IEC 62071-2:2005

INTERNATIONAL IEC
STANDARD 62071-2
First edition
2005-10
Helical-scan compressed digital video
cassette system using 6,35 mm
magnetic tape – Format D-7 –
Part 2:
Compression format
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.
Further information on IEC publications
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology. Information relating to
this publication, including its validity, is available in the IEC Catalogue of
publications (see below) in addition to new editions, amendments and corrigenda.
Information on the subjects under consideration and work in progress undertaken
by the technical committee which has prepared this publication, as well as the list
of publications issued, is also available from the following:
• IEC Web Site (www.iec.ch)
• Catalogue of IEC publications
The on-line catalogue on the IEC web site (www.iec.ch/searchpub) enables you to
search by a variety of criteria including text searches, technical committees
and date of publication. On-line information is also available on recently issued
publications, withdrawn and replaced publications, as well as corrigenda.
• IEC Just Published
This summary of recently issued publications (www.iec.ch/online_news/ justpub)
is also available by email. Please contact the Customer Service Centre (see
below) for further information.
• Customer Service Centre
If you have any questions regarding this publication or need further assistance,
please contact the Customer Service Centre:

Email: custserv@iec.ch
Tel: +41 22 919 02 11
Fax: +41 22 919 03 00
INTERNATIONAL IEC
STANDARD 62071-2
First edition
2005-10
Helical-scan compressed digital video
cassette system using 6,35 mm
magnetic tape – Format D-7 –
Part 2:
Compression format
 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: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale XB
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

– 2 – 62071-2  IEC:2005(E)
–
CONTENTS
FOREWORD.5

1 Scope.7
2 Normative references.7
3 Abbreviations and acronyms .7
4 Interface .8
4.1 Introduction .8
4.2 Data structure.9
4.3 Header section .12
4.4 Subcode section .15
4.5 VAUX section .20
4.6 Audio section.24
4.7 Video section.30
5 Video compression .32
5.1 Video structure .32
5.2 DCT processing.48
5.3 Quantization .51
5.4 Variable length coding (VLC) .53
5.5 The arrangement of a compressed macro block .56
5.6 The arrangement of a video segment .59

Annex A (informative) Differences between IEC 61834 and IEC 62071-2.64
Annex B (normative) Digital filter for sampling-rate conversion from 4:2:2 to 4:1:1
colour difference signals .65
Annex C (informative) Block diagram of D-7 recorder .66

Bibliography .67

Figure 1 – Block diagram on the digital interface.8
Figure 2 – Data structure of one video frame for 50 Mb/s structure .10
Figure 3 – Data structure of one video frame for 25 Mb/s structure .10
Figure 4 – Data structure of a DIF sequence.11
Figure 5 – Data in the subcode section.16
Figure 6 – Pack in SSYB .17
Figure 7 – Data in the VAUX section.21
Figure 8 – Data in the audio section .24
Figure 9 – conversion of audio sample to audio data bytes .26
Figure 10 – Arrangement of AAUX packs in audio auxiliary data .26
Figure 11 – Transmitting samples of 525/60 system for 4:2:2 compression .34
Figure 12 – Transmitting samples of 625/50 system for 4:2:2 compression .35
Figure 13 – Transmitting samples of 525/60 system for 4:1:1 compression .36
Figure 14 – Transmitting samples of 625/50 system for 4:1:1 compression .37
Figure 15 – DCT block and the pixel coordinates .38

62071-2  IEC:2005(E) – 3 –
Figure 16 – The rightmost DCT block in colour difference signal for 4:1:1 compression
mode .38
Figure 17 – DCT block arrangement for 4:2:2 compression.39
Figure 18 – DCT block arrangement for 4:1:1 compression.40
Figure 19 – Macro block and DCT blocks for 4:2:2 compression .40
Figure 20 – Macro block and DCT blocks for 4:1:1 compression .40
Figure 21 – Super blocks and macro blocks in one TV frame for 525/60 system for
4:2:2 compression.42
Figure 22 – Super blocks and macro blocks in one TV frame for 525/60 system for
4:1:1 compression.43
Figure 23 – Super blocks and macro blocks in one TV frame for 625/50 system for

