SIST EN 62071-1:2007

Helical-scan compressed digital video cassette system using 6,35 mm magnetic tape - Format D-7 -- Part 1: VTR specifications

This part of IEC 62071 specifies the content, format and recording method of the data blocks containing video, audio, and associated data which form the helical records on 6,35 mm tape contained in cassettes as specified in SMPTE 307M. In addition, this standard specifies the content, format, and recording method for longitudinal cue and control tracks. One video channel and two independent audio channels are recorded in the digital format for 25 Mb/s VTRs and one video channel and four independent audio channels for 50 Mb/s VTRs. Each of these channels is designed to be capable of independent editing. The video channel records and reproduces a component television signal in the 525-line system with a frame frequency of 29,97 Hz (hereinafter referred to as the 525/60 system) and the 625-line system with a frame frequency of 25,00 Hz (hereinafter referred to as the 625/50 system). Prior to recording, the digital signal is be compressed to a DV-based 25 Mb/s bit stream with 4:1:1 sampling or a DV-based 50 Mb/s bit stream with 4:2:2 sampling. The standard includes the process required to decode the DV-based 25 Mb/s bit stream and 50 Mb/s bit stream into output video, audio, and data.

Videokassettensystem mit komprimierter digitaler Schrägspuraufzeichnung auf Magnetband 6,35 mm - Format D-7 -- Teil 1: VTR-Festlegungen

Système de magnétoscope numérique à cassette à balayage hélicoïdal à signal compressé utilisant une bande magnétique de 6,35 mm - Format D-7 -- Partie 1: Spécifications VTR

La CEI 62071-1:2005 spécifie le contenu, le format et la méthode d'enregistrement des blocs de données contenant des données vidéo, audio et des données associées formant les enregistrements hélicoïdaux sur les bandes de 6,35 mm contenues dans des cassettes, comme cela est spécifié dans le SMPTE 307M. Elle spécifie le contenu, le format et la méthode d'enregistrement des pistes longitudinales d'ordres et d'asservissement. La présente version bilingue (2012-11) correspond à la version anglaise monolingue publiée en 2005-10.

Digitalni videokasetni snemalni sistem z zapisovanjem s poševnimi sledmi na magnetnem traku, širokem 6,35 mm, in komprimiranjem – Format D-7 – 1. del: VTR-specifikacije (IEC 62071-1:2005)

General Information

• Status: Published
• Publication Date: 31-Dec-2006
• Withdrawal Date: 31-Dec-2006
• ICS: 33.160.40 - Video systems
• Technical Committee: AVM - Audio, video and multimedia systems and equipment
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2007
• Due Date: 01-Jan-2007
• Completion Date: 01-Jan-2007
• Ref Project: EN 62071-1:2006 - Helical-scan compressed digital video cassette system using 6,35 mm magnetic tape - Format D-7 - Part 1: VTR specifications

Relations

• Revised: SIST EN 62071:2005 - Helical-scan compressed digital video cassette recording system using 6,35 mm magnetic tape - Format D-7
• Effective Date: 13-May-2010

