1、ITU-T RECMN*N-bO 93 48b2592 0583963 87 E INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STAN DA RDI ZATI ON SECTOR OF ITU MAINTENANCE OF INTERNATIONAL SOUND-PROGRAMME AND TELEVISION TRANSMISSION CIRCUITS N.60 (03/93) NOMINAL AMPLITUDE OF VIDEO SIGNALS AT VIDEO INTERCONNECTION POINTS I
2、TU-T Recommendation N.60 (Previously ?CCIlT Recommendation?) ITU-T RECMNrN-60 93 4862591 0583964 713 9 FOREWORD The ITU Telecornmunication Standardization Sector (ITU-T) is a permanent organ of the Intemational Telecom- munication Union. The ITU-T is responsible for studying technical, operating and
3、 tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, established the topics for study by the ITU-T Study Groups which, in their turn, pr
4、oduce Recommendations on these topics. ITU-T Recommendation N.60 was revised by the ITU-T Study Group IV (1988-1993) and was approved by the WTSC (Helsinki, March 1-12, 1993). NOTES 1 As a consequence of a reform process within the International Telecommunication Union (ITU), the CCITT ceased to exi
5、st as of 28 February 1993. In its place, the ITU Telecommunication Standardization Sector (ITU-T) was created as of 1 March 1993. Similarly, in this reform process, the CCIR and the IFRI3 have been replaced by the Radiocommunication Sector. In order not to delay publication of this Recommendation, n
6、o change has been made in the text to references containing the acronyms “CCITT, CCIR or IFRB” or their associated entities such as Plenary Assembly, Secretariat, etc. Future editions of this Recommendation will contain the proper terminology related to the new ITU structure. 2 telecommunication adm
7、inistration and a recognized operating agency. In this Recommendation, the expression “Administration” is used for conciseness to indicate both a O ITU 1994 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including
8、 photocopying and microfilm, without permission in writing from the ITU. ITU-T RECNN*N-bO 93 48b259L 0583965 b5T I ABSTRACT This Recommendation provides the guidance on the nominal amplitude of picture signals. Keywords Amplitude, television signal, video. Recommendation N.O (03/93) 1 ITU-T RECMN*N=
9、bO 93 m 4862593 05839bb 596 I Recommendation N.60 NOMINAL AMPLITUDE OF VIDEO SIGNALS AT VIDEO INTERCONNECTION POINTS (Published 1964; revised 1968, 1972, 1993) At video interconnection points, the nominal amplitude of the picture signal, measured from the blanking level to the white level should be
10、0.7 V (0.714 V for system M signals), while the nominal amplitude of the synchronizing pulses should be 0.3 V (0.286 V for system M signals), so that the nominal peak-to-peak amplitude of a monochrome video signal should be 1.0 V. The addition of colour information results in an increase in the over
11、all amplitude of the video signal. The magnitude of this increase depends upon the colour system employed, but should not exceed 25% (i.e. nominal amplitude of composite colour video signal I 1.25 V). Figure 1 shows the waveform of a video signal. White level i I IIU 1111 II A Cdour burst amplitude
12、* A A Pedestal amplitude Synchronizing signal amplitude Time *t T0403560-92/401 FIGURE 1N.60 Waveform of one line of video signal At video interconnection points, the nominal amplitude of the multiplexed analogue components (MAC) signal is 1 Volt. It is defined as the difference between 624 line whi
13、te level and black level. Figures 2a and 2b illustrate MAC signal waveform. Recommendation N.60 (03/93) 1 ITU-T RECMN+N=bO 93 I 4862571 0583967 422 I h a ? II E E o 3 n L _-. 2 I- II II II am* u) h ICI I -4 -u II II Il am* .- Recommendation N.60 (03/93) ITU-T RECMN*N.bO 93 41362593 0583968 369 I U E Recommendation N.60 (03/93) 3