4:2:2 compression.44
Figure 24 – Super blocks and macro blocks in one TV frame for 625/50 system for
4:1:1 compression.45
Figure 25 – Macro block order in a super block for 4:2:2 compression .47
Figure 26 – Macro block order in a super block for 4:1:1 compression .47
Figure 27 – The output order of a weighted DCT block .50
Figure 28 – Area numbers .52
Figure 29 – Arrangement of a compressed macro block for 4:2:2 compression .56
Figure 30 – The arrangement of a compressed macro block for 4:1:1 compression.57
Figure 31 – The arrangement of a video segment after the bit rate reduction for 4:2:2
compression .62
Figure 32 – The arrangement of a video segment after the bit rate reduction for 4:1:1
compression .63
Figure 33 – The video error code.63
Figure B.1 – Template for insertion loss frequency characteristics .65
Figure B.2 – Passband ripple tolerance .65
Figure C.1 – Block diagram of D-7 recorder.66

Table 1 – ID data of a DIF block .12
Table 2 – Section type.13
Table 3 – DIF sequence number (525/60 system) .13
Table 4 – DIF sequence number (625/50 system) .14
Table 5 – DIF block number .14
Table 6 – Data (payload) in the Header DIF block.15
Table 7 – SSYB ID .17
Table 8 – Pack header table.18
Table 9 – Mapping of packet in SSYB data .18
Table 10 – Mapping of time code pack .19
Table 11 – Mapping of binary group pack .20
Table 12 – Mapping of VAUX pack in a DIF sequence .21
Table 13 – Mapping of VAUX source pack .21
Table 14 – Mapping of VAUX source control pack.23
Table 15 – Maping of AAUX pack in a DIF sequence .26
Table 16 – Mapping of AAUX Source pack .27

– 4 – 62071-2  IEC:2005(E)
–
Table 17 – Mapping of AAUX Source Control pack .28
Table 18 – Video DIF blocks and compressed macro blocks for 50 Mb/s structure –
4:2:2 compression.31
Table 19 – Video DIF blocks and compressed macro block for 25 Mb/s structure – 4:1:1

compression .32
Table 20 – Construction of video signal sampling (4:2:2) .33
Table 21 – Class number and the DCT block .51
Table 22 – An example of the Classification for reference.51
Table 23 – Quantization step.53
Table 24 – Length of codewords.54
Table 25 – Codewords for variable length coding.55
Table 26 – Definition of STA.57
Table 27 – Codewords of the QNO .58
Table A.1 – Abstract of differences between IEC 61834 and IEC 62071-2.64

62071-2  IEC:2005(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HELICAL-SCAN COMPRESSED DIGITAL VIDEO CASSETTE SYSTEM
USING 6,35 mm MAGNETIC TAPE – FORMAT D-7 –

Part 2: Compression format
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
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). 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. 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 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 IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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 62071-2 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
100/901/CDV 100/985/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.

– 6 – 62071-2  IEC:2005(E)
–
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 2 describes the specifications for encoding process and data format for 525i and 625i
systems.
Part 1 describes the VTR specifications which are tape, magnetization, helical recording,
modulation method and basic system data for video compressed data.
Part 3 describes the specifications for transmission of DV-based compressed video and audio
data stream over 270Mb/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.

62071-2  IEC:2005(E) – 7 –
HELICAL-SCAN COMPRESSED DIGITAL VIDEO CASSETTE SYSTEM
USING 6,35 mm MAGNETIC TAPE – FORMAT D-7 –

Part 2:Compression format
1 Scope
This part of IEC 62071 defines the DV-based data structure for the interface of digital audio,
subcode data and compressed video with the following parameters:
525/60 system – 4:1:1 image sampling structure, 25 Mb/s data rate;
525/60 system – 4:2:2 image sampling structure, 50 Mb/s data rate;
625/50 system – 4:1:1 image sampling structure, 25 Mb/s data rate;
625/50 system – 4:2:2 image sampling structure, 50 Mb/s data rate.
This standard does not define the DV compliant data structure for interface, of digital audio,
subcode data and compressed video with the following parameters:
625/50 system – 4:2:0 image sampling structure, 25 Mb/s data rate
The compression algorithm and the DIF structure conform to the DV data structure as defined
in IEC 61834. Differences between the DV-based data structure defined in this standard and
IEC 61834 are shown in Annex A.
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.
ITU-R BT.601-5: 1995, Studio encoding parameters of digital television for standard 4:3 and
wide-screen 16:9 aspect ratios
AES3-2003: Serial transmission format for two-channel linearly represented digital audio data
SMPTE 12M: 1999, Television, Audio and Film – Time and Control Code
3 Abbreviations and acronyms
AAUX Audio auxiliary data
AP1 Audio application ID
AP2 Video application ID
AP3 Subcode application ID
APT Track application ID
Arb  Arbitrary
AS AAUX source pack
ASC AAUX source control pack
B/W Black and white flag
CGMS Copy generation management system