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2007
Digitalni videokasetni snemalni sistem z zapisovanjem s poševnimi sledmi na
magnetnem traku, širokem 6,35 mm, in komprimiranjem – Format D-7 – 1. del: VTR
-specifikacije (IEC 62071-1:2005)
Helical-scan compressed digital video cassette system using 6,35 mm magnetic tape -
Format D-7 -- Part 1: VTR specifications (IEC 62071-1:2005)
Videokassettensystem mit komprimierter digitaler Schrägspuraufzeichnung auf
Magnetband 6,35 mm - Format D-7 -- Teil 1: VTR-Festlegungen (IEC 62071-1:2005)
Systeme de magnétoscope numérique a cassette a balayage hélicoidal a signal
compressé utilisant une bande magnétique de 6,35 mm - Format D-7 -- Partie 1:
Spécifications VTR (IEC 62071-1:2005)
Ta slovenski standard je istoveten z: EN 62071-1:2006
ICS:
33.160.40 Video sistemi Video systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 62071-1
NORME EUROPÉENNE
July 2006
EUROPÄISCHE NORM
ICS 33.160.40
English version
Helical-scan compressed digital video cassette system
using 6,35 mm magnetic tape -
Format D-7
Part 1: VTR specifications
(IEC 62071-1:2005)
Système de magnétoscope numérique à Videokassettensystem mit komprimierter
cassette à balayage hélicoïdal à digitaler Schrägspuraufzeichnung auf
signal compressé utilisant une bande Magnetband 6,35 mm -
magnétique de 6,35 mm - Format D-7
Format D-7 Teil 1: VTR-Festlegungen
Partie 1: Spécifications VTR (IEC 62071-1:2005)
(CEI 62071-1:2005)
This European Standard was approved by CENELEC on 2006-06-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in two official versions (English and German). A version in any other language
made by translation under the responsibility of a CENELEC member into its own language and notified to the
Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62071-1:2006 E
Foreword
The text of the International Standard IEC 62071-1:2005, prepared by IEC TC 100, Audio, video and
multimedia systems and equipment, was submitted to the formal vote and was approved by CENELEC as
EN 62071-1 on 2006-06-01 without any modification.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-06-01
__________
Endorsement notice
The text of the International Standard IEC 62071-1:2005 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60735 NOTE  Harmonized as EN 60735:1991 (not modified).
IEC 61834-1 NOTE  Harmonized as EN 61834-1:1998 (not modified).
__________
- 3 - EN 62071-1:2006
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

AES3 2003 AES Recommended practice for digital audio - -
engineering - Serial transmisson format for
two-channel linearly represented digital audio
data
SMPTE 12M 1999 Television, audio and film - Time and control - -
code
SMPTE 259M 1997 Television - 10-Bit 4:2:2 Component and 4fsc - -
Composite Digital Signals - Serial Digital
Interface
INTERNATIONAL IEC
STANDARD 62071-1
First edition
2005-10
Helical-scan compressed digital video
cassette system using 6,35 mm
magnetic tape – Format D-7 –
Part 1:
VTR specifications
 IEC 2005  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 XD
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 62071-1  IEC:2005(E)
CONTENTS
FOREWORD.6

1 Scope.8
2 Normative references.8
3 Abbreviations and acronyms .8
4 Environment and test conditions .9
4.1 Environment .9
4.2 Reference tape.10
4.3 Calibration tapes .10
5 Tape.10
5.1 Base.10
5.2 Width .10
5.3 Width fluctuation.10
5.4 Reference edge straightness .10
5.5 Tape thickness .11
5.6 Transmissivity .11
5.7 Offset yield strength.11
5.8 Magnetic coating .11
5.9 Coating coercivity .11
6 Helical recordings .11
6.1 Tape speed .11
6.2 Sectors.11
6.3 Record locations and dimensions.11
6.4 Helical track record tolerance zones .12
6.5 Relative positions of recorded information.12
6.6 Gap azimuth .22
7 Programme track data .26
7.1 General .26
7.2 Insert and track information (ITI) sector .41
7.3 Audio sector .51
7.4 Video sector .56
7.5 Subcode sector.60
7.6 Edit gap.63
8 Audio processing .64
8.1 General .64
8.2 Encoding mode.64
8.3 Audio shuffling.65
8.4 Audio auxiliary data (AAUX).66
8.5 Error correction code addition .69
9 Video processing .71
9.1 General .71
9.2 Compressed macro block and data-sync block.71
9.3 Video auxiliary data (VAUX).72
9.4 Error correction code addition .76

62071-1  IEC:2005(E) – 3 –
10 Subcode processing .77
10.1 General .77
10.2 Subcode data .77
10.3 Error correction code addition .80
11 Longitudinal tracks.81
11.1 Control track.81
11.2 Cue track.82

Annex A (normative) Tape tension.83
Annex B (normative) Track pattern during insert editing.84
Annex C (normative) Cross-tape track measurement technique .86
Annex D (normative) Frequency characteristics of F track .89
Annex E (informative) Relationship between tape length and recording time .90
Annex F (informative) Block diagram of D-7 recorder.91

