1、BRITISH STANDARD BS EN 60774-3:1994 IEC 774-3: 1993 Specification for Helical-scan video tape cassette system using12.65mm(0.5in) magnetic tape on typeVHS Part3: S-VHS The European Standard EN60774-3:1993 has the status of a BritishStandard UDC 621.397.454:620.1BSEN60774-3:1994 This BritishStandard,
2、 having been prepared under the directionof the Electronic Equipment Standards Policy Committee, was published underthe authority of the Standards Board and comesinto effect on 15May1994 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference EEL/22 Draft fo
3、r comment91/34805DC ISBN 0 580 23020 1 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national committees of the following countries: Austria Italy Belgium Luxembourg Denmark
4、Netherlands Finland Norway France Portugal Germany Spain Greece Sweden Iceland Switzerland Ireland United Kingdom Amendments issued since publication Amd. No. Date CommentsBSEN60774-3:1994 BSI 01-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text o
5、f EN60774-3 5 National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN60774-3:1994 ii BSI 01-2000 National foreword This Part of this BritishStandard has been prepared under the direction of the Electronic Equipme
6、nt Standards Policy Committee and is the English language version of EN60774-3:1993 Helical-scan video tape cassette system using12,65mm(0,5in) magnetic tape on type VHS. Part3: S-VHS, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC774-3:1
7、993, published by the International Electrotechnical Commission (IEC). Additional information. Currently, both single-layer and double-layer tapes are available from different manufacturers. Double-layer coating allows the long and short wavelength characteristics of the tape to be designed separate
8、ly. This can be especially beneficial for chroma noise in colour-under systems. S-VHS recorders with a menu set-up facility have been recently introduced, which allows the user to select equalization (and possibly other record or reproduce characteristics) to match the type of tape in use. For the p
9、urposes of this set-up system, tapes have to be identified as type1,2,3 or4. It is understood that currently type2 is double-layer coated, type3 is single-layer and types1 and4 are not yet in use. A New Work Item Proposal has been submitted to the IEC proposing an amendment to IEC774-3 to incorporat
10、e information on the different tapes available and their uses. 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 fr
11、om legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicate
12、d in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN60774-3 November1993 UDC 621.397.454:620.1 Descriptors: Video recording, electroacoustic equipment, videorecorder, magnetic tapes, cassettes for magnetic tapes, recording characteristics English ve
13、rsion Helical-scan video tape cassette system using12,65mm (0,5in) magnetic tape on type VHS Part3: S-VHS (IEC774-3:1993) Systme de magntoscope cassette balayage hlicodal utilisant la bande magntique de12,65mm(0,5in) format VHS Partie3: S-VHS (CEI774-3:1993) Video-Bandkassettensystem mit Schrgspurau
14、fzeichnung auf Magnetband12,65mm(0,5in) VHS-Format Teil3: S-VHS (IEC774-3:1993) This European Standard was approved by CENELEC on1993-09-22. 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
15、national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A versi
16、on 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 official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, Fr
17、ance, Germany, Greece, Iceland, Ireland, Italy,Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland andUnitedKingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Cent
18、ral Secretariat: rue de Stassart 35, B-1050 Brussels 1993 Copyright reserved to CENELEC members Ref. No. EN60774-3:1993 EEN60774-3:1993 BSI 01-2000 2 Foreword The text of document60B (CO)143, as prepared by Sub-Committee60B: Video recording, of IEC Technical Committee No.60: Recording, was submitted
19、 to the IEC-CENELEC parallel vote in October1992. The reference document was approved by CENELEC as EN60774-3 on22September1993. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given only for information. In th
20、is standard, Annex A and Annex ZA are normative and Annex B is informative. Contents Page Foreword 2 Section 1. General 1.1 Scope 5 1.2 Normative references 5 Section 2. S-VHS video tape cassette 2.1 Mechanical parameters 5 2.1.1 Cassette identification 5 2.1.2 Dimensions, reel, front cover, etc. 5
