1、BRITISH STANDARD BS EN 60774-1:1994 IEC 774-1: 1994 Helical-scan video tape cassette system using 12.65 mm (0.5 in) magnetic tape on type VHS Part 1: VHS and compact VHS video cassette system The European Standard EN 60774-1:1994 has the status of a British Standard UDC 621.397.454BSEN 60774-1:1994
2、This British Standard, having been prepared under the directionof the Electronic Equipment Standards Policy Committee, was published underthe authority of the Standards Board and comes into effect on 15 July 1994 BSI 12-1999 First published February 1984 Second edition July 1994 The following BSI re
3、ferences relate to the work on this standard: Committee reference EEL 22 Draft for comment 92 22010 DC ISBN 0 580 23388 X Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the nation
4、al committees of the following countries: Austria Italy Belgium Luxembourg Denmark Netherlands Finland Norway France Portugal Germany Spain Greece Sweden Iceland Switzerland Ireland United Kingdom Amendments issued since publication Amd. No. Date CommentsBSEN 60774-1:1994 BSI 12-1999 i Contents Page
5、 Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN 60774-1 5 National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN 60774-1:1994 ii BSI 12-1999 National foreword This Part o
6、f BS EN 60774 has been prepared under the direction of the Electronic Equipment Standards Policy Committee and is the English language version of EN 60774-1:1994 Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS Part 1: VHS and compact VHS video cassette syste
7、m, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 774-1:1994 published by the International Electrotechnical Commission (IEC). For ease of publication, some of the figures also include the French text. This standard supersedes BS 6482:198
8、4, which is withdrawn. 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 pages T
9、his document comprises a front cover, an inside front cover, pagesi andii, theENtitle page, pages2 to44, 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 indicated in the amendment table on the inside fr
10、ont cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60774-1 February 1994 UDC 621.397.454 Supersedes HD 463 S1:1987 Descriptors: Electroacoustics, electroacoustic equipment, video recording, magnetic recording, video tape recorders, magnetic tapes, cassettes for magnetic tapes, recording
11、characteristics, mechanical properties, electrical properties, dimensions, interchangeability English version Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS Part 1: VHS and compact VHS video cassette system (IEC 774-1:1994) Systme de magntoscope cassette ba
12、layage hlicodal utilisant la bande magntique de 12,65 mm (0,5 in) de format VHS Partie 1: Systme de cassette vido VHS et VHS compacte (CEI 774-1:1994) Video-Bandkassettensystem mit Schrgspuraufzeichnung auf Magnetband 12,65 mm (0,5 in) VHS-Format Teil 1: VHS- und kompaktes VHS Video-Kassettensystem
13、(IEC 774-1:1994) This European Standard was approved by CENELEC on 1993-12-08. 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
14、 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 version in any other language made by translation under the respons
15、ibility 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, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Ne
16、therlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. 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 1994 C
17、opyright reserved to CENELEC members Ref. No. EN 60774-1:1994 EEN60774-1:1994 BSI 12-1999 2 Foreword The text of document 60B(CO)150, as prepared by Sub-Committee 60B: Video recording, of IEC Technical Committee 60: Recording, was submitted to the IEC-CENELEC parallel vote in April 1993. The referen
18、ce document was approved by CENELEC as EN 60774-1 on 8 December 1993. This European Standard replaces HD 463 S1:1987. 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 this standard
19、, Annex A, Annex B, Annex C and Annex ZA are normative and Annex D and Annex E are informative. Contents Page Foreword 2 Section 1. General 1.1 Scope 5 1.2 Normative references 5 1.3 Environment 5 Section 2. VHS video tape cassette 2.1 Mechanical parameters 5 2.1.1 Cassette dimensions 5 2.1.2 Reel d
20、imensions 5 2.1.3 Tape winding and tape path 5 2.1.4 Unlocking of front cover 5 2.1.5 Opening of front cover 6 2.1.6 Releasing of reel brake 6 2.1.7 Reel spring 6 Section 3. Compact VHS video cassette 3.1 Mechanical parameters 6 3.1.1 Cassette dimensions 6 3.1.2 Front cover 6 3.1.3 Reel dimensions a
21、nd brake force 6 3.1.4 Tape winding and tape path 6 3.1.5 E value 6 3.1.6 Guide rollers 6 Page 3.1.7 Reel spring force 7 3.1.8 Positioning screw of take-up reel 7 Section 4. Tape characteristics of VHS and compact VHS cassette 4.1 Dimensions of the video tape 7 4.1.1 Magnetic tape thickness 7 4.1.2
