IEC 62330-1:2003

Helical-scan digital video cassette recording system using 12,65 mm (0,5 in) magnetic tape - Format HD-D5 - Part 1: VTR specifications

This part of IEC 62330 specifies the content, format, and recording method of the data blocks containing HD compressed video data defined in part 2, audio, and associated data which form the helical records on 12,65 mm (0,5 in) tape in cassettes as specified in IEC 61835. 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, and also the longitudinal cue audio, and time and control code. One video channel of HD compressed video data and four independent audio channels are recorded in the digital format. Each of these channels is designed to be capable of independent editing. The HD compressed video data are derived from the following HD video signal: 1080 line / 59,94 Hz field frequency interlace system 720 line / 59,94 Hz frame frequency progressive system

General Information

• Status: Published
• Publication Date: 26-May-2003
• ICS: 33.160.40 - Video systems
• ICS: 35.240.99 - IT applications in other fields
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Current Stage: PPUB - Publication issued
• Start Date: 27-May-2003
• Completion Date: 15-Jan-2004

Overview

IEC 62330-1:2003 specifies VTR requirements for the HD‑D5 helical‑scan digital video cassette format using 12,65 mm (0.5 in) magnetic tape. Part 1 defines the content, format and recording methods for helical records that carry HD compressed video, multi‑channel audio and associated data (as defined further in Part 2 and Part 3). The standard covers longitudinal records (tracking, cue audio, time and control code) and supports one HD compressed video channel plus four independent audio channels, each intended for independent editing. Targeted HD signals include 1080/59.94i and 720/59.94p.

Key topics and technical requirements

• Tape and environmental specs: reference and calibration tapes, tape base, thickness, magnetic coating and coercivity, tolerances and test conditions.
• Helical recording geometry: tape speed, track locations, record dimensions, tolerance zones, gap azimuth and scanner/transport requirements.
• Programme track data: sector/field/block layout, sync block formats, labelling and sector preamble/postamble, edit gap handling.
• Video processing and modulation: distribution of HD compressed data across channels/blocks, word/byte arrangement, randomization and outer error protection strategies.
• Audio processing: encoding parameters, AES interface status, auxiliary words, inner/outer error protection and channel allocation for four independent audio tracks.
• Longitudinal tracks: control track timing, cue record, and time & control code formats.
• Measurement and test methods: tape tension, cross‑tape track measurement, scanner design parameters and recommended test procedures.

Applications and practical value

• Ensures interoperability among VTR manufacturers, tape drives and broadcast equipment using the HD‑D5 format.
• Guides product specification and design for professional video tape recorders, transport heads, and scanner assemblies.
• Useful for broadcast engineers, video archivists and post‑production facilities maintaining or integrating tape‑based HD workflows.
• Supports testing labs and QA teams implementing conformance and performance testing (tape tolerances, modulation, error protection).
• Facilitates reliable editing and restoration of HD content stored on 12.65 mm cassette media by defining edit gaps, timecode and control records.

Who should use this standard

• VTR and tape recorder manufacturers
• Broadcast system integrators and equipment buyers
• Archive and media preservation specialists
• Test laboratories and standards compliance teams

Related standards

• IEC 62330‑2 (Compression format) and IEC 62330‑3 (Data stream format) - complementary parts defining compression and data stream structures.
• IEC 61835 - cassette specification referenced for cassette mechanical details.

Keywords: IEC 62330-1, HD‑D5, helical‑scan, digital video cassette, 12.65 mm tape, VTR specifications, HD compressed video, 1080/59.94i, 720/59.94p, four audio channels, longitudinal control.

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
62330-1
First edition
2003-05
Helical-scan digital video cassette recording
system using 12,65 mm (0,5 in) magnetic tape –
Format HD-D5 –
Part 1:
VTR specifications
Reference number
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,
edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
base publication incorporating amendment 1 and the base publication incorporating
amendments 1 and 2.
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INTERNATIONAL IEC
STANDARD
62330-1
First edition
2003-05
Helical-scan digital video cassette recording
system using 12,65 mm (0,5 in) magnetic tape –
Format HD-D5 –
Part 1:
VTR specifications
 IEC 2003  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail]  Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
XB
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 62330-1  IEC:2003(E)
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references. 9
3 Environment and test conditions . 9
3.1 Environment . 9
3.2 Reference tape . 9
3.3 Calibration tape . 9
4 Video tape .10
4.1 Base.10
4.2 Width.10
4.3 Width fluctuation.10
4.4 Tape thickness .10
4.5 Transmissivity.10
4.6 Offset yield strength .10
4.7 Magnetic coating .10
4.8 Coating coercivity .10
4.9 Particle orientation.10
5 Helical recordings .11
5.1 Tape speed .11
5.2 Record location and dimensions .11
5.3 Helical track record tolerance zones .14
5.4 Relative positions of recorded information .15
5.5 Gap azimuth .15
5.6 Transport and scanner.16
6 Programme track data.19
6.1 Introduction .19
6.2 Labelling convention.19
6.3 Sector details .19
6.4 Edit gaps .27
6.5 Channel code .27
6.6 Magnetization .39
7 Video interface .40
8 Audio interface .40
8.1 Encoding parameters.40
8.2 Digital signal interface .40
9 Video processing .40
9.1 Introduction .40
9.2 Recorded data .40
9.3 Channel and video block distribution.42
9.4 Word data arrangement .42
9.5 Video randomize.43
9.6 Outer error protection .43
9.7 Field data array .43
9.8 Order of transmission to inner coding .45