– 8 – 62071-2  IEC:2005(E)
–
CM Compressed macro block
DBN DIF block number
DCT Discrete cosine transform
DIF Digital interface
DRF Direction flag
Dseq DIF sequence number
DSF DIF sequence flag
DV Identification of a compression family
EFC Emphasis audio channel flag
EOB End of block
FR Identification for the first half or the second half of each channel
FSC Identification of a DIF block in each channel
LF Locked mode flag
QNO Quantization number
QU Quantization
Res  Reserved for future use
SCT Section type
SMP Sampling frequency
SSYB Subcode sync block
STA  Status of the compressed macro block
STYPE (see Note) Signal type
Syb  Subcode sync block number
TF Transmitting flag
VAUX  Video auxiliary data
VLC  Variable length coding
VS  VAUX source pack
VSC  VAUX source control pack
NOTE STYPE as used in this standard is different from that in ANSI/IEEE 1394.
4 Interface
4.1 General
As shown in Figure 1, processed audio, video and subcode data, are output for different
applications through a digital interface port.

Audio, video and Digital
Audio in
Video in
Digital interface
subcode interface
Subcode in
processing formatting
IEC  1905/05
Figure 1 – Block diagram on the digital interface

62071-2  IEC:2005(E) – 9 –
4.2 Data structure
The data structure of the compressed stream at the digital interface is shown in Figures 2 and
3. Figure 2 shows the data structure for a 50 Mb/s structure, and Figure 3 shows the data
structure for a 25 Mb/s structure.
In the 50 Mb/s structure, the data of one video frame are divided into two channels. Each
channel is divided into 10 DIF sequences for the 525/60 system and 12 DIF sequences for the
625/50 system.
In the 25 Mb/s structure, the data of one video frame are divided into 10 DIF sequences for the
525/60 system and 12 DIF sequences for the 625/50 system.
Each DIF sequence consists of a header section, subcode section, VAUX section, audio
section and video section with the following DIF blocks respectively:
Header section : 1 DIF block,
Subcode section : 2 DIF blocks,
VAUX section : 3 DIF blocks,
Audio section : 9 DIF blocks,
Video section :135 DIF blocks.

As shown in Figures 2 and 3, each DIF block consists of a 3-byte ID and 77 bytes of data. DIF
data bytes are numbered 0 to 79.
Figure 4 shows the data structure of a DIF sequence for a 50 Mb/s or 25 Mb/s structure.

– 10 – 62071-2  IEC:2005(E)
–
DDDaaata ita ita innn one vi one vi one video framdeo framdeo frameee
FFFiiirst channelrst channelrst channel  SSSeeecond channelcond channelcond channel
DDDIIIFFF sequences sequences sequences
DDDIIIFFF sequence 0,0 sequence 0,0 sequence 0,0  DDDIIIFFF sequence 1,0 sequence 1,0 sequence 1,0  DIF sequence n-1,0 DDDIIIFFF sequence 0,1 sequence 0,1 sequence 0,1 DDDIIIFFF sequence 1,1 sequence 1,1 sequence 1,1 DIF sequence n-1,1
DDDIIIFFF sequence num sequence num sequence number    Fber    Fber    FSSSCCC
SSStttructure of a Dructure of a Dructure of a DIIIFFF
HHHeader sectieader sectieader sectiononon  SSSuuubcode sectibcode sectibcode sectiooonnn VAUX sVAUX sVAUX seeeccctttiiiooonnn AAAudiudiudio &o &o & vi vi video sectideo sectideo sectiooonnn
sequencesequencesequence
DDDIFIFIF bl bl blocksocksocks
H0H0H0,0,0,0 SC0SC0SC0,,,000  SC1SC1SC1,,,000  VA0VA0VA0,,,000 VA1VA1VA1,,,000 VA2VA2VA2,,,000 A0A0A0,,,000 V 0V 0V 0,,,000 VVV11132,032,032,0 VVV133,0133,0133,0  V1V1V1333444,,,000
DIFDIFDIF bl bl block numock numock numbbber    Fer    Fer    FSSSCCC
BBByyyte posite posite posititition numon numon numberberber
0  1  2  3 0  1  2  3 0  1  2  3 ---  --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- 797979
SSStttructure of a Dructure of a Dructure of a DIIIFFF bl bl blockockock  IDIDID  DaDaDatatata
WWherehere
n = 10 forn = 10 for 525/60 system 525/60 system
n = 12 forn = 12 for 625/50 system 625/50 system
FFSSCC:: F Fiirst/second channelrst/second channel

