1、 Table of contents 1 Scope 2 Normative references 3 Environment and test conditions 4 Video tape 5 Helical recordings 6 Program track data 7 Video interface 8 Audio data interface 9 Video processing 10 Audio data processing 11 Longitudinal track Annex A Tape tension Annex B Cross-tape track measurem
2、ent technique Annex C Track pattern during insert editing Annex D Recorder block diagram contained in this document Annex E Reference and calibration tape Annex F Tape cassette Annex G Abbreviations Annex H Bibliography 1 Scope This standard specifies the content, format, and recording method of the
3、 data blocks containing video, audio, and associated data which form the helical records on 12.65-mm (0.5-in) tape. In addition, this standard specifies the content, format, and recording method of the longitudinal record containing tracking information for the scanning head associated with the heli
4、cal records, and also the longitudinal cue audio, and time and control code tracks. One video channel and eight independent AES3 audio data channels1)are recorded in the digital format. Each of these AES3 data channels is designed to be capable of independent editing. NOTE 1 Throughout the text of t
5、his standard, the expression “AES3 audio data” shall be abbreviated to “audio data” and represents digitized audio and data in AES-3 format. The video channel records and reproduces a component television signal in the 525-line system with a frame frequency of 29.97 Hz (hereafter referred to as the
6、525/60 system) and the 625-line system with a frame frequency of 25.00 Hz (hereafter referred to as the 625/50 system). Page 1 of 83 pages SMPTE 398M-2004 Copyright 2004 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 Approved Fe
7、bruary 3, 2004 SMPTE STANDARD for Digital Video Recording 1/2-in Type D-14 Component Format 525/60 and 625/50 SMPTE 398M-2004 Page 2 of 83 pages Figures 1 and 2 show block diagrams of typical recording and playback circuits. Figure 1 Record block diagram Figure 2 Playback block diagram (ANALOGCOMPON
8、ENT)ANALOG/DIGITALINTERFACEINTRA-FIELDSHUFFLEBLOCKSHUFFLEAUDIO(ANALOG)(DIGITAL AES3)VIDEOOUTERECCENCODERANALOG/DIGITALINTERFACEHELICALTRACKRECORDDRIVERAND HEADCHANNELCODERINNERECCENCODERDATAMUXSYNC/ID GEN.CONTROL TRACKINFORMATIONCONTROL TRACKGEN.TIME ANDCONTROLCODEEXTT.C. TIME CODEGEN.CUE(ANALOG)REC
9、. AMPRECORDDRIVERSAND HEADSCHANNELDEMUXSWITCHOUTERECCENCODERINTRA-FIELDSHUFFLE(DIGITALCOMPONENT)AUDIO(ANALOG)DIGITAL/ANALOGINTERFACEINTRA-FIELDDESHUFFLE(DIGITAL AES3)AUDIOERRORCONCEALOUTERECCDECODERBLOCKDESHUFFLEVIDEODIGITAL/ANALOGINTERFACEVIDEOERRORCONCEALHELICALTRACKPLAYBACKHEADPRE AMPAND EQ.CONTR
10、OL TRACKINFORMATIONCONTROL TRACKP.B.TIME ANDCONTROL CODET.C.TIME CODEREADERCUE(ANALOG)P.B. AMPHEADS ANDPLAYBACKINTERFACESYNCDETECCHANNELDECODERINNERECCDECODERDATADEMUXINTRA-FIELDDESHUFFLECHANNELMUXSWITCHOUTERECCDECODER(ANALOGCOMPONENT)(DIGITALCOMPONENT)SMPTE 398M-2004 Page 3 of 83 pages 2 Normative
11、references The following standards contain provisions, which through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged t
12、o investigate the possibility of applying the most recent edition of the standards indicated below. ANSI/SMPTE 125M-1995, Television Component Video Signal 4:2:2 Bit-Parallel Digital Interface ANSI/SMPTE 259M-1997, Television 10-Bit 4:2:2 Component and 4fsc Composite Digital Signals Serial Digital I
13、nterface ANSI/SMPTE 272M-1994, Television Formatting AES/EBU Audio and Auxiliary Data into Digital Video Ancillary Data Space SMPTE 12M-1999, Television, Audio and Film Time and Control Code SMPTE RP 155-1997, Audio Levels for Digital Audio Records on Digital Television Tape Recorders AES3-1992 (R19
14、97), Serial Transmission Format for two Channel Linearly Represented Digital Audio Data 3 Environment and test conditions 3.1 Environment Tests and measurements made on the system to check the requirements of this standard shall be carried out under the following conditions: Temperature 20 C 1 C Rel
15、ative humidity (50 2) % Barometric pressure from 86 kPa to 106 kPa Tape conditioning not less than 24 h Center tape tension 0.31 N 0.05 N (see annex A) 4 Magnetic tape 4.1 Base The base material shall be polyester or equivalent. 4.2 Width The tape width shall be 12.650 mm 0.008 mm. The tape, covered
16、 with glass, shall be 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 is defined as the average of the five readings. 4.3 Width fluctuation Tape width fluctuation shall not exceed 5 m
17、peak to peak. Measurement of tape width fluctuation shall be taken over a tape length of 900 mm. 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. SMPTE 398M-2004 Page 4 of 83 pages 4.4 Tape thickness Two types of
