1、BRITISH STANDARD BS EN 62070:2001 Broadcast digital video tape recorders Identification method for recording and/or reproduction error status The European Standard EN 62070:2001 has the status of a British Standard ICS 33.160.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWB
2、S EN 62070:2001 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 BSI 8 October 2001 ISBN 0 580 38555 8 National foreword Thi
3、s British Standard is the official English language version of EN 62070:2001. It is identical with IEC 62070:2001. The UK participation in its preparation was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems and equipment, which has the responsibility to: A list of organ
4、izations represented on this committee can be obtained on request 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 syste
5、m to the other, publications may contain identifiers from both 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 Correspon
6、dence Index”, or by using the “Find” facility of the BSI Standards 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
7、 itself confer immunity from legal obligations. aid enquirers to understand the text; present 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
8、 them in the UK. Summary of pages 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 Comments
9、EUROPEAN STANDARD EN 62070 NORME EUROPENNE EUROPISCHE NORM May 2001 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2001 CENELEC
10、 - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62070:2001 E ICS 33.160.40 English version Broadcast digital video tape recorders - Indentification method for recording and/or reproduction error status (IEC 62070:2001) Magntoscopes numri
11、ques de radiodiffusion - Mthode daffichage de ltat des erreurs denregistrement et/ou de lecture (CEI 62070:2001) Digitale Videorecorder fr den Fernsehrundfunk - Anzeigeverfahren des Fehlerstatus bei Aufnahme und/oder Wiedergabe (IEC 62070:2001) This European Standard was approved by CENELEC on 2001-
12、04-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be ob
13、tained on application to the Central Secretariat 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 Ce
14、ntral Secretariat has the same status as the official 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
15、and United Kingdom.EN 62070:2001 - 2 - Foreword The text of document 100B/281/FDIS, future edition 1 of IEC 62070, prepared by SC 100B, Audio, video and multimedia information storage systems, of IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel
16、 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 (dop) 2002-01-01 latest date by which the national standards conflicting
17、 with the EN have to be withdrawn (dow) 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 added by CENELEC. _
18、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 61105 NOTE: Harmonized as EN 61105:1993 (not
19、 modified). _ Page2 EN62070:2001 8October2001PD 66:270210 2- ISB 1002-70 CONTENTS Page FOREWORD2 Clause 1 Scope4 2 Normative references4 3 Terms and definitions4 3.1 Definitions4 3.2 Abbreviations.5 4 Go/No go indicator (GNGI)5 4.1 Colour of the indicator.5 4.2 Meaning of the colours.5 4.3 Holding t
20、ime of the light6 5 Error rate indicator (ERI).6 Annex A (normative) Error measurement.7 Annex B (informative) Error estimation methods for GNGI.9 Annex ZA (normative) Normative references to international publications with their corresponding European publications11 Bibliography10 Table A.1 An exam
21、ple of VTR error rate8 Page3 EN62070:2001 8October200162070 IEC:2001 7 BROADCAST DIGITAL VIDEO TAPE RECORDERS INDICATING METHOD FOR RECORDING AND/OR REPRODUCTION ERROR STATUS 1 Scope This International Standard specifies methods for indicating the record and/or reproduction error status of broadcast
22、-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 specified her
23、ein: 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 documents c
24、ontain 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 encouraged t
25、o 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 ISO maintain registers of currently valid International Standards. IEC 60050(702
26、):1992, International Electrotechnical 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 of this Interna
27、tional 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 Page4 EN62070:2001 8October200162070 IEC:2001 9 3.1.2 bit error rate the error rate for a binary signal 3.1.3 block unit which separate
28、s 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 702-05-09 3.1.6 byte error rate error rate for a signal constructed from byte units
29、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 elements to
30、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 ERI Error rate indicator GNGI Go/No go indicator 4 Go/No go indicator (GNGI) NOTE The GNGI is provided to assist the operatio
