參數(shù)資料
型號(hào)： TVP5154PNPR
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： GREEN, PLASTIC, HTQFP-128
文件頁(yè)數(shù)： 61/79頁(yè)
文件大小： 908K
代理商： TVP5154PNPR
www.ti.com
9.3.9
Vertical Scaling Control
9.3.10 Horizontal Scaling Control
10 Scaler Configuration
10.1 Overview
TVP5154
4-CHANNEL LOW-POWER PAL/NTSC/SECAM VIDEO DECODER
WITH INDEPENDENT SCALERS AND FAST LOCK
SLES163A – MARCH 2006 – REVISED JULY 2006
Address
3ACh
Default
2100h
7
6
5
4
3
2
1
0
VERT_COEF[7:0]
15
14
13
12
11
10
9
8
Reserved
1
Enable
Reserved
VERT_COEF[8]
Enabled: Enable vertical and horizontal scaler
0 = Disable scaler (default)
1 = Enable scaler
VERT_COEF [8:0]: Vertical scaling coefficient
VERT_COEF = (Vdesired/Vactive)
× 256
Address
3ADh
Default
400h
7
6
5
4
3
2
1
0
HORZ_COEF[7:0]
15
14
13
12
11
10
9
8
Reserved
HORZ_COEF[14:8]
HORZ_COEF[14:0]:
Horizontal scaling coefficient, MSB five bits are integer values and LSB ten bits are fraction numbers.
HORZ_COEF = Hactive/Hdesired
The TVP5154 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.
Scaler Configuration
64
相關(guān)PDF資料
PDF描述
TVP5154PNP COLOR SIGNAL DECODER, PQFP128
TVP5157PNPR COLOR SIGNAL DECODER, PQFP128
TVP5157PNP COLOR SIGNAL DECODER, PQFP128
TVP5156PNPR COLOR SIGNAL DECODER, PQFP128
TVP5156PNP COLOR SIGNAL DECODER, PQFP128
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TVP5154PNPRG4 制造商:TI 制造商全稱:Texas Instruments 功能描述:4-CHANNEL LOW-POWER PAL/NTSC/SECAM VIDEO DECODER WITH INDEPENDENT SCALERS AND FAST LOCK
TVP5156PNP 功能描述:視頻 IC 4Ch NTSC/PAL 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
TVP5156PNPR 功能描述:視頻 IC 4Ch NTSC/PAL 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
TVP5157PNP 功能描述:視頻 IC 4Ch NTSC/PAL 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
TVP5157PNPR 功能描述:視頻 IC 4Ch NTSC/PAL 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
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