Bibliography .92

Figure 1 – Locations and dimensions of recorded tracks of 25 Mb/s format.13
Figure 2 – Locations and dimensions of recorded tracks of 50 Mb/s format.14
Figure 3 – Location of cue and control track record.15
Figure 4 – Locations and dimensions of tolerance zones of helical track record of
25 Mb/s format.20
Figure 5 – Locations and dimensions of tolerance zones of helical track record of
50 Mb/s format.21
Figure 6 – A possible scanner configuration and tape wrap of 25 Mb/s format.24
Figure 7 – A possible scanner configuration and tape wrap of 50 Mb/s format.25
Figure 8 – Possible recording system configuration with digital interface port
(informative) .27
Figure 9 – Sector arrangement on helical track.27
Figure 10 – Frames and tracks (525/60 system of 25 Mb/s format) .28
Figure 11 – Frames and tracks (625/50 system of 25 Mb/s format) .28
Figure 12 – A frame and tracks (525/60 system of 50 Mb/s format).29
Figure 13 – A frame and tracks (625/50 system of 50 Mb/s format).29
Figure 14 – Frequency characteristics of tracks .34
Figure 15 – Modulation for audio sector.36
Figure 16 – Modulation for video sector .37
Figure 17 – Modulation for subcode sector .38
Figure 18 – Possible block diagram for signal processing .39
Figure 19 – Bit stream before interleaved NRZI modulation.40
Figure 20 – Pre-coding.40
Figure 21 – Structure of ITI sector .42
Figure 22 – Structure of sync block of TIA .48
Figure 23 – Structure of audio sector.51
Figure 24 – Structure of sync blocks in audio sector .52
Figure 25 – Structure of video sector .57

– 4 – 62071-1  IEC:2005(E)
Figure 26 – Structure of sync blocks in video sector .58
Figure 27 – Structure of subcode sector .61
Figure 28 – Structure of sync blocks in subcode sector.62
Figure 29 – Sample to audio data bytes conversion .65
Figure 30 – Arrangement of AAUX packs in audio auxiliary data .66
Figure 31 – Data and inner parity of a data sync block .70
Figure 32 – Data and outer parity of a data sync block for audio sector .71
Figure 33 – Relation between the compressed macro block number and the data-sync block 72
Figure 34 – Arrangement.73
Figure 35 – Data and outer parity of a data sync block for video sector .77
Figure 36 – Arrangement of subcode data .78
Figure 37 – Bit assignment for subcode data and parity .81
Figure 38 – Recorded control code waveform timing (525/60 system) .82
Figure 39 – Recorded control code waveform timing (625/50 system) .82
Figure B.1 – Typical track pattern during insert editing for 25 Mb/s format.84
Figure B.2 – Typical track pattern during insert editing for 50 Mb/s format.85
Figure C.1 – Correction factors (actual tape speed, tension) .87
Figure C.2 – Track location error plot for 25 Mb/s format (example) .88
Figure C.3 – Track location error plot for 50 Mb/s format (example) .88
Figure C.4 – Cross-tape measurement technique .88
Figure D.1 – Frequency characteristics of F track .89
Figure F.1 – Block diagram of D-7 recorder .91

