1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 . TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#%G0G0/&G0G0).4%2.!4)/.!,3/5.$G0 G002/2!-%G0G0!.$G0G04%,%6)3)/.42!.3-)33)/.G0G0#)2#5)434%34G0G03).!,3G0G04/G0G0“%G0G053%$G0G0“94(%G0G0“2/!$#!34).G0G0/2!.):!4)/.3$52).G0G04(%G0G002%0!2!4/29G0G00%2)/$)
2、45G134G0G0RecommendationG0G0. (Extract from the “LUEG0“OOK)NOTES1 ITU-T Recommendation N.63 was published in Fascicle IV.3 of the Blue Book. This file is an extract from theBlue Book. While the presentation and layout of the text might be slightly different from the Blue Book version, thecontents of
3、 the file are identical to the Blue Book version and copyright conditions remain unchanged (see below).2 In this Recommendation, the expression “Administration” is used for conciseness to indicate both atelecommunication administration and a recognized operating agency. ITU 1988, 1993All rights rese
4、rved. No 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 ITU.Fascicle IV.3 - Rec. N.63 1Recommendation N.63Fascicle IV.3 - Rec. N.63TEST SIGNALS TO BE USED BY THE
5、 BROADCASTING ORGANIZATIONSDURING THE PREPARATORY PERIODAfter the broadcasting organizations have taken over the international television connection, they may decideto make measurements on the complete connection from the point where the television programme is produced to thepoint or points where i
6、t is to be received.The broadcasting organizations often use live pictures for testing during the preparatory period, especiallywhen a standards convertor is involved. If for any reason they should need to send test signals then it is desirable that thetelecommunication Administrations should recomm
7、end the broadcasting organizations in their countries to send signalsthat are in accordance with those recommended in Recommendation N.67 (at levels in accordance withRecommendation N.60), so that the staff at intermediate video interconnection points can, if necessary, compare theresults of the mea
8、surements made by the broadcasting organizations with those obtained by the telecommunicationAdministrations during the line-up period. There is no occasion to readjust the output levels of the station equipmentsince these have already been set during the line-up period.All test signals transmitted
9、prior to the actual television transmission, being full field or otherwise, should besuperimposed with the identification of the broadcaster and location from where the test signal is originating. Thisidentification may be transmitted either in monochrome, or in colour, according to preference or to
10、 suit the technicalrequirements of the particular test signal being transmitted. If the local language of the originating source is not aninternationally recognized language then the identification signal should be displayed not only in the local language ofthe country concerned but also in one of t
11、he internationally recognized languages.When a full field signal is transmitted simply as a means to check link or tandem connection continuity, it maycomprise any suitable composite video signal (such as test pattern, pulse/bar or other suitable picture or pattern)provided that it contains specific
12、 signal components that include Peak White, synchronizing pulses and the identificationsignal (as previously described) of the station or broadcaster transmitting the signal. The composite signal (colour barsplus captions, etc.) must not exceed 1 volt (peak-to-peak) in order to preclude interference with adjacent video channels,particularly on half transponder satellite operation.When television pictures which contain electronically generated components, e.g. captions, are used, theout-of-band-spectral power in any 4 kHz band above 1.2 times the nominal video bandwidth shall not exceed 50 dB.
