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參數(shù)資料
| 型號(hào)： | HMP8117 |
| 廠商： | Intersil Corporation |
| 英文描述： | NTSC/PAL Video Decoder |
| 中文描述： | NTSC / PAL視頻解碼器 |
| 文件頁(yè)數(shù)： | 19/45頁(yè) |
| 文件大小： | 269K |
| 代理商： | HMP8117 |
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19
DETECTION OF TELETEXT
The teletext decoder monitors the scan lines, looking for the
16-bit clock run-in (sometimes referred to as the clock
synchronization code) used by teletext. If found, it locks to
the clock run-in, the teletext data is sampled and loaded into
shift registers, and the data is then transferred to internal
holding registers.
If the clock run-in is not found, it is assumed the scan line
contains video data unless other VBI information is detected,
such as WSS.
If a teletext clock run-in is found before line 23 or line 289 for
NTSC and (M) PAL, or line 336 for (B, D, G, H, I, N, N
C
) PAL,
the VBI Teletext Detect status bit is immediately set to “1”. If not
found by these lines, the status bit is immediately reset to “0”.
CLOCK
RUN-IN
ACCESSING THE TELETEXT DATA
The teletext data must be output as BT.656 ancillary data.
The I
2
C interface does not have the bandwidth to output
teletext information when needed.
Table 8 illustrates the teletext BT.656 ancillary data format
and Figure 15 depicts the portion of the incoming teletext
signal which is sliced and output as part of the ancillary data
stream. The teletext data is present during the horizontal
blanking interval after the line containing the teletext
information. The actual BT.656 bytes that contain teletext
data only contain 4 bits of the actual data packet. Note that
only the data packet of Figure 16 is sent as ancillary data;
the clock run-in is not included in the data stream.
NOTES:
30. The MSB is bit number: 271 for system C, 279 for system B 525-line and 343 for system B 625-line.
31. The clock run-in is 16 bits wide for both systems and is not included in the BT.656 ancillary data stream.
32. The bit rate is 5.727272 Mbits/s for system B and C on 525/60 systems and 6.9375 and 5.734375 Mbits/second respectively for 625/50 systems.
33. Teletext VBI Video Signal
FIGURE 16. TELETEXT VBI VIDEO SIGNAL
DATA PACKET
Bit 0
MSB
TABLE 8. OUTPUTTING THE SLICED TELETEXT DATA AS BT.656 ANCILLARY DATA
PIXEL INPUT
P15
P14
P13
P12
P11
P10
P9
P8
Preamble
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Data ID
P14
ep
1
1
0
1
0
0
Data Block Number
P14
ep
0
0
0
0
0
1
Data Word Count
P14
ep
0
1
0
1
1
0
Teletext Data
(B, 625-line = 43 bytes)
(B, 525-line = 35 bytes)
(C = 34 bytes)
P14
ep
0 = 525-line
1 = 625-line
0 = system B
1 = system C
bit 343
bit 342
bit 341
bit 340
P14
ep
0
0
bit 339
bit 338
bit 337
bit 336
:
P14
ep
0
0
bit 7
bit 6
bit 5
bit 4
P14
ep
0
0
bit 3
bit 2
bit 1
bit 0
Reserved
P14
ep
0
0
0
0
0
0
P14
ep
0
0
0
0
0
0
CRC
P14
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
NOTES:
34. ep = even parity for P8-P13.
35. CRC = Sum of P8-P14 of Data ID through last user data word. Preset to all zeros, carry is ignored.
36. For 525-line system B, bits 280-343 are “0”.
37. For system C, bits 272-343 are “0”.
HMP8117
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PDF描述 |
|---|---|
| HMP8117CN | NTSC/PAL Video Decoder |
| HMP8154 | NTSC/PAL Encoders |
| HMP8154CN | NTSC/PAL Encoders |
| HMP8156A | NTSC/PAL Encoders |
| HMP8154EVAL1 | NTSC/PAL Encoders |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HMP8117_07 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:NTSC/PAL Video Decoder |
| HMP8117CN | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 80PQFP,0+70C NTSC/PAL VIDEO DECODER W/MA RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| HMP8117CN96 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HMP8117CNZ | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 W/ANNEAL 80PQFP 0+70 DECODER W/MA RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| HMP8154 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:NTSC/PAL Encoders |
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