S.M.P.T.E. - Code

• Chapter 1) About the Author
• Chapter 2) SMPTE Time Code 80-Bit Longitudinal Bit Assignments
• Chapter 3) Special Bit Assignments

Chapter 1) About the Author

Chapter 2) SMPTE Time Code 80-Bit Longitudinal Bit Assignments

1. 1 BCD Frames Units
2. 2 BCD Frames Units
3. 4 BCD Frames Units
4. 8 BCD Frames Units
5. Bit 0 of 1st Binary Group (User Bits)
6. Bit 1 of 1st Binary Group (User Bits)
7. Bit 2 of 1st Binary Group (User Bits)
8. Bit 3 of 1st Binary Group (User Bits)
9. 10 BCD Frames Tens
10. 20 BCD Frames Tens
11. Drop Frame Flag Bit
12. Color Frame Flag Bit
13. Bit 0 of 2nd Binary Group (User Bits)
14. Bit 1 of 2nd Binary Group (User Bits)
15. Bit 2 of 2nd Binary Group (User Bits)
16. Bit 3 of 2nd Binary Group (User Bits)
17. 1 BCD Seconds Units
18. 2 BCD Seconds Units
19. 4 BCD Seconds Units
20. 8 BCD Seconds Units
21. Bit 0 of 3rd Binary Group (User Bits)
22. Bit 1 of 3rd Binary Group (User Bits)
23. Bit 2 of 3rd Binary Group (User Bits)
24. Bit 3 of 3rd Binary Group (User Bits)
25. 10 BCD Seconds Tens
26. 20 BCD Seconds Tens
27. 40 BCD Seconds Tens
28. Bi-Phase Mark Phase Correction Bit (0)
29. Bit 0 of 4th Binary Group (User Bits)
30. Bit 1 of 4th Binary Group (User Bits)
31. Bit 2 of 4th Binary Group (User Bits)
32. Bit 3 of 4th Binary Group (User Bits)
33. 1 BCD Minutes Units
34. 2 BCD Minutes Units
35. 4 BCD Minutes Units
36. 8 BCD Minutes Units
37. Bit 0 of 5th Binary Group (User Bits)
38. Bit 1 of 5th Binary Group (User Bits)
39. Bit 2 of 5th Binary Group (User Bits)
40. Bit 3 of 5th Binary Group (User Bits)
41. 10 BCD Minutes Tens
42. 20 BCD Minutes Tens
43. 40 BCD Minutes Tens
44. Binary Group Flag Bit (0)
45. Bit 0 of 6th Binary Group (User Bits)
46. Bit 1 of 6th Binary Group (User Bits)
47. Bit 2 of 6th Binary Group (User Bits)
48. Bit 3 of 6th Binary Group (User Bits)
49. 1 BCD Hours Units
50. 2 BCD Hours Units
51. 4 BCD Hours Units
52. 8 BCD Hours Units
53. Bit 0 of 7th Binary Group (User Bits)
54. Bit 1 of 7th Binary Group (User Bits)
55. Bit 2 of 7th Binary Group (User Bits)
56. Bit 3 of 7th Binary Group (User Bits)
57. 10 BCD Hours Tens
58. 20 BCD Hours Tens
59. Unassigned Address Bit 58 (0)
60. Binary Group Flag Bit (0)
61. Bit 0 of 8th Binary Group (User Bits)
62. Bit 1 of 8th Binary Group (User Bits)
63. Bit 2 of 8th Binary Group (User Bits)
64. Bit 3 of 8th Binary Group (User Bits)
65. Bit 0 - Binary Sync Word (0)
66. Bit 1 - Binary Sync Word (0)
67. Bit 2 - Binary Sync Word (1)
68. Bit 3 - Binary Sync Word (1)
69. Bit 4 - Binary Sync Word (1)
70. Bit 5 - Binary Sync Word (1)
71. Bit 6 - Binary Sync Word (1)
72. Bit 7 - Binary Sync Word (1)
73. Bit 8 - Binary Sync Word (1)
74. Bit 9 - Binary Sync Word (1)
75. Bit 10 - Binary Sync Word (1)
76. Bit 11 - Binary Sync Word (1)
77. Bit 12 - Binary Sync Word (1)
78. Bit 13 - Binary Sync Word (1)
79. Bit 14 - Binary Sync Word (0)
80. Bit 15 - Binary Sync Word (1)

Any Unassigned or Unused Bits should be set to a logical zero (0) until assigned or used.

Chapter 3) Special Bit Assignments

Bit 11 - Color Frame Flag. If color frame identification has been intentionally applied, a one (1) shall be recorded.

Bit 27 - "Bi-phase Mark" Phase Correction. This bit shall be put in a state so that every 80-bit word will contain an even number of logical zero's.

Bits 43 and 59 - Binary Group Flag Bits. The Binary Groups (User Bits) are intended for storage of data by the users, and the 32 bits within the 8 broups may be assigned in any manner without restriction if the character set used for the data insertion is not specified and the binary group flag bits 43 and 59 are both zero.

If an 8-bit character set is used, the binary group flag bits 43 and 59 shall be set according to the following truth table:

				Bit 43	Bit 59
Character set not specified	   0	   0
Eigh-bit character set		   1	   0
Unassigned			   0	   1
Unassigned			   1	   1

Note that the 16-Bit Sync word bit values are fixed as indicated above.