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參數資料
| 型號： | ADV7194 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Professional Extended-10⑩ Video Encoder with 54 MHz Oversampling |
| 中文描述： | 專業擴展- 10⑩視頻編碼器，54兆赫采樣 |
| 文件頁數： | 47/69頁 |
| 文件大小： | 647K |
| 代理商： | ADV7194 |
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ADV7194
–47–
REV. 0
APPENDIX 2
CLOSED CAPTIONING
The ADV7194 supports closed captioning conforming to the
standard television synchronizing waveform for color transmis-
sion. Closed captioning is transmitted during the blanked active
line time of Line 21 of the odd
fi
elds and Line 284 of even
fi
elds.
Closed captioning consists of a seven-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. These consist of two eight-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 ADV7194 also supports the extended closed captioning
operation which is active during even
fi
elds 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 generated automatically by the ADV7194
All pixels inputs are ignored during Lines 21 and 284 if closed
captioning is enabled.
FCC Code of Federal Regulations (CFR) 47 Section 15.119
and EIA608 describe the closed captioning information for Lines
21 and 284.
The ADV7194 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 two byte deep buffering systems. The data
must be loaded one line before (Line 20 or Line 283) it is out-
putted on Line 21 and Line 284. A typical implementation of
this method is to use
VSYNC
to interrupt a microprocessor, which
in turn will load the new data (two bytes) every
fi
eld. If no new
data is required for transmission, 0s must be inserted in both
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 there is a message like
Hello World
which has an odd number of characters, it is important to pad it
out to even in order to get
end of caption
2-byte control code to
land in the same
fi
eld.
12.91 s
7 CYCLES
OF 0.5035 MHz
(CLOCK RUN-IN)
S
T
A
R
T
P
A
R
I
T
Y
P
A
R
I
T
Y
D0
–
D6
D0
–
D6
10.003 s
33.764 s
50 IRE
40 IRE
FREQUENCY = F
= 3.579545MHz
AMPLITUDE = 40 IRE
REFERENCE COLOR BURST
(9 CYCLES)
10.5 0.25 s
TWO 7-BIT + PARITY
ASCII CHARACTERS
(DATA)
27.382 s
BYTE 0
BYTE 1
Figure 95. Closed Captioning Waveform (NTSC)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADV7194KST | 制造商:Analog Devices 功能描述:Video Encoder 6DAC 10-Bit 80-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:PROFESSIONAL/HDTV NTSC/PAL ENCODER I.C. - Bulk 制造商:Analog Devices 功能描述:IC VIDEO ENCODER |
| ADV7194KSTZ | 功能描述:IC ENCODER VIDEO EXT-10 80-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉換器 系列:- 產品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統 電壓 - 電源，模擬:- 電壓 - 電源，數字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| ADV7194KSTZ | 制造商:Analog Devices 功能描述:TV / Video IC |
| ADV7195 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Multiformat Progressive Scan/HDTV Encoder with Three 11-Bit DACs and 10-Bit Data Input |
| ADV7195KS | 制造商:Analog Devices 功能描述:Video Encoder 3DAC 11-Bit 52-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:MULTI-FORMAT VID+PROGSCAN/HDTV ENCODERIC - Bulk |
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