IEC 61880-2-2002 Video systems (525 60) - Video and accompanied data using the vertical blanking interval Analogue interface - Part 2 525 progressive scan syste.pdf

1、INTERNATIONAL STANDARD IEC 61880-2 First edition 2002-09 Video systems (525/60) Video and accompanied data using the vertical blanking interval Analogue interface Part 2: 525 progressive scan system Reference number IEC 61880-2:2002(E)Publication numbering As from 1 January 1997 all IEC publications

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8、x: +41 22 919 03 00INTERNATIONAL STANDARD IEC 61880-2 First edition 2002-09 Video systems (525/60) Video and accompanied data using the vertical blanking interval Analogue interface Part 2: 525 progressive scan system IEC 2002 Copyright - all rights reserved No part of this publication may be reprod

9、uced 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 de Varemb, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: +41 22 919 02 11 Telefax:

10、 +41 22 919 03 00 E-mail: inmailiec.ch Web: www.iec.ch F For price, see current catalogue PRICE CODE Commission Electrotechnique Internationale International Electrotechnical Commission 2 61880-2 IEC:2002(E) CONTENTS FOREWORD 3 1 Scope 4 2 Definitions and abbreviations 4 3 Construction of identifica

11、tion signal 5 4 Bit and code assignment of the identification signal 6 4.1 General 6 4.2 WORD-0: Identification data for the video information signal . 6 4.3 WORD-1 and WORD-2 . 6 4.4 CRCC. 6 5 Transmission frame . 7 6 Designation 7 Annex A (normative) Aspect ratio and picture display format 8 A.1 A

12、spect ratio 8 A.2 Picture display format.8 Annex B (normative) Copy control information system 9 B.1 Copy control information 9 B.2 CGMS-A 9 B.3 APS trigger bit.10 B.4 Analogue source bit 10 Figure 1 Identification signal waveform 4 Figure 2 Signal inserted line in vertical blanking interval . 4 Fig

13、ure 3 Identification data format . 5 Figure 4 CRCC generator . 6 Figure A.1 Aspect ratio 7 Figure A.2 Picture display format 7 Table 1 Aspect ratio and display format. 5 Table B.1 Bit assignment of WORD1. 8 Table B.2 CGMS-A 8 Table B.3 Bit assignment of CGMS-A 9 Table B.4 Bit assignment of APS trigg

14、er bits 9 Table B.5 Bit assignment of analogue source bit .1061880-2 IEC:2002(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ VIDEO SYSTEMS (525/60) VIDEO AND ACCOMPANIED DATA USING THE VERTICAL BLANKING INTERVAL ANALOGUE INTERFACE Part 2: 525 progressive scan system FOREWORD 1) The IEC (Internatio

15、nal Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic

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22、ernational Standard IEC 61880-2 has been prepared by IEC technical committee 100: Audio, video and multimedia systems and equipment. The text of this standard is based on the following documents: FDIS Report on voting 100/444/CDV 100/502/RVC Full information on the voting for the approval of this st

23、andard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until 2004. At this date, the publication will be recon

24、firmed; withdrawn; replaced by a revised edition, or amended. 4 61880-2 IEC:2002(E) VIDEO SYSTEMS (525/60) VIDEO AND ACCOMPANIED DATA USING THE VERTICAL BLANKING INTERVAL ANALOGUE INTERFACE Part 2: 525 progressive scan system 1 Scope This part of IEC 61880 specifies the aspect ratio code and the cop

25、y control information code and the method of transfer of these codes in the vertical blanking interval of the luminance signal. It is applicable to the transfer of video related information with the video signal through the baseband analogue signal of the 525-line/60-frame progressive scan video sys

26、tem. This standard is applicable to analogue video signal interfaces between digital and analogue video equipment as follows: digital video equipment to digital video equipment; digital video equipment to analogue video equipment; analogue video equipment to digital video equipment; analogue video e

27、quipment to analogue video equipment. 2 Definitions and abbreviations For the purposes of this document the following definitions and abbreviations apply. 2.1 CRCC cyclic redundancy check code for error detection 2.2 CGMS-A copy generation management system on analogue video interface, for use in di

28、gital video recorders and players 2.3 APS analogue protection system, to control analogue copying from digital transmission or from digital copies of a video signal 2.4 IRE linear scale for measuring the relative amplitude of the video signal with a reference at the blanking level, in which pure whi

29、te is defined as 100 IRE and the blanking level is 0 IRE. NOTE IRE is the abbreviation for the Institute of Radio Engineers.61880-2 IEC:2002(E) 5 3 Construction of identification signal The identification signal consists of a reference signal of 70 % (70-IRE) and a 20-bit digital data signal indicat

30、ed by 0 % (0-IRE) or 70 % (70-IRE) in the effective video signal period of one horizontal line. The signal waveform is shown in Figure 1. The 20-bit digital data signal is coded as an identification signal for video related information. The identification signal is inserted in the horizontal line 41

31、 of luminance signal (Y signal) for the 525-line/60-frame progressive scan video system. The signal inserted line is shown in Figure 2. The clock frequency (f c ) of the 525-line/60-frame system shall be: f c= f h33 = 1,0385 MHz where f h= 31,468 kHz (horizontal scan frequency) Ref bit1 bit2 bit3 bi