31、n 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 colour 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. Errors
32、 are corrected without resort to concealment. No artifact due to errors occurs in video and/or audio. Page5 EN62070:2001 8October200162070 IEC:2001 11 Yellow: Marginal operation. Errors are severe enough to result in artifacts in video and/or audio. Corrective action such as maintenance is required
33、for the VTR and/or tape. Red: Normal operation impossible. Errors are severe enough not to be recovered by the error correction and concealment. Significant degradation of video and/or audio may occur. The technique used to estimate the severity of the error rate, and hence the status signalled by t
34、he GNGI, 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 light Holding time of the red light shall be no less than 0,5 s. 5 Error rate indicator (ERI) The unit for the ERI shall be the byte error rate. The byte error
35、rate shall be calculated from the result of the decoding for the Reed Solomon (RS) product error correction code (see annex A). NOTE The ERI is provided to a VTR as a maintenance aid. The error rate is indicated for each channel or each head. Page6 EN62070:2001 8October200162070 IEC:2001 13 Annex A
36、(normative) Error 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 colu
37、mn codes are termed the inner code and the outer code, respectively. Inner block: RS(n1, k1) code Outer block: RS(n2, k2) codeSync ID Data Inner parity P1 Outer parity P2 k1 k2 n1 n2 IEC 220/01 Figure A.1 Typical structure of RS product error correction code The block error rate is derived from the
38、calculation for the inner parity. The byte error rate is calculated from the block error rate as follows. The relationship between the byte error rate and the block error rate is given in equation A.1, assuming the reproduced noise to be Gaussian (noise). The q value of the errors which can be corre
39、cted in the code is an integer chosen from (n-k) to (n-k)/2. a) Relationship without error correction Pblock = 1-(1-Pbyte) n (A.1a) b) Relationship with error correction Pblock = 1-(1-Pbyte) n - n C 1 Pbyte(1-Pbyte) n-1- n C 2 Pbyte2(1-Pbyte) n-2- n C 3 Pbyte3(1-Pbyte) n-3 - n C q Pbyteq(1-Pbyte) n-
40、q (A.1b) where Pblock is the block error rate Pbyte is the byte error rate Page7 EN62070:2001 8October200162070 IEC:2001 15 The calculated results of the relationship between block error rate and byte error rate are shown in table A.1 for RS(93,85)code and RS(84,76)code where q = 3. Table A.1 An exa
41、mple of VTR error rate Byte error rate before error correction n=93 n=84 Block error rate after error correction Without error correction With error correction Without error correction With error correction 10 0 10 0 10 0 10 0 10 0 10 1 1,1x10 3 1,9x10 2 1,3x10 3 2,1x10 2 10 2 1,1x10 4 9,0x10 3 1,2x
42、10 4 9,9x10 3 10 3 1,1x10 5 4,7x10 3 1,2x10 5 5,2x10 3 10 4 1,1x10 6 2,6x10 3 1,2x10 6 2,8x10 3 Page8 EN62070:2001 8October200162070 IEC:2001 17 Annex B (informative)Error estimation methods for GNGI It is necessary to estimate errors occurring in the reproduced video signal for lighting the GNGI. I
43、n 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 from the product of the byte error rate and an appropriate coefficient. The coefficient may be derived experimentally. Method 2
44、a) Count errors in the signal by direct counting of the outer block error flags. Page9 EN62070:2001 8October200162070 IEC:2001 19 Bibliography IEC 61055-1:1991, Measurement techniques and operational adjustments of broadcast VTRs Part 1: Operational adjustments on analogue composite broadcast VTRs I
45、EC 61055-2:1991, Measurement techniques and operational adjustments of broadcast VTRs Part 2: Special mechanical measurements and alignments IEC 61105:1991, Reference tapes for video tape recorder systems ITU-R Recommendation BT.471-1: Nomenclature and description of colour bar signals ITU-R Recomme
46、ndation 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 A) SMPTE 273M:1995, Television Status Monitoring and Diagnostics Protocol _ Page10 EN62070:2001 8October2001- 3 - EN 62070:2001
47、Annex ZA (normative) Normative references to international publications with their corresponding European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and
48、 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 in it by amendment or revision. For undated references the latest edition of the publication referred to applies (in
49、cluding amendments). NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60050-702 1992 International electrotechnical vocabulary Chapter 702: Oscillations, signals and related devices - ITU-R Recommendation BT.601-5 1995 Encoding parameters of digital television for studios - Page