62330-1  IEC:2003(E) – 3 –
10 Audio processing .45
10.1 Introduction .45
10.2 Source coding.45
10.3 Source processing .48
10.4 Auxiliary words .52
10.5 Outer error protection .56
10.6 Inner protection .57
10.7 Order of transmission to inner coding .57
10.8 Channel code .57
10.9 Allocation of audio sectors.57
11 Longitudinal tracks.58
11.1 Relative timing.58
11.2 Control track.58
11.3 Cue record.59
11.4 Time and control code record .59
Annex A (normative) Tape tension .60
Annex B (normative) Cross-tape track measurement technique.61
Annex C (normative) Track pattern during insert editing .65
Bibliography.66
Figure 1 – Record block diagram. 8
Figure 2 – Playback block diagram. 8
Figure 3 – Location and dimensions of recorded tracks .12
Figure 4 – Location of cue and time and control code track record .13
Figure 5 – Location and dimensions of tolerance zones of helical track record .15
Figure 6 – A possible scanner configuration .17
Figure 7 – A possible longitudinal head location and tape wrap.18
Figure 8 – Sector arrangement on helical track .19
Figure 9 – Sync block format.20
Figure 10 – Sync block identification format .21
Figure 11 – Track, segment and field numbers .22
Figure 12 – Sync block number .23
Figure 13 – Sector preamble and postamble .26
Figure 14 – Reconfigured data .41
Figure 15 – Channel and video block distribution .42
Figure 16 – Field data array .44
Figure 17 – Audio data block field array .47
Figure 18 – Audio data block layout .50
Figure 19 – Audio data block arrangement .51
Figure 20 – Digital audio word to byte conversion .52
Figure 21 – Audio data block auxiliary data .53
Figure 22 – Audio channel arrangement.57
Figure 23 – Recorded control record waveform timing.58

– 4 – 62330-1  IEC:2003(E)
Figure B.1 – Correction factors (actual tape speed and tension).63
Figure B.2 – Cross-tape measurement technique .63
Figure B.3 – Track location error plot (example).64
Figure C.1 – A typical pattern during insert editing .65
Table 1 – Record location and dimensions .14
Table 2 – Parameters for a possible scanner design .16
Table 3 – 8-14 modulation (CDS≥0) .29
Table 4 – 8-14 modulation (CDS≤0) .34
Table 5 – Priority of modulation code selection (end DSV = –2) .39
Table 6 – Priority of modulation code selection (end DSV = +2) .39
Table 7 – Data rate and wavelength .39
Table 8 – Signal format information.41
Table 9 – AES status data (Byte 0) .48
Table 10 – AES status data (Byte 1).48
Table 11 – Audio data word mode .51
Table 12 – Channel use control word .54
Table 13 – Pre-emphasis control word .54
Table 14 – Word mode control word .55
Table 15 – FNCT mode .55
Table B.1 – Nomenclature and calculation of track location error .62

62330-1  IEC:2003(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HELICAL-SCAN DIGITAL VIDEO CASSETTE RECORDING SYSTEM
USING 12,65 mm (0,5 in) MAGNETIC TAPE – FORMAT HD-D5 –
Part 1: VTR specifications
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 co-operation 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 express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, 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.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62330-1 has been prepared by Technical Area 6: Higher data rate
storage media and equipment of IEC technical committee 100: Audio, video and multimedia
systems and equipment.
It was submitted to the national committees for voting under the Fast Track Procedure as the
following documents:
CDV Report on voting
100/504/CDV 100/603/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
2008. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
– 6 – 62330-1  IEC:2003(E)
IEC 62330 consists of the following parts, under the general title Helical-scan digital video
cassette recording system using 12,65 mm (0,5 in) magnetic tape – Format HD-D5.
Part 1: VTR specifications
Part 2: Compression format
Part 3: Data stream format
This part 1 describes the VTR specifications which are tape, magnetization, helical recording,
modulation method and basic system data for high definition video compressed data on 29,97
or 59,94 frame rate.
Part 2 describes the specifications for encoding process and data format for 1080i and 720p
systems.
Part 3 describes the specifications for transmission of HD-D5 compressed video and audio
data stream over 360 Mb/s serial digital interface.

