1、EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM = 3404583 omon 340 m EN 60774-3 November 1993 UDC 621.397.454 : 620.1 Descriptors: Video recording, electroacoustic equipment, Videorecorder, magnetic tapes, cassettes for magnetic tapes, recording characteristics English version Helical-scan video t
2、ape cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS Part 3: S-VHS (IEC 774-3: 1993) Systme de magntoscope cassette balayage hlicodal utilisant la bande magntique de 12,65 mm (0,5 in) format VHS Partie 3: S-VHS Video-Bandkassettensystem mit Schrgspuraufzeichnung auf Magnetband 12,65
3、 mm (0,5 in) VHS-Format Teil 3: S-VHS (CE1 774-3: 1993) (IEC 774-3: 1993) This European Standard was approved by CENELEC on 1993-09-22. 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 natio
4、nal 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 version in
5、 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, France,
6、 Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Centra
7、l Secretariat: rue de Stassart 35, B-1050 Brussels O 1993 Copyright reserved to CENELEC members Ref. No. EN 60774-3 : 1993 E 3404583 0305072 287 Page 2 EN 607743 : 1993 Foreword The text of document 60B (CO) 143, as prepared by Sub-committee 60B: Video recording, of IEC %chnical Committee No. 60: Re
8、cording, was submitted to the IEC-CENELEC parallel vote in October 1992. The reference document was approved by CENELEC as EN 60774-3 on 22 September 1993. The following dates were fixed: - latest date of publication of an identical national standard (dop) 1994-10-01 - latest date of withdrawal of c
9、onflicting national standards (dow) 1994-10-01 Annexes designated normative are part of the body of the standard. Annexes designated informative are given only for information. In this standard, annexes A and ZA are normative and annex B is informative. m 3404583 0305073 113 m Page 3 EN 607743 : 199
10、3 CONTENTS SECTION 1 : GENERAL Chuse 1 . 1 1.2 2.1 2.2 3.1 3.2 4.1 4.2 4.3 4.4 4.5 4.6 5.1 5.2 5.3 Scope Normative references SECTION 2: S-VHS VIDEO TAPE CASSETTE Mechanical parameters . 2.1.1 Cassette identification . 2.1.2 Dimensions, reel, front cover, etc Name . SECTION 3: COMPACT S-VHS VIDEO TA
11、PE CASSETTE Mechanical parameters . 3.1.1 Cassette identification . 3.1.2 Dimensions, reel, front cover, .value, etc . Name . SECTION 4: TAPE CHARACTERISTICS OF S-VHS AND COMPACT S-VHS VIDEO CASSETTES Dimensions of magnetic tape . Magnetic tape properties . 4.2.2 Others Reference tape RF recording c
12、urrent characteristics . RF playback output . Leader tape and trailer tape . 4.2.1 Coercivity . SECTION 5: S-VHS VIDEO CASSETTE RECORDERS Tape speed . Others . Track configuration and dimensions . 5.3.1 Record locations . 5.3.2 Others 5 5 6 6 6 6 6 6 6 6 7 7 7 7 7 7 7 7 8 8 8 8 8 m 3404583 0305074 O
13、CT Page 4 EN 60774-3 : 1993 SECTION 6: RECORDING CHARACTERISTICS Chuse Page 6.1 6.2 6.3 6.4 6.5 6.6 FM recording of luminance component . 6.1.1 Sub pre-emphasis and main pre-emphasis . 8 6.1.3 Modulation characteristics 9 6.1.4 Recording level 9 525 line-60 field chrominance signal recording . 9 Lum
14、inance component level in the converted chrominance signal 9 8 6.1.2 Clipping levels . *9 . . 6.2.1 6.2.2 Recording level . 10 625 line-50 field chrominance signal recording . 10 6.3.1 Recording level 10 Pilot burst signal . 10 Phase switching position of the converted carrier colour signal . 10 . 6
15、.3.2 6.3.3 6.3.4 Audio signal recording 11 Y/C separation output 11 FM audio recording . 11 FM audio track pattern for EP and LP modes . 11 6.5.1 6.5.2 Control signal recording 12 FM audio recording of SP mode . 11 Figures . 14 Annexes A Reference tape . 17 B Information concerning orders 17 ZA Othe
16、r international publications quoted in this standard with 18 the references of the relevant European publications . M 3404583 0305075 Tb Page 5 EN 607743 : 1993 HELICAL-SCAN VIDEO TAPE CASSETTE SYSTEM USING 12,65 mm (0,5 in) MAGNETIC TAPE ON TYPE VHS Part 3: S-VHS SECTION 1: GENERAL 1.1 Scope This p
17、art of International Standard IEC 774 (second edition) applies to magnetic video recording on 12,65 mm (0,5 in) wide tape 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
18、for the recordings. The requirements relate to the 525 line-60 field and 625 line-50 field TV systems. Equipment manufactured according to this part of IEC 774 and tapes recorded following this part provide the necessary interchangeability of recorded video cassettes. 1.2 Normative references The fo
