參數(shù)資料
型號(hào)： ADV7192
廠商： Analog Devices, Inc.
英文描述： Video Encoder with Six 10-Bit DACs, 54 MHz Oversampling and Progressive Scan Inputs
中文描述： 視頻編碼器與六10位DAC，54兆赫采樣和逐行掃描輸入
文件頁(yè)數(shù)： 47/69頁(yè)
文件大?。?/td> 664K
代理商： ADV7192
ADV7192
–47–
REV. 0
APPENDIX 2
CLOSED CAPTIONING
The ADV7192 supports closed captioning conforming 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
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 ADV7192 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 ADV7192
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 ADV7192 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 outputted
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 96. Closed Captioning Waveform (NTSC)
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ADV7194KSTZ 制造商:Analog Devices 功能描述:TV / Video IC
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