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1 INTERNATIONAL STANDARD IEC First edition Recording Helical-scan digital video cassette recording system using 6,35 mm magnetic tape for consumer use (525-60, , and systems) Part 2: SD format for and systems This English-language version is derived from the original bilingual publication by leaving out all French-language pages. Missing page numbers correspond to the Frenchlanguage pages. Reference number IEC :1998(E)
2 INTERNATIONAL STANDARD IEC First edition Recording Helical-scan digital video cassette recording system using 6,35 mm magnetic tape for consumer use (525-60, , and systems) Part 2: SD format for and systems IEC 1998 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: Telefax: Web: Commission Electrotechnique Internationale International Electrotechnical Commission Международная Электротехническая Комиссия XF
3 IEC: CONTENTS FOREWORD Clause 1 General Scope Normative reference Definitions, symbols and abbreviations Environment and test conditions Reference tape Calibration tape Record locations and dimensions Calibration signals Purchase Helical recordings Record location and dimensions The effective area upper edge Record and playback guarantee Overwrite margin (OM) Switching margin for recording amplifiers Scanner example Programme track data arrangement Introduction Labelling convention Audio sector Structure Sync patterns ID part Pre-sync block Post-sync block Data-sync block Video sector Structure Sync patterns ID part Pre-sync block Post-sync block Data-sync block Subcode sector Structure Sync patterns ID part Pre-sync block Post-sync block Data-sync block Audio interface Video interface Audio signal processing Introduction Error correction code Inner error correction code Outer error correction code Randomization pattern Audio encoding Encoding mode Emphasis Audio error code Sample to data byte conversion... 35
4 IEC: Clause 6.5 Audio channel allocation Audio block Channel allocation for SD-2ch audio Channel allocation for SD-4ch audio Frame structure Relative audio-video timing Audio frame processing Shuffling method k, 44,1k, 32k modes k-2ch modes Audio auxiliary data (AAUX) Invalid recording Video signal processing Introduction Error correction code Inner error correction code Outer error correction code Randomization pattern Video structure Sampling structure DCT block Macro block Super block Definition of super block number, macro block number and value of the pixel Definition of video segment and compressed macro block DCT processing DCT mode Weighting Output order Tolerance of DCT with weighting Quantization Introduction Bit assignment for quantization Class number Initial scaling Area number Quantization step Variable length coding (VLC) The arrangement of a compressed macro block The arrangement of a video segment Data-sync block and compressed macro block Video auxiliary data (VAUX) Invalid recording Subcode signal processing Introduction Error correction codes Randomization pattern ID data FR ID (first half ID) AP3 and APT TAG ID (index ID, skip ID, PP ID) Absolute track number Sync block number Subcode data Main area and optional area User's tape Pre-recorded tape... 73
5 IEC: Clause 8.6 Rewrite of subcode sector Rewrite of TAG ID and subcode data Insert recording Invalid recording of video and/or audio System data System data for APT = 000b and APM = 000b Pack structure Fixed length pack Variable length pack Pack header Error expression Main area and optional area Concept of main area and optional area Tape MIC AAUX VAUX Subcode MIC Title, chapter, part and program Full recording system of horizontal lines Full recording system of teletext Character information system of consumer digital VCR Full mode Simple mode MIC (memory in cassette) Introduction MIC data structure Main area and optional area Data structure of space Data structure of space MIC contents of a new cassette tape MIC and VCR Event Main event and optional event for space Event header pack Examples of pack arrangement for optional events The correlation between OETM events and text events Maker's optional event Warning system for inconsistency ME flag and TT flag Correcting inconsistency MIC IC Electrical characteristics Memory Multiple bytes operation MIC communication protocol Data structure for digital interface Introduction Data structure DIF sequence DIF block ID part Data part Frame period Playback speed... 99
