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參數(shù)資料
| 型號(hào)： | TMS320AV420 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Digital NTSC Encoder(數(shù)字NTSC編碼器) |
| 中文描述： | NTSC制式的數(shù)字編碼器（數(shù)字NTSC制式編碼器） |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 487K |
| 代理商： | TMS320AV420 |
TMS320AV420
DIGITAL NTSC ENCODER
SCSS015A – AUGUST 1994 – REVISED SEPTEMBER 1995
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
timing requirements
MIN
TYP
MAX
UNIT
μ
s
tsu3
Setup time, VSYNC
–0.5
30
HSYNC
YOUT
tsu3
1
2
3
4
5
6
7
8
9
10
20
21
VSYNC
Figure 12. External Sync VSYNC Timing
vertical-line interpolation
The ’AV420 vertical-line interpolation (VLI) function optimizes the processing of MPEG-1 pictures. VLI is
selectable by the user. When selected, VLI reduces the jaggedness of slanted straight lines and video flicker
due to the low resolution and low decoding rate of MPEG-1 SIF pictures. VLI applies to the interlaced display
mode only and can be selected when the same decoded MPEG-1 picture is displayed twice as two consecutive
video fields. The IPEN and IPMOD terminals control the VLI operation.
The VLI is performed by vertical pixel averaging between two adjacent lines in either the odd or the even video
fields. It is performed on the YIQ data, Y component only. The user can use VLI on the odd fields and then VLI
on the even fields and select the one that yields the highest video quality. Figure 13 shows the results of VLI
performed on odd and even video fields.
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