1、SMPTE RECOMMENDED PRACTICE RP 181-1999 Revision of RP 181-1994 Audio Sector Time Code and Equipment Type Information for 19-mm Type D-I Digital Component Recording 1 Scope This practice is intended to provide an audio sector time code (ASTC) and an equipment type information (ETI). The ASTC can assi
2、st the D-I DTTR to accu- rately read time code, especially under still-frame conditions. The ET1 is designed to provide identifica- tion of the record DTTR. This practice applies to recorders operating on the 525-line television system with a frame frequency of 29.97 Hz and the 625-line television s
3、ystem with a frame frequency of 25 Hz. 2 ASTC general ASTC shall be: - A time code internal to the D-I DTTR for the purpose of assisting LTC under some operational modes. - Derived from LTC and be recorded in the user bit area of audio sectors of D-1 helical tracks. - Recordable or editable independ
4、ently from digital audio data so as to be consistent with LTC in terms of lift-off capability of audio data using advance read heads. NOTE - Lift-off for the purpose of this practice is to read-rewrite the data. 3 ASTC format 3.1 Time code data, binary groups data, and assigned and unassigned bits a
5、re extracted from LTC bits. The other bits are ignored. The order- ing of the extracted bits are rearranged to form two different types of data groups. The first group contains the time code and the second group contains the binary groups, as shown in figure 1. Page 1 of 6 pages 3.2 The time code da
6、ta, namely frame, second, minute, and hour, are placed into the user- control word area of the digital audio data block as defined in ANSI/SMPTE 227M (see figure 2). The relation between LTC data and the user- control words is shown in figure 1. 4 ASTC channel allocation 4.1 The ASTC is changing eve
7、ry frame. Within one frame, the ASTC is written in every audio data block of audio channels 2, 3, and 4 (see figure 3). 4.2 One frame contains 5 audio segments (525160 - see figure 5) or 6 audio segments (625150 - see figure 4). One audio segment contains 16 audio data blocks, four for every audio c
8、hannel distributed in EVEN- and ODD-data blocks, which are recorded twice (see figure 3). 4.3 The EVEN- and ODD-data blocks of channels 2, 3, and 4 contain the same ASTC information within one frame (as shown in figures 4 and 5). 5 ET1 general TI shall be: -An equipment type information internal to
9、the D-1 DlTR for the purpose of providing identification of the record DTJR. - Derived from internal manufacturer settings and be recorded in the user bit area of audio sectors of D-I helical tracks. - Recordable or editable independently from digital audio data so as to be consistent with the recor
10、ded video data. Copyright O 1999 by the SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1 100 Approved April 23. I999 RP 181-1999 Audio Data USER No. EVEN USER0 USER2 USER4 USER6 Longitudinal Time Code Bit No. Coding Bit O 1 Bit 1 2 Frame Bi
11、t 2 4 Units Bit 3 8 Bit 8 10 Frame Bit 9 20 tens Bit 10 Drop frame flag Bit 11 Color frame flag Bit 16 1 Bit 17 2 seconds Bit 18 4 Units Bit 19 8 Bit 24 10 Bit 25 20 Seconds Bit 26 40 tans Bit 27 Bit 32 1 Bit 33 2 Minutes Bit 34 4 Units Bit 35 8 Bit 40 10 Bit 41 20 Minutes Bit 42 40 tens Bit 43 Bina
12、ry group flag bit Bit 40 1 Bit 49 2 Hours Bit 50 4 Units Bit 51 0 Bit 56 10 Hours Bit 57 20 tens Bit 58 inasciqned address bit Biphase mark correction bit Block USER No. ODD USER1 USER3 USER5 USER7 Bit 59 Bit 4 BitO Binary group flag bit USER8 _- Bit 5 Bitl Ist (Bit 6 Bit2 Binary Group USER9 Bit 7 B