19、llowing normative documents contain provisions which, through reference in this text, constitute provisions of this pari of IEC 774. 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 thi
20、s part of IEC 774 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IEC 756: 1991, Non-broadcast video tape recorders - Time base stabili
21、ty. IEC 774: 1983, Helical-scan video tape cassette system using 12,65 mm (0,5 in) magnetic tape on type VHS IEC 774-1: 199x, Helical-scan video tape cassette system using 12,65 mm (0.5 in) magnetic tape on type VHS - Part 1: General IEC 774-2: 199x, Helical-scan video tape cassette system using 12,
22、65 mm (03 in) magnetic tape on type VHS - Part 2: FM audio recording (under consideration) IEC 1041 -1 : 1990, Non-broadcast video tape recorders - Methods of measurement - Part I: General video (NTSWPAL) and audio (longitudinal) characteristics IEC 1041 -3: 199x, Non-broadcast video tape recorders
23、- Methods of measurement - Part 3: Audio characteristics for FM recording (under consideration) IEC 1054: 1991, Helical-scan video tape cassette system using 12,65 mm (03 in) magnetic tape on type VHS - FM audio recording 3404583 OL0507b 922 Page 6 EN 60774-3 : 1993 SECTION 2: S-VHS VIDEO TAPE CASSE
24、TTE 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 Other mechanical parameters except 2.1.1 above, shall conform to IEC 774-1. Dimensions, reel, front cover, etc. 2.2 Name The following type name s
25、hall be used for S-VHS video cassettes. ST-XXX for 525 line-60 field. SE-XXX for 625 line-50 field. (XXX indicates tape length in minutes.) The indication of tape length in minutes shall conform to IEC 774-1. SECTION 3: COMPACT S-VHS VIDEO TAPE CASSETTE 3.1 Mechanical parameters 3.1 .l Cassette iden
26、tification Compact S-VHS video cassettes shall have an identification hole (ID hole) defined in figure 2. 3.1 -2 Other mechanical parameters except item 3.1.1 above, shall conform to IEC 774-1. Dimensions, reel, front cover, ?-value, etc. 3.2 Name The following type name shall be used for the compac
27、t S-VHS video cassettes. ST-CXX for 525 line-60 field. SE-CXX for 625 line-50 field. (XX indicates tape length in minutes.) The indication of tape length in minutes shall conform to IEC 774-1. W 3404583 0305077 869 m Page 7 EN 607743 : 1993 SECTION 4: TAPE CHARACTERISTICS OF S-VHS AND COMPACT S-VHS
28、VIDEO CASSETTES 4.1 Dimensions of magnetic tape Regarding the dimensions of magnetic tape, IEC 774-1 shall apply. 4.2 Magnetic tape properties 4.2.1 Coercivity The coercivity shall be approximately 70 x lo3 Nm. 4.2.2 Others Regarding other items such as type of magnetic tape, and magnetic orientatio
29、n, IEC 774-1 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 110 % with reference to the standard recording current. The standard recording
30、current is defined at 6,5 MHz as the value which is necessary to obtain the maximum output signal level for the reference tape SRT-1. 4.5 RF playback output When 6.5 MHz sine wave is recorded with standard recording current and the output of the frequency sine wave is measured, it should be as follo
31、ws with respect to the RF playback output of the reference tape. RF playback output: -1 dB or more at 6,5 MHz. 4.6 Leader tape and trailer tape The leader and trailer tape for S-VHS and compact S-VHS video cassettes shall conform to IEC 774-1. 3404583 0305078 7T5 H TV system Standard speed (SP mode)
32、 525 line-60 field 33.35 mmls 10.5 %o 625 line-50 field 23.39 mm/s f0,5 % Page 8 EN 607743 : 1993 Low speed (EP or LP mode) EP mode: 11,12 mm/s 10,s % LP mode: 11.70 mmls +0,5 % SECTION 5: S-VHS VICE0 CASSETTE RECORDERS The EP (Extended Play) mode is applicable only to 525 line-60 field TV system an
33、d the LP (Long Play) mode, only to 625 line-50 field TV system. 5.2 Others Regarding the drum diameter, tape tension, and inclined azimuth angle, IEC 774-1 shall apply 5.3 Track configuration and dimensions 5.3.1 Record locations The track configuration and dimensions for EP and LP modes shall be in
34、 accordance with figure 3, and table 2. Regarding SP mode. IEC 774-1 shall apply. 5.3.2 Others Regarding other items such as switching position, video signal overlap, and the relation- ship between the video track and the video signal field, IEC 774-1 shall apply. SECTION 6: RECORDING CHARACTERISTIC
35、S 6.1 6.1 .1 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 charac- teristics of the main pre-emphasis, IEC 774-1 shall apply. FM recording of luminance component Sub pre-emphasis and main pre-
