1、 SMPTE RP*Lb9 95 m 8357403 0002LL3 776 m RP 169-1995 Television, Audio and Film Time and Control Code - Auxiliary Tme Address Data in Binary Groups - Dialect Specification of Directory Index Locations 1 Scope This practice specifies a method of coding an auxiliary time address into the binary groups
2、 of SMPTE time and control codes, thus providing a second time address storage and storage location. The dialect used provides auxiliary time address hours information conforming to the directory index O0 through 23 (decimal), as specified in ANSVSMPTE 262M. It also conforms to the coding structure
3、of the primary time code located in the time address portion of the time code word. Page 1 of 2 pages of applying the most recent edition of the standards indicated below. ANSI/SMPTE 12M-1995, Television, Audio and Film - Time and Control Code ANSVSMPTE 262M-1995, Television, Audio and Film - Binary
4、 Groups of Time and Control Codes - Storage and Transmission of Data 3 Data structure 3.1 Bit assignment 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
5、 were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility Auxiliary time address data stored in binary groups shall be assigned as shown in table 1. This dialect conforms to the directory index in that the direc
6、tory page index corresponds to the tens of hours of the auxiliary time address. Similarly, the directory line index corresponds to the units of hours of the auxiliary time address. Table 1 - Auxiliary time address bit assignment LTC bits VITC bits Binary group Assignation 4-7 12-1 3 14 15 20-23 28-3
7、0 31 36-39 44-46 47 52-55 60-61 62-63 6-9 16-1 7 18 19 26-29 36-38 39 46-49 56-58 59 66-69 76-77 78-79 1 2 2 2 3 4 4 5 6 6 7 8 8 Frames units Frames tens Drop frame flag Color frame flag Seconds units Seconds tens Unassigned Minutes units Minutes tens Un assigned Hours units (line index) Hours tens
8、(page index) Zero (page index) Copyright O 1995 by the SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (91 4) 761 -1 1 O0 Approved June 1, 1993 SMPTE RP*Lb 95 8357403 O002334 822 RP 169-1995 3.2 Binary group drop frame flag If certain numbers are bein
9、g dropped to resolve the difference between real time and color time, a “1” shall be recorded. This flag refers only to the auxiliary time address data. 3.3 Binary group color frame flag If color frame ID has been intentionally applied to time address data stored in the binary groups, a “1” shall be
10、 recorded. In such cases, the time address numbers shall identify the color frames in the manner as speci- fied by ANSVSMPTE 12M. 3.4 Unassigned bits Unassigned bits shall be set to “O until assigned by SMPTE. 4 Binary group flag bits When the data structure conforms to this format, the binary group
11、 flag bits shall be set in accordance with ANSVSMPTE 12M as shown in table 2. For vertical interval applications, this flag designation shall be repeated in both fields. Table 2 - Binary group flag values for page-line encoding 24- and 30-fps systems 25-fps systems Binary group flag Bit value LTC bit VITC bit LTC bit VITC bit BGF2 1 59 75 43 55 O 1 58 43 74 55 58 27 74 35 I Page 2 of 2 pages