6 IEC: Annex A (normative) DCT-operation precision Annex B (normative) Data through the digital interface Annex C (informative) Manufacturers Annex D (informative) Bibliography Tables Table 1 Sector location from SSA ( system) Table 2 Sector location from SSA ( system) Table 3 Scanner example Table 4 Application ID of area 1 (AP1) Table 5 Sequence number ( system) Table 6 Sequence number ( system) Table 7 Track pair number ( system) Table 8 Track pair number ( system) Table 9 Application ID of area 2 (AP2) Table 10 Application ID of area 3 (AP3) Table 11 Randomization pattern used for a pre-sync block and a post-sync block Table 12 Randomization pattern used for a data-sync block Table 13 Audio encoding mode in an audio block Table 14 The construction of an audio block Table 15 Basic channel allocation rule in SD-2ch audio Table 16 Basic channel allocation rule in SD-4ch audio Table 17 The number of audio samples per frame (unlocked mode) Table 18 The allowance range of the accumulated difference value between the numbers of audio samples per frame in CH1 and CH Table 19 The number of audio samples per frame (locked mode) Table 20 The construction of video signal sampling (4:2:2) Table 21 Class number and the DCT block Table 22 An example of the classification for reference Table 23 Quantization step Table 24 Length of code-words Table 25 Code-words of variable length coding Table 26 Definition of STA Table 27 Code-words of the QNO Table 28 Randomization pattern used for a subcode-sync block Table 29 Table 30 Subcode data of the main area and recommended data of the optional area for no optional use (for user's tape) Subcode data of the main area and recommended data of the optional area for no optional use (for pre-recorded tape) Table 31 AAUX data of the main area Table 32 VAUX data of the main area Table 33 Event header packs Table 34 Inconsistency status of events by ME flag and TT flag Table 35 Relation of memory size and applied protocol Table 36 DIF block type Table 37 DIF sequence number ( system) Table 38 DIF sequence number ( system) Table 39 TIA data in the header section Table 40 DIF blocks and subcode sync blocks Table 41 DIF blocks and VAUX data-sync blocks Table 42 DIF blocks and audio data-sync blocks Table 43 DIF blocks and compressed macro blocks
7 IEC: Table B.1 Definition of the symbols Table B.2 Definition of the additional symbols about the delays Table B.3 Method of transmitting and recording data of header DIF block Table B.4 Method of transmitting and recording data of subcode DIF block Table B.5 Method of transmitting and recording data of VAUX DIF block Table B.6 Method of transmitting and recording data of AAUX Table B.7 Method of transmitting and recording data of a video DIF block Table B.8 Playback or transmitting error for the symbol C Figures Figure 1 Record location and dimensions Figure 2 Sector location from SSA Figure 3 Sector arrangement on helical track ( system) Figure 4 Sector arrangement on helical track ( system) Figure 5 Frame and tracks ( system) Figure 6 Frame and tracks ( system) Figure 7 Structure of sync blocks in audio sector Figure 8 ID data in audio sector Figure 9 Bit assignment of ID code-words Figure 10 Structure of sync blocks in video sector Figure 11 ID data in video sector Figure 12 Structure of sync blocks in subcode sector Figure 13 ID data in subcode sector Figure 14 Data and inner parity of a data-sync block Figure 15 Data and outer parity of a data-sync block for audio sector Figure 16 The compressing rule Figure 17 Sample to data bytes conversion for 16 bits Figure 18 Sample to data bytes conversion for 12 bits Figure 19 Audio shuffling pattern for system: 48k mode/44,1k mode/32k mode Figure 20 Audio shuffling pattern for system: 48k mode/44,1k mode/32k mode Figure 21 Audio shuffling pattern for system: 32k-2ch mode Figure 22 Audio shuffling pattern for system: 32k-2ch mode Figure 23 Data and outer parity of a data-sync block for video sector Figure 24 Transmitting samples for system Figure 25 Transmitting samples for system Figure 26 DCT block and the pixel coordinate Figure 27 The rightmost DCT block in colour difference signal for system Figure 28 DCT block arrangement for system Figure 29 DCT block arrangement for system Figure 30 Macro block and DCT blocks Figure 31 Super blocks and macro blocks in a frame on TV screen for system Figure 32 Super blocks and macro blocks in a frame on TV screen for system Figure 33 Macro block order in a super block for system Figure 34 Macro block order in a super block for system Figure 35 The output order of a weighted DCT block Figure 36 Area numbers Figure 37 The arrangement of a compressed macro block Figure 38 The arrangement of a video segment after the bit rate reduction Figure 39 The video error code
