1、Page 1 of 91 pages Table of contents 1 Scope 2 Normative references 3 Glossary and acronyms 4 Environment and test conditions 5 Tape and cassette physical specifications 6 Tape record physical parameters 7 Longitudinal track signal and magnetic parameters 8 Source picture and audio processing 9 Heli
2、cal track signal parameters and magnetization Annex A Digital interfaces Annex B Tape transport and scanner Annex C Compatibility with the other digital formats using type L derivative cassettes Annex D Bibliography 1 Scope This standard specifies the track content, format, and recording method of t
3、he data blocks containing compressed video, AES3 audio data, and associated data which form the helical records on 12.65-mm tape in cassettes. This standard supports recording of source picture formats using 1920x1080 pixels with the 4:4:4 and 4:2:2 sampling structure specified in SMPTE 274M at the
4、frame rate of 23.98 Hz, 24 Hz, 25 Hz, and 29.97 Hz, and using 1280x720 pixels with the 4:2:2 sampling structure specified in SMPTE 296M at the frame rates of 50 Hz and 59.94 Hz (see note). This standard also supports recording of 12 channels of AES3 audio data and 3 lines of uncompressed blanking in
5、terval data. This standard includes packetizing and shuffling operations supporting picture compression using the DCT and DPCM encoding methods defined by ISO/IEC 14496-2 (MPEG-4 simple studio profile). NOTE - Early implementations of this standard might not comply to the frame rate of 50Hz as speci
6、fied in SMPTE 296M. 2 Normative 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 o
7、n this standard are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. Approved February 15,2005 Copyright O 2005 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdcde Ave., White Plains, NY 10607 (914) 761-1100 SMPTE
8、409M-2005 ANSVSMPTE 276M-1995, Television - Transmission of AES/EBU Digital Audio Signals Over Coaxial Cable ANSVSMPTE 299M-1997, Television - 24-Bit Digital Audio Format for HDTV Bit-Serial Interface SMPTE 12M-1999, Television, Audio and Film -Time and Control Code SMPTE 274M-2005, Television - 192
9、0x1 080 Image Sample Structure, Digital Representation and Digital Timing Reference Sequences for Multiple Picture Rates SMPTE 292M-1998, Television - Bit-Serial Digital Interface for High-Definition Television Systems SMPTE 296M-2001, Television - 1280x720 Progressive Image Sample Structure - Analo
10、g and Digital Representation and Analog Interface SMPTE 372M-2002, Television - Dual Link 292M Interface for 1920 x 1080 Picture Raster SMPTE RP 188-1999, Transmission of Time Code and Control Code in the Ancillary Data Space of a Digital Television Data Stream AES3-2003, Digital Audio Engineering -
11、 Serial Transmission Format for Two-Channel Linearly Represented Digital Audio Data IEC 61213 (1993-1 I), Analogue Audio Recording on Video Tape - Polarity of Magnetization IEC 61 237-1 (1 994-06), Broadcast Video Tape Recorders - Methods of Measurement - Part 1 : Mechanical Measurements ISO/IEC 144
12、96-2 (2004-06), Information Technology - Coding of Audio-Visual Objects - Part 2: Visual 3 Glossary and acronyms For the purposes of this standard, the following definitions apply. 23.98, 29.97, 59.94: When used as values of field or frame rates, exact values are respectively: 24/1.001, 30/1.001, 60
13、/1.001. alternate-scan: A I-bit flag, fixed to 1 in this format, defined in ISO/IEC 14496-2. AUX: Auxiliary basic block: The basic packing unit, comprising 4 block identifier (BID) bytes and 226 payload bytes containing auxiliary or compressed picture data. BID: Block identifier bytes in each basic
14、block, BID0 to BID3. bits-per-pixel: A 4-bit integer, fixed to IO in this format, defined in ISO/IEC 14496-2. block-mean: A IO-bit unsigned integer, defined for DPCM encoding in ISO/IEC 14496-2. chroma-format: A I-bit value indicating YC that is track O of segment O. The program reference point defi
15、nes the start of the first video sector in the record unit. The physical locations and dimensions of the helical recordings on the tape and their relative positions in regard to the time code start bit and the reference edge shall be as specified in figure 27 and table 2. 6.3.2 Helical track record
16、tolerance zones The lower edges of all eight consecutive tracks shall be contained within the pattern of the eight tolerance zones defined in figure 28. Each zone is defined by two parallel lines which are inclined at an angle of 4.63066 degrees with respect to the tape reference edge. Page 25 of 91
17、 pages SMPTE 409M-2005 The center lines of all zones shall be spaced apart by 0.0132 mm. The width of zones 2, 3, 4, 5, 6, 7, and 8 shall be 0.005 mm. The width of zone 1 shall be 0.003 mm. These zones are established to contain track angle errors, track straightness errors and vertical head offset
