參數(shù)資料
型號(hào)： 8817
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： NTSC/PAL Digital Video Encoder
中文描述： NTSC / PAL數(shù)字視頻編碼器
文件頁(yè)數(shù)： 29/43頁(yè)
文件大?。?/td> 818K
代理商： 8817
ASAHI KASEI
[AK8817]
MS0413-E-00
29
2005 / Aug
( 17 ) WSS function
The AK8817 supports to encode the WSS ( ITU-R. BT.1119 ) which distinguishes the aspect ratio and sets CGMS-A etc..
Turning “ON/OFF“ of this function is made by setting both VMOD-bit = 1 and WSS-bit = 1 of { Control 1 Register ( 0x00 ) }.
And data to be set is written into { VBID / WSS Data1 & 2 Registers ( 0x02, 0x03 )}.
WSS Data Update timing
VSYNC
NEW DATA
DATA
OLD DATA
NEW DATA
u-P Data
Set Control Register
WSS Waveform
10.5usec
11.0 +/- 0.25usec
27.4usec
38.4usec
44.5usec
500mV +/- 5%
1.5usec
0
H
Encode line : former half of Line 23 ( Blank output during latter half )
Coding : Bi-phase modulation coding
Clock : 5 MHz ( Ts = 200 nS )
Encoding details as follows
Run-in
Start code
Group 1
Aspect ratio
Group 2
Enhanced
Services
24 elements
Bit numbering
4 5 6 7
LSB MSB
0 : 000111
1 : 111000
Group 3
Subtitles
Group4 Reserved
29 elements
24 elements
24 elements
Bit numbering
0 1 2 3
LSB MSB
0 : 000111
1 : 111000
18 elements
Bit numbering
8 9 10
LSB MSB
0 : 000111
1 : 111000
18 elements
Bit numbering
11 12 13
LSB MSB
0 : 000111
1 : 111000
0x1F1C71C7
0x1E3C1F
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