62330-1  IEC:2003(E) – 7 –
HELICAL-SCAN DIGITAL VIDEO CASSETTE RECORDING SYSTEM
USING 12,65 mm (0,5 in) MAGNETIC TAPE – FORMAT HD-D5 –
Part 1: VTR specifications
1 Scope
This part of IEC 62330 specifies the content, format, and recording method of the data blocks
containing HD compressed video data defined in part 2, audio, and associated data which
form the helical records on 12,65 mm (0,5 in) tape in cassettes as specified in IEC 61835.
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, and also the longitudinal cue audio, and time and control code.
One video channel of HD compressed video data and four independent audio channels are
recorded in the digital format. Each of these channels is designed to be capable of
independent editing.
The HD compressed video data are derived from the following HD video signal:
• 1080 line / 59,94 Hz field frequency interlace system
• 720 line / 59,94 Hz frame frequency progressive system
Figure 1 and Figure 2 show block diagrams of the processes involved in the recorder.

– 8 – 62330-1  IEC:2003(E)
AUDIO
(ANALOG) ANALOG/ INTRA- OUTER
BLOCK
DIGITAL FIELD ECC
SHUFFLE
INTERFACE SHUFFLE ENCODER
(DIGITAL AES/EBU)
VIDEO
OUTER INTRA-
CHANNEL
COMPRESSED
DEMUX ECC FIELD
HD DIGITAL DATA
SWITCH ENCODER SHUFFLE
RECORD
INNER
HELICAL CHANNEL DATA
SYNC/
DRIVER ECC
TRACK CODER MUX
ID GEN.
AND HEAD ENCODER
CONTROL TRACK
CONTROL TRACK
INFORMATION
GEN.
EXT
TIME AND
T.C. TIME CODE RECORD
CONTROL
GEN. DRIVERS
CODE
AND HEADS
(ANALOG)
CUE REC. AMP
Figure 1 – Record block diagram
AUDIO
(ANALOG)
DIGITAL/ AUDIO INTRA- OUTER
BLOCK
ANALOG ERROR FIELD ECC
DESHUFFLE
INTERFACE CONCEAL DESHUFFLE DECODER
(DIGITAL AES/EBU)
VIDEO
VIDEO CHANNEL OUTER INTRA-
COMPRESSED
ERROR MUX ECC FIELD
HD DIGITAL DATA
CONCEAL SWITCH DECODER DESHUFFLE
PLAYBACK
INNER
HELICAL HEAD SYNC CHANNEL DATA
ECC
TRACK PRE AMP DETEC DECODER DEMUX
DECODER
AND EQ.
CONTROL TRACK CONTROL TRACK
INFORMATION   P.B.
T.C.
TIME AND TIME CODE HEADS AND
CONTROL CODE READER PLAYBACK
INTERFACE
(ANALOG)
CUE P.B. AMP
Figure 2 – Playback block diagram

62330-1  IEC:2003(E) – 9 –
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60461:2001, Time and control code for video tape recorders
IEC 60958, Digital audio interface
IEC 61835, Helical-scan digital component video cassette recording system using 12,65 mm
(0,5 in) magnet tape – Format D-5
ITU-R BS. 647 A digital audio interface for broadcasting studios
SMPTE RP 155:1995, Audio levels and Indicators for Digital Audio Records on Digital
Television Tape Recorders
3 Environment and test conditions
3.1 Environment
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 from 86 kPa to 106 kPa
Tape conditioning not less than 24 h
Centre tape tension 0,31 N ±0,05 N (see Annex A)
3.2 Reference tape
Blank tape for reference recordings should be available from any source meeting the tape
characteristics as portrayed by this standard.
3.3 Calibration tape
The calibration tapes meeting the requirements of 3.3.1 and Clause 4 should be available
from manufacturers who produce DTTRs and players in accordance with this standard.
3.3.1 Record locations and dimensions
Tolerances shown in Table 1 will be reduced by 50 %.
3.3.2 Calibration signals
Two sets of signals should be recorded on the calibration tape:
a) Video: 100 % colour bars
Audio: 1 kHz tone at 20 dB below full scale on each of audio channels
Cue: 1 kHz tone at reference level; 10 kHz tone at reference level

