BS EN 60461:2011
$189.07
Time and control code
| Published By | Publication Date | Number of Pages |
| BSI | 2011 | 48 |
IEC 60461:2012 specifies a digital time and control code for use in television, film, and accompanying audio systems operating at nominal rate of 60, 59, 94, 50, 30, 29, 97, 25, 24 and 23,98 frames per second. This International Standard specifies a time address, binary groups, and flag bit structure. In addition, the standard specifies a binary group flag assignment, a linear time code transport, and a vertical interval time code transport. It cancels and replaces the third edition published in 2001, of which it constitutes a technical revision. It includes the following significant change with regard to the previous edition: The time code for progressive television systems with a frame rate greater than 30 frames per second is added. This bilingual version (2012-01) corresponds to the monolingual English version, published in 2010-03.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | CONTENTS |
| 10 | INTRODUCTION |
| 11 | 1 Scope 2 Normative references 3 Terms, definitions and reserved 3.1 Terms and definitions |
| 13 | 3.2 Reserved 4 Time representation in 30 frames per second and 60 frames per second systems 4.1 Definitions of real time and NTSC time 4.2 Time address of a frame |
| 14 | 4.3 Colour frame identification in NTSC analogue composite television systems 5 Time representation in 25 frames per second and 50 frames per second systems 5.1 Definition of real time 5.2 Time address of a frame |
| 15 | 5.3 Colour frame identification in PAL analogue composite television systems 6 Time representation in 24-frame systems 6.1 Definitions of real time and NTSC time |
| 16 | 6.2 Time address of a frame 7 Structure of the time address and control bits 7.1 Numeric code 7.2 Time address 7.3 Flag bits |
| 17 | 7.4 Use of the binary groups Tables Table 1 – Binary group flag assignments |
| 18 | 7.5 Clock time reference – Binary group flag combinations |
| 19 | 8 Linear time code application 8.1 Code word format 8.2 Code word data content Table 2 – LTC time address bit positions |
| 20 | Table 3 – LTC flag bit positions Table 4 – LTC binary group bit positions |
| 21 | 8.3 Modulation method Table 5 – LTC synchronization word bit positions and values |
| 22 | 8.4 Bit rate 8.5 Timing of the code word relative to a television signal Figures Figure 1 – Linear time code source output waveform |
| 23 | 8.6 Linear time code interface electrical and mechanical characteristics |
| 24 | Figure 2 – 29,97/30 frame linear time code example |
| 25 | Figure 3 – 25 frame linear time code example |
| 26 | Figure 4 – 24 frame linear time code example |
| 27 | Figure 5 – Linear time code relationship to 59,94 frame progressive video example |
| 28 | 9 Vertical interval application – Analogue television systems 9.1 Code word format 9.2 Code word data content |
| 29 | Figure 6 – 525/59,94 vertical interval time code address bit assignment and timing |
| 30 | Figure 7 – 625/50 vertical interval time code address bit assignment and timing |
| 31 | Table 6 – VITC time address bit positions Table 7 – VITC flag bit positions |
| 32 | Table 8 – VITC binary group bit positions |
| 33 | 9.3 Modulation method 9.4 Bit timing Figure 8 – Vertical interval time code waveform Table 9 – CRC bit positions |
| 34 | 9.5 Timing of the code word relative to the television signal 9.6 Location of the address code signal in the vertical interval 9.7 Redundancy |
| 35 | 9.8 Vertical interval time code waveform characteristics 10 Relationship between LTC and VITC 10.1 Time address data 10.2 Binary group data Table 10 – VITC logic level ranges |
| 36 | 10.3 VITC and LTC code word comparison |
| 37 | Table 11 – Summation of VITC and LTC codeword bit definitions |
| 38 | 11 Progressive systems with frame rates greater than 30 frames per second 11.1 Time address of a frame pair in 50 and 60 frames per second progressive systems 11.2 Implementation guidelines Figure 9 – Example of frame labeling for 50 and 60 frames per second progressive systems |
| 39 | Annex A (informative) Explanatory notes |
| 41 | Annex B (informative) Converting time codes when converting video from 24 fps television systems |
| 42 | Figure B.1 – Example of conversion of 23,98 fps video to 525/59,94/I |
| 43 | Figure B.2 – Example of conversion of 24 fps high definition video to 625/50/I |
| 44 | Bibliography |
