1、BRITISH STANDARD BS EN 60774-4:2003 Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS Part 4: S-VHS video cassette system ET-mode The European Standard EN 60774-4:2003 has the status of a British Standard ICS 33.160.40 BS EN 60774-4:2003 This British Standard
2、was published under the authority of the Standards Policy and Strategy Committee on 26 August 2004 BSI 26 August 2004 ISBN 0 580 44328 0 National foreword This British Standard is the official English language version of EN 60774-4:2003. It is identical with IEC 60774-4:2002. The UK participation in
3、 its preparation was entrusted to Technical Committee EPL/100, Audio, video and multimedia systems, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international
4、 or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to i
5、nclude all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the
6、 interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 10, an inside back cover a
7、nd a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 60774-4 NORME EUROPENNE EUROPISCHE NORM April 2003 CENELEC European Committee for Electrotechnical Standard
8、ization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60774-4:2003
9、E ICS 33.160.40 English version Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS Part 4: S-VHS video cassette system ET-mode (IEC 60774-4:2002) Systme de magntoscope cassette balayage hlicodal utilisant la bande magntique de 12,65 mm (0,5 in) format VHS Parti
10、e 4: Systme de cassette vido S-VHS Mode ET (CEI 60774-4:2002) Videoband-Kassettensystem mit Schrgspuraufzeichnung auf Magnetband 12,65 mm (0,5 in) VHS-Format Teil 4: S-VHS-Video-Kassettensystem - ET-Mode (IEC 60774-4:2002) This European Standard was approved by CENELEC on 2003-04-01. CENELEC members
11、 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 obtained on application
12、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 Central Secretariat has
13、the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerl
14、and and United Kingdom. EN 60774-4:2003 - - 2 Foreword The text of the International Standard IEC 60774-4:2002, prepared by IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the formal vote and was approved by CENELEC as EN 60774-4 on 2003-04-01 without any modification
15、. 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) 2004-04-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2006-04-01 Annexes
16、designated “normative“ are part of the body of the standard. In this standard, annex ZA is normative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60774-4:2002 was approved by CENELEC as a European Standard without any modification. _ 2egaP 4002
17、:447706NEPage2 EN607744:2003 2 607-474 EI:C002(2)E CONTENTS OFREWODR 3 1 Scope 4 2 Normative references. 4 3 Terms and definitions 4 4 Applicable video cassette recorder 4 5 Applicable video cassette 4 6 Video signal recording . 5 6.1 Main pre-emphasis characteristics 5 6.2 Clipping level 5 6.3 FM s
18、ignal recording head current 5 6.4 Converted chrominance signal recording level 6 7 Cassette discrimination system 6 Figure 1 Compensation filter response for 525 line-60 field signals . 6 Figure 2 Pre-emahpssi freqeuncy response fro 525 ilne-06 field signals 7 Figure 3 oCmpensatino fliret resopnse
19、for 265 line-50 field siganls . 8 Figure 4 Pre-emahpssi freqeuncy response fro 625 ilne-05 field signals.9 3egaP 4002:447706NE 2 06774-4 IEC:2002(E) TNOCENTS FOREWORD 3 1 Scope 4 2 Normative references. 4 3 Terms dna definitions 4 4 Applicable video cassette recordre 4 5 Applicable video cassette 4
20、6 Viedo signal recording . 5 6.1 Maip nre-emahpssi cahracterisitcs 5 6.2 Cilpping level 5 6.3 FM signal recording ehda currnet 5 6.4 Cnoverted chrominance siganl recording level 6 7 Cassette discrimination system 6 Figure 1 Compensation filter response for 525 line-60 field signals . 6 Figure 2 Pre-
21、emphasis frequency response for 525 line-60 field signals 7 Figure 3 Compensation filter response for 625 line-50 field signals . 8 Figure 4 Pre-emphasis frequency response for 625 line-50 field signals.9 3egaP 4002:447706NE nnAex ZA (nroma)evit roNmevita refercnese ot tniertannoial bupcilatoisn wit
22、 htrieh corresdnopiuE gnroepap nublicatsnoi . 15 Annex ZA (normative) Normative references to international publications with their corresponding European publications . 10 Page3 EN607744:2003067-474 EI:C002(2)E 5 HELICAL-SCAN VIDEO TAPE CASSETTE SYSTEM USING 12,65 mm (0,5 in) MAGNETIC TAPE ON TYPE
23、VHS Part 4: S-VHS video cassette system ET mode 1 Scope This part of IEC 60774 is applicable to the S-VHS ET mode which records in S-VHS signal format on a VHS cassette. In this mode, several video signal system recording parameters are switched so that the signal characteristics recorded on the VHS