21、2.2 Name 5 Section 3. Compact S-VHS video tape cassette 3.1 Mechanical parameters 5 3.1.1 Cassette identification 5 3.1.2 Dimensions, reel, front cover, E-value, etc. 6 3.2 Name 6 Section 4. Tape characteristics of S-VHS and compact S-VHS video cassettes 4.1 Dimensions of magnetic tape 6 4.2 Magneti
22、c tape properties 6 4.2.1 Coercivity 6 4.2.2 Others 6 4.3 Reference tape 6 4.4 RF recording current characteristics 6 4.5 RF playback output 6 4.6 Leader tape and trailer tape 6 Section 5. S-VHS video cassette recorders 5.1 Tape speed 6 5.2 Others 6 5.3 Track configuration and dimensions 7 5.3.1 Rec
23、ord locations 7 5.3.2 Others 7 Section 6. Recording characteristics 6.1 FM recording of luminance component 7 6.1.1 Sub pre-emphasis and main pre-emphasis 7 6.1.2 Clipping levels 7 6.1.3 Modulation characteristics 7 6.1.4 Recording level 7 6.2 525 line-60 field chrominance signalrecording 7 6.2.1 Lu
24、minance component level in theconverted chrominance signal 7 6.2.2 Recording level 8 6.3 625 line-50 field chrominance signalrecording 8 latest date of publication of an identical national standard (dop)1994-10-01 latest date of withdrawal of conflicting national standards (dow)1994-10-01EN60774-3:1
25、993 BSI 01-2000 3 Page 6.3.1 Recording level 8 6.3.2 Pilot burst signal 8 6.3.3 Phase switching position of the converted carrier colour signal 8 6.3.4 Y/C separation output 8 6.4 Audio signal recording 8 6.5 FM audio recording 8 6.5.1 FM audio recording of SP mode 8 6.5.2 FM audio track pattern for
26、 EP and LP modes 9 6.6 Control signal recording 9 Annex A (normative) Reference tape 14 Annex B (informative) Information concerningorders 14 Annex ZA (normative) Other international publications quoted in this standard with thereferences of the relevant European publications 14 Figure 1 Identificat
27、ion hole (ID hole) of cassette 11 Figure 2 Identification hole (ID hole) of compact cassette 11 Figure 3 Track configuration and basic designdimensions (view from magneto-sensitive side), see Table 2 12 Figure 4 Block diagram of recording625 line-50 field system 13 Table 1 FM carrier frequency 7 Tab
28、le 2 Track configuration, see Figure 3 10 Table 3 Response characteristics of sub pre-emphasis (without sync) 104 blankEN60774-3:1993 BSI 01-2000 5 Section 1. General 1.1 Scope This part of International Standard IEC774 (second edition) applies to magnetic video recording on12,65mm(0,5in) wide tape
29、using the wide band VHS recording system. The basic S-VHS video cassette and the compact S-VHS video cassette are defined as well as the necessary parameters and characteristics for the recordings. The requirements relate to the525 line-60 field and625 line-50 field TV systems. Equipment manufacture
30、d according to this part of IEC774 and tapes recorded following this part provide the necessary interchangeability of recorded video cassettes. 1.2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of I
31、EC774. At the time of publication of this standard, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC774 are encouraged to investigate the possibility of applying the most recent editions of the normative documents
32、 indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC756:1991, Non-broadcast video tape recorders Time base stability. IEC774:1983, Helical-scan video tape cassette system using12,65mm(0,5in) magnetic tape on type VHS. IEC774-1:199x, Helical-scan
33、 video tape cassette system using12,65mm(0,5in) magnetic tape on type VHS Part1: General. IEC774-2:199x, Helical-scan video tape cassette system using12,65mm(0,5in) magnetic tape on type VHS Part2: FM audio recording (under consideration). IEC1041-1:1990, Non-broadcast video tape recorders Methods o
34、f measurement Part1: General video (NTSC/PAL) and audio (longitudinal) characteristics. IEC1041-3:199x, Non-broadcast video tape recorders Methods of measurement Part3: Audio characteristics for FM recording (under consideration). IEC1054:1991, Helical-scan video tape cassette system using12,65mm(0,
35、5in) magnetic tape on type VHS FM audio recording. Section 2. S-VHS video tape cassette 2.1 Mechanical parameters 2.1.1 Cassette identification S-VHS video cassettes shall have an identification hole (ID hole) defined in Figure 1. 2.1.2 Dimensions, reel, front cover, etc. Other mechanical parameters
