ANSI SMPTE ST 264M-1998 Television Digital Recording - 1 2-in Type D-3 Composite Format - 525 60.pdf
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1、SMPTE STANDARD for Television 1/2-in Type 525/60 SMPTE 264M-1998 Revision of ANCVCMPTE 264M-1993 Table of contents 1 2 3 4 5 6 7 9 10 11 a Scope Normative references Environment and test conditions Video tape Helical recording Program track data Video interface Audio interface Video processing Audio
2、 processing Longitudinal track Annex A Tape tension Annex B Cross-tape track measurement technique Annex C Mathematically processed measured tapedata Annex D Track pattern during insert editing Annex E Bibliography 1 Scope This standard specifies the content, format, and recording method of the data
3、 blocks containing video, audio, and associated data which form the helical records on 12.65-mm (0.5-in) tape in cassettes as specified in ANSI/SMPTE 263M. In addition, this standard specifies the content, for- mat, and recording method of the longitudinal record containing tracking information for
4、the scan- ning head associated with the helical records, and also the longitudinal cue audio and time code tracks. One video channel and four independent audio channels are recorded in the digital format. Each of these chan- nels is designed to be capable of independent editing. Page 1 of 42 pages T
5、he video channel records and reproduces a compos- ite television signal in the 525-line system with a frame frequency of 29.97 Hz. Figures 1 and 2 show a block diagram of the proc- esses involved in the recorder. 2 Normative references The following standards contain provisions which, through refere
6、nce in this text, constitute provisions of this standard. Ail 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 of the standards indicated below. ANSI/SMPTE 244M-1995, Television - Syst
7、em M/NTSC Composite Video Signals - Bit-Parallel Digital Interface SMPTE RP 155-1 997, Audio Levels for Digital Audio Records on Digital Television Tape Recorders IEC 60461 (1986-09), Time and Control Code for Video Tape Recorders ITU-R BS. 647-2 (1994), A Digital Audio Interface for Broadcasting St
8、udios ITU-R BT.470-4 (1 994), Television Systems Copyright Q 1998 by THE SOCIETY OF MOTION PICTURE ANDTELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 Approved December 8, 1998 STD-SMPTE 2b4M-ENGL 1998 a 8357401 0003131 BT9 SMPTE 264M-1998 - DIGITAL/ VIDEO CHANNEL +-
9、 INTERFACE CONCEAL SWITCH ANALOG t ERROR MUX +- Figure 1 - Record block diagram OUTER INTRA- ECC +- FIELD DECODER DESHUFFLE AUDIO 4 BLOCK DESHUFFLE OUTER (ANALOG) DIGITAL/ AUDIO INTRA- ANALOG +- ERROR t FIELD 4 INTERFACE CONCEAL IXWUFFLE i (DIGITAL) CONTROL TRACK TRACK P.B. I -_- - HEADS AND PLAYBAC
10、K (ANALOG) P.B.AMP TIME CODE _-_-_- -a - CUE/REF Figure 2 - Playback block diagram Page 2 of 42 pages STD-SMPTE 2bLifl-ENGL 1798 8357401 0003132 735 SMPTE 264M-1998 3 Environment and test conditions 3.1 Environment Tests and measurements made on the system to check the requirements of this standard
11、shall be car- ried out under the following conditions: - Temperature (20 I 1)OC - Relative humidity - Barometric pressure - Tape conditioning - Center tape tension (50 - Audio: 1 kHz-tone at -20 dB below full level; - Cue: 1 -kHz tone at reference level; 1 O-kHz tone at reference level. (b) Asigna1
12、of constant recorded frequency (.e., one- half the Nyquist frequency) only with tracks of field O, segment O for the purpose of mechanical alignment. 4 Videotape 4.1 Base The base material shall be polyester or equivalent. 4.2 Width The tape width shall be 12.650 mm $r 0.008 mm. The tape, covered wi
13、th glass, is measured without tension at a minimum 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-t
14、o- peak. Measurement of tape width fluctuation shall be over a tape length of 900 mm at the beginning of tape winding. The value of tape width fluctuation shall be evaluated by measuring the tape width at 10 points each separated by a distance of 100 mm. 4.4 Reference edge straightness The reference
15、 edge straightness 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 measur
16、ements are averaged over 1 O-mm lengths and are made 5 mm from the midpoint be- tween the first and second guide, toward the first guide. 4.5 Tape thickness The thickness of the tape (including all coatings) shall be 10.2 pm to 11.0 pm and 13.0 pm to 14.0 pm, respectively 4.6 Transmissivity Transmis
17、sivity shall be less than 5%, measured over the range of wavelengths 800 nm to 900 nm. 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 1
18、O mm per minute shall be used to confirm the offset yield strength. The line beginning 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. Page 3 of 42 pages - - STDSMPTE 2b4M-ENGL L77 835740L 000333
19、3 b7L H SMPTE 2641111-1998 Table 1 - Record location and dimensions Mi I I i meters - Dimensions Nominal A B C D E F G H I K L Mi M Pl P2 W xi x2 x3 x4 x5 Y e ao a1 Time code track lower edge Time code track upper edge Control track lower edge Control track upper edge Program area lower edge Program
20、 area width Cue audio track lower edge Cue audio track upper edge Helical track pitch Video sector length Helical track total length Audio sector 1 length ) Audio sector 2-4 length 2, Control reference pulse to program reference point (see figure 22) Cuehime code signal (bit No. O) to program refere
21、nce point Tape width Location of start of video sector Location of start of audio sector A4 3, Location of start of audio sector A2 3, Location of start of audio sector A3 3, Location of start of audio sector AI 3, Program area reference Track angle 4.91 92“ basic Azimuth angle (track O) -20.01 9“ *
22、 0.1 50“ Azimuth anale (track 1) 19.9810 f 0.1500 O 0.450 0.900 1.300 1.567 10.090 11.950 12.550 0.0200 107.095 1 17.667 2.266 2.185 176.000 177.430 12.650 O 110.155 107.533 2.623 5.245 2.030 Tolerance Basic * 0.050 f 0.050 * 0.050 Derived Derived * 0.050 f 0.050 Ref Derived Derived Derived Derived
23、10.050 f 0.100 f 0.008 10.050 f 0.050 I 0.050 f 0.050 f 0.050 Basic -. ) Audio sectors located at the start of helical tracks. *) All other audio sectors. 3, Audio channel numbers vary (see 10.9). NOTE - Measurements shall be made under the conditions specified in 3.1. The measurements shall be corr
24、ected to account for actual tape speed (see figures B.l and B.2). 4.8 Magnetic coating 4.10 Particle orientation The magnetic tape used shall have a coating of metal particles or equivalent. The metal particles shall be longitudinally oriented. 4.9 Coating coercivity 5 Helical recording The coating
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