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參數(shù)資料
| 型號： | 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)： | 12/18頁 |
| 文件大?。?/td> | 487K |
| 代理商： | TMS320AV420 |
TMS320AV420
DIGITAL NTSC ENCODER
SCSS015A – AUGUST 1994 – REVISED SEPTEMBER 1995
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
(a) VLI ON ODD VIDEO FIELDS
(b) VLI ON EVEN VIDEO FIELDS
EVEN
ODD
EVEN
ODD
EVEN
ODD
EVEN
ODD
EVEN
No Vertical-Line Interpolation (IPEN = L)
Field
Raster
EVEN
ODD
EVEN
ODD
EVEN
ODD
EVEN
ODD
EVEN
Vertical-Line Interpolation (IPEN = H)
Field
Raster
ODD
EVEN
ODD
EVEN
ODD
EVEN
ODD
EVEN
ODD
No Vertical-Line Interpolation (IPEN = L)
Field
Raster
ODD
EVEN
ODD
EVEN
ODD
EVEN
ODD
EVEN
ODD
Vertical-Line Interpolation (IPEN = H)
Field
Raster
Figure 13. Vertical-Line Interpolation (VLI)
overlay function
The ’AV420 overlay function enables the superposition of text and graphics on the video. This function is also
known as the on-screen display (OSD) and works by replacing the selected ’AV420 video-input pixels with the
overlaying, the video-input pixels and the overlay-generated pixels are encoded together to form the analog
waveforms.
The ’AV420 overlay interface is composed of the overlay/video-select signal (OLC), the overlay color-setting
signals (OLR, OLG, and OLB) and the overlay luminance-setting signals (YADJ0 and YADJ1). All signals are
inputs to the ’AV420, and their timing is the same as the pixel-input timing. Four overlay luminance levels and
eight overlay colors are available. Table 1 and Table 2 show the overlay color and luminance settings,
respectively.
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