13、it3 Bit 12 BitO Bit 13 Bitl 2nd Bit 14 Bit2 Binary Group USER10 USER12 USER1 4 Bit 15 Bit3 Bit 20 BitO USER11 USER13 USER1 5 iBit 21 Bitl 3d Bit 22 Bit2 Binary Group Bit 23 Bit3 Bit 28 BitO (Bit 29 Bitl 4th Bit 30 Bit2 Binary Group Bit 31 Bit3 Bit 36 BitO Bit 37 Bitl 5th Bit 30 Bit2 Binary Group Bit
14、 39 Bit3 Bit 44 BitO Bit 45 Bitl 6th Bit 46 Bit2 Binary Group Bit 47 Bit3 Bit 52 BitO Bit 53 Bitl 7th Bit 54 Bit2 Binary Group Bit 55 Bit3 Bit 60 BitO Bit 61 Bitl 8th Bit 62 Bit2 Binary Group ASTC Data Bit O Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit O Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bi
15、t O Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit O Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit O Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit O Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit O Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit O Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 - - - - - - -
16、- - Figure 1 - ASTC data structure Page 2 of 6 pages RP 181-1999 Figure 2 -Audio EVEN-data-block layout (ODD is similar) VIDEO EVEN Data Block &-ODD Data Block ASTC Data marked ET1 Data marked VIDEO Figure 3 -Audio segment on tape Page 3 of 6 pages RP 181-1999 Bit VIDEO 7 161 5 4 (31 21 1 Io Figure
17、4 - Digital audio data blocks for one frame (625/50) VIDEO VIDEO Figure 5 - Digital audio data blocks for one frame (525150) 6 ETIformat Equipment type (ETI) consists of five different sets of information (see figures 6 and 7 for details). DATA O - 2 DATA 3 - 6 DATA 7 - 10 DATA 11 DTTR type 8-bit bi
18、nary number, chosen by manufacturer DATA 12 - 15 Manufacturer identification Serial number of DTTR Serial number of scanner Unused, but reserved (set to O) ISO/IEC 646, 7-bit printing character ISOIIEC 646, 7-bit printing character ISOIIEC 646, 7-bit printing character Set ISOIIEC 646 to 7-bit print
19、ing character o MSB LSB Page 4 of 6 pages RP 181-1999 data block Manufacturer USERO DATA O identification USER1 EVEN audio I ODD audio data block DATA 1 Serial number of DTTR Serial number of scanner USER2 DATA 2 USER3 DATA 3 USER4 DATA 4 USER5 DATA 5 USER6 DATA 6 USER7 DATA 7 USER8 DATA 8 USER9 DAT
20、A 9 USER1 O DATA 10 I DTTR-tvoe I USER11 I DATA 11 - - -I 8- _. . undefined set to 00 USER12 DATA 12 USER13 DATA 13 USER14 DATA 14 - Figure 6 - Equipment type information (ETI) data structure Manufacturer identification USERO USER1 Serial number USER2 USER3 of DTTR Serial number of scanner USER4 USE
21、R5 USER6 USER7 USER8 USER9 USER10 NOTES 1 Manufacturer identification: ABC 2 Serial number of DTTR: 0195 3 Serial number of scanner: 0423 DTTR-type undefined A B C O 1 9 5 O 4 2 3 64 (hex) O O O O - USER1 1 USER1 2 IS0 646 value HEX BIN 41 - O100 O001 42 - O 1 O0 O0 1 O 43-01000011 30 - O01 1 O000 3
22、1 - O01 1 O001 39-0011 1001 35 - O01 1 O101 30-0011 O000 34 - O01 1 O100 32-0011 O010 33 - O01 1 O01 1 64-01100100 oo-oooooooo oo-oooooooo oo-oooooooo oo-oooooooo set to 00 Figure 7 - Example for equipment type information USER14 USER15 Page 5 of 6 pages RP 181-1999 7 Channel allocation ET1 7.1 The
23、equipment type information is recorded on tape in the data blocks of audio channel 1 only. 7.2 The 16 ETI-DATAS are distributed in the EVEN-data block (DATAc with even numbers) and in the ODD-data block (DATAc with odd numbers). The EVEN and the ODD data blocks are recorded twice. 7.3 The same equip
24、ment type information is re- corded in every audio segment. Annex A (informative) Bibliography ANSI/SMPTE 12M-1995. Television, Audio and Film-Time and Control Code ANSIISMPTE 227M-1996, Television Digital Component Recording - 19-mrn Type D-1 - Helical Data and Control Records ISOIIEC 646:1991. Information Technology - IS0 7-Bit Coded Character Set for Information Interchange Page 6 of 6 pages