– 10 – 62330-1  IEC:2003(E)
b) A signal of constant recorded frequency (i.e. one-half the Nyquist frequency) shall be
recorded only on tracks of field 0, segment 0 for the purpose of mechanical alignment.
Recording level should conform to 6.6.3.
4 Video tape
4.1 Base
The base material shall be polyester or equivalent.
4.2 Width
The tape width shall be 12,650 mm ±0,008 mm.
The tape, covered with glass, is measured without tension at a minimum of five different
positions along the tape using a calibrated comparator having an accuracy of 0,001 mm
(1 μm). The tape width is defined as the average of the five readings.
4.3 Width fluctuation
Tape width fluctuation shall not exceed 5 μm peak to peak. Measurement of tape width
fluctuation shall be taken over a tape length of 900 mm. The value of tape width fluctuation
shall be evaluated by measuring the tape width at 10 points, each separated by a distance of
100 mm.
4.4 Tape thickness
Two types of tape thickness shall be permitted by this standard. The first tape thickness shall
be 10,2 μm to 11,0 μm (referred to as 11 μm); the second tape thickness shall be 13,0 μm to
14,0 μm (referred to as 14 μm).
4.5 Transmissivity
Transmissivity shall be less than 5 %, measured over the range of wavelengths 800 nm to
900 nm.
4.6 Offset yield strength
The offset yield strength shall be greater than 9 N for 11 μm tape and 10 N for 14 μm tape.
The force required to produce 0,2 % elongation of a 1 000 mm test sample with a pull rate of
a 10 mm per minute shall be used to confirm the offset yield strength. The line beginning at
0,2 % elongation parallel to the initial tangential slope is drawn and then read at the point of
intersection of the line and the stress-strain curve.
4.7 Magnetic coating
The magnetic layer of the tape shall consist of a coating of metal particles or equivalent.
4.8 Coating coercivity
The coating coercivity shall be a class 1 800 (144 000 A/m) with an applied field of
400 000 A/m (5 000 Oe) as measured by a 50 Hz or 60 Hz B-H meter or vibrating sample
magnetometer (VSM).
4.9 Particle orientation
The metal particles shall be longitudinally oriented.

62330-1  IEC:2003(E) – 11 –
5 Helical recordings
5.1 Tape speed
The tape speed shall be 167,228 mm/s. The tolerance shall be ±0,2 %.
5.2 Record location and dimensions
5.2.1 The format requires full-width erasure for continuous recording and flying erasure for
insert editing.
5.2.2 Record location and dimensions for continuous recording shall be as specified in
Figure 3, Figure 4 and Table 1. In recording, sector locations on each helical track
shall be contained within the tolerance specified in Figure 3 and Table 1.
5.2.3 The reference edge of the tape for record location dimensions specified in this
standard shall be the lower edge as shown in Figure 3. The magnetic coating, with
the direction of tape travel as shown in Figure 3, is on the side facing the observer
(measuring techniques are shown in Annex B).
5.2.4 As indicated in Figure 3, this standard anticipates a zero guard band between
recorded tracks, and the record head width should be equivalent to the track pitch of
20 μm. The scanner head configuration should be chosen so that the recorded track
widths are contained within the limits of 18 μm to 22 μm.
5.2.5 In insert editing, this standard provides a guard band of 2 μm (nominal) between the
previously recorded track and the inserted track at editing points only. A typical track
pattern for insert editing is shown in Figure C.1.