22、Magnetic tape width 7 4.1.3 Magnetic tape length 7 4.2 Magnetic tape properties 7 4.2.1 Type of magnetic tape 7 4.2.2 Magnetic orientation 7 4.2.3 Coercivity 7 4.3 Reference tape 7 4.4 Leader tape and trailer tape 7 4.4.1 Automatic stop 7 4.4.2 Dimensions of the leader and trailer tape (VHS cassette
23、) 7 4.4.3 Dimensions of the leader and trailer tape (compact VHS cassette) 7 4.4.4 Splicing 8 4.5 Amount of tape remaining 8 Section 5. Video cassette recorders 5.1 Tape speed 8 5.2 Drum diameter 8 5.3 Tape tension 8 5.4 Inclined azimuth angle 8 5.5 Track configuration and dimensions 8 5.5.1 Record
24、locations 8 5.5.2 Switching position and video signal overlap 8 5.5.3 Relations of video track and video signal field 8 Section 6. Recording characteristics 6.1 FM recording of luminance component 9 6.1.1 Low-pass filter 9 6.1.2 Pre-emphasis and clipping 9 6.1.3 Modulation characteristics 9 6.1.4 FM
25、 high-pass filter 9 6.1.5 Recording level 9 6.2 NTSC chrominance signal recording 9 6.2.1 Recording method 9 6.2.2 Phase rotation of the chrominance signal 9 6.2.3 Recording level 9 6.2.4 Colour burst amplitude doubler 9 6.3 PAL chrominance signal recording 10 6.3.1 Recording method 10 latest date o
26、f publication of an identical national standard (dop) 1995-01-01 latest date of withdrawal of conflicting national standards (dow) 1995-01-01EN60774-1:1994 BSI 12-1999 3 Page 6.3.2 Phase rotation of the chrominance signal 10 6.3.3 Recording level 10 6.4 SECAM chrominance signal recording 10 6.4.1 Re
27、cording method 10 6.4.2 Recording level 10 6.5 Audio signal recording 10 6.5.1 Recording level 10 6.5.2 De-emphasis characteristics 10 6.6 Control signal recording 10 6.6.1 Recording signal 10 6.6.2 Polarity 10 6.6.3 Recording current wave-form 11 Annex A (normative) Type of VHS cassettes and specif
28、ications 38 Annex B (normative) Designation of compact VHS video cassettes and specifications 38 Annex C (normative) Reference tape 39 Annex D (informative) Compact VHS video cassette adaptor 39 Annex E (informative) Alternative method of SECAM chrominance signal recording 41 Annex ZA (normative) Ot
29、her international publications quoted in this standard with the references of the relevant European publications 43 Figure 1 Appearance of videocassette. Top and side view 12 Figure 2 Appearance of videocassette. Bottom view 14 Figure 3 Inner structures 16 Figure 4 Relationship between reels and ree
30、l spindles 18 Figure 5 Reel dimensions 19 Figure 6 Tape winding and tape path 20 Figure 7 Complete cassette case (1) 21 Figure 8 Complete cassette case (2) 22 Figure 9 Cassette lower half (1) 23 Figure 10 Cassette lower half (2) 24 Figure 11 Upper cassette half 25 Figure 12 Cassette reference plane
31、26 Figure 13 Front cover with locking structure 27 Figure 14 Front cover without locking structure 28 Figure 15 Supply reel and reel brake 29 Figure 16 Take-up reel and reel brake 30 Figure 17 Tape winding and guide rollers 31 Page Figure 18 Relative positions of reels with respect to cassette case
32、32 Figure 19 Track configuration and basic design dimensions (view from magneto-sensitive side). See Table 2 33 Figure 20 Block diagram of recording NTSC or PAL colour video signal 34 Figure 21 Block diagram of recording SECAM colour video signal 35 Figure 22 FM high-pass filter 35 Figure 23 Pre-emp
33、hasis characteristics of luminance signal 36 Figure 24 Control signal wave-form and polarity 37 Figure D.1 Example of compact video cassette adaptor 40 Figure D.2 Main parts and movement of the compact video cassette adaptor 40 Figure E1 (alternative) Block diagram of recording method 1 SECAM colour
34、 video signal 41 Figure E2 (alternative) Block diagram of NTSC, PAL and method 2 SECAM (4,4336 MHz) colour video signal 42 Table 1 FM carrier frequency 9 Table 2 Track configuration (see Figure 19) 114 blankEN60774-1:1994 BSI 12-1999 5 Section 1. General 1.1 Scope This part of IEC 774 is applicable
35、to the basic VHS and compact VHS video cassette system. Compact VHS video cassette is used just like the normal VHS video cassette with the aid of a cassette adaptor (see Annex D for an example of a compact video cassette adaptor) for recording and/or reproducing video and audio signals in accordanc
36、e with the system defined in this standard. This standard defines the electrical and mechanical parameters and the necessary characteristics of the VHS and the compact VHS video cassette system. The requirements relate to the 525 line-60 field and 625 line-50 field TV systems. Equipment manufactured
37、 according to this standard and tapes recorded following this standard, 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 IEC
38、 774. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 774 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below.