IEC  1906/05
Figure 2 – Data structure of one video frame for 50 Mb/s structure

Data in one video frame
DIF sequences
DIF sequence 0,0 DIF sequence 1,0 DIF sequence n-1,0
DIF sequence number   FSC
Structure of a DIF
Header section Subcode section VAUX section Audio & video section
sequence
H0,0 SC0,0 SC1,0 VA0,0 VA1,0 VA2,0 A0,0 V 0,0 VV132,0132,0 V133,0 V134,0
DIF blocks
DIF block number    FSC
Byte position number
0  1  2  3 - - - - - - - - - - - - - - - - - - - - - - - 79
Structure of a DIF block ID
Data
Where
n = 10 for 525/60 system
n = 12 for 625/50 system
FSC: First/second channel
IEC  1907/05
Figure 3 – Data structure of one video frame for 25 Mb/s structure

62071-2  IEC:2005(E) – 11 –
DIF blocks H0,i SC0,i SC1,i VA0,i VA1,i VA2,i

A0,i V0,i V1,i V2,i V3,i V4,i V5,i V6,i V7,i V8,i V9,i V10,i V11,i V12,i V13,i V14,i
A1,i V15,i V16,i V17,i V18,i V19,i V20,i V21,i V22,i V23,i V24,i V25,i V26,i V27,i V28,i V29,i
A2,i V30,i V31,i V32,i V33,i V34,i V35,i V36,i V37,i V38,i V39,i V40,i V41,i V42,i V43,i V44,i
A3,i V45,i V46,i V47,i V48,i V49,i V50,i V51,i V52,i V53,i V54,i V55,i V56,i V57,i V58,i V59,i
A4,i V60,i V61,i V62,i V63,i V64,i V65,i V66,i V67,i V68,i V69,i V70,i V71,i V72,i V73,i V74,i
A5,i V75,i V76,i V77,i V78,i V79,i V80,i V81,i V82,i V83,i V84,i V85,i V86,i V87,i V88,i V89,i
A6,i V90,i V91,i V92,i V93,i V94,i V95,i V96,i V97,i V98,i V99,i V100,i V101,i V102,i V103,i V104,i
A7,i V105,i V106,i V107,i V108,i V109,i V110,i V111,i V112,i V113,i V114,i V115,i V116,i V117,i V118,i V119,i
V134,i
A8,i V120,i V121,i V122,i V123,i V124,i V125,i V126,i V127,i V128,i V129,i V130,i V131,i V132,i V133,i
DIF block number
IEC  1908/05
where
i : FSC
i = 0   for 25 Mb/s structure
i = 0,1 for 50 Mb/s structure
H0,i : DIF block in header section
SC0,i to SC1,i : DIF blocks in subcode section
VA0,i to VA2,i : DIF blocks in VAUX section
A0,i  to A8,i : DIF blocks in audio section
V0,i  to V134,i : DIF blocks in video section

Figure 4 – Data structure of a DIF sequence

– 12 – 62071-2  IEC:2005(E)
–
4.3 Header section
4.3.1 ID
The ID part of each DIF block in the header section, shown in Figures 2 and 3, consists of
3 bytes (ID0, ID1, ID2). Table 1 shows the ID content of a DIF block.
Table 1 – ID data of a DIF block

Byte position number
Byte 0 Byte 1 Byte 2
(ID0) (ID1) (ID2)
MSB SCT Dseq DBN
2 3 7
SCT Dseq DBN
1 2 6
SCT Dseq DBN
0 1 5
Res Dseq DBN
0 4
Arb FSC DBN
Arb Res DBN
Arb Res DBN
LSB Arb Res DBN
The ID contains the following:
SCT: Section type (see Table 2)
Dseq: DIF sequence number (see Tables 3 and 4)
FSC: Identification of a DIF block in each channel
50 Mb/s structure
FSC = 0: first channel
FSC = 1: second channel
25 Mb/s structure
FSC = 0
DBN: DIF block number (see Table 5)
Arb: Arbitrary bit
Res: Reserved bit for future use
Default value shall be set to 1.

