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參數(shù)資料
| 型號： | BT864AKPF |
| 英文描述： | Color Encoder Circuit |
| 中文描述： | 顏色編碼器電路 |
| 文件頁數(shù)： | 38/76頁 |
| 文件大小： | 1050K |
| 代理商： | BT864AKPF |
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1.0 Circuit Description
Bt864A/865A
1.9 Teletext
YCrCb to NTSC/PAL Digital Video Encoder
1-28
Conexant
100138B
1.9.1 CCIR601 Operation (13.5 MHz pixel rate)
The bit duration follows this pattern which repeats every 37 teletext bits. Each
teletext data bit is carried by four CLKs except bits 10, 19, 28, and 37 which are
three CLKs in duration. This pattern continues until all 360 bits (1402 CLKs)
have been transferred.
1.9.2 Square Pixel Operation (14.75 MHz pixel rate)
This bit pattern repeats after every 111 teletext bits: After every teletext bit that is
carried by five CLKs the next three teletext bits are carried by four CLKs except
for the first bit of the pattern which is five CLKs in duration and only the next two
bits are carried by four CLKs. This pattern continues until all 360 bits (1531
CLKs) have been transferred. The repeating bit duration pattern starting at bit 1
would be:
1.9.3 Teletext Clock Generation
Figure 1-20
shows how to generate a teletext clock using a P:Q ratio counter for
shifting out the teletext data serially to the Bt864A/865A. The diagram is for
illustrative purposes only. The actual implementation is left to the user.
Bit number:
Duration in CLKs:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15...
5 4 4 5 4 4 4 5 4 4
4
5
4
4
4...
Figure 1-20. PQ Ratio Counter
Table 1-6. Teletext Clock P and Q Values
CLK
Pixel Rate
P
Q
27 MHz
13.5 MHz
37
144
29.5 MHz
14.75 MHz
111
472
CLK
P
MODULO
Q
REGISTER
RSTN
ENABLE_TTX_CLK
Teletext Clock
ADDER
A
B
SUM
CO
D
Q
CLK
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PDF描述 |
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| BT865AKPF | Color Encoder Circuit |
| BT867KPF | Color Encoder Circuit |
| BT867KPJ | Color Encoder Circuit |
| BT8920EPJ | Analog-to-Digital Converter， 16-Bit |
| BT8920EPJ600 | Analog-to-Digital Converter， 16-Bit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BT864AKRF | 制造商:CONEXANT 制造商全稱:CONEXANT 功能描述:YCrCb to NTSC/PAL Digital Video Encoder |
| BT864KPF | 制造商:BT 功能描述:COLOR SIGNAL ENCODER, PQFP52 |
| BT864KPF-ES1 | 制造商:BT 功能描述:864KPF-ES1 |
| BT865A | 制造商:CONEXANT 制造商全稱:CONEXANT 功能描述:High Performance YCrCb to NTSC/PAL Digital Video Encoders |
| BT865AKPF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Color Encoder Circuit |
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