39、 Members of IEC and ISO maintain registers of currently valid International Standards. IEC 94-1:1981, Magnetic tape sound recording and reproducing systems Part 1: General conditions and requirements. IEC 756:1991, Non-broadcast video tape recorders Time base stability. IEC 1041-1:1990, Non-broadcas
40、t video tape recorders Methods of measurement Part 1: General video (NTSC/PAL) and audio (longitudinal) characteristics. IEC 1041-3:199x, Non-broadcast video tape recorders Methods of measurement Part 3: Audio characteristics for FM recording (in preparation). IEC 1054:1991, Helical-scan video tape
41、cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS-FM audio recording. IEC 1105:1991, Reference tapes for video tape recorder systems. 1.3 Environment Tests and measurements made on the system to check the requirements of this standard shall be carried out under the following conditio
42、ns: Section 2. VHS video tape cassette 2.1 Mechanical parameters 2.1.1 Cassette dimensions The dimensions of the cassette shall be in accordance with Figure 1 to Figure 4. 2.1.2 Reel dimensions The dimensions of reels shall be in accordance with Figure 5. 2.1.3 Tape winding and tape path The tape wi
43、nding and the tape path shall be in accordance with Figure 6. The E value of the tape pack shall be greater than 1,5 mm. See note 4 of Figure 4, for E value. 2.1.4 Unlocking of front cover The unlocking of the front cover shall be accomplished when a force no greater than 0,15 N is applied to the co
44、ver unlocking pin, as shown in note 8 of Figure 1. Temperature: 20 C 1 C Relative humidity: (50 2) % Barometric pressure: 86 kPa to 106 kPa.EN60774-1:1994 6 BSI 12-1999 2.1.5 Opening of front cover The force necessary to open the front cover as shown in note 3 of Figure 3, shall be less than 1 N. 2.
45、1.6 Releasing of reel brake The reel brake shall be released by the reel brake unlocking pin as shown in note 4 of Figure 3, with a force less than 0,7 N. 2.1.7 Reel spring The reels in the cassette shall be pushed down by the reel spring with a force of 1,6 N, with the reels in the position indicat
46、ed in Figure 4. Section 3. Compact VHS video cassette 3.1 Mechanical parameters 3.1.1 Cassette dimensions The dimensions of the compact VHS video cassette shall be in accordance with Figure 7 to Figure 12. The cassette dimensions are given for two types of front covers, with and without a front cove
47、r locking structure. 3.1.2 Front cover 3.1.2.1 Front cover with a locking structure The front cover with a locking structure is shown in Figure 13. With this type of cassette, a permanent spring force is used to keep the front cover shut. The forces F 1and F 2necessary to open the front cover with t
48、he lock released, as defined in note 1 of Figure 13, shall be as follows: 0,1 N k F 1k 0,25 N 0,05 N k F 2k 0,2 N Even when the front cover is locked, it shall be forcibly released with a force F 3of less than 0,8 N applied to the unlocking position, as indicated in note 3 of Figure 13. The unlockin
49、g pin shall be pushed to the unlocking position indicated in note 4 of Figure 13 with a force F 4less than 0,8 N. The unlocking pin shall be pushed to the surface of the cassette side wall with a force F 5less than 3 N (see note 6 of Figure 13). 3.1.2.2 Front cover without a locking structure The front cover without a locking structure is shown in Figure 14. The front cover has two stable positions, completely closed and completely open. The front cover shall open or close b
