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參數(shù)資料
| 型號(hào)： | TVP5154AIPNPR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 顏色信號(hào)轉(zhuǎn)換 |
| 英文描述： | COLOR SIGNAL DECODER, PQFP128 |
| 封裝： | PLASTIC, HTQFP-128 |
| 文件頁數(shù)： | 77/92頁 |
| 文件大?。?/td> | 1089K |
| 代理商： | TVP5154AIPNPR |
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SAV
EAV
SAV
EAV
Unscaled
Scaled
www.ti.com
SLES214C – DECEMBER 2007 – REVISED SEPTEMBER 2010
8
Scaler Configuration
8.1
Overview
The TVP5154A contains four independent scalers, one for each video decoder channel. Each scaler is
able to filter and scale both horizontally and vertically to different ratios.
Horizontally, a 7-tap poly-phase filter is used to ensure optimal scaling performance and can be
configured to scale to any output size below the input resolution, in decrements of two pixels. Vertically a
running average filter is used to filter vertically and can be configured to scale to any output size below the
input resolution.
When scaling horizontally, the output pixels are packed together to allow continuous reading of the pixels.
AVID should be configured so that it qualifies the active pixels, allowing the receiving back end to ignore
nonactive pixels. When scaling vertically, inactive lines are not removed from the output since there is no
internal frame memory. The receiving back end must use AVID to qualify active lines/pixels. AVID can be
configured to be either active or inactive during invalid output lines.
Due to the fact that vertical scaling is performed on a field basis, it is possible that the vertical resolution
will be reduced due to filtering across lines within the field, rather than adjacent lines in the frame. Aliasing
will not occur, but the output image will appear soft vertically. If the desired scaling ration is 0.5, this can
be achieved by simply ignoring every other field. This maintains sharpness, but may introduce aliasing
artifacts.
8.2
Horizontal Scaling
8.2.1
Registers
The horizontal scaler uses a 32-phase polymorphic filter. Excellent performance can be achieved by using
the set of coefficients programmed into the 5154 for all scaling ratios.
It is necessary to program the input and output scaling control registers (3AB and 3AD).
Figure 8-1 shows how data is packed horizontally when scaled.
Figure 8-1. Unscaled and Scaled Pixel Data Alignment
Copyright 2007–2010, Texas Instruments Incorporated
Scaler Configuration
79
Product Folder Link(s): TVP5154A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TVP5154AIPNP | COLOR SIGNAL DECODER, PQFP128 |
| TVP5154APNPR | COLOR SIGNAL DECODER, PQFP128 |
| TVP5154APNP | COLOR SIGNAL DECODER, PQFP128 |
| TVP5154PNPG4 | COLOR SIGNAL DECODER, PQFP128 |
| TVP5154PNPRG4 | COLOR SIGNAL DECODER, PQFP128 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TVP5154APNP | 功能描述:視頻 IC 4Ch Lo Pwr PAL/NTSC SECAM Vid Dec RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| TVP5154APNPR | 功能描述:視頻 IC 4Ch Lo Pwr PAL/NTSC SECAM Vid Dec RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| TVP5154EVM | 功能描述:視頻 IC 開發(fā)工具 TVP5154 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Boards 類型:YPbPr to RGBHV Converters 工具用于評(píng)估:LMH1251 工作電源電壓:5 V |
| TVP5154PNP | 功能描述:視頻 IC 4Ch Lo Pwr PAL/NTSC/ SECAM Video Decoder RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| TVP5154PNP | 制造商:Texas Instruments 功能描述:4-Channel Video Decoder |
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