18、tolerance. The measuring techniques shall be as shown in IEC 61237-1 section 7. 6.3.3 Helical track gap azimuth The azimuth angle of the head gaps used for recording the helical tracks shall be at an angle of ao or al to the line perpendicular to the helical tracks, as specified in figure 27 and tab
19、le 2. The azimuth of the first track of every record unit, that is the program reference point, shall be orientated in the counterclockwise direction with respect to the line perpendicular to the track direction when viewed from the side of the tape carrying the magnetic recording. 6.4 Longitudinal
20、record physical parameters 6.4.1 Longitudinal record location and dimensions The track widths and tolerances of the control and time code tracks shall be as defined in figure 27 and table 2. 6.4.2 Longitudinal track gap azimuth The azimuth angle of the head gaps used for recording the longitudinal t
21、racks shall be perpendicular to the tracks. Page 26 of 91 pages SMPTE 409M-2005 Table 2 - Record location and dimensions Dimensions A B C D E F I J KI K2 L M N PI P2 XI x2 x3 x4 x5 X6 x7 X8 x9 XI o XI 1 Y Time code track lower edge Time code track upper edge Control track lower edge Control track up
22、per edge Program area lower edge Program area upper edge Helical track pitch (+ I - azimuth) Helical track pitch (+ I + azimuth) Video sector 1 length Video sector 2 length Helical track total length Audio sector length Tracking data area length Control track ref. To program ref. TC start bit to pro
23、gram ref. Location of start of video sector O Location of start of video sector 1 Location of start of Audio sector O Location of start of Audio sector 1 Location of start of Audio sector 2 Location of start of Audio sector 3 Location of start of Audio sector 4 Location of start of Audio sector 5 Lo
24、cation of start of Audio sector 6 Location of start of Audio sector 7 Location of start of tracking data Program area reference W Tape width Dimensions e Track angle al a2 Azimuth angle of track O Azimuth angle of track 1 Dimensions in mm Nominal Tolerance O Basic 0.4 I0.065 0.7 I0.065 1 .I I0.065 1
25、.603 Derived 11.458 Derived 0.01 32 Ref. 0.0264 Ref. 55.042 Derived 54.894 Derived 121.416 Derived 1.107 Derived 0.695 Derived 50.374 IO. 1 175.624 10.2 O IO. 07 66.374 I0.07 56.486 I0.07 57.71 6 I0.07 58.947 I0.07 60.177 I0.07 61.408 I0.07 62.638 I0.07 63.869 I0.07 65.099 I0.07 55.037 I0.07 1.633 B
26、asic 12.65 IO.01 Angles (O) Nominal Tolerance 4.630663 Basic -25.0237 IO. 17 24.9763 IO. 17 NOTE - The above measurement shall be made under the condition specified in section 4. Page 27 of 91 pages SMPTE 409M-2005 A , h% A - Direction of tape travel WY /G /R NOTE - Not to scale. Figure 27 - Locatio
27、ns and dimensions of recorded tracks Page 28 of 91 pages SMPTE 409M-2005 Figure 28 - Locations and dimensions of tolerance zones of helical track records Page 29 of 91 pages SMPTE 409M-2005 Record unit rate 23.98 Hz 24 Hz 25 Hz 29.97 Hz 7 Longitudinal track signal and magnetic parameters Control tra
28、ck pulse period 20.854 rns f 6 ps 20.833 rns f 6 ps 20.000 rns f 6 ps 16.683 rns f 6 ps 7.1 Longitudinal track record parameters 7.1.1 Method of recording The control track and time code track signals shall be recorded using the hysteretic (non-bias) recording method. 7.1.2 Flux level The recording
29、level shall be at saturation of the magnetic domains which is defined as that point above which 0.5 dB increase in output level results from 1 dB increase of input level as indicated on an r.m.s. level meter. 7.2 Control track record parameters 7.2.1 Control track pulse period The control track puls
30、e, at the point of recording, shall be a series of pulses as shown in figure 29. The period of the pulses for each record unit rate shall be as defined in table 3. 7.2.2 Control track pulse definition The rising edge of all control track pulses should be timed to coincide with the input reference si
31、gnal. The frame start point is defined as the midway point of the leading sync edge position which identifies the start of line 1 of the video signal represented by the input reference signal. The control track pulses shall have nominal periods of 35T, 50T, or 65T between the rising and falling edge
32、s where T is equal to 0.1668 ms (for 29.97-Hz record unit rates), 0.200 ms (for 25-Hz record unit rates), 0.20833 ms (for 24-Hz record unit rates) or 0.20854 ms (for 23.98-Hz record unit rates) as shown in figure 29. The sequence of the control track pulse width shall be locked to the segment inform
33、ation included in the corresponding video data. 7.2.3 Flux polarity The polarity of the tracking-control recording flux shall be as defined by IEC 61213 section 5 and figure 29. 7.3 Time and control code track record parameters The signal format recorded on the time code track shall be in accordance with SMPTE 12M. Source pictures that have frame rates of 50 Hz or 59.94 Hz are coded such that each frame pair is recorded in the appropriate record unit. Page 30 of 91 pages
