.5
9.4.6 Edit flag (EFLG)
Outer error protection 79
9.5
9.6 Inner protection
Order of transmission to inner coding
9.7
9.8 Channel code 79
Allocation of audio sectors 9.9
10 Longitudinal tracks
Relative timing 10.1
Time and control code input 10.1.1
81 Time and control code information
10.1.2
Cue information 10.1.3
81 Control track servo pulse
10.1.4
– 9 –
1327 ©IEC:1995
Page
Clause
10.2 Control track
83 10.2.1 Method of recording
83 10.2.2 Servo reference pulse
83 10.2.3 Flux polarity
10.2.4 Flux level
83 10.2.5 Pulse width
83 Servo reference pulse timing
10.2.6
a3.
Colour frame pulse 10.2.7
Video frame pulse 10.2.8
10.3 Cue record
85 10.3.1 Method of recording
10.3.2 Flux level
Time and control code record 10.4
Method of recording 10.4.1
Flux level 10.4.2
10.4.3 Input signal
Figures
Annexes
257 A Cross-tape track measurement technique
B Track pattern during insert editing
Bibliography C
-11 -
1327 ©IEC:1995
INTERNATIONAL ELECTROTECHNICAL COMMISSION
HELICAL-SCAN DIGITAL COMPOSITE VIDEO CASSETTE
RECORDING SYSTEM USING 12,65 mm (0,5 in)
MAGNETIC TAPE – FORMAT D-3
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide 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.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
International Standard IEC 1327 has been prepared by sub-committee 60B: Video
recording, of IEC technical committee 60: Recording.
The text of this standard is based on the following documents:
Report on voting
DIS
60B/272/RVD
60B/255/DIS
rt
Full information on the voting for the approval of this standard can be found in the repo
on voting indicated in the above table.
Annexes A and B form an integral part of this standard.
Annex C is for information only.
1327©IEC:1995 – 13 –
INTRODUCTION
One video channel and four independent audio channels are recorded in digital form. Each
of these channels is designed to be capable of independent editing. The video channel
records and reproduces a composite television signal in the 525-line system with a frame
frequency of 29,97 Hz and 625-line system with a frame frequency of 25,00 Hz.
The video signal may be input and output in either analogue or digital form. The audio
signals may also be input and output in either analogue or digital form. In addition, a cue
audio signal is recorded in analogue form.
Figures 1 and 2 provide block diagrams of the processes involved in the recorder.
1327 ©
IEC:1995 - 15 -
HELICAL-SCAN DIGITAL COMPOSITE VIDEO CASSETTE
RECORDING SYSTEM USING 12,65 mm (0,5 in)
MAGNETIC TAPE – FORMAT D-3
1 General
1.1
Scope and object
This International Standard defines the electrical and mechanical characteristics of equip-
ment which permits the interchangeability of 12,65 mm cassettes containing digitally
recorded composite video programmes.
This 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 12,65 mm (0,5 in) type D-3 cassettes. 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, as well as the longitudinal
cue audio and time and control code tracks. The requirements given relate to 525-line
composite television signals with a frame frequency of 29,97 Hz nominal (hereinafter
referred to as "525/60 system") and to 625-line composite television signals with a frame
frequency of 25,00 Hz (hereinafter referred to as "625/50 system").
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
rties
editions indicated were valid. All normative documents are subject to revision, and pa
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 video tape recorders
IEC 735: 1991, Measuring method for video tape properties
IEC 958: 1989, Digital audio interface
IEC 1179: 1993, Helical-scan digital composite video cassette recording system using
19 mm magnetic tape, format D-2 (NTSC, PAL, PAL-M )
ITU-R Repo rt 624-4: 1990, Characteristics of television systems
ITU-R Recommendation 647-1: 1990, A digital audio interface for broadcasting studios
1327 © IEC:1995 -17 -
Pre-emphasis used on sound-programme circuits
UIT-T Recommendation J.17: 1972,
(Fascicle 111.4)
1.3 Definitions, symbols and abbreviations
For the purpose of this International Standard, the following definitions apply.
1.3.1 ECL: Emitter coupled logic, a family of digital logic integrated circuits. In this
standard, ECL refers to the 10 000 series of logic integrated circuits.
1.3.2 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).
1.3.3 LSB
1) Least significant bit of a word of data.
2) Least significant byte of a data item consisting of two or more bytes.
1.3.4 MSB
1) Most significant bit of data.
Most significant byte of data item consisting of two or more bytes.
2)
1.3.5 ScH: Colour subcarrier to horizontal sync timing relationship.
1.3.6 ECC: Error correcting code.
2 Technical data
2.1 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.
20 ° C ± 1 ° C;
- temperature:
- relative humidity: (50 ± 2) %;
(96 ± 10) kPa;
- barometric pressure:
- tape tension: (0,31 ± 0,05) N; *
not less than 24 h.
- tape conditioning:
The value measured with a tension monitor on the entrance side of the scanner may vary between
manufacturers, but would typically be 0,30 N ± 0,03 N.
1327 ©IEC:1995 - 19 -
2.2 Reference tape
Blank tape to be used for calibration recordings may be purchased from the following
manufacturers:
Company
Matsushita Electric Industrial Co., Ltd.
Audio and Video Systems Division
2-15, Matsuba-cho, Kadoma-city,
Osaka 571 Japan.
TEL.: +8 -6-90 -1161
FAX.: +8 -6-90 -4048
TLX.: +8 -6-52 -4690
Part number
VFM0010
2.3 Calibration tape
Manufacturers of video tape recorders designed for this format specification may sell
calibration tapes meeting the following requirements.*
2.3.1 Record locations and dimensions
Tolerances shown in table 5 or table 6 should be reduced by 50 %.
2.3.2 Calibration signals
Two classes of signals should be recorded on the calibration tapes.
a) A series of conventional test signals.
100 % colour bars
Video:
Audio: 1 kHz tone at -20 dB below full level
1 kHz tone at reference level
Cue:
10 kHz tone at reference level
A signal of constant recorded frequency (i.e., Y the Nyquist frequency) with only
b)
tracks of field 0, segment 0 for the purpose of mechanical alignment.
2.3.3 Purchase
The calibration tape may be purchased from the following manufacturers:
Company
M
...
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