Direction of head motion
K0
K1
A V0
V1 A4 A3 2 A1
X1
X2
X3
X4
X5
X6
L
M M M M
– 12 – 62330-1  IEC:2003(E)
Direction of tape travel
Cue track
Cue Track
A
Control track
Control Track
Time and control code track
Time and Control Code Track
θ
Reference edge
α0
α1
α1
α0
Detail A
NOTE 1 A1, A2, A3, and A4 are audio sectors.
NOTE 2 V0 and V1 are video sectors.
NOTE 3 Tape viewed from magnetic coating side.
NOTE 4 Dimensions X1 to X6 are determined by the programme reference point as defined in Figure 4.
Figure 3 – Location and dimensions of recorded tracks
I
Y
A
B
C
D
E
F
G
H
W
62330-1  IEC:2003(E) – 13 –
P2
CUE TRACK
P1
HEAD MOTION
B
A
CONTROL TRACK
TAPE
TRAVEL
TIME AND CONTROL CODE TRACK
SERVO
REFERENCE
PULSE
RECORDING-CURRENT
WAVEFORM
NSSN
PROGRAMME REFERENCE
POINT
RECORDING-CURRENT
WAVEFORM
VIDEO
SECTOR
C
PREAMBLE
X1
DETAIL A
CONTROL
PROGRAMME
TRACK
REFERENCE POINT
X1
REFERENCE EDGE
TIME AND CONTROL CODE TRACK
DETAIL B
LOCATION OF
VIDEO START
DETAIL C
Figure 4 – Location of cue and time and control code track record
Y (BASIC)
Y
– 14 – 62330-1  IEC:2003(E)
Table 1 – Record location and dimensions
Dimensions in millimetres
Dimensions Nominal Tolerance
A Time and control code track lower edge 0 Basic
B Time and control code track upper edge 0,450 ±0,050
C Control track lower edge 0,900 ±0,050
D Control track upper edge 1,300 ±0,050
E Programme area lower edge 1,629 Derived
F Programme area width 10,020 Derived
G Cue audio track lower edge 11,950 ±0,050
H Cue audio track upper edge 12,550 ±0,050
I Helical track pitch 0,0200 Ref
K0 Video sector 0 length 55,458 Derived
K1 Video sector 1 length 55,391 Derived
L Helical track total length 116,397 Derived
M Audio sector length 0,936 Derived
P1 Control track reference pulse to programme reference point (see 180,549 ±0,050
Figure 4)
P2 183,400 ±0,100
Cue/time and control code signal, start of code word, to programme
reference point (see Figure 4)
X1 0 ±0,050
Location of start of video sector V0
X2 55,752 ±0,050
1)
Location of start of audio sector A1
X3 57,049 ±0,050
1)
Location of start of audio sector A2
X4 58,345 ±0,050
1)
Location of start of audio sector A3
X5 59,642 ±0,050
1)
Location of start of audio sector A4
X6 60,938 ±0,050
Location of start of video sector V1
Y 1,640 Basic
Programme reference point
θ Track angle  4,938 4 ° Basic
Azimuth angle (track 0)
α0 - 20,038 ° ± 0,150 °
Azimuth angle (track 1)
± 0,150 °
α1 19,962 °
NOTE  Measurements shall be made under the conditions specified in 3.1. The measurements shall be
corrected to account for actual tape speed (see Figures B.1 and B.2).
1)
Audio channel numbers vary.
5.3 Helical track record tolerance zones
The lower edges of any eight consecutive tracks starting at the first track in each video frame
shall be contained within the pattern of the eight tolerance zones established in Figure 5.
Each zone is defined by two parallel lines which are inclined with respect to the tape
reference edge at an angle of 4,938 4° basic.
The centre lines of all zones shall be spaced apart 0,020 0 mm basic. The width of zones 1 to
3 and 5 to 8 shall be 0,006 mm basic. The width of zone 4 shall be 0,004 mm basic. These
zones are established to contain track angle errors, track straightness errors, and vertical
head offset tolerance (measuring technique is shown in Annex B).