18、 tape thickness shall be permitted by this standard. The first tape thickness shall be 10.2 m to 11.0 m (referred to as 11 m); the second tape thickness shall be 13.0 m to 14.0 m (referred to as 14 m). 4.5 Transmissivity Transmissivity shall be less than 5%, measured over the range of wavelengths 80
19、0 nm to 900 nm. 4.6 Offset yield strength The offset yield strength shall be greater than 9 N for 11-m tape and 10 N for 14-m tape. The force to produce 0.2 % elongation of a 1000-mm test sample with a pull rate of a 10-mm per minute shall be used to confirm the offset yield strength. The line begin
20、ning 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. 4.7 Magnetic coating The magnetic layer of the tape shall consist of a coating of metal particles or equivalent. 4.8 Coating coercivity The c
21、oating coercivity shall be a class 1800 (144000 A/m) with an applied field of 400000 A/m (5000 Oe) as measured by a 50-Hz or 60-Hz B-H meter or vibrating sample magnetometer (VSM). 4.9 Particle orientation The metal particles shall be longitudinally oriented. 5 Helical recordings 5.1 Tape speed The
22、tape speed shall be 167.228 mm/s (525/60 system) and 185.995 mm/s (625/50 system). The tolerance shall be 0.2 %. 5.2 Record location and dimensions 5.2.1 The format requires a full track width erasure for continuous recording and a flying erasure for insert editing. 5.2.2 Record location and dimensi
23、ons for continuous recording shall be as specified in figures 3 and 4 and tables 1 (525/60 system) and 2 (625/50 system). In recording, sector locations on each helical track shall be contained within the tolerances specified in figure 3 and tables 1 (525/60 system) and 2 (625/50 system). 5.2.3 The
24、reference edge of the tape for dimensions specified in this standard shall be the lower edge as shown in figure 3. The magnetic coating, with the direction of tape travel as shown in figure 3, is on the side facing the observer (measuring techniques are shown in annex B). 5.2.4 As indicated in figur
25、e 3, this standard anticipates a zero guard band between recorded tracks, and the record head width should be equivalent to the track pitch of 20 m. The scanner head configuration should be chosen such that the recorded track widths are contained within the limits of 18 m to 22 m. SMPTE 398M-2004 Pa
26、ge 5 of 83 pages 5.2.5 In insert editing, this standard provides a guard band of 2 m (nominal) between the previously recorded track and the inserted track at editing points only. A typical track pattern for insert editing is shown in figure C.1 of annex C. NOTES 1 A1 to A8 are audio data sectors. 2
27、 V0 and V1 are video sectors. 3 Tape viewed from magnetic coating side. 4 Dimensions X1 to X10 are determined by the program reference point as defined in figure 4. Figure 3 Location and dimensions* of recorded tracks (See tables 1 and 2) Detail Aa0a1a1a0Reference edgeTime and Control Code TrackCont
28、rol TrackCue TrackDirection of tape travelDirection ofheadmotionX1X2X3X4X5X6K0V0A1A2V1K1MDetail ALIYAB CDEFGHWMMMMMMMARASATAUAVAWXXXWXVXPOP1P2Time Code Start BitVideo FramePulseSMPTE 398M-2004 Page 6 of 83 pages Figure 4 Location of cue and time and control code track records SERVOREFERENCEPULSERECO
29、RDING-CURRENTWAVEFORMSNNSDETAIL ARECORDING-CURRENTWAVEFORMDETAIL BPROGRAM REFERENCEPOINTVIDEOSECTORPREAMBLECONTROLTRACKTIME AND CONTROL CODE TRACKREFERENCE EDGEY (BASIC)X1DETAIL CDETAIL ATAPETRAVELCONTROL TRACKCUE TRACKTIME AND CONTROL CODE TRACKHEAD MOTIONDETAIL BP1P2PROGRAMREFERENCE POINTX1LOCATIO
30、N OFVIDEO STARTYDETAIL CSMPTE 398M-2004 Page 7 of 83 pages Table 1 Record location and dimensions (525/60 system) Dimensions Nominal Tolerance A B C D E F G H I K0 K1 L M P1 P2 X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 Y Time and control code track lower edge Time and control code track upper edge Control trac
31、k 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 0 length Video sector 1 length Helical track total length Audio data sector length Control track reference pulse to program referenc
32、e point (see figure 4) Cue/time and control code signal, start of code word, to program reference point (see figure 4) Location of start of video sector V0 Location of start of audio data sector A1 Location of start of audio data sector A2 Location of start of audio data sector A3 Location of start
33、of audio data sector A4 Location of start of audio data sector A5 Location of start of audio data sector A6 Location of start of audio data sector A7 Location of start of audio data sector A8 Location of start of video sector V1 Program reference point 0 0.450 0.900 1.300 1.629 10.020 11.950 12.550
