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參數(shù)資料
| 型號： | ADV7175 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Integrated Digital CCIR-601 YCrCb to PAL/NTSC Video Encoder |
| 中文描述： | 綜合數(shù)字無線電咨詢委員會，601 YCrCb到PAL / NTSC制式視頻編碼器 |
| 文件頁數(shù)： | 24/36頁 |
| 文件大?。?/td> | 447K |
| 代理商： | ADV7175 |
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ADV7175/ADV7176
REV. A
–24–
APPE NDIX 2
CLOSE D CAPT IONING
T he ADV7175/ADV7176 supports closed captioning conforming to the standard television synchronizing waveform for color trans-
mission. Closed captioning is transmitted during the blanked active line time of line 21 of the odd fields.
Closed captioning consists of a 7-cycle sinusoidal burst that is frequency and phase locked to the caption data. After the clock run in
signal, the blanking level is held for two data bits and is followed by a Logic Level “1” start bit. Sixteen bits of data follow the start
bit. T hese consist of two 8-bit bytes. T he data for these bytes is stored in closed captioning data registers 0 and 1.
T he ADV7175/ADV7176 also supports the extended closed captioning operation which is active during even fields and is encoded
on scan line 284. T he data for this operation is stored in closed captioning extended data registers 0 and 1.
All clock run-in signals and timing to support closed captioning on lines 21 and 282 are generated automatically by the ADV7175/
ADV7176. All pixels inputs are ignored during lines 21 and 282.
FCC Code of Federal Regulations (CFR) 47 section 15.119 and EIA208 describe the closed captioning information for lines
21 and 284.
13.407μs
S
T
A
R
T
P
A
R
I
T
Y
P
A
R
I
T
Y
D6–D0
D6–D0
10.003μs
17.379μs
33.764μs
50 IRE
40 IRE
FREQUENCY = F
= 3.579545MHz
AMPLITUDE = 40 IRE
REFERENCE COLOR BURST
(9 CYCLES)
Figure 43. Closed Captioning Waveform (NTSC)
相關PDF資料 |
PDF描述 |
|---|---|
| ADV7175KS | Integrated Digital CCIR-601 YCrCb to PAL/NTSC Video Encoder |
| ADV7176 | Integrated Digital CCIR-601 YCrCb to PAL/NTSC Video Encoder |
| ADV7176KS | Integrated Digital CCIR-601 YCrCb to PAL/NTSC Video Encoder |
| ADV7177KS | Integrated Digital CCIR-601 to PAL/NTSC Video Encoder |
| ADV7177 | Integrated Digital CCIR-601 to PAL/NTSC Video Encoder |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7175A | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Quality, 10-Bit, Digital CCIR-601 to PAL/NTSC Video Encoder |
| ADV7175AKS | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Quality, 10-Bit, Digital CCIR-601 to PAL/NTSC Video Encoder |
| ADV7175KS | 制造商:AD 制造商全稱:Analog Devices 功能描述:Integrated Digital CCIR-601 YCrCb to PAL/NTSC Video Encoder |
| ADV7176 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Integrated Digital CCIR-601 YCrCb to PAL/NTSC Video Encoder |
| ADV7176A | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Quality, 10-Bit, Digital CCIR-601 to PAL/NTSC Video Encoder |
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