HEAD MOTION
62330-1  IEC:2003(E) – 15 –
TAPE TRAVEL
NOTE 3
ZONE ZONE ZONE ZONE ZONE ZONE ZONE ZONE
1 2 3 4 5 6 7 8
TRACK LOWER EDGES
TAPE REFERENCE EDGE
NOTE 1 Tolerance zone centrelines.
NOTE 2 0,020 0
NOTE 3 4,938 4°
NOTE 4 All dimensions in millimetres.
Figure 5 – Location and dimensions of tolerance zones of helical track record
5.4 Relative positions of recorded information
5.4.1 Relative positions of longitudinal tracks
Audio, video, control track, time and control code, and cue track with information intended to
be time coincident shall be positioned as shown in Figure 3 and Figure 4.
5.4.2 Programme area reference point
The programme area reference point is determined by the intersection of a line parallel to the
reference edge of the tape at a distance Y from the reference edge and the centre line of the
first track in each video field (segment 0, track 0). (See Figure 3 and Figure 4.)
The end of the preamble and start of the video sector are located at the programme area
reference point, and the tolerance is dimension X1. The locations are shown in Figure 3 and
Figure 4; dimensions X1 and Y are in Table 1. The relationship between sectors and contents
of each sector is specified in Clause 6.
5.5 Gap azimuth
5.5.1 Cue track, control track, time code track
The azimuth angle of the cue, control track, and time and control code head gaps used to
produce longitudinal track records shall be perpendicular to the track record.
OT
N E 1
NOTE 1
NOTE 1
NOTE 1
NOTE 1
NOTE 1
NOTE 1
OT
N E 1
NOTE 2
0,006
0,006
0,006
0 04
,0
0,006
0,006
0,006
0,006
– 16 – 62330-1  IEC:2003(E)
5.5.2 Helical track
The azimuth of the head gaps used for the helical track shall be inclined at angles α and α
0 1
as specified in Table 1, with respect to a line perpendicular to the helical track. The azimuth
of the first track of every field (segment 0, track 0) shall be oriented in the counterclockwise
direction with respect to a line perpendicular to the helical track direction when viewed from
the side of tape containing the magnetic record.
5.6 Transport and scanner
The effective drum diameter, tape tension, helix angle, and tape speed taken together
determine the track angle. Different methods of design and/or variations in drum diameter and
tape tension can produce equivalent recordings for interchange purposes.
One possible configuration of the transport uses a scanner with an effective diameter of
76,000 mm. Scanner rotation is in the same direction as tape motion during normal playback
mode. Data is recorded by two groups of four heads mounted 180° apart. Figure 6 shows one
possible mechanical configuration of the scanner, and Table 2 shows the corresponding
mechanical parameters. Figure 7 shows the relationship between the longitudinal heads and
the scanner. Other mechanical configurations are allowable provided the same footprint of
recorded information is produced on tape.
Erase heads are described in 5.2.1 and Figure 6.
Table 2 – Parameters for a possible scanner design
Parameters
Scanner rotation speed (rps) 90/1,001
Number of tracks per rotation 8
Drum diameter (mm) 76,000
Centre span tension (N) 0,31
Helix angle (degrees) 4,9000
Effective wrap angle (degrees) 176,9
Scanner circumferential speed (m/s) 21,5
H1,H3 over wrap head entrance 14,1
(degrees)
H1,H3 over wrap head exit (degrees) 6
Angular relationship H1 – H4: 13,570
(degrees) H2 – H4: 9,047
H3 – H4: 4,523
H5 – H8: 13,570
H6 – H8: 9,047
H7 – H8: 4,523
H4 – H8: 180,000
Vertical displacement H1 – H4: 0,054
(mm) H2 – H4: 0,036
H3 – H4: 0,018
H5 – H8: 0,054
H6 – H8: 0,036
H7 – H8: 0,018
42,0
Maximum tip projection (μm)
Record head track width (μm)
62330-1  IEC:2003(E) – 17 –
H6 H7
H5
H8
H10
176,9°
EFFECTIVE
WRAP
POLE TIP
ANGLE
ROTATION
197,0°
TOTAL
WRAP
ANGLE
TAPE
TAPE
TRAVEL
TRAVEL
H9
H4 H1
H3 H2
H1-H8 : RECORDING HEAD TIPS
H9-H10: FLYING ERASE HEAD TIPS
4,523°
(INSERT EDITING ONLY)
9,047°
13,570°
41,785°
76,000 mm(NOMINAL)
DRUM DIAMETER
UPPER DRUM
H9
CENTRE OF H9 H10
H4
36,6
18,0
H3
CENTRE DRUM
36,0
H2
54,0
H1
LOWER DRUM
(Unit: μm)
Figure 6 – A possible scanner configuration

– 18 – 62330-1  IEC:2003(E)
197,0
176,9
TOTAL
EFFECTIVE
WRAP
WRAP
ANGLE
ANGLE
59,3 mm
POLE TIP
ROTATION
TAPE
TRAVEL
CONTROL HEAD
TOP VIEW
PROGRAMME
59,3 REFERENCE
END OF
POINT
HELICAL
TRACK
4,9000
CENTRE
LINE
1,640
3,98(6 )
180,549
UNWRAPPED, VIEWED MAGNETIC COATING SIDE
Figure 7 – A possible longitudinal head location and tape wrap