34、0.0200 51.624 51.562 116.397 1.273 180.556 183.407 0 51.898 53.507 55.117 56.726 58.335 59.944 61.554 63.163 64.772 1.639 Basic 0.050 0.050 0.050 Derived Derived 0.050 0.050 Ref Derived Derived Derived Derived 0.050 0.100 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 Basic a0 a1 Track
35、angle Azimuth angle (track 0) Azimuth angle (track 1) 4.9384 - 20.038 19.962 Basic 0.150 0.150 NOTES 1 Measurements shall be made under the conditions specified in 3.1. The measurements shall be corrected to account for actual tape speed (see figures B.1 and B.2). 2 All dimensions in millimeters. SM
36、PTE 398M-2004 Page 8 of 83 pages Table 2 Record location and dimensions (625/50 system) Dimensions Nominal Tolerance A B C D E F G H I K0 K1 L M P1 P2 X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 Y Time and control code track lower edge Time and control code track upper edge Control track lower edge Control track
37、 upper edge Program area lower edge Program area width Cue audio track lower edge Cue audio track upper edge Helical track pitch Video sector 0 length Video sector 1 length Helical track total length Audio data sector length Control track reference pulse to program reference point (see figure 4) Cue
38、/time and control code signal, start of code word, to program reference point (see figure 4) Location of start of video sector V0 Location of start of audio data sector A1 Location of start of audio data sector A2 Location of start of audio data sector A3 Location of start of audio data sector A4 Lo
39、cation of start of audio data sector A5 Location of start of audio data sector A6 Location of start of audio data sector A7 Location of start of audio data sector A8 Location of start of video sector V1 Program reference point 0 0.450 0.900 1.300 1.745 9.911 11.950 12.550 0.0200 52.104 52.034 115.13
40、1 1.089 179.277 182.666 0 52.228 53.631 54.973 56.315 57.658 59.000 60.342 61.685 63.027 1.756 Basic 0.050 0.050 0.050 Derived Derived 0.050 0.050 Ref Derived Derived Derived Derived 0.050 0.100 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 0.050 Basic a0 a1 Track angle Azimuth angle (track
41、0) Azimuth angle (track 1) 4.9384 - 20.038 19.962 Basic 0.150 0.150 NOTES 1 Measurements shall be made under the conditions specified in 3.1. The measurements shall be corrected to account for actual tape speed (see figures B.1 and B.2). 2 All dimensions in millimeters. SMPTE 398M-2004 Page 9 of 83
42、pages 5.3 Helical track record tolerance zones The lower edges of any eight consecutive tracks starting at the first track in each video frame shall be contained within the pattern of the eight tolerance zones established in figure 5. Each zone is defined by two parallel lines, which are inclined at
43、 an angle of 4.9384 (basic) with respect to the tape reference edge. The centerlines of all zones shall be spaced apart 0.0200 mm (basic). The width of zones 1 to 3 and 5 to 8 shall be 0.006 mm (basic). The width of zone 4 shall be 0.004 mm (basic). These zones are established to contain track angle
44、 errors, track straightness errors, and vertical head offset tolerance (measuring technique is shown in annex B). 5.4 Relative positions of recorded information 5.4.1 Relative positions of longitudinal tracks Audio data, Video, control track, time and control code, and cue track with information int
45、ended to be time coincident shall be positioned as shown in figures 3 and 4. 5.4.2 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 Y from the reference edge and the centerline of the fi
46、rst track in each video field (segment 0, track 0). (See figures 3 and 4.) The end of the preamble and start of the video sector shall be recorded at the program area reference point, and the tolerance is dimension X1. The locations are shown in figures 3 and 4; dimensions X1 and Y are in tables 1 a
47、nd 2. The relationship between sectors and contents of each sector is specified in clause 6. 5.5 Gap azimuth 5.5.1 Cue track, control track, time code track The azimuth angle of the cue, control track, and time and control code head gaps used to produce longitudinal track records shall be perpendicu
48、lar to the track record. 5.5.2 Helical track The azimuth of the head gaps used for the helical track shall be inclined at angles a0and a1as specified in tables 1 and 2, with respect to a line perpendicular to the helical track. The azimuth of the first track of every field (segment 0, track 0) shall
49、 be oriented in the counterclockwise direction with respect to a line perpendicular to the helical track direction when viewed from the side of the tape containing the magnetic record. 5.6 Transport and scanner (informative) The effective drum diameter, tape tension, helix angle, and tape speed taken together determine the track angle. Different methods of design and/or variations in drum diameter and tape