36、 except2.1.1 above, shall conform to IEC774-1. 2.2 Name The following type name shall be used for S-VHS video cassettes. ST-XXX for525 line-60 field. SE-XXX for625 line-50 field. (XXX indicates tape length in minutes.) The indication of tape length in minutes shall conform to IEC774-1. Section 3. Co
37、mpact S-VHS video tape cassette 3.1 Mechanical parameters 3.1.1 Cassette identification Compact S-VHS video cassettes shall have an identification hole (ID hole) defined in Figure 2.EN60774-3:1993 6 BSI 01-2000 3.1.2 Dimensions, reel, front cover, E-value, etc. Other mechanical parameters except ite
38、m3.1.1 above, shall conform to IEC774-1. 3.2 Name The following type name shall be used for the compact S-VHS video cassettes. ST-CXX for525 line-60 field. SE-CXX for625 line-50 field. (XX indicates tape length in minutes.) The indication of tape length in minutes shall conform to IEC774-1. Section
39、4. Tape characteristics of S-VHS and compact S-VHS video cassettes 4.1 Dimensions of magnetic tape Regarding the dimensions of magnetic tape, IEC774-1 shall apply. 4.2 Magnetic tape properties 4.2.1 Coercivity The coercivity shall be approximately70 10 3 A/m. 4.2.2 Others Regarding other items such
40、as type of magnetic tape, and magnetic orientation, IEC774-1 shall apply. 4.3 Reference tape The reference tape numbered SRT-1 is applicable. Details are described later in Annex A. 4.4 RF recording current characteristics The optimum recording current shall be within 10% with reference to the stand
41、ard recording current. The standard recording current is defined at6,5MHz as the value which is necessary to obtain the maximum output signal level for the reference tape SRT-1. 4.5 RF playback output When6,5MHz sine wave is recorded with standard recording current and the output of the frequency si
42、ne wave is measured, it should be as follows with respect to the RF playback output of the reference tape. RF playback output:1dB or more at6,5MHz. 4.6 Leader tape and trailer tape The leader and trailer tape for S-VHS and compact S-VHS video cassettes shall conform to IEC774-1. Section 5. S-VHS vid
43、eo cassette recorders 5.1 Tape speed The EP (Extended Play) mode is applicable only to525 line-60 field TV system and the LP (Long Play) mode, only to625 line-50 field TV system. 5.2 Others Regarding the drum diameter, tape tension, and inclined azimuth angle, IEC774-1 shall apply. TV system Standar
44、d speed (SP mode) Low speed (EP or LP mode) 525 line-60 field 33,35mm/s 0,5% EP mode:11,12mm/s 0,5% 625 line-50 field 23,39mm/s 0,5% LP mode:11,70mm/s 0,5%EN60774-3:1993 BSI 01-2000 7 5.3 Track configuration and dimensions 5.3.1 Record locations The track configuration and dimensions for EP and LP m
45、odes shall be in accordance with Figure 3, and Table 2. Regarding SP mode, IEC774-1 shall apply. 5.3.2 Others Regarding other items such as switching position, video signal overlap, and the relationship between the video track and the video signal field, IEC774-1 shall apply. Section 6. Recording ch
46、aracteristics 6.1 FM recording of luminance component 6.1.1 Sub pre-emphasis and main pre-emphasis The luminance signal shall be sub pre-emphasized and main pre-emphasized. The characteristics of the sub pre-emphasis are shown in Table 3. Regarding the characteristics of the main pre-emphasis, IEC77
47、4-1 shall apply. 6.1.2 Clipping levels Clipping levels are shown below. The level from sync tip to peak white is100%. White clipping level:(210 10)% measured from sync tip. Dark clipping level:(70 10)% measured from sync tip. 6.1.3 Modulation characteristics FM carrier frequencies corresponding to r
48、eference video levels shall be as shown in the following Table 1. Table 1 FM carrier frequency The FM carrier shall be interleaved in the EP mode for525 line-60 field, and in both of the SP and the LP modes for625 line-50 field. In these modes, the FM carrier frequency recorded by the channel-1 vide
49、o head shall be f h /2 higher than that of channel-2. (For525 line-60 field, f h =15,734kHz, and for625 line-50 field, f h =15,625kHz.) 6.1.4 Recording level The recording current shall have the optimum value at all frequencies within the entire FM carrier range, as defined in Table 1. NOTEOptimum recording current is the recording current value which is necessary to obtain the maximum output signal level during playback. 6.2 525 line-60 field chrominance signal recording Regarding all items except those stated below, IEC