62071-2  IEC:2005(E) – 13 –
Table 2 – Section type
Section type bit
Section type
SCT SCT SCT
2 1 0
0 0 0 Header
0 0 1 Subcode
0 1 0 VAUX
0 1 1 Audio
1 0 0 Video
1 0 1
1 1 0 Reserved
1 1 1
Table 3 – DIF sequence number (525/60 system)
DIF sequence number bit Meaning
Dseq Dseq Dseq Dseq
3 2 1 0
0 0 0 0 DIF sequence number 0
0 0 0 1 DIF sequence number 1
0 0 1 0 DIF sequence number 2
0 0 1 1 DIF sequence number 3
0 1 0 0 DIF sequence number 4
0 1 0 1 DIF sequence number 5
0 1 1 0 DIF sequence number 6
0 1 1 1 DIF sequence number 7
1 0 0 0 DIF sequence number 8
1 0 0 1 DIF sequence number 9
1 0 1 0 Not used
1 0 1 1 Not used
1 1 0 0 Not used
1 1 0 1 Not used
1 1 1 0 Not used
1 1 1 1 Not used
– 14 – 62071-2  IEC:2005(E)
–
Table 4 – DIF sequence number (625/50 system)
DIF sequence number bit
Meaning
Dseq Dseq Dseq Dseq
3 2 1 0
0 0 0 0 DIF sequence number 0
0 0 0 1 DIF sequence number 1
0 0 1 0 DIF sequence number 2
0 0 1 1 DIF sequence number 3
0 1 0 0 DIF sequence number 4
0 1 0 1 DIF sequence number 5
0 1 1 0 DIF sequence number 6
0 1 1 1 DIF sequence number 7
1 0 0 0 DIF sequence number 8
1 0 0 1 DIF sequence number 9
1 0 1 0 DIF sequence number 10
1 0 1 1 DIF sequence number 11
1 1 0 0 Not used
1 1 0 1 Not used
1 1 1 0 Not used
1 1 1 1 Not used
Table 5 – DIF block number
DIF block number bit
Meaning
DBN DBN DBN DBN DBN DBN DBN DBN
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0 DIF block number 0
0 0 0 0 0 0 0 1 DIF block number 1
0 0 0 0 0 0 1 0 DIF block number 2
0 0 0 0 0 0 1 1 DIF block number 3
: : : : : : : : :
: : : : : : : : :
: : : : : : : : :
1 0 0 0 0 1 1 0 DIF block number 134
1 0 0 0 0 1 1 1 Not used
: : : : : : : : :
1 1 1 1 1 1 1 1 Not used
4.3.2 Data
The data part (payload) of each DIF block in the header section is shown in Table 6, bytes 3 to
7 are active and bytes 8 to 79 are reserved.

62071-2  IEC:2005(E) – 15 –
Table 6 – Data (payload) in the Header DIF block

Byte position number of Header DIF block
3 4 5 6 7 8 ------- 79
MSB DSF Res TF1 TF2 TF3 Res ------- Res
0 Res Res Res Res Res ------- Res
Res Res Res Res Res Res ------- Res
Res Res Res Res Res Res ------- Res
Res Res Res Res Res Res ------- Res
Res APT2 AP12 AP22 AP32 Res ------- Res
Res APT1 AP11 AP21 AP31 Res ------- Res
LSB Res APT0 AP10 AP20 AP30 Res ------- Res

DSF: DIF sequence flag
DSF = 0: 10 DIF sequences included in a channel (525/60 system)
DSF = 1: 12 DIF sequences included in a channel (625/50 system)
APTn, AP1n, AP2n, AP3n: These data shall be identical as track application IDs
(APTn = 001, AP1n = 001, AP2n = 001, AP3n = 001), if the source signal comes
from a digital VCR. If the signal source is unknown, all bits for these data shall
be set to 1.
TF: Transmitting flag
TF1: Transmitting flag of audio DIF blocks
TF2: Transmitting flag of VAUX and video DIF blocks
TF3: Transmitting flag of subcode DIF blocks

TFn = 0: Data shall be valid.
TFn = 1: Data shall be invalid.

Res: Reserved bit for future use
Default value shall be set to 1.

4.4 Subcode section
4.4.1 ID
The ID part of each DIF block in the subcode section is described in 4.3.1. The section type
shall be 001.
4.4.2 Data
The data part (payload) of each DIF block in the subcode section is shown in Figure 5. The
subcode data consists of 6 SSYBs, each 48 bytes long, and a reserved area of 29 bytes in
each DIF block. SSYBs in a DIF sequence are numbered 0 to 11. Each SSYB is composed of
SSYB ID equal to 2 bytes, FFh, and an SSYB data payload of 5 bytes.

