1、 Table of contents 1 Scope 2 Normative reference 3 Environment and test conditions 4 Tape 5 Helical recordings 6 Program track 7 Audio 8 Video processing 9 Subcode processing 10 Longitudinal tracks 11 Interface Annex A Tape tension Annex B Track pattern during insert editing Annex C Cross-tape track
2、 measurement technique Annex D Frequency characteristics of F0track Annex E Digital filter for sampling-rate conversion from 4:2:2 to 4:1:1 color-difference signals Annex F Relationship between tape length and recording time for M, L, and EL cassettes Annex G Bibliography Abbreviations and Acronyms
3、AAUX Audio auxiliary data AP1 Audio application ID AP2 Video application ID AP3 Subcode application ID APT Track application ID Arb Arbitrary AS AAUX source pack ASC AAUX source control pack B/W Black and white flag CGMS Copy generation management system DBN DIF block number DCT Discrete cosine tran
4、sform DIF Digital interface DSF DIF sequence flag ECC Error correction code Page 1 of 131 pages SMPTE 306M-2002 Revision of SMPTE 306M-1998 Copyright 2002 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 NOTE: Figures 63 and 64 Co
5、rrected September 30, 2002 Approved March 15, 2002 SMPTE STANDARD for Television 6.35-mm Type D-7 Component Format Video Compression at 25 Mb/s and 50 Mb/s 525/60 and 625/50 SMPTE 306M-2002 Page 2 of 131 pages EFC Emphasis channel flag EOB End of block ID Identification IDP ID parity ITI Insert and
6、track information LF Locked mode flag PF Pilot frame QNO Quantization number QU Quantization Res Reserved for future use SMP Sampling frequency SSA Start sync area SSYB Subcode sync block number STA Status of the compressed macro block Syb Sync block number TF Transmitting flag TIA Track information
7、 area Trp Track pair number VAUX Video auxiliary data VLC Variable length coding VS VAUX source pack VSC VAUX source control pack VSM Vibrating sample magnetometer 1 Scope This standard specifies the content, format and recording method of the data blocks containing video, audio, and associated data
8、 which form the helical records on 6.35-mm tape contained in cassettes as specified in SMPTE 307M. In addition, this standard specifies the content, format, and recording method for longitudinal cue and control tracks. One video channel and two independent audio channels are recorded in the digital
9、format for 25 Mb/s VTRs and one video channel and four independent audio channels for 50 Mb/s VTRs. Each of these channels is designed to be capable of independent editing. The video channel records and reproduces a component television signal in the 525-line system with a frame frequency of 29.97 H
10、z (hereinafter referred to as the 525/60 system) and the 625-line system with a frame frequency of 25.00 Hz (hereinafter referred to as the 625/50 system). Prior to recording, the digital signal shall be compressed to a DV-based 25 Mb/s bit stream with 4:1:1 sampling or a DV-based 50 Mb/s bit stream
11、 with 4:2:2 sampling. The standard includes the process required to decode the DV-based 25 Mb/s bit stream and 50 Mb/s bit stream into output video, audio, and data. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this
12、standard. At the time of publication, the edition indicated was valid. 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 of the standard indicated below. SMPTE 306M-2002 Page 3 of
13、131 pages AES3-1992, Serial Transmission Format for Two-Channel Linearly Represented Digital Audio Data ANSI/SMPTE 12M-1999, Television, Audio and Film Time and Control Code SMPTE 307M-2002, Television Digital Recording 6.35-mm Type D-7 and Type D-12 Component Format Tape Cassette SMPTE 314M-1999, T
14、elevision Data Structure for DV-Based Audio, Data and Compressed Video 25 and 50 Mb/s see note 1 SMPTE 321M-2002, Television Data Stream Format for the Exchange of DV-Based Audio, Data and Compressed Video over a Serial Data Transport Interface see note 2 ITU BT.601-5, Studio Encoding Parameters of
15、Digital Television for Standard 4:3 and Wide-Screen 16:9 Aspect Ratios NOTES 1 Contents of this document related to compression are the same as in the referred document. 2 If equipment conforming to this standard includes a serial digital interface based on SMPTE 305.2M (SDTI), such an interface sha
16、ll conform to SMPTE 321M. The presence of such an interface is optional. Barometric pressure: From 86 kPa to 106 kPa Tape conditioning: Not less than 24 h Center tape tension: 0.09 N 0.02 N (see annex A) 3 Environment and test conditions 3.1 Environment Tests and measurements made on the system to c
17、heck the requirements of this standard shall be carried out under the following conditions: Temperature: 20C 1C Relative humidity: (50 2)% 3.2 Reference tape A blank tape for reference recordings shall be available from the format holder or approved source. 3.3 Calibration tapes The calibration tape
