SMPTE ST 265M-1998 Television Digital Recording - 1 2-in Type D-3 Composite Format - 625 50.pdf
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1、 STD-SMPTE 2b5M-ENGL 3778 D 8357403 O003372 333 I CMPTE STANDARD SMPTE 265M-1998 Revision of ANSVSMPTE 265M-1993 for Television 1/2=in Type 625/50 Digital Recording - D-3 Composite Format - Table of contents Page 1 of 42 pages 2 Normative references 1 Scope 2 Normative references 3 Environment and t
2、est conditions 4 Video tape 5 Helical recording 6 Program track data 7 Video interface 8 Audio interface 9 Video processing 1 O Audio processing 11 Longitudinal tracks Annex A Tape tension Annex B Cross-tape track measurement technique Annex C Mathematically processed measured tape data Annex D Trac
3、k pattern during insert editing Annex E Bibliography 1 Scope This standard specifies the content, format, and recording method of the data blocks containing video, audio, and associated data which form the helical recods on 12.65m (0.5in)tapeincassettesasspecifiedinANSVSMPTE263M. In addition, this s
4、tandard specifies the content, format, and recording method of the longitudinal record con- taining tracking infonation for the scanning head associated with the helical records, and also the lon- gitudinal cue audio and time code tracks. One video channel and four independent audio channels are rec
5、orded in the digital format. Each of these channels is designed to be capable of independent editing.The video channel records and reproduces a composite television signal in the 625-line system with a frame frequency of 25 Hz. Figures 1 and 2 show a block diagram of the processes involved in the re
6、corder. The following standards contain provisions which, through reference in this text, constitute provisions of this standard. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition o
7、f the standards indicated below. SMPTE RP 155-1997, Audio Levels for Digital Audio Records on Digital Television Tape Recorders IEC 60461 (1986-09), Time and Control Code for Video Tape Recorders IEC 611 79 (1 993-03), Helical-Scan Digital Compos- ite Video Cassette Recording System Using 19 mm Magn
8、etic Tape, Format D2 (NTSC, PAL, PAL-M) ITU-R BC.647-2 (1994), A Digital Audio Interface for Broadcasting Studios ITU-R.470-4 (1 994), Television Systems 3 Environment and test conditions 3.1 Environment Tests and measurements made on the system to check the requirements of this standard shall be ca
9、r- ried out under the following conditions: - Temperature (20 f 1)“C - Relative humidity (50 k 2)% - Barometric pressure - Tape conditioning - Center tape tension 86 kPa to 106 kPa not less than 24 h (0.31 I 0.05) N (see annex A) Copyright Q 1998 by THE SOCIEPI OF MOTION PICTURE AND TELEVISION ENGIN
10、EERS 595 W. Hartsdale Ave., White Plailis, NY 10607 (914) 761-1100 Approved December 8,1998 STD-SMPTE 2bSH-ENGL 1998 W 8357901 0003373 258 SMPTE 265M-1998 AUDIO 4 BLOCK - ; ANALOG/ INTRA- OUTER ECC DIGITAL -.* FIELD INTERFACE SHUFFLE CODER SHUFFLE (DIGITAL) - - - VI DEO f A ANALOG/ CHANNEL OUTER INT
11、RA- DIGITAL -b DEMUX -b ECC FIELD CODER SHUFFLE INTERFACE SWITCH (DIGITAL) . . - - - - 7 DATA SYNC/ MUX ID GEN. CODER HELICAL DRIVER TRACK RECORD TIME CODE DRIVERS - - - - - - - - - - REC.AMP (ANALOG) CUEIREF Figure 1 - Record block diagram AUDIO BLOCK DESHUFFLE FIELD (ANALOG) *- DIGITAL/ AUDIO ANAL
12、OG + ERROR *- (DIGITAL) CHANNEL OUTER INTRA- ECC + FIELD DECODER DESHUFF LE 4 CONTROL TRACK TRACK P.E. y - - - - - I_ - - HEADS AND - TIME CODE 4 PLAY BACK T.C. READER - INTERFACE TIME CODE4 -I- (ANALOG) CUEIREF 4 P.B.AMP Figure 2 - Playback block diagram Page 2 of 42 pages STD-SMPTE 2bSfl-ENGL 1978