– 16 – 62071-2  IEC:2005(E)
–
Byte position number
0  1  2  3 50 51 79
29 bytes
SC0,0
Reserved
ID
SC0,1
Data
3 10 11 18 19 26 27 34 35 42 43
SSYB0 SSYB2 SSYB5
SSYB1 SSYB3 SSYB4
Byte position number
50 51
0  1  2  3 79
29 bytes
SC1,0
ID Reserved
SC1,1
Data
10 11 18 19 26 27 34 35 42 43
3 50
SSYB8 SSYB10 SSYB11
SSYB6 SSYB7 SSYB9
SSYB
SSYB
FFh SSYB data
ID0 ID1
8 bytes
IEC  1909/05
Figure 5 – Data in the subcode section
4.4.2.1 SSYB ID
Table 7 shows SSYB ID (ID0, ID1). These data contain FR ID, application ID (AP32, AP31,
AP30), and SSYB number (Syb3, Syb2, Syb1, Syb0).
FR ID is an identification for the first or second half of each channel:
FR = 1: the first half of each channel
FR = 0: the second half of each channel

The first half of each channel
DIF sequence number 0, 1, 2, 3, 4 for 525/60 system
DIF sequence number 0, 1, 2, 3, 4, 5 for 625/50 system

The second half of each channel
DIF sequence number 5, 6, 7, 8, 9 for 525/60 system
DIF sequence number 6, 7, 8, 9, 10, 11 for 625/50 system

If information is not available, all bits shall be set to 1.

62071-2  IEC:2005(E) – 17 –
Table 7 – SSYB ID
SSYB number SSYB number SSYB number
Bit position 0 and 6 1 to 5 and 7 to 10 11
ID0 ID1 ID0 ID1 ID0 ID1
b7 (MSB) FR Arb FR Arb FR Arb
b6 AP3 Arb Res Arb APT Arb
2 2
b5 AP3 Arb Res Arb APT Arb
1 1
b4 AP3 Arb Res Arb APT Arb
0 0
b3 Arb Syb Arb Syb Arb Syb
3 3 3
b2 Arb Syb Arb Syb Arb Syb
2 2 2
b1 Arb Syb Arb Syb Arb Syb
1 1 1
b0 (LSB) Arb Syb Arb Syb Arb Syb
0 0 0
NOTE Arb: Arbitrary bit
4.4.2.2 SSYB data
Each SSYB data payload consists of a pack of 5 bytes as shown in Figure 6. Table 8 shows
pack header table (PC0 byte organization). Table 9 shows the pack arrangement in SSYB data
for each channel.
SSYB SSYB
FFh SSYB data
ID0 ID1
5 bytes
Pack
PC0   PC1   PC2   PC3   PC4

IEC  1910/05
Figure 6 – Pack in SSYB
– 18 – 62071-2  IEC:2005(E)
–
Table 8 – Pack header table
UPPER
0000 0001 0010 0011 0100 0101 0110 0111 ----- 1111
LOWER
AUDIO VIDEO
SOURCE SOURCE
AUDIO VIDEO
SOURCE SOURCE
CONTROL CONTROL
TIME
CODE
BINARY
GROUP
|
NO INFO
Table 9 – Mapping of packet in SSYB data
The first half The second half
SSYB number
of each channel of each channel
0 Reserved Reserved
1 Reserved Reserved
2 Reserved Reserved
3 TC TC
4 BG Reserved
5 TC Reserved
6 Reserved Reserved
7 Reserved Reserved
8 Reserved Reserved
9 TC TC
10 BG Reserved
11 TC Reserved
NOTE 1 TC: Time code pack.
NOTE 2 BG: Binary group pack.
NOTE 3 Reserved = default value of all bits is set to 1.
NOTE 4 TC and BG data are the same within a single video frame. The time
code data is an LCT type.
62071-2  IEC:2005(E) – 19 –
4.4.2.2.1 Time code pack (TC)
Table 10 shows a mapping of the time code pack. Time code data mapped to the time code
packs remain the same within each video frame.