18、s meeting the requirements of clauses 3.3.1, 3.3.2, and 4 shall be made available from manufacturers who produce digital television tape recorders and players in accordance with this standard. 3.3.1 Record locations and dimensions Calibration tape shall be manufactured to tolerances shown in table 1
19、 or table 2 for 25 Mb/s format or table 3 or table 4 for 50 Mb/s format but with these tolerance reduced by 50%. 3.3.2 Calibration signals Two sets of signals shall be recorded on the calibration tape: SMPTE 306M-2002 Page 4 of 131 pages a) Video: 100 / 0 / 100 / 0 color bars Audio: 1 kHz tone at 20
20、 dB below full scale on each audio channel Cue: 1 kHz and 6-kHz tone at the analog recording reference level b) A signal of constant recorded frequency (i.e., the Nyquist frequency) for the purpose of mechanical alignment. Recording level shall conform to 6.1.4.3 4 Tape 4.1 Base The base material sh
21、all be polyester or equivalent. 4.2 Width The tape width shall be 6.350 mm 0.005 mm. The tape, covered with glass, is measured without tension at a minimum of five different positions along the tape using a calibrated comparator having an accuracy of 0.001 mm (1 m). The tape width shall be within th
22、e aforementioned specification at any measuring position. 4.3 Width fluctuation Tape width fluctuation shall not exceed 5 m peak-to-peak. Measurement of tape width fluctuation shall be taken over a tape length of 900 mm. The tape width fluctuation shall be within the aforementioned specification at
23、each of ten equally spaced points in the 900-mm span. 4.4 Reference edge straightness The reference edge straightness maximum deviation is 6 m peak-to-peak. Edge straightness fluctuation is measured at the edge of a moving tape guided by three guides having contact on the same edge and having a dist
24、ance of 85 mm from the first to second guide and 85 mm from the second to third guide. Edge measurements are averaged over a 10 m length and are made 5 mm from the midpoint between the first and second guide towards the first guide. 4.5 Tape thickness The total tape thickness shall be 8.8 m + 0.0 m
25、- 0.8 m and 6.7 m + 0.0 m - 0.4 m. NOTE Tape of either thickness may be used for 25 Mb/s or 50 Mb/s formats. 4.6 Transmissivity Transmissivity shall be less than 5 %, measured over the range of wavelengths 800 nm to 1000 nm. 4.7 Offset yield strength The offset yield strength shall be greater than 3
26、 N. The force to produce 0.2 % 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 beginning at 0.2 % elongation parallel to the initial tangential slope is drawn and then read at the point of intersection of the line
27、and the stress-strain curve. SMPTE 306M-2002 Page 5 of 131 pages 4.8 Magnetic coating The magnetic layer of the tape shall consist of a coating of metal particles or equivalent. 4.9 Coating coercivity The magnetic coating coercivity shall be a class 2300 (approximately 2300 Oe / 184000 A/m), with an
28、 applied field of 10000 Oe / 800000 A/m measured by a VSM. 5 Helical recordings 5.1 Tape speed The tape speed for the 25 Mb/s format shall be 33.8201 mm/s for the 525/60 system and 33.8539 mm/s for the 625/50 system. The tape speed for the 50 Mb/s format shall be 67.6401 mm/s for the 525/60 system a
29、nd 67.7077 mm/s for the 625/50 system. The tolerance shall be 0.2 % respectively. 5.2 Sectors Each recorded track contains an ITI sector, an audio sector, a video sector and a subcode sector. 5.3 Record locations and dimensions 5.3.1 Record locations and dimensions for continuous recording of 25 Mb/
30、s format shall be as specified in figures 1 and 3, and table 1 (525/60 system) or in figures 1 and 3, and table 2 (625/50 system). In recording, sector locations on each helical track shall be contained within the tolerance specified in figure 1 and table 1 (525/60 system) or in figure 1 and table 2
31、(625/50 system). Record location and dimensions for continuous recording of 50 Mb/s format shall be as specified in figures 2 and 3, and table 3 (525/60 system) or in figures 2 and 3, and table 4 (625/50 system). In recording, sector locations on each helical track shall be contained within the tole
32、rance specified in figure 2 and table 3 (525/60 system) or in figure 2 and table 4 (625/50 system). 5.3.2 The reference edge of the tape for dimensions specified in this standard shall be the lower edge as shown in figures 1 and 2. The magnetic coating, with the direction of tape travel as shown in
33、figures 1 and 2, are on the side facing the observer. 5.3.3 As indicated in figures 1 and 2, this standard anticipates a zero guard band between recorded tracks, and the nominal record head width shall be equal to the track pitch of 18 m. The scanner head configuration should be chosen such that the