Table 1 – Record locations and dimensions (525/60 system of 25 Mb/s format) .16
Table 2 – Record locations and dimensions (625/50 system of 25 Mb/s format) .17
Table 3 – Record locations and dimensions (525/60 system of 50 Mb/s format) .18
Table 4 – Record locations and dimensions (625/50 system of 50 Mb/s format) .19
Table 5 – Parameters for a possible scanner design of 25 Mb/s format.23
Table 6 – Parameters for a possible scanner design of 50 Mb/s format.23
Table 7 – Frames and servo information (525/60 system of 25 Mb/s format) .30
Table 8 – Frames and servo information (625/50 system of 25 Mb/s format) .31
Table 9 – A frame and servo information (525/60 system of 50 Mb/s format).32
Table 10 – A frame and servo information (625/50 system of 50 Mb/s format).33
Table 11 – Bit stream of ITI preamble for servo information F .42
Table 12 – Bit stream of ITI preamble for servo information F .43
Table 13 – Bit stream of ITI preamble for servo information F .44
Table 14 – Bit stream of SSA for servo information F .45
Table 15 – Bit stream of SSA for servo information F .46
Table 16 – Bit stream of SSA for servo information F .47
Table 17 – Application ID of track information.48
Table 18 – Pilot frame .48
Table 19 – Bit stream of TIA for servo information F .49
Table 20 – Bit stream of TIA for servo information F .49
62071-1  IEC:2005(E) – 5 –
Table 21 – Bit stream of TIA for servo information F .49
Table 22 – Bit stream of ITI post-amble for servo information F .50
Table 23 – Bit stream of ITI post-amble for servo information F .50
Table 24 – Bit stream of ITI post-amble for servo information F .50
Table 25 – ID0 in audio sector.53
Table 26 – Audio application ID .53
Table 27 – Track pair number for 25 Mb/s format .53
Table 28 – Track pair number for 50 Mb/s format .54
Table 29 – Bit assignment of ID codewords .55
Table 30 – ID data in video sector .59
Table 31 – Video application ID .60
Table 32 – ID data in subcode sector .62
Table 33 – Subcode application ID .63
Table 34 – AAUX data.67
Table 35 – Mapping of AAUX source pack .67
Table 36 – Mapping of AAUX source control pack.68
Table 37 – VAUX data.74
Table 38 – Mapping of VAUX source pack .74
Table 39 – Mapping of VAUX source control pack.75
Table 40 – Mapping of subcode pack .78
Table 41 – Mapping of time code pack .79
Table 42 – Mapping of a binary group pack .80
Table C.1 – Nomenclature and calculation of track location error .87
Table E.1 – Tape length and recording time.90

– 6 – 62071-1  IEC:2005(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HELICAL-SCAN COMPRESSED DIGITAL VIDEO CASSETTE SYSTEM
USING 6,35 mm MAGNETIC TAPE – FORMAT D-7 –

Part 1: VTR specifications
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62071-1 has been prepared by technical area 6: Higher data rate
storage media, data structures and equipment of IEC technical committee 100: Audio, video
and multimedia systems and equipment.
The text of this standard is based on the following documents:
CDV Report on voting
100/900/CDV 100/984/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.

62071-1  IEC:2005(E) – 7 –
IEC 62071 consists of the following parts, under the general title Helical-scan compressed
digital video cassette system using 6,35 mm magnetic tape – Format D-7:
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 video compressed data.
Part 2 describes the specifications for encoding process and data format for 525i and 625i
systems.
Part 3 describes the specifications for transmission of DV-based compressed video and audio
data stream over 270 Mb/s and 360 Mb/s serial digital interface.
The committee has decided that the contents of this publication will remain unchanged until the
maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

– 8 – 62071-1  IEC:2005(E)
HELICAL-SCAN COMPRESSED DIGITAL VIDEO CASSETTE SYSTEM
USING 6,35 mm MAGNETIC TAPE – FORMAT D-7 –