36、emphasis 3404583 0305079 631 Reference white level Reference sync levei Frequency deviation. white to sync Page 9 EN 607743 : 1993 7.0 MHz I 0,l MHz 5,4 MHz i 0,l MHz 1,6 MHz f 0.1 MHz 6.1.2 Clipping levels Clipping levels are shown below. The level from sync tip to peak white is 100 %. White clippi
37、ng level: (210 i 10) % measured from sync tip. Dark clipping level: (-70 I 10) % measured from sync tip. 6.1.3 Modulation characteristics FM carrier frequencies corresponding to reference video levels shall be as shown in the following table 1. Table 1 - FM carrier frequency 525 line-60 field, 625 l
38、ine-50 field The FM carrier shall be interleaved in the EP mode for 525 line-60 field, and in both of the SP and the LP modes for 625 line-50 field. In these modes, the FM carrier frequency recorded by the channel-1 video head shall be fh/2 higher than that of channel-2. (For 525 line-60 field, fh=1
39、5,734 kHz, and for 625 line-50 field, fh=15,625 kHz.) 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. NOTE - Optimum recording current is the recording current value which is necessary to obtain th
40、e maximum output signai level during playback. 6.2 525 line-60 field chrominance signal recording Regarding all items except those stated below, IEC 774-1 shall apply. 6.2.1 The amplitude of the converted luminance recording signal located in the vicinity of 1.2 MHz shall be attenuated by more than
41、20 dB below the chrominance reference signal level. Luminance component level in the converted chrominance signal NOTE - The reference level of chrominance signal is half of the burst level in the converted signal, because it is boosted by 6 dB. 3404583 OL050BO 353 Page 10 EN 607743 : 1993 6.2.2 Rec
42、ording level The chrominance signal is recorded with the FM signal acting as bias. Its recording level shall be set so that the playback levei of spurious components at frequency $-2fc is 20 dB to 25 dB below the output level at frequency fy. fy: Centre carrier frequency of luminance signal (6,5 MHz
43、). f,: Converted chrominance sub-carrier frequency. 6.3 625 Ilne-50 field chrominance signal recording These recording processes are illustrated in figure 4. Regarding all items except those stated below, IEC 774-1 shall apply. 6.3.1 Recording level The chrominance signal is recorded with the FM sig
44、nal acting as bias. Its recording level shall be set so that the playback level of spurious components at frequency fh-2fc is 20 dB to 25 dB below the output level at frequency fy. fy: Centre carrier frequency of luminance signal (6.5 MHz). fc: Converted chrominance sub-carrier frequency. 6.3.2 Pilo
45、t burst signal The following type of pilot burst signal shall be added to the recording chrominance signal: Frequency: same frequency as the converted chrominance sub-carrier. Level: O Yo to +20 Oh with respect to the colour burst signal level. Burst length : Position: 2,26 ps f 0,23 ps. 0,8 ps f 0,
46、3 ps from leading edge of the horizontal sync signal to the burst start. Phase: 1) when the high frequency luminance signal is combined with the converted chrominance signal, the pilot burst signal phase shall be 90“ * 10“ with respect to the U axis of the input signal; 2) when the luminance recordi
47、ng signal which is converted to the 1,2 MHz area is attenuated by more than 20 dB with reference to the chrominance signal, the phase shall be 270“ i 10“. 6.3.3 In order not to interfere with the pilot burst signal phase, the phase switching shall perform at a position corresponding to the front por
48、ch. Phase switching position of the converted carrier colour signal = 3404583 0105081 29T I Item Page 11 EN 607743 : 1993 EP mode 525 line-60 field LP mode 625 line-50 field I 6.3.4 Y/C separation output When using this output the residual signals of luminance around 3.8 MHz which may appear in the
49、chrominance channel shall be attenuated by more than 20 dB. NOTE - Before recording, the chrominance signal and the luminance signal are extracted from the input video composite signal. Following this extraction the chrominance signal may contain some residual signals of luminance as spurious signals which affect the picture quality in playing back. These disturbances occur mainly when the frequencies of the spurious signals are located in the 3,8 MHr region which corresponds to the end of the lower sideband of the subcarrier. 6.4 Audio signal recording Regarding the lon