62330-1  IEC:2003(E) – 19 –
6 Programme track data
6.1 Introduction
Each HD TV field (1080/60i) or frame (720/60p) is recorded on 12 tracks.
The helical tracks contain digital data from the video channel and four audio channels. Each
track contains a video sector followed by four audio sectors corresponding to four audio
channels and followed by a second video sector, recorded in that order. An edit gap between
sectors accommodates timing errors during editing. Figure 8 shows the arrangement of video
and audio sectors on the tape.
VIDEO SECTOR 0 AUDIO SECTOR AUDIO SECTOR
HEAD EDIT GAP EDIT GAP EDIT GAP
PE P E P
T
(256 SYNC BLOCKS) (4 SYNC BLOCKS) (4 SYNC BLOCKS)
AUDIO SECTOR AUDIO SECTOR VIDEO SECTOR 1
EDIT GAP EDIT GAP HEAD
P E P E P
E
(4 SYNC BLOCKS) (4 SYNC BLOCKS) (256 SYNC BLOCKS)
T Track preamble (58 bytes)
E In-track preamble
P Postamble (4 bytes)
Sync block: 97 bytes
Edit gap: 162bytes nominal
Figure 8 – Sector arrangement on helical track
6.2 Labelling convention
The least significant bit is written on the left and first recorded to tape.
The lowest numbered byte is shown at the left/top and is the first encountered in the input
data stream.
Byte values are expressed in hexadecimal notation unless otherwise noted. An h subscript
indicates hexadecimal value.
6.3 Sector details
Each sector (audio or video) is divided into the following elements:
– preamble containing clock run-up sequence, sync pattern, identification pattern and fill
pattern;
– 20 – 62330-1  IEC:2003(E)
– sync blocks containing sync pattern and identification pattern, followed by a fixed length
data block with error control;
– postamble containing sync pattern and identification pattern.
6.3.1 Sync block
The sync block format is common to both audio and video sectors. Each sync block contains a
sync pattern (2 bytes) and an inner code block. Each inner block contains an identification
pattern (2 bytes) and 85 data bytes of video, audio, or outer check bytes followed by 8 inner
check bytes.
The inner code block contains the two bytes of the identification pattern together with 85 data
bytes. Figure 9 shows the sync block format.
01 2 3 4 5 6 86 87 88 89 90 91 92 93 94 95 96
S S ID ID B B B B B B K K K K K K K K
0 1 0 1 84 83 82 2 1 0 7 6 5 4 3 2 1 0
SYNC ID DATA INNER CHECK
2 2 85 8
INNER CODE BLOCK (95 BYTES)
97 BYTES
Figure 9 – Sync block format
6.3.2 Sync pattern
a) Length: 16 bits (2 bytes).
b) Pattern: 97F1 (in hexadecimal notation).
LSB MSB
Byte 0  - 1 110 100 1
Byte 1  - 1 000 111 1
c) Protection: none.
d) Randomization: none.
6.3.3 Identification pattern
As illustrated in Figure 10, the first two bytes of each inner block are used for identification of
sync block, television field, segment (group of helical tracks scanned simultaneously), sector
(portion of a track), and helical track. Bits 1 to 6 of the second byte (byte 3 of sync block) of
the identification pattern identify the track. Bit 7 of the second byte (byte 3) identifies a sector
on the helical track (see Figure 11).
a) Length: 16 bits (2 bytes).
b) Arrangement: the sync block number (byte 2 and the bit 0 of byte 3) follows a coded
sequence along the track. Figure 12 shows the sequence of the sync block numbers.
The sector ID (bits 1to7 of byte 3) identifies a particular sector.

62330-1  IEC:2003(E) – 21 –
The segment count is modulo 3. The field count for video sectors is modulo 4 (VF = 0 in
byte 3). The field count for audio sectors is modulo 4 (for AF and AF in byte 3) and AF
0 1 2
(in byte 3) is used for the identification of the five field sequences.
c) Video field identification: The field address VF , VF , VF (bits 4, 5, and 6 of the byte 3)
0 1 2
for video sync blocks shall identify the field sequence as shown below. In the case of
composite signal input, the field address shall identify the four-field colour sequences as
defined in ITU Report 624 and have the values as shown below:
Component signal input Composite signal VF VF VF
0 1 2
Field 1 Colour frame A, field I 0 0 0
Field 2 Colour frame A, field II 1 0 0
Field 1 Colour frame B, field III 0 1 0
Field 2 Colour frame B, field IV 1 1 0
ARRANGEMENT
BYTE 2 BYTE 3
9 BITS 7 BITS
SYNC BLOCK NUMBER SECTOR ID
SYNC BLOCK NUMBER
BYTE 2
0123 456 7
LSB MSB
B B B B B B B B
0 1 2 3 4 5 6 7
PART OF SYNC BLOCK NUMBER
SECTOR ID FOR VIDEO SYNC BLOCKS
BYTE 3
01234 567
LSB MSB
B S S CVF VF VF SEC
8 0 1 0 1 2
PART OF MSB OF
SYNC BLOCK TRACK =0
SECTOR NUMBER
NUMBER SEGMENT NUMBER NUMBER FIELD NUMBER
SECTOR ID FOR AUDIO SYNC BLOCKS
BYTE 3
012 34567
LSB MSB
B S S CAF AF AF SEC
8 0 1 0 1 2
PART OF
MSB OF
SYNC BLOCK TRACK
NUMBER SEGMENT NUMBER NUMBER FIELD NUMBER SECTOR NUMBER
= 0 : 801 SAMPLES
= 1 : 800 SAMPLES
Figure 10 – Sync block identification format