13、 I6357401 0003174 17Li M SMPTE 265M-1998 3.2 Reference tape Blank tape for reference recordings should be avail- able from any source meeting the tape characteristics specified by this standard. 3.3 Calibration tapes The calibration tapes meeting the requirements of 3.3.1 and clause 4 should be avai
14、lable from manufac- turers who produce video tape recorders and players in accordance with this Standard. 3.3.1 Record locations and dimensions evaluated by measuring the tape width at 10 points each separated by a distance of 1 O0 mm. 4.4 Reference edge straightness The reference edge straightness
15、maximum deviation is 6 pm peak to peak. Edge straightness fluctuation is measured at the edge of a moving tape guided by three guides having contact to the same edge and having a distance of 85 mm from the first to second guide and 85 mm from the second to third guide. Edge measurements are averaged
16、 over 1 O-mm lengths and are made 5 mm from the midpoint between the first and second guide, toward the first guide. The tolerances shown in table 1 shall be reduced by 50%. 4.5 Tape thickness 3.3.2 Calibration signals Two types of signals shall be recorded on the calibra- tion tape: (a) - Video: 10
17、0% color bars; - Audio: l-kHz tone at -20 dB below full level; - Cue: l-kHz tone at reference level; 10-kHz tone at reference level. (b) A signal of constant recorded frequency (i.e., one- half the Nyquist frequency) only with tracks of field O, segment O for the purpose of mechanical alignment. 4 V
18、ideo tape 4.1 Base The base material shall be polyester or equivalent. The thickness of the tape (including all coatings) shall be 10.2 pm to 11 .O pm and 13.0 pm to 14.0 pm, recpectively. 4.6 Transmissivity Transmissivity shall be less than 5%, measured over the range of wavelengths 800 nm to 900 n
19、m. 4.7 Offset yield strength The offset yield strength shall be greater than 9 N for 11 pm tape and 10 N for 14 pm tape. The force to produce 0.2% tangential elongation of a 1000-mm test sample with a pull rate of 10 mm per minute shall be used to confirm the offset yield strength. The line beginnin
20、g at 0.2% elongation parallel to the initial tangential slope is drawn and then read at the point of intersection of the line and the stress-strain curve. 4.2 Width 4.8 Magnetic coating The tape width shall be 12.650 mm rt 0.008 mm. The tape, covered with glass, is measured without tension at a mini
21、mum of five different positions along the tape using a calibrated comparator having an accuracy of 1/1000 mm = 1 pm. The tape width is defined as the average of the five readings. 4.3 Width fluctuation Tape width fluctuation shall not exceed 5 pm peak to peak. Measurement of tape width fluctuation s
22、hall be over a tape length of 900 mm at the beginning of tape winding. The value of tape width fluctuation shall be The magnetic tape used shall have a coating of metal particles or equivalent. 4.9 Coating coercivity Thecoatingcoercivityshall beaclass 1600 (1273OOAlm), with an applied field of 5000
23、Oe as measured by a 50- or WHz BH meter or vibrating sample magnetometer (VSM). 4.10 Particle orientation The metal particles shall be longitudinally oriented. Page 3 of 42 pages Table 1 - Record location and dimensions Mi II imeters Dimensions Nominal Tolerance A B C D E F G H I K L Mi M P1 P2 W XI
24、 x2 x3 x4 x5 Y 9 a0 a1 Time code track lower edge Time code track upper edge Control track lower edge Control track upper edge Program area lower edge Program area width Cue audio track lower edge Cue audio track upper edge Helical track pitch Video sector length Helical track total length Audio sec
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