Part 1: VTR specifications
1 Scope
This part of IEC 62071 specifies the content, format and recording method of the data blocks
containing video, audio, and associated data which form the helical records on 6,35 mm tape
contained in cassettes as specified in SMPTE 307M.
In addition, this standard specifies the content, format, and recording method for longitudinal
cue and control tracks.
One video channel and two independent audio channels are recorded in the digital format for
25 Mb/s VTRs and one video channel and four independent audio channels for 50 Mb/s VTRs.
Each of these channels is designed to be capable of independent editing.
The video channel records and reproduces a component television signal in the 525-line
system with a frame frequency of 29,97 Hz (hereinafter referred to as the 525/60 system) and
the 625-line system with a frame frequency of 25,00 Hz (hereinafter referred to as the 625/50
system).
Prior to recording, the digital signal is be compressed to a DV-based 25 Mb/s bit stream with
4:1:1 sampling or a DV-based 50 Mb/s bit stream with 4:2:2 sampling.
The standard includes the process required to decode the DV-based 25 Mb/s bit stream and
50 Mb/s bit stream into output video, audio, and data.
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.
AES3:2003, AES Recommended Practice for Digital Audio Engineering – Serial transmission
format for two-channel linearly represented digital audio data
SMPTE 12M: 1999, Television, Audio and Film – Time and Control Code
SMPTE 259M: 1997, Television – 10-Bit 4:2:2 Component and 4fsc NTSC Composite Digital
Signals – Serial Digital Interface
3 Abbreviations and acronyms
AAUX Audio auxiliary data
AP1 Audio application ID
AP2 Video application ID
AP3 Subcode application ID
APT Track application ID
62071-1  IEC:2005(E) – 9 –
Arb Arbitrary
AS AAUX source pack
ASC AAUX source control pack
B/W Black and white flag
CGMS Copy generation management system
DBN DIF block number
DCT Discrete cosine transform
DIF Digital interface
DSF DIF sequence flag
ECC Error correction code
EFC Emphasis channel flag
EOB End of block
ID Identification
IDP ID parity
ITI Insert and track information
LF Locked mode flag
PF Pilot frame
QNO Quantization number
QU Quantization
Res Reserved for future use
SMP Sampling frequency
SSA Start sync area
SSYB Subcode sync block number
STA Status of the compressed macro block
Syb Sync block number
TF Transmitting flag
TIA Track information area
Trp Track pair number
VAUX Video auxiliary data
VLC Variable length coding
VS VAUX source pack
VSC VAUX source control pack
VSM Vibrating sample magnetometer
4 Environment and test conditions
4.1 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: 0,09 N ± 0,02 N (see Annex A)

– 10 – 62071-1  IEC:2005(E)
4.2 Reference tape
A blank tape for reference recordings shall be available from the format holder or approved
source.
4.3 Calibration tapes
The calibration tapes meeting the requirements of 4.3.1, 4.3.2, and Clause 5 shall be made
available from manufacturers who produce digital television tape recorders and players in
accordance with this standard.
4.3.1 Record locations and dimensions
Calibration tape shall be manufactured to tolerances shown in Table 1 or Table 2 for 25 Mb/s
format or Table 3 or Table 4 for 50 Mb/s format but with these tolerances reduced by 50 %.
4.3.2 Calibration signals
Two sets of signals shall be recorded on the calibration tape:
a) – Video: 100 / 0 / 100 / 0 colour bars
– Audio: 1 kHz tone at 20 dB below full scale on each audio channel
– Cue: 1 kHz and 6 kHz tone at the analogue recording reference level;
b) A signal of constant recorded frequency (i.e. the Nyquist frequency) for the purpose of
mechanical alignment. The recording level shall conform to 7.1.4.3

5 Tape
5.1 Base
The base material shall be polyester or equivalent.
5.2 Width
The tape width shall be 6,350 mm ± 0,005 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 shall be within the aforementioned specification at any measuring position.
5.3 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 tape width fluctuation shall be
within the aforementioned specification at each of ten equally spaced points in the 900 mm
span.
5.4 Reference edge straightness
The reference edge straightness maximum deviation is 6 µm peak-to-peak. Edge straightness
fluctuation is measured at the edge of a moving tape guided by three guides having contact on
the same edge and having a distance of 85 mm from the first to second guide and 85 mm from
the second to third guide. Edge measurements are averaged over a 10 m length and are made
5 mm from the midpoint between the first and second guide towards the first guide.