8 IEC: Figure 40 The relation between the compressed macro block number and the data-sync block Figure 41 Bit assignment for the subcode data and subcode parity Figure 42 Structure of ID data Figure 43 Structure of the absolute track number Figure 44 Recommendation for the recording start position of a tape Figure 45 Numbering of the absolute track number for invalid tracks Figure 46 Main area and optional area ( system) Figure 47 Main area and optional area ( system) Figure 48 The layers of the pack Figure 49 Arrangement of AAUX packs in audio sector Figure 50 Arrangement of VAUX packs in VAUX sync blocks Figure 51 The layers of tape Figure 52 The division of tape Figure 53 An example of recorded topic data on tape Figure 54 Recording order of topic data Figure 55 Text unit for simple mode Figure 56 Data structure of space Figure 57 Optional events order of space Figure 58 MIC contents of new cassette tape Figure 59 Examples of pack arrangement for optional events Figure 60 State transition of ME flag and TT flag Figure 61 Multi-bytes writing operation for the I 2 C protocol Figure 62 An example of multi-bytes reading operation for the I 2 C protocol Figure 63 Block diagram on the digital interface Figure 64 Data structure for transmission Figure 65 Transmission order of DIF blocks in a DIF sequence Figure 66 ID data in a DIF block Figure 67 Data in the header section Figure 68 Data in the subcode section Figure 69 Data in the VAUX section Figure 70 Data in the audio section Figure 71 Data in the video section Figure A.1 Measurement method of DCT operation precision
9 IEC: INTERNATIONAL ELECTROTECHNICAL COMMISSION RECORDING HELICAL-SCAN DIGITAL VIDEO CASSETTE RECORDING SYSTEM USING 6,35 mm MAGNETIC TAPE FOR CONSUMER USE (525-60, , and systems) Part 2: SD format for and systems 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 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 has been prepared by subcommittee 100B: Audio, video and multimedia information storage systems, of IEC technical committee 100: Audio, video and multimedia systems and equipment. The text of this standard is based on the following documents: FDIS 100B/168/FDIS Report on voting 100B/180/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. IEC consists of the following parts, under the general title Recording Helical-scan digital video cassette recording system using 6,35 mm magnetic tape for consumer use (525-60, , and systems) Part 1:1998, General specifications Part 2: SD format for and systems Part 3: HD format for and systems 1) Part 4: The pack header table and the contents Part 5: The character information system 1) To be published.
10 IEC: This part 2 describes the specifications for and systems which are not included in part 1. Part 1 describes the common specifications which are cassettes, helical recordings, modulation method, magnetization and basic system data. Part 3 describes the specifications for and systems which are not included in part 1 and part 2. Part 4 describes the pack header table and the contents of packs which are applicable to the whole recording system of helical-scan digital video cassette. Part 5 describes the character information system which is applicable to the whole recording system of helical-scan digital video cassette. For manufacturing SD digital video cassette recording systems, part 1, part 2, part 4 and part 5 are referred to. For manufacturing HD digital video cassette recording systems, part 1, part 2, part 3, part 4 and part 5 are referred to. Annexes A and B form an integral part of this standard. Annexes C and D are for information only.
11 IEC: RECORDING HELICAL-SCAN DIGITAL VIDEO CASSETTE RECORDING SYSTEM USING 6,35 mm MAGNETIC TAPE FOR CONSUMER USE (525-60, , and systems) Part 2: SD format for and systems 1 General 1.1 Scope This part of IEC specifies the content, format and recording method of the data blocks forming the helical records on the tape containing audio, video, and system data. It describes the specifications for the 525-line system with a frame frequency of 29,97 Hz (hereinafter referred to as system) and 625-line system with a frame frequency of 25,00 Hz (hereinafter referred to as system) which are not included in part 1. One video channel and two independent audio channels are recorded in the digital format. Each of these channels is designed to be capable of independent editing. The video channel records and reproduces a component television signal in and systems. In this part, the data structure of a track is defined by APT = 000b which consists of four areas as described in in part 1 and AP1 = AP2 = AP3 = 000b. 1.2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents listed below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 60461:1986, Time and control code for video tape recorders IEC 60735:1991, Measuring methods for video tape properties IEC 60958:1989, Digital audio interface ITU-R Recommendation BT601-5:1995, Studio encoding parameters of digital television for standard 4:3 and wide screen 16:9 aspect ratios ITU-R Report 624-4:1990, Characteristics of television systems
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