1、BRITISH STANDARD Broadcast digital video tape recorders - Identification method for recording andor reproduction error status The European Standard EN 62070:ZOOl has the status of a British Standard ICs 33.160.40 BS EN 62070:2001 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMiTTED BY COPYRIGHT LAW
2、 - BS EN 62070:2001 National foreword This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 8 October 2001 This British Standard is the official
3、 English language version of EN 62070:ZOOl. It is identical with IEC 62070:ZOOl. The UK participation in its preparation was entrusted to Technical Committee EPU100, Audio, video and multimedia systems and equipment, which has the responsibility to: - - aid enquirers to understand the text; present
4、to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this committee can be obtained on re
5、quest to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from bo
6、th systems. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Sta
7、ndards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of p
8、ages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 11 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date I Comments 8 BSI 8 October 2001 ISBN
9、O 580 38555 8 EUROPEAN STANDARD EN 62070 NORME EUROPENNE EUROPISCHE NORM May 2001 ICs 33.160.40 English version Broadcast digital video tape recorders - Indentification method for recording and/or reproduction error status (IEC 62070:2001) Magntoscopes numriques de radiodiffusion - Fernsehrundfunk -
10、 Mthode daffichage de ltat des erreurs denregistrement et/ou de lecture (CE1 62070:2001) (IEC 62070:2001) Digitale Videorecorder fr den Anzeigeverfahren des Fehlerstatus bei Aufnahme und/oder Wiedergabe This European Standard was approved by CENELEC on 2001-04-01. CENELEC members are bound to comply
11、 with the CENICENELEC Internal Regulations which stipulate the condions for giving this European Standard the status of a national standard without any alteration. Upto-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretan
12、at or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the o
13、fficial versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee
14、 for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels Q 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC me
15、mbers. Ref. No. EN 62070:2001 E Page 2 EN 62070:2001 Foreword The text of document 100B/281/FDIS, future edition 1 of IEC 62070, prepared by SC 1008, Audio, video and multimedia information storage systems, of IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CE
16、NELEC parallel vote and was approved by CENELEC as EN 62070 on 2001-04-01. The following dates were fixed: - latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement - latest date by which the national standards conflictin
17、g with the EN have to be withdrawn (dop) 2002-01-01 (daw) 2004-04-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annexes A and ZA are normative and annex B is informative. Annex ZA has been ad
18、ded by CENELEC. Endorsement notice The text of the International Standard IEC 62070:2001 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to be added for the standard indicated: IEC 61 105 NOTE: Harmonized as E
19、N 61 105:1993 (not modified). O 8 October 2001 Page 3 EN 62070:2001 CONTENTS Page FOREWORD 2 Clause 1 Scope 4 2 Normative references 4 3 Terms and definitions 4 3.1 Definitions 4 3.2 Abbreviations . 5 Go/No go indicator (GNGI) 5 4.1 Colour of the indicator . 5 4.2 Meaning of the colours . 5 4.3 Hold
20、ing time of the light 6 5 Error rate indicator (ERI) . 6 Annex A (normative) Error measurement . 7 Annex i3 (informative) Error estimation methods for GNGI . 9 Annex ZA (normative) Normative references to international publications with their corresponding European publications 11 Bibliography 10 Ta
21、ble A.l - An example of VTR error rate 8 4 O 8 October 2001 Page 4 EN 62070:2001 BROADCAST DIGITAL VIDEO TAPE RECORDERS - INDICATING METHOD FOR RECORDING AND/OR REPRODUCTION ERROR STATUS I Scope This International Standard specifies methods for indicating the record and/or reproduction error status
22、of broadcast-grade digital VTRs utilizing a Reed Solomon product error correction code. (This code is hereinafter referred to as RS.) This standard also specifies methods of measuring the error rates in record and/or reproduction modes to indicate the error status. The following two indicators are s
23、pecified herein: Go/No go indicator (hereinafter GNGI) for operational use. Error rate indicator (hereinafter ERI) for maintenance use. NOTE This standard may be applicable to other digital television equipment using an RS product error correction code. 2 Normative references The following normative
24、 documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are
25、encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and IS0 maintain registers of currently valid International Standards. I
26、EC 60050(702):1992, International flectrotechnical Vocabulary (IEV) - Chapter 702: Oscilla- tions, signals and related devices ITU-R Recommendation BT.601-5: Studio encoding parameters of digital television for standard 4:3 and wide-screen 16:9 aspect ratios 3 Terms and definitions For the purpose o
27、f this International Standard, the following terms and definitions apply. 3.1 Definitions 3.1.1 bit (binary digit) a number of a set of two elements used to represent information O 8 October 2001 Page 5 EN 62070:ZOOl 3.1.2 bit error rate the error rate for a binary signal 3.1.3 block unit which sepa
28、rates the information byte series into n bytes for adding error correction code 3.1.4 block error rate error rate for a signal constructed from block units 3.1.5 byte 8-bit byte an ordered set of eight binary digits IEV 702-05-091 3.1.6 byte error rate error rate for a signai constructed from byte u
29、nits 3.1.7 error concealment method of error control in which the subjective effects of detected but uncorrected errors can be reduced NOTE Error concealment may be effected, for example, by interpolation of adjacent error-free sample values. 3.1.8 error rate ratio of the number of erroneous element
