1、INTERNATIONALSTANDARDIEC60774-4First edition2002-07Helical-scan video tape cassette systemusing 12,65 mm(0,5 in)magnetic tapeon type VHS Part 4:S-VHS video cassette system ET-modeReference numberIEC 60774-4:2002(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPP
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8、LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.INTERNATIONALSTANDARDIEC60774-4First edition2002-07Helical-scan video tape cassette systemusing 12,65 mm(0,5 in)magnetic tapeon type VHS Part 4:S-VHS video cassette system ET-mode IEC 200
9、2 Copyright-all rights reservedNo part of this publication may be reproduced or utilized in any form or by any means,electronic ormechanical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1
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11、THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 60774-4 IEC:2002(E)CONTENTSFOREWORD.31Scope.52Normative references.53Terms and definitions.54Applicable video cassette recorder.55Applicable video cassette.56Video signal recording.66.1Main pre-emphasis characteristics.66.2Clipping level.66.3FM sig
12、nal recording head current.66.4Converted chrominance signal recording level.77Cassette discrimination system.7Figure 1 Compensation filter response for 525 line-60 field signals.7Figure 2 Pre-emphasis frequency response for 525 line-60 field signals.8Figure 3 Compensation filter response for 625 lin
13、e-50 field signals.9Figure 4 Pre-emphasis frequency response for 625 line-50 field signals.10LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.60774-4 IEC:2002(E)3 INTERNATIONAL ELECTROTECHNICAL COMMISSION_HELICAL-SCAN VIDEO TAPE CASSETT
14、E SYSTEMUSING 12,65 mm(0,5 in)MAGNETIC TAPE ON TYPE VHS Part 4:S-VHS video cassette system ET modeFOREWORD1)The IEC(International Electrotechnical Commission)is a worldwide organization for standardization comprisingall national electrotechnical committees(IEC National Committees).The object of the
15、IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields.Tothis end and in addition to other activities,the IEC publishes International Standards.Their preparation isentrusted to technical committees;any IEC National Committee in
16、terested in the subject dealt with mayparticipate in this preparatory work.International,governmental and non-governmental organizations liaisingwith the IEC also participate in this preparation.The IEC collaborates closely with the InternationalOrganization for Standardization(ISO)in accordance with conditions determined by agreement between thetwo organizations.2)The formal decisions or agreements of the IEC on technical matters express,as nearly as possible,aninternational consensus of opinio
