- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄374046 > ADV7171 (Analog Devices, Inc.) Digital PAL/NTSC Video Encoder(數(shù)字PAL/NTSC視頻編碼器) PDF資料下載
參數(shù)資料
| 型號： | ADV7171 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Digital PAL/NTSC Video Encoder(數(shù)字PAL/NTSC視頻編碼器) |
| 中文描述： | 數(shù)碼PAL / NTSC視頻編碼器（數(shù)字PAL / NTSC制式視頻編碼器） |
| 文件頁數(shù)： | 32/55頁 |
| 文件大?。?/td> | 580K |
| 代理商： | ADV7171 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁當前第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁
ADV7170/ADV7171
–32–
REV. 0
The ADV7170/ADV7171 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.
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. 16 bits of data follow
the start bit. These consist of two 8-bit bytes, seven data bits
and one odd parity bit. The data for these bytes is stored in
closed captioning Data Registers 0 and 1.
The ADV7170/ADV7171 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 caption-
ing on Lines 21 and 284 are automatically generated by the
ADV7170/ADV7171. All pixels inputs are ignored during
Lines 21 and 284.
APPENDIX 2
CLOSED CAPTIONING
12.91
m
s
S
T
A
R
T
P
A
R
I
T
Y
P
A
R
I
T
Y
D0–D6
D0–D6
10.003
m
s
33.764
m
s
50 IRE
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
6
0.25
m
s
TWO 7-BIT + PARITY
ASCII CHARACTERS
(DATA)
27.382
m
s
BYTE 0
BYTE 1
Figure 56. Closed Captioning Waveform (NTSC)
FCC Code of Federal Regulations (CFR) 47 Section 15.119
and EIA608 describe the closed captioning information for
Lines 21 and 284.
The ADV7170/ADV7171 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 imple-
mentation of this method is to use
VSYNC
to interrupt a micro-
processor, which will in turn load 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 will not recognize them. If
you have a message like “Hello World,” which has an odd num-
ber of characters, it is important to pad it out to an even number
to get “end of caption” 2-byte control code to land in the same
field.
相關PDF資料 |
PDF描述 |
|---|---|
| ADV7173KST | Digital PAL/NTSC Video Encoder with Six DACs 10 Bits, Color Control and Enhanced Power Management |
| ADV7172KST | Digital PAL/NTSC Video Encoder with Six DACs 10 Bits, Color Control and Enhanced Power Management |
| ADV7172 | Digital PAL/NTSC Video Encoder with Six DACs 10 Bits, Color Control and Enhanced Power Management |
| ADV7173 | Digital PAL/NTSC Video Encoder with Six DACs 10 Bits, Color Control and Enhanced Power Management |
| ADV7173* | Digital PAL/NTSC Video Encoder with Six DACs (10 Bits). Color Control and Enhanced Power Management |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADV7171KS | 制造商:Analog Devices 功能描述:Video Encoder 4DAC 10-Bit 44-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:ADVANCED NTSC/PAL ENCODER I.C. - Bulk 制造商:Analog Devices 功能描述:IC VIDEO ENCODER 制造商:Panasonic Industrial Company 功能描述:IC |
| ADV7171KS-REEL | 制造商:Analog Devices 功能描述:Video Encoder 4DAC 10-Bit 44-Pin MQFP T/R 制造商:Rochester Electronics LLC 功能描述:ADVANCED NTSC/PAL ENCODER I.C. - Tape and Reel |
| ADV7171KSU | 制造商:Analog Devices 功能描述:Video Encoder 4DAC 10-Bit 44-Pin TQFP 制造商:Rochester Electronics LLC 功能描述:ADVANCED NTSC/PAL ENCODER - Bulk 制造商:Analog Devices 功能描述:IC VIDEO ENCODER |
| ADV7171KSU-REEL | 制造商:Analog Devices 功能描述:Video Encoder 4DAC 10-Bit 44-Pin TQFP T/R |
發(fā)布緊急采購，3分鐘左右您將得到回復。