1、 INTERNATIONAL STANDARD IEC62447-2 First edition2007-06 Helical-scan compressed digital video cassette system using 6,35 mm magnetic tape Format D-12 Part 2:Compression format Reference number IEC 62447-2:2007(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLI
2、ED BY BOOK SUPPLY BUREAU.THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2007 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,wi
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8、Tel.:+41 22 919 02 11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.INTERNATIONAL STANDARD IEC62447-2 First edition2007-06 Helical-scan compressed digital video cassette system using 6,35 mm magnetic tape Format
9、D-12 Part 2:Compression format XB For price,see current cataloguePRICE CODE Commission Electrotechnique InternationaleInternational Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 62447-2 IEC:2007(E)CONTEN
10、TS FOREWORD.5 1 Scope.7 2 Normative references.7 3 Abbreviations and acronyms.8 4 Data processing.8 4.1 General.8 4.1.1 Video encoding parameter.9 4.1.2 Audio encoding parameter.9 4.1.3 Subcode data.9 4.1.4 Frame structure.9 4.2 Data structure.9 4.3 Header section.11 4.3.1 ID.11 4.3.2 Data.14 4.4 Su
11、bcode section.15 4.4.1 ID.15 4.4.2 Data.15 4.5 VAUX section.19 4.5.1 ID.19 4.5.2 Data.19 4.6 Audio section.23 4.6.1 ID.23 4.6.2 Data.23 4.7 Video section.28 4.7.1 ID.28 4.7.2 Data.28 5 Video compression.32 5.1 Video structure.32 5.1.1 Video sampling structure.32 5.1.2 DCT block.37 5.1.3 Macro block.
12、38 5.1.4 Super block.49 5.1.5 Definition of super block number,macro block number and value of the pixel.49 5.1.6 Definition of video segment and compressed macro block.53 5.2 DCT processing.54 5.2.1 DCT mode.54 5.2.2 Weighting.55 5.2.3 Output order.56 5.3 Quantization.57 5.3.1 Introduction.57 5.3.2
13、 Bit assignment for quantization.57 5.3.3 Quantization step.57 5.4 Variable length coding(VLC).58 5.5 Arrangement of a compressed macro block.61 5.6 Arrangement of a video segment.63 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.6224
14、7-2 IEC:2007(E)3 Annex A(informative)Block diagram of D-12 recorder.67 Annex B(normative)Digital filter for sampling-rate conversion.68 Annex C(informative)Relation to IEC 61834-3.69 Bibliography.70 Figure 1 Data processing block diagram.9 Figure 2 Data structure.10 Figure 3 Data structure of a DIF
15、sequence.11 Figure 4 Data in the subcode section.15 Figure 5 Pack in SSYB.16 Figure 6 Data in the VAUX section.20 Figure 7 Data in the audio section.23 Figure 8 Conversion of audio sample to audio data bytes.25 Figure 9 Arrangement of AAUX packs in audio auxiliary data.25 Figure 10 Sampling structur
16、e for the 1080/60i system.35 Figure 11 Sampling structure for the 1080/50i system.36 Figure 12 Sampling structure for the 720/60p system.37 Figure 13 DCT block and the pixel coordinates for the 1080-line system.41 Figure 14 DCT block and the pixel coordinates for the 720-line system.41 Figure 15 DCT block arrangement for the 1080/60i system.41 Figure 16 DCT block arrangement for the 1080/50i system.41 Figure 17 DCT block arrangement for the 720/60p system.42 Figure 18 Macro block and DCT blocks