HEAD MOT ON
I
F=1 = C=1 T=3
S 2
F=1 C=1 T=
S=2 2
F=1 C=0
S=2 T=1
F=1 C=0
S=2 T=0
F=1 C=1
S=1 T=3
F=1 C=1
S=1 T=2
F=1 C=0
S=1 T=1
F=1
S=1 C=0 T=0
F=1
S=0 C=1 T=3
F=1
S=0 C=1 T=2
F=1 S=0 C=0 T=1
F=1 S=0 C=0 T=0
F=0 S=2 C=1 T=3
F=0 S=2 C=1 T=2
F=0 S=2 C=0 T=1
F=0 S=2 C=0 T=0
F=0 S=1 C=1 T=3
F=0 =1 C=1 T=2
S
F=0 C=0 T
S=1 =1
F=0 C=0
S=1 T=0
F=0 C=1
S=0 T=3
F=0
S=0 C=1 T=2
F=0
S=0 C=0 T=1
F=0 S=0 C=0 T=0
– 22 – 62330-1  IEC:2003(E)
TAPE TRAVEL END OF VIDEO FIELD
SEC=1
SEC=0
START OF
VIDEO FIELD
NOTES
1 F = field number (0, 1, 2, 3).
2 S = segment number (0, 1, 2).
3 SEC = sector number; C = MSB of track number (0, 1).
4 T = track number (0, 1, 2, 3). LSB of track number is identified by the azimuth angle.
5 Audio sectors are not shown.
Figure 11 – Track, segment and field numbers

62330-1  IEC:2003(E) – 23 –
EDIT GAP
POST
POST
1C4
AMBLE AMBLE
OFF
1C3
OFE
AUDIO 1C2
OFD
SECTOR 1C1
OFC
1C0
VIDEO .
IN-TRACK
SECTOR 1 .
1BF
PREAMBLE
.
.
EDIT GAP
.
POST
AMBLE
AUDIO 182 000
SECTOR 181
IN-TRACK
1FF
PREAMBLE
SEC=1
IN-TRACK
EDIT GAP
SEC=0 17F
PREAMBLE
POST
1C4
EDIT GAP AMBLE
1C3
POST
AUDIO 1C2
AMBLE
SECTOR 4 1C1
OFF 1C0
OFE
IN-TRACK
1BF
OFD
PREAMBLE
OFC
EDIT GAP
.
VIDEO
.
POST AMBLE 184
SECTOR 0
.
AUDIO 182
SECTOR 181
IN-TRACK
TRACK 17F
1FF PREAMBLE
PREAMBLE
NOTE Sync block number shows in hexadecimal notation.
Figure 12 – Sync block number
– 24 – 62330-1  IEC:2003(E)
d) Audio field identification: The field address AF and AF of the audio sync block (bits 4
0 1
and 5 of byte 3) shall identify four-fields sequence as shown below. The sequence shall be
identical for the system. When audio sectors are edited, the four-fields sequence shall be
maintained.
Field AF AF
0 1
m 0 0
m+1 0 1
m+2 1 0
m+3 1 1
The field address AF of the audio sync block (bit 6 of byte 3) shall identify a five-field
sequence for the number of audio samples in the current field as shown below. When
audio sectors are edited, the five-field sequence shall be maintained (see 10.3.6 d)).
Field AF Number of
audio samples
n0 801
n+1 0 801
n+2 0 801
n+3 0 801
n+4 1 800
e) Protection: the identification pattern is protected by an inner code block.
f) Randomization: the identification pattern is randomized before being channel coded.
The randomizing is equivalent to performing the exclusive-OR operation between the
serial data stream and serial stream generated by the polynomial function
8 4 3 2
x + x + x + x + 1 (in GF(2))
The first term is the most significant and the first to enter the division computation.
The polynomial generator noted above is preset to 15 at the first byte of the identification
h
pattern and continues to cycle until the end of the sync block.
6.3.4 Data field
This block is used for all video and audio data and the associated error correction data.
a) Length: 1 inner code block. The inner code block contains 95 bytes consisting of two
identification pattern bytes, 85 data bytes (outer ECC check bytes are considered data),
plus 8 inner ECC check bytes.
b) Arrangement: see Figure 9.
c) Interleaving: none.
d) Protection: inner ECC code.
Type: Reed-Solomon.
Galois Field: GF(256).
8 4 3 2
Field generator polynomial: x + x + x + x + 1,
i
where x are place keeping variables in GF(2), the binary field.
Order of use: left-most term is most significant, "oldest" in time computationally, and
written to tape first.
Code Generator Polynomial in GF(256) is:
2 3 4 5 6 7
G(x) = (x+1)(x+a)(x+a )(x+a )(x+a )(x+a )(x+a )(x+a )

62330-1  IEC:2003(E) – 25 –
where
a is
...