62071-1  IEC:2005(E) – 11 –
5.5 Tape thickness
0 0
The total tape thickness shall be 8,8 µm and 6,7 µm.
−0,8 −0,4
NOTE Tape of either thickness may be used for 25 Mb/s or 50 Mb/s formats.
5.6 Transmissivity
Transmissivity shall be less than 5 %, measured over the range of wavelengths 800 nm to
1 000 nm.
5.7 Offset yield strength
The offset yield strength shall be greater than 3 N. The force to produce 0,2 % elongation of a
1 000 mm test sample with a pull rate of 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.
5.8 Magnetic coating
The magnetic layer of the tape shall consist of a coating of metal particles or equivalent.
5.9 Coating coercivity
The magnetic coating coercivity shall be a class 2300 (approximately 2300 Oe / 184000 A/m),
with an applied field of 10000 Oe / 800000 A/m measured by a VSM.
6 Helical recordings
6.1 Tape speed
The tape speed for the 25 Mb/s format shall be 33,8201 mm/s for the 525/60 system and
33,8539 mm/s for the 625/50 system. The tape speed for the 50 Mb/s format shall be
67,6401 mm/s for the 525/60 system and 67,7077 mm/s for the 625/50 system. The tolerance
shall be ±0,2 % respectively.
6.2 Sectors
Each recorded track contains an ITI sector, an audio sector, a video sector and a subcode
sector.
6.3 Record locations and dimensions
Record locations and dimensions for continuous recording of 25 Mb/s format shall be as
specified in Figures 1 and 3, and Table 1 (525/60 system) or in Figures 1 and 3, and Table 2
(625/50 system). In recording, sector locations on each helical track shall be contained within
the tolerance specified in Figure 1 and Table 1 (525/60 system) or in Figure 1 and Table
2(625/50 system).
Record location and dimensions for continuous recording of 50 Mb/s format shall be as
specified in Figures 2 and 3, and Table 3 (525/60 system) or in Figures 2 and 3, and Table 4
(625/50 system). In recording, sector locations on each helical track shall be contained within
the tolerance specified in Figure 2 and Table 3 (525/60 system) or in Figure 2 and Table 4
(625/50 system).
– 12 – 62071-1  IEC:2005(E)
The reference edge of the tape for dimensions specified in this standard shall be the lower
edge as shown in Figures 1 and 2. The magnetic coating, with the direction of tape travel as
shown in Figures 1 and 2, are on the side facing the observer.
As indicated in Figures 1 and 2, this standard anticipates a zero guard band between recorded
tracks, and the nominal record head width shall be equal to the track pitch of 18 µm. The
scanner head configuration should be chosen so that the recorded track widths are contained
within the limits of 16 µm to 20 µm.
The format requires flying erasure for recording. In insert editing, this standard provides a
guard band of 3 µm ± 1,5 µm between the previously recorded track and the inserted track at
editing points only. A typical track pattern for insert editing is shown in Figures B.1 and B.2 of
Annex B.
6.4 Helical track record tolerance zones
In the case of 25 Mb/s format, the centre of two consecutive tracks starting at the first track in
each video frame shall be contained within the pattern of the two tolerance zones established
in Figure 4. Each zone is defined by two parallel lines which are inclined at an angle of 9,178 4°
basic with respect to the tape reference edge. The centrelines of each zone shall be spaced
apart 18,0 µm basic. The width of zone 1 shall be 3 µm and the width of zone 2 shall be 5 µm.
These zones are established to contain track angle errors, track straightness errors, and
vertical head offset tolerances (the measuring technique is shown in Annex C).
In the case of 50 Mb/s format, the lower edge of four consecutive tracks starting at the first
track in each video frame shall be contained within the pattern of the four tolerance zones
established in Figure 5. Each zone is defined by two parallel lines which are inclined at an
angle of 9,1784° basic with respect to the tape reference edge. The centrelines of each zone
shall be spaced apart 18,0 µm basic. The width of zone 2 shall be 3 µm and the width of zone 1,
3 and 4 shall be 5 µm. These zones are established to contain track angle errors, track
straightness errors, and vertical head offset tolerance.
6.5 Relative positions of recorded information
6.5.1 Relative positions of longitudinal tracks
Audio, video, control track and cue track with information intended to be time coincident shall
be positioned as shown in Figures 1 to 3.
6.5.2 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 centreline of track
0 in each ITI sector (see Figures 1 to 3).
The end of the preamble and beginning of SSA in the ITI sector shall be recorded at the
programme area reference point, and the tolerance of dimension X . The locations are shown
in Figures 1 to 3; dimensions X and Y are specified in Tables 1 to 4. The relationship
0 0
between sectors and contents of each sector is specified in Clause 7.