30、s to the total number of elements reproduced and/or transmitted during a given time interval NOTE The elements may be, for example, digits, code words or blocks. 3.2 Abbreviations ER1 Error rate indicator GNGI Go/No go indicator 4 Go/No go indicator (GNGI) NOTE The GNGI is provided to assist the ope
31、ration of the VTR. 4.1 Colour of the indicator The GNGI shall consist of lights of three colours: red, yellow and green. More than one coiour shall not light simultaneously. 4.2 Meaning of the colours The meaning of the three colour indicators shall be as follows. Green: Normal reliable operation. E
32、rrors are corrected without resort to concealment. No artifact due to errors occurs in video and/or audio. O 8 October 2001 Page 6 EN 62070:ZOOl Yellow: Marginal operation. Errors are severe enough to result in artifacts in video andlor audio. Corrective action such as maintenance is required for th
33、e VTR andlor tape. Red : Normal operation impossible. Errors are severe enough not to be recovered by the error correction and concealment. Significant degradation of video andlor audio may occur. The technique used to estimate the severity of the error rate, and hence the status signalled by the GN
34、GI, will vary according to the design of a particular VTR. An example of error estimation is given in annex B. 4.3 Holding time of the red light shall be no less than 0,5 s. Holding time of the light 5 Error rate indicator (ERI) The unit for the ER1 shall be the byte error rate. The byte error rate
35、shall be calculated from the result of the decoding for the Reed Solomon (RS) product error correction code (see annex A). NOTE The ER1 is provided to a VTR as a maintenance aid. The error rate is indicated for each channel or each head. O 8 October 2001 Page 7 EN 62070:2001 Annex A (normative) Erro
36、r measurement This annex describes the byte error rate measurement and the calculation methods to be applied to the Reed Solomon (RS) product error correction code. The arrangement of the error correction code is constructed two-dimensionally, as shown in figure A.1. The row and column codes are ter
37、med the inner code and the outer code, respectively. Inner block: RS(n1, kl) code Outer block: RS(n2, k2) code kl nl 4 - t IEC 22w01 Figure A.l - Typical structure of RS product error correction code The block error rate is derived from the calculation for the inner parity. The byte error rate is ca
38、lculated from the block error rate as follows. The relationship between the byte error rate and the block error rate is given in equation A.l, assuming the reproduced noise to be Gaussian (noise). The q value of the errors which can be corrected in the code is an integer chosen from (n-k) to (n-k)/2
39、. a) Relationship without error correction b) Relationship with error correction Pblock = I-(I-Pbyte)“ (A.la) Pblock = l-(l-Pbyte)n-,CIPbyte(l-Pbyte)“l -,CzPbyte2( 1 -Pbyte)“- -,C3Pbyte3( 1 -Pbte)“ a -,C,Pbyteq( I-Pbyte)“. (A.l b) where Pblock is the block error rate Pbyte is the byte error rate O 8
40、 October 2001 Page 8 EN 62070:2001 The calculated results of the relationship between block error rate and byte error rate are shown in table A.l for RS(93,85)code and RS(84,76)code where q = 3. Table A.l -An example of VTR error rate O 8 October 2001 Page 9 EN 62070:2001 Annex B (informative) Error
41、 estimation methods for GNGI It is necessary to estimate errors occurring in the reproduced video signal for lighting the GNGI. In this annex, two error estimation methods are provided. Method 1 a) Obtain byte error rate from the inner block error rate (see annex A). b) Estimate errors in the signal
42、 from the product of the byte error rate and an appropriate coefficient. The coefficient may be derived experimentally. Method 2 a) Count errors in the signal by direct counting of the outer block error flags. O 8 October 2001 Page 10 EN 62070:2001 Bibliograph y IEC 61 055-1:1991, Measurement techni
43、ques and operational adjustments of broadcast VTRs - Part I: Operational adjustments on analogue composite broadcast VTRs IEC 61 055-2:1991, Measurement techniques and operational adjustments of broadcast VTRs - Part 2: Special mechanical measurements and alignments IEC 61 105:1991, Reference tapes
44、for video tape recorder systems ITU-R Recommendation BT.471-1: Nomenclature and description of colour bar signals ITU-R Recommendation 656-3, Interfaces for digital component video signals in 525-line and 625-line television systems operating at the 4:2:2 level of Recommendation ITU-R BT. 601 (Part
45、A) SMPTE 273M:1995, Television - Status Monitoring and Diagnostics Protocol O 8 October 2001 Page 1 1 EN 62070:2001 Annex ZA (normative) Normative references to international publications with their corresponding European publications This European Standard incorporates by dated or undated reference
46、, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated
47、in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). NOTE ENIHD applies. Publication - Year EN/HD - Year IEC 60050-702 1992 International electrotechnical vocabulary - Chapter 702: Oscillations, signals and related d
48、evices When an international publication has been modified by common modifications, indicated by (mod), the relevant ITU-R 1995 Encoding parameters of digital Recommendation television for studios BT.601-5 O 8 October 2001 BS EN 62070:2001 BSI 389 Chiswick High Road London w4 4AL BSI - British Stand
49、ards Institution is1 is the independent national body responsible for preparing 3ritish Standards. It presents the UK view on standards in Europe and at the nternational level. It is incorporated by Royal Charter. Eevisions 3ritish Standards are updated by amendment or revision. Users of 3ritish Standards should make sure that they possess the latest amendments or !ditionS. t is the constant aim of BSI to improve the quality of our products and services. Ne would be grateful if anyone finding an inaccuracy or ambiguity while using his British Standard would inform the Se