Table 10 – Mapping of time code pack
525/60 system
MSB    LSB
PC0 0 0 0 1 0 0 1 1
TENS of
CF DF UNITS of FRAMES
PC1
FRAMES
TENS of
PC2 PC UNITS of SECONDS
SECONDS
TENS of
PC3 BGF0 UNITS of MINUTES
MINUTES
TENS of
PC4 BGF2 BGF1 UNITS of HOURS
HOURS
625/50 system
MSB    LSB
PC0 0 0 0 1 0 0 1 1
TENS of
CF Arb UNITS of FRAMES
PC1
FRAMES
TENS of
PC2 BGF0 UNITS of SECONDS
SECONDS
TENS of
PC3 BGF2 UNITS of MINUTES
MINUTES
TENS of
PC4 PC BGF1 UNITS of HOURS
HOURS
NOTE Detailed information is given in ANSI/SMPTE 12M.
CF: Colour frame
0 = unsynchronized mode
1 = synchronized mode
DF: Drop frame flag
0 = Non-drop frame time code
1 = Drop frame time code
PC: Biphase mark polarity correction
0 = even
1 = odd
BGF: Binary group flag
Arb: Arbitrary bit
– 20 – 62071-2  IEC:2005(E)
–
4.4.2.2.2 Binary group pack (BG)
Table 11 shows the mapping of the binary group pack. Binary group data mapped to the binary
group packs remain the same within each video frame.
Table 11 – Mapping of binary group pack
MSB    LSB
PC0 0 0 0 1 0 1 0 0
PC1 BINARY GROUP2 BINARY GROUP1
BINARY GROUP4 BINARY GROUP3
PC2
PC3 BINARY GROUP6 BINARY GROUP5
PC4 BINARY GROUP8 BINARY GROUP7

4.5 VAUX section
4.5.1 ID
The ID part of each DIF block in the VAUX section is described in 4.3.1. The section type shall
be 010.
4.5.2 Data
The data part (payload) of each DIF block in the VAUX section is shown in Figure 7. This
figure shows the VAUX pack arrangement for each DIF sequence.
There are 15 packs, each 5 bytes long, and two reserved bytes in each VAUX DIF block
payload. A default value for the reserved byte is set to FFh.
Therefore, there are 45 packs in a DIF sequence. VAUX packs of the DIF blocks are
sequentially numbered 0 to 44. This number is called a video pack number.
Table 12 shows the mapping of the VAUX packs of the VAUX DIF blocks. A VAUX source pack
(VS) and a VAUX source control pack (VSC) must be present in each of the video compressed
frames. The remaining VAUX packs of the DIF blocks in a DIF sequence are reserved and the
value of all reserved words is set to FFh.
If VAUX data are not transmitted, a NO INFO pack, which is filled up by FFh shall be
transmitted.
62071-2  IEC:2005(E) – 21 –
Byte position number
0 1 2 3   8   13  18   23  28   33  38   43  48   53  58  63   68  73  78 79
VA0,0
ID 0 123 45 678 9 10 11 12 13 14
VA0,1
VA1,0
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
ID
VA1,1
VA2,0
ID 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
VA2,1
Pack number Pack
Pack
header data
PC0 PC1 PC2 PC3
PC4
IEC  1911/05
Figure 7 – Data in the VAUX section
Table 12 – Mapping of VAUX pack in a DIF sequence
Pack Number
Even DIF sequence Odd DIF sequence Pack data
39 0 VS
40 1
VSC
Even DIF sequence:
DIF sequence number 0, 2, 4, 6, 8      for 525/60 system
DIF sequence number 0, 2, 4, 6, 8, 10   for 625/50 system

Odd DIF sequence:
DIF sequence number 1, 3, 5, 7, 9      for 525/60 system
DIF sequence number 1, 3, 5, 7, 9, 11   for 625/50 system

4.5.2.1 VAUX source pack (VS)
Table 13 shows the mapping of a VAUX source pack.
Table 13 – Mapping of VAUX source pack
MSB    LSB
PC0 0 1 1 0 0 0 0 0
PC1 Res Res Res Res Res Res Res Res
B/W EN CLF Res Res Res Res
PC2
PC3 Res Res 50/60 STYPE
PC4 VISC
– 22 – 62071-2  IEC:2005(E)
–
B/W: Black and white flag
0 = Black and white
1 = Colour
EN : Colour frames enable flag
0 = CLF is valid.
1 = CLF is invalid.
CLF: Colour frames identification code (see ITU-R–BT.470-7)
For 525/60 system
00b = Colour frame A
01b = Colour frame B
Others = Reserved
For 625/50 system
00b = 1st , 2nd field
01b = 3rd , 4th field
10b = 5th , 6th field
11b = 7th , 8th field
50/60:
0 = 60 field system
1 = 50 field system
STYPE: STYPE defines a signal type of video signal.
00000b = 4:1:1 compression
00001b = Reserved
|        |
00011b = Reserved
00100b = 4:2:2 compression
00101b = Reserved
|        |
11111b = Reserved
VISC:
10001000b = –180
|         |
00000000b = 0
|         |
01111000b = 180
01111111b = No information
Other = Reserved
Res : Reserved bit for future use
Default value shall be set to 1.

