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參數資料
| 型號： | ADV7174 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Chip Scale PAL/NTSC Video Encoder with Advanced Power Management |
| 中文描述： | 芯片級PAL / NTSC制式視頻編碼器與高級電源管理 |
| 文件頁數： | 41/52頁 |
| 文件大小： | 488K |
| 代理商： | ADV7174 |
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ADV7174/ADV7179
APPENDIX 2—CLOSED CAPTIONING
The ADV7174/ADV7179 supports closed captioning, conform-
ing to the standard television synchronizing waveform for color
transmission. Closed captioning is transmitted during the
blanked active line time of Line 21 of the odd fields and Line
284 of even fields.
Rev. A | Page 41 of 52
Closed captioning consists of a 7-cycle sinusoidal burst that is
frequency-locked and phase-locked to the caption data. After
the clock run-in signal, the blanking level is held for 2 data bits
and is followed by a Logic 1 start bit. 16 bits of data follow the
start bit. These consist of two 8-bit bytes, 7 data bits, and 1 odd
parity bit. The data for these bytes is stored in closed captioning
Data Registers 0 and 1.
The ADV7174/ADV7179 also supports the extended closed
captioning operation, which is active during even fields, and is
encoded on scan Line 284. The 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 284 are automatically generated by the
ADV7174/ADV7179. All pixel inputs are ignored during Lines
21 and 284. FCC Code of Federal Regulations (CFR) 47 Section
15.119 and EIA-608 describe the closed captioning information
for Lines 21 and 284.
The ADV7174/ADV7179 uses a single buffering method. This
means that the closed captioning buffer is only one byte deep,
therefore there will be no frame delay in outputting the closed
captioning data unlike other 2-byte deep buffering systems. The
data must be loaded at least one line before (Line 20 or Line 283)
it is outputted on Line 21 and Line 284. A typical implementation
of this method is to use VSYNC to interrupt a microprocessor,
which in turn loads the new data (two bytes) every field. If no
new data is required for transmission, you must insert zeros in
both the data registers; this is called
nulling
. It is also important
to load control codes, all of which are double bytes, on Line 21,
or a TV cannot recognize them. If you have a message such as
“Hello World,” which has an odd number of characters, it is
important to pad it out to an even number to get the end of the
caption 2-byte control code to land in the same field.
50 IRE
12.91
μ
s
S
T
A
R
T
P
A
R
I
T
Y
P
A
R
I
T
Y
D0–D6
D0–D6
10.003
μ
s
33.764
μ
s
40 IRE
FREQUENCY = F
= 3.579545MHz
AMPLITUDE = 40 IRE
REFERENCE COLOR BURST
(9 CYCLES)
7 CYCLES
OF 0.5035 MHz
(CLOCK RUN-IN)
10.5 ± 0.25
μ
s
TWO 7-BIT + PARITY
ASCII CHARACTERS
(DATA)
27.382
μ
s
BYTE 0
BYTE 1
0
Figure 56. Closed Captioning Waveform (NTSC)
相關PDF資料 |
PDF描述 |
|---|---|
| ADV7174BCP | Chip Scale PAL/NTSC Video Encoder with Advanced Power Management |
| ADV7174BCP-REEL | Chip Scale PAL/NTSC Video Encoder with Advanced Power Management |
| ADV7174KCP | Chip Scale PAL/NTSC Video Encoder with Advanced Power Management |
| ADV7174KCP-REEL | Chip Scale PAL/NTSC Video Encoder with Advanced Power Management |
| ADV7179 | Chip Scale PAL/NTSC Video Encoder with Advanced Power Management |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ADV7174BCP | 制造商:AD 制造商全稱:Analog Devices 功能描述:Chip Scale PAL/NTSC Video Encoder with Advanced Power Management |
| ADV7174BCP-REEL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Chip Scale PAL/NTSC Video Encoder with Advanced Power Management |
| ADV7174KCP | 制造商:AD 制造商全稱:Analog Devices 功能描述:Chip Scale PAL/NTSC Video Encoder with Advanced Power Management |
| ADV7174KCP-REEL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Chip Scale PAL/NTSC Video Encoder with Advanced Power Management |
| ADV7174KCPZ-REEL | 功能描述:Video Encoder IC Digital Cameras, Mobile Phones, Portable Video 40-LFCSP-WQ (6x6) 制造商:analog devices inc. 系列:- 包裝:帶卷（TR） 零件狀態:有效 類型:視頻編碼器 應用:數碼相機，手機，便攜式視頻 電壓 - 電源，模擬:2.8 V，3.3 V 電壓 - 電源，數字:- 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤，CSP 供應商器件封裝:40-LFCSP-WQ（6x6） 標準包裝:2,500 |
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