24、 tape are equivalent to S- VHS recording on S-VHS tape. Cassettes recorded in the S-VHS ET mode can be played with the S-VHS-based playback system and the VHS equivalent that includes the SQPB function. This standard indicates the differences from IEC 60774-3 which covers only S-VHS. 2 Normative ref
25、erences The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60774-3:1993, Helical-scan video tape
26、 cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS Part 3: S-VHS 3 Terms and definitions For the purposes of this document, the terms indicated in IEC 60774-3, as well as the following, apply. S-VHS quasi-playback SQPB function to enable the playback of S-VHS tape with a VHS machine
27、4 Applicable video cassette recorder The S-VHS ET mode is applicable for 525 line-60 field and 625 line-50 field signal recording. A video cassette recorder comprising this recording system shall contain a recording system complying with both the VHS video cassette system standard and the S-VHS vide
28、o cassette system standard. The recording system relates to the SP and EP modes for 525 line-60 field and the SP mode only for 625 line-50 field signal recording. 5 Applicable video cassette The recording system applies to video cassettes in compliance with VHS cassette and VHS-C cassettes. Recordin
29、gs in the S-VHS ET mode are not to be made using S-VHS cassettes. 4egaP 4002:447706NEPage4 EN607744:2003 6 607-474 EI:C002(2)E 6 Video signal recording Refer to IEC 60774-3. 6.1 Main pre-emphasis characteristics The main pre-emphasis response is compensated by the following filter: 525 line-60 field
30、 signals: see table 1, figure 1 and figure 2; 625 line-50 field signals: see table 2, figure 3 and figure 4. Table 1 Compensation filter response for 525 line-60 field signals Frequency MHz Response dB 1,0 0,2 0,3 2,0 0,8 0,3 3,0 1,6 0,3 4,0 2,5 0,3 5,0 3,4 0,3 Table 2 Compensation filter response f
31、or 625 line-50 field signals Frequency MHz Response dB 1,0 0,4 0,3 2,0 1,3 0,3 3,0 2,6 0,3 4,0 3,9 0,3 5,0 5,1 0,3 6.2 Clipping level White clipping level (from sync tip): 190 % 10 % (S-VHS specification; 210 % 10 %) Dark clipping level (from sync tip): Unchanged (70 % 10 %) 6.3 FM signal recording
32、head current For the FM carrier frequency band, the optimum recording current shall be set for the applicable video cassette tape. The optimum recording current is defined as that required in order to obtain the maximum playback output. 5egaP 4002:447706NEPage5 EN607744:200360774-4 IE:C002(2)E 7 6.4
33、 Converted chrominance signal recording level A red lustre signal input is recorded so that the playback level of (fy 2fc) frequency spurious component is 20 dB to 25 dB with respect to the fy playback level. fy: Luminance signal centre frequency (6,5 MHz) fc: Converted chrominance sub-carrier frequ
34、ency NOTE A red lustre signal should be referred to IEC 61041-1, 3.3 1 . 7 Cassette discrimination system The S-VHS ET mode shall be selectable only when a cassette in compliance with the VHS standard is inserted. Playback mode detection shall be functioned from the playback FM carrier frequency. R
35、C Output 0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 4,0 3,5 3,0 2,5 2,0 1,5 1,0 0,5 0 Response dB f MHz T = RC = 35 ns R = 1 k C = 35 pF IEC 1824/02 Figure 1 Compensation filter response for 525 line-60 field signals1 IEC 61041-1:1990, Non-broadcast video tape recorders Methods of measurement General
36、, video (NTSC/PAL) and audio (longitudinal) characteristics. 6egaP 4002:447706NEPage6 EN607744:2003 8 607-474 EI:C002(2)E Before compensation f Hz 10 k 100 k 1 M 10 M 0 2 4 6 8 10 12 14 16 Response dB After compensation IEC 1825/02 Figure 2 Pre-emphasis frequency response for 525 line-60 field signa
37、ls 7egaP 4002:447706NEPage7 EN607744:2003067-474 EI:C002(2)E 9 R C Output 0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 4,0 3,0 2,0 1,0 0 Response dB f Hz T = RC = 47,56 ns R = 820 C = 58 pF 5,0 6,0 IEC 1826/02 Figure 3 Compensation filter response for 625 line-50 field signals 8egaP 4002:447706NEPage8
38、EN607744:2003 01 67704-4 EI:C002(2)E Before compensation f Hz 10 k 100 k 1 M 10 M 0 2 4 6 8 10 12 14 16 Response dB After compensation IEC 1827/02 Figure 4 Pre-emphasis frequency response for 625 line-50 field signals _ 9egaP 4002:447706NEPage9 EN607744:2003 - - 3 6 NE770-42:4300 Annex ZA (normative
39、) 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 the publications a
40、re 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 (including amendments)
41、. 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 60774-3 1993 Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS Part 3: S-VHS EN 60774-3 19
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