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| 型號： | TVP5031CPFP |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Color Decoder Circuit |
| 中文描述： | 彩色解碼器電路 |
| 文件頁數(shù)： | 47/85頁 |
| 文件大小： | 378K |
| 代理商： | TVP5031CPFP |
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2–31
2.7.2
Teletext as Ancillary Data in Video Stream
Sliced teletext data can be output as ancillary data in the video stream in ITU-R BT.656 mode. Teletext data is output
on the Y[7:0] terminals during the horizontal blanking period following the line from which the data was retrieved.
Dummy ancillary data blocks with special timing header information are inserted during certain horizontal blanking
periods to provide data synchronization information. Table 2–8 and Table 2–9 show the format and sequence of the
ancillary data inserted into the video stream.
Table 2–8. NABTS 525-Line Ancillary Data Sequence
BYTE
NO.
MSB
7
6
5
4
3
2
1
LSB
0
DESCRIPTION
1
0
0
0
0
0
0
0
0
2
1
1
1
1
1
1
1
1
Ancillary data preamble
3
1
1
1
1
1
1
1
1
4
NEP
EP
0
1
0
DID2
DID1
DID0
Data ID
5
1
0
0
0
0
0
0
0
Secondary data ID
6
1
0
0
0
1
0
0
1
Number of 32-bit data words
7
Video line number 7:0
Internal data ID
8
0
0
Hamming error
Parity error
LPC error
Match 2
Match 1
Video line 8
9
Packet address 1
Data byte
10
Packet address 2
Data byte
11
Packet address 3
Data byte
12
Continuity index
Data byte
13
Packet structure
Data byte
14
Teletext data 1
Data byte
15
Teletext data 2
Data byte
39
Teletext data 26
Data byte
40
Teletext data 27/suffix
Data byte
41
Teletext data 28/suffix
Data byte
42
NEP
EP
Checksum
Checksum
43
1
0
0
0
0
0
0
0
Fill byte
44
1
0
0
0
0
0
0
0
Fill byte
Table 2–9. Dummy Timing Ancillary Data Sequence
BYTE
NO.
MSB
7
6
5
4
3
2
1
LSB
0
DESCRIPTION
1
2
3
4
5
6
0
1
1
0
1
1
0
1
1
0
0
0
0
1
1
1
0
0
0
1
1
0
0
0
0
1
1
0
1
1
0
1
1
Ancillary data preamble
NEP
1
1
EP
0
0
DID2
0
0
DID1
0
0
DID0
0
0
Data ID
Secondary data ID
Number of 32-bit data words
In the tables above, EP is even parity on the lower 6 bits and NEP is negated even parity. The checksum for teletext
data blocks is the 6 LSBs of the sum of the data bytes. The data ID byte provides timing information. Table 2–10 shows
the possible values of the data ID byte and their meanings.
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