34、 recorded track widths are contained within the limits of 16 m to 20 m. 5.3.4 The format requires flying erasure for recording. In insert editing, this standard provides a guard band of 3 m 1.5 m between the previously recorded track and the inserted track at editing points only. A typical track pat
35、tern for insert editing is shown in figures B.1 and B.2 of annex B. 5.4 Helical track record tolerance zones In the case of 25 Mb/s format, the center of two consecutive tracks starting at the first track in each video frame shall be contained within the pattern of the two tolerance zones establishe
36、d in figure 4. Each zone is defined by two parallel lines which are inclined at an angle of 9.1784 basic with respect to the tape reference edge. The centerlines of each zone shall be spaced apart 18.0 m basic. The width of zone 1 shall be 3 m and the width of zone 2 shall be 5 m. These zones are es
37、tablished to contain track angle errors, track straightness errors, and vertical head offset tolerance (the measuring technique is shown in annex C). SMPTE 306M-2002 Page 6 of 131 pages In the case of 50 Mb/s format, the lower edge of four consecutive tracks starting at the first track in each video
38、 frame shall be contained within the pattern of the four tolerance zones established in figure 5. Each zone is defined by two parallel lines which are inclined at an angle of 9.1784 basic with respect to the tape reference edge. The centerlines of each zone shall be spaced apart 18.0 m basic. The wi
39、dth of zone 2 shall be 3 m and the width of zone 1, 3 and 4 shall be 5 m. These zones are established to contain track angle errors, track straightness errors, and vertical head offset tolerance. 5.5 Relative positions of recorded information 5.5.1 Relative positions of longitudinal tracks Audio, vi
40、deo, control track and cue track with information intended to be time coincident shall be positioned as shown in figures 1 to 3. 5.5.2 Program area reference point The program area reference point is determined by the intersection of a line parallel to the reference edge of the tape at a distance Y0
41、from the reference edge and the centerline of track 0 in each ITI sector (see figures 1 to 3). The end of the preamble and beginning of SSA in the ITI sector shall be recorded at the program area reference point, and the tolerance of dimension X0. The locations are shown in figures 1 to 3; dimension
42、s X0and Y0are specified in tables 1 to 4. The relationship between sectors and contents of each sector is specified in clause 6. SMPTE 306M-2002 Page 7 of 131 pages M3M2M1XhM4Detail R 0 1A BEControl trackReference edgeY0X0X1X2X3RLIDirection of tape travelDirection of head motionCue trackFGWT1T0Figur
43、e 1 Locations and dimensions of recorded tracks of 25 Mb/s format SMPTE 306M-2002 Page 8 of 131 pages Detail R 0 1A BEControl trackReference edgeY0X0X1X2X3RLIDirection of tape travelDirection of head motionCue trackFGWT1T0M3M2M1XhM4T3T2Figure 2 Locations and dimensions of recorded tracks of 50 Mb/s
44、format SMPTE 306M-2002 Page 9 of 131 pages Magnetizationon the tapeDetail ANSSNRecording currentwaveformServoreferencepulseDirection oftape travelAY0ControltrackDirection ofhead motionBCuetrackP1P2Detail CBeginning of SSA in ITIProgramreference pointY0X0Detail BControl trackReference edgepreambleCX0
45、ITIsectorProgram referencepointY0(BASIC)Figure 3 Location of cue and control track record SMPTE 306M-2002 Page 10 of 131 pages Table 1 - Record locations and dimensions (525/60 system of 25 Mb/s format) Dimensions imilmetrs NOTE Measurements shall be made under the conditions specified in 3.1. The m
46、easurements shall be corrected to account for actual tape speed (see figures C.1 and C.2) Table 2 - Record locations and dimensions (625/50 system of 25 Mb/s format) Dimensions imilmetrs NOTE Measurements shall be made under the conditions specified in 3.1. The measurements shall be corrected to acc
47、ount for actual tape speed (see figure C.1 and C.2). Dimensions Nominal Tolerance A B E F G I L M1M2M3M4P1P2W X0X1X2X3Xh Y0Control track lower edge Control track upper edge Program area lower edge Program area width Cue track lower edge Helical track pitch Total length of helical track Length of ITI
48、 sector with preamble and post-amble Length of audio sector with preamble and post-amble Length of video sector with preamble and post-amble Length of subcode sector with preamble and post-amble Control track reference pulse to program reference point (see figure 3) Cue signal, start of code word of
49、 cue to program reference point (see figure 3) Tape width Location of beginning of SSA in ITI sector Location of start of audio data sync blocks Location of start of video data sync blocks Location of start of subcode data sync blocks Head stagger and inline tolerance Program track reference point 0 0.400 0.56 5.24 6.000 0.018 32.842 0.876 2.810 27.548 0.906 67.500 69.900 6.350 0 0.809 3.790 31.885 0.111 0.615 Basic 0.050 Derived Derived 0.050 Ref.