32、t20 70 0,3 70 % 10 % of white peak (Logical 1) 50 % T 30 ns 6T 0,15 s 22T (21,2 s 0,22 s) 100 % 0 -30 0 1,0 V 0(Logical 0) +10 - 5 % IEC 2200/02 () ns 963 33 1 h = = f T NOTE The cumulative timing error for each bit number 1 to bit number 20, measured from the 50 % amplitude point of the rising edge

33、 of the reference bit, should be within 0,22 s. Figure 1 Identification signal waveform Logical 1 to be transmitted is represented by 70 % (70-IRE) and logical 0 to be transmitted is represented by 0 % (0-IRE) in the effective video signal. 525 16 789 1 0 1 1 1 21 34 14 4 4 5 6H Vertical sync interv

34、al Vertical blanking interval 46 524 Line number45H 0,75 s 6H 32H IEC 2201/02 Figure 2 Signal inserted line in vertical blanking interval 6 61880-2 IEC:2002(E) 4 Bit and code assignment of the identification signal 4.1 General The 20-bit digital data signal consists of WORD-0 (2 bits), WORD-1 (4 bit

35、s), WORD-2 (8 bits) and CRCC (6 bits), as illustrated in Figure 3. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 WORD-0 2 bits Bit data WORD-1 4 bits WORD-2 8 bits CRCC 6 bits IEC 2202/02 Figure 3 Identification data format 4.2 WORD-0: Identification data for the video information signal The WO

36、RD-0 code assignments that identify the picture aspect ratio and display format are specified in Table 1. Table 1 Aspect ratio and display format Applications Bit number 1 Bit number 2 Aspect ratio Picture display format Remarks 0 0 4:3 Normal 1 0 16:9 Normal 0 1 4:3 Letter box 11 R e s e r v e d Se

37、e Annex A If the aspect ratio information is not indicated, bit assignments of WORD-0 shall be 00. Bit assignment 11 is reserved for a future application. 4.3 WORD-1 and WORD-2 Code assignments for WORD-1 and WORD-2 are specified in Annex B. WORD-1 is the header code which indicates the meaning of t

38、he data in WORD-2. Non-specified code assignments in WORD-2 shall be set to 0. Non-specified bit combinations shall be ignored by the receiving equipment, and the receiving equipment shall interpret only the bit combinations which can be handled by the receiving equipment. 4.4 CRCC CRCC is the error

39、 check code. The generator polynomial G(X) of the CRCC is as shown in the following formula (see Figure 4): G(X) = X 6+ X + 1 Preset of CRCC in Figure 4 shall be all 1.61880-2 IEC:2002(E) 7 S1 D + + a b S2 Output Input DDDDD IEC 2203/02 Figure 4 CRCC generator The CRCC is generated in successive ste

40、ps as follows: 1) S1 is closed, and S2 is set to position a; 2) 14 bits data are input from the beginning; 3) S1 is opened, S2 set to position b, and CRCC is output from bit number 15. 5 Transmission frame The same data shall be carried on every frame. 6 Designation The equipment which deals with th

41、e data of this standard shall use the designation ID-2. The name of this information system is defined as VIDEO ID. 8 61880-2 IEC:2002(E) Annex A (normative) Aspect ratio and picture display format A.1 Aspect ratio The meaning of aspect ratio as specified in 4.2 is as follows (see Figure A.1): aspec

42、t ratio 4:3 means that pictures are captured at an aspect ratio 4:3, and converted into a video signal; aspect ratio 16:9 means that pictures are captured at an aspect ratio of 16:9, and compressed to a ratio of 4:3. Then the compressed pictures are converted into a video signal. 4 16:9 standard fra

43、me 16:9 compressed frame 4:3 standard frame 3 4 3 16 9 IEC 2204/02 Figure A.1 - Aspect ratio A.2 Picture display format The meaning of picture display format as specified in 4.2 is illustrated in Figure A.2. Normal Letter box IEC 2205/02 Figure A.2 - Picture display format61880-2 IEC:2002(E) 9 Annex

44、 B (normative) Copy control information system B.1 Copy control information The copy control information signal is transmitted between video recorders and/or video players in the data of WORD- 2 when WORD-1 in the 20-bit identification data format is set to 0000 (see Table B.1). When the code 0000 i

45、s present in WORD-1, the data of WORD-2 shall be transferred by the rate of two or more frames per 2 s. Table B.1 Bit assignment of WORD-1 Bit number of WORD-1 3 4 5 6 Application of WORD-2 Data form 0000 Copy control information Flags (see Table B.2) The copy control information is specified as fol

46、lows: a) CGMS-A: copy generation management system in an analogue signal for use in video recorders and players.CGMS-A consists of two bits of digital information; b) APS trigger bits: identification bits for triggering generation of a pseudo-sync (PSP) and an inverted split colour burst element; c)

47、 analogue source bit: copy control information to indicate whether the source of the incoming video signal originated from an analogue pre-recorded medium When copyright information is not to be transferred, WORD-1 shall be set to the default value 1111. B.2 CGMS-A The CGMS-A signal consists of bit

48、number 7 and bit number 8 of WORD-2 in the 20-bit identification data format. Table B.2 CGMS-A Bit number of WORD 2 Applications Contents 7 Copyright 8 Copy generation bit See Table B.3 Bit number 7 of CGMS-A information identifies whether copyright is being asserted via CGMS- A. Bit number 8 of CGMS-A information identifies whether, in the light of the status of the bit number 7, copying of