4.5.2.2 VAUX source control pack (VSC)
Table 14 shows the mapping of the VAUX source control pack.

62071-2  IEC:2005(E) – 23 –
Table 14 – Mapping of VAUX source control pack
MSB    LSB
PC0 0 1 1 0 0 0 0 1
PC1 CGMS Res Res Res Res Res Res
Res Res 0 0 Res DISP
PC2
PC3 FF FS FC IL Res Res 0 0
PC4 Res Res Res Res Res Res Res Res

CGMS: Copy generation management system

0 0 b = Copy free
Others = Reserved
DISP: Display select mode
DISP Aspect ratio and format Position
0 0 0 4 : 3 full format Not applicable
0 0 1 Reserved
0 1 0 16 : 9 full format (squeeze) Not applicable
0 1 1
| Reserved
1 1 1
FF: Frame/field flag
FF indicates whether two consecutive fields are delivered, or one field is
repeated twice during one frame period.

0 = Only one of two fields is delivered twice
1 = Both fields are delivered in order

FS: First/second field flag
FS indicates a field which is delivered during the field one period.

0 = Field 2 is delivered.
1 = Field 1 is delivered.
FF FS Output field
1 1 Field 1 and field 2 are output in this order (1,2 sequence).
1 0 Field 2 and field 1 are output in this order (2,1 sequence).
0 1 Field 1 is output twice.
0 0 Field 2 is output twice.
FC: Frame change flag
FC indicates whether the picture of the current frame is repeated based on the
immediate previous frame.
0 = Same picture as the previous frame
1 = Different picture from the previous frame

– 24 – 62071-2  IEC:2005(E)
–
IL: Interlace flag
0 = Noninterlaced
1 = Interlaced
Res : Reserved bit for future use
Default value shall be set to 1.

4.6 Audio section
4.6.1 ID
The ID part of each DIF block in the audio section is described in 4.3.1. The section type shall
be 011.
4.6.2 Data
The data part (payload) of each DIF block in the audio section is shown in Figure 8. The data
of a DIF block in the audio DIF block are composed of 5 bytes of audio auxiliary data (AAUX)
and 72 bytes of audio data which are encoded and shuffled by the process shown in Figure 8.
Byte position number
0   1   2  3                   7  8                                  79
Audio auxiliary data
ID
Audio data
IEC  1912/05
Figure 8 – Data in the audio section
4.6.2.1 Audio encoding
4.6.2.1.1 Source coding
Each audio input signal is sampled at 48kHz, with 16-bit quantization. The system provides two
channels of audio for 25 Mb/s structure or four channels of audio for 50 Mb/s structure. Audio
data for each audio channel are located in an audio block respectively.
An audio block consists of 45 DIF blocks (9 DIF blocks x 5 DIF sequences) for the 525/60
system and 54 DIF blocks (9 DIF blocks x 6 DIF sequences) for the 625/50 system.
4.6.2.1.2 Emphasis
Audio encoding is carried out with the first order pre-emphasis of 50/15µs. For analogue input
recording, emphasis shall be off in the default state.
4.6.2.1.3 Audio error code
In the encoded audio data, 8000h shall be assigned as an audio error code to indicate an
invalid audio sample. This code corresponds to negative full-scale value in ordinary twos
complement representation. When the encoded data includes 8000h, it shall be converted to
8001h.
4.6.2.1.4 Relative audio-video timing
The audio frame duration equals a video frame period. An audio frame begins with an audio
sample acquired within the duration of minus 50 samples relative to zero samples from the first
pre-equalizing pulse of the vertical blanking period of the input video signal. The first pre-
equalizing pulse means the start of line number 1 for the 525/60 system, and the middle of line
number 623 for the 625/50 system.

62071-2  IEC:2005(E) – 25 –
4.6.2.1.5 Audio frame processing
This standard provides audio frame processing in the locked mode.
The sampling frequency of the audio signal is synchronous with the video frame frequency.
Audio data are processed in frames. For an audio channel, each frame
...