參數(shù)資料
型號： ADV7302AKST
廠商： ANALOG DEVICES INC
元件分類： 顏色信號轉(zhuǎn)換
英文描述： Sand Paper; Abrasive Grade:A VFN; Color:Maroon; Pack Quantity:6; Roll Length:30ft; Width:2"
中文描述： COLOR SIGNAL ENCODER, PQFP64
封裝： PLASTIC, MS-026BCD, LQFP-64
文件頁數(shù)： 54/68頁
文件大小： 1177K
代理商： ADV7302AKST
REV. A
–54–
ADV7302A/ADV7303A
Appendix C
SD CLOSED CAPTIONING
[Subaddresses 51h–54h]
The ADV7302A/ADV7303A supports closed captioning con-
forming 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 the 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. Sixteen 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
the SD Closed Captioning Registers [Addresses 53h–54h].
The ADV7302A/ADV7303A also supports the extended closed
captioning operation that is active during even fields and is
encoded on Line 284. The data for this operation is stored in
the SD Closed Captioning Registers [Addresses 51h–52h].
All clock run-in signals and timing to support closed captioning on
Lines 21 and 284 are generated automatically by the ADV7302A/
ADV7303A. 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 ADV7302A/ADV7303A 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 one line before (Line 20 or
Line 283) it is output on Line 21 and Line 284. A typical
implementation of this method is to use
VSYNC
to interrupt a
microprocessor, that in turn will load the new data (two bytes)
every field. If no new data is required for transmission, “0”
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” that has an odd number
of characters, it is important to pad it out to even to get the
“end of caption” 2-byte control code to land in the same field.
S
T
A
R
T
P
A
R
I
T
Y
P
A
R
I
T
Y
D0–D6
D0–D6
10.5
0.25 s
12.91 s
7 CYCLES OF
0.5035MHz
CLOCK RUN-IN
REFERENCE COLOR BURST
(9 CYCLES)
FREQUENCY = F
= 3.579545MHz
AMPLITUDE = 40 IRE
10.003 s
50 IRE
40 IRE
27.382 s
33.764 s
BYTE 1
BYTE 0
TWO 7-BIT + PARITY
ASCII CHARACTERS
(DATA)
Figure 83. Closed Captioning Waveform, NTSC
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PDF描述
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