1、 INTERNATIONAL STANDARD IEC62071-2 First edition2005-10 Helical-scan compressed digital video cassette system using 6,35 mm magnetic tape Format D-7 Part 2:Compression format Reference number IEC 62071-2:2005(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIE
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8、19 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 IEC62071-2 First edition2005-10 Helical-scan compressed digital video cassette system using 6,35 mm magnetic tape Format D-7 Part 2:Co
9、mpression 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
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11、/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.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 secti
12、on.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 betw
13、een 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
14、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 convers
15、ion 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
16、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 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.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 Mac