X
M
M M M h
3 2 1
T
T
X X
1 0
X
X
L
62071-1  IEC:2005(E) – 13 –
Direction of tape travel Cue track
Direction of head motion
R
θ
Control track
Reference edge
α
Detail R
α
IEC  1858/05
NOTE 1 M is an ITI sector.
NOTE 2 M is an audio sector.
NOTE 3 M is a video sector.
NOTE 4 M is a subcode sector.
NOTE 5 Tracks viewed from magnetic coating side.
NOTE 6 Dimension X to X are determined by the programme reference point as defined in Figure 3.
1 3
Figure 1 – Locations and dimensions of recorded tracks of 25 Mb/s format
I
Y
A
B
E
F
G
W
X
M
M M M h
3 2 1
T
T
T
T
X X
1 0
X
X
L
– 14 – 62071-1  IEC:2005(E)
Cue track
Direction of tape travel
Direction of head motion
R
θ
Control track
Reference edge
α
Detail R
α
IEC  1859/05
NOTE 1 M is an ITI sector.
NOTE 2 M is an audio sector.
NOTE 3 M is a video sector.
NOTE 4 M is a subcode sector.
NOTE 5 Tracks viewed from magnetic coating side.
NOTE 6 Dimension X to X are determined by the programme reference point as defined in Figure 3.
1 3
Figure 2 – Locations and dimensions of recorded tracks of 50 Mb/s format

I
Y
A
B
E
F
G
W
XXX
XX
62071-1  IEC:2005(E) – 15 –
SeSeSerrrvvvooo
P2P2P2 referencreferencreferenceee
pulpulpulssseee
CueCueCue
P1P1P1
trtrtraaaccckkk
RecRecRecordiordiording cng cng curreurreurrentntnt
wawawavvveeefffooorrrmmm
DiDiDirecrecrectttiiion ofon ofon of
heaheahead md md motototiiiononon
BBB
NNNN SSSS SSSS NNNN
AAA
MMMagagagnetnetnetiiizzzatatatiiiooonnn
on ton ton the the the taaapepepe
ContContControlrolrol DiDiDirecrecrectttiiion ofon ofon of
trtrtraaaccckkk tttape tape tape trrravavaveeelll
DetailDetailDetail A A A
PPrrogramogrammmee
refreferencerence poie pointnt
ITIITI
sesectoctorr
BBBegiegieginninninninnng ofg ofg of
SSA inSSA inSSA in I I ITTTIII
CC
PPrre-ame-amblblee
PPPrrrogramogramogrammmmeee
refrefreferencerencerence poie poie pointntnt
RefRefereerencnce edgee edge
DetailDetailDetail C C C
CoContntrolrol t tracrackk
DetailDetail B B
IEC  1860/05
Figure 3 – Location of cue and control track record
YY ((BASBASICIC))
YYY
YYY
– 16 – 62071-1  IEC:2005(E)
Table 1 – Record locations and dimensions (525/60 system of 25 Mb/s format)
Dimensions in millimetres
Dimensions Nominal Tolerance
A Control track lower edge 0  Basic
B Control track upper edge 0,400  ± 0,050
E Programme area lower edge 0,56  Derived
Programme area width 5,24  Derived
F
Cue track lower edge 6,000  ± 0,050
G
Ref.
Helical track pitch 0,018
I
Derived
Total length of helical track 32,842
L
Derived
Length of ITI sector with preamble and post-amble 0,876
M
Derived
Length of audio sector with preamble and post-amble 2,810
M
Derived
Length of video sector with preamble and post-amble 27,548
M
Derived
Length of subcode sector with preamble and post-amble 0,906
M
± 0,030
Control track reference pulse to programme reference point (see Figure 3) 67,500
P
± 0,300
Cue signal, start of code word of cue to programme reference point 69,900
P
(see Figure 3)
± 0,005
Tape width 6,350
W
± 0,050
Location of beginning of SSA in ITI sector 0
X
± 0,050
Location of start of audio data sync blocks 0,809
X
± 0,050
Lo
...