參數(shù)資料
型號(hào)： AL128
廠商： Electronic Theatre Controls, Inc.
元件分類： 圓形連接器
英文描述： Circular Connector; No. of Contacts:55; Series:MS27497; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:22; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No
中文描述： 即插即用VGA到的NTSC / PAL制式轉(zhuǎn)換器
文件頁(yè)數(shù)： 18/45頁(yè)
文件大?。?/td> 498K
代理商： AL128
AL128
April 2, 1999
18
6.5 Flicker Filter
The AL128 chip performs 5 line flicker filtering to reduce the flicker due to interlaced display of high
contrast lines. Eight levels of flicker reduction, as well as sharpness adjustment, are provided to
control the picture quality.
Proprietary dynamic filtering (SmartFilter
) is applied to retain the original PC video resolution and
sharpness while removing the flickering effect. The hardware intelligently detects which parts of the
screen are natural picture and which are text whose clarity needs to be retained. One out of 45
different filters is selected and applied dynamically for each single pixel based on the statistics of its
surrounding pixels. The criteria of which filter to choose from is based on a model derived from the
ensemble of psychophysical experiments based on human eye responses to the flicker of different
picture types.
6.6 Overscan/Underscan Control
Televisions normally overscan, meaning that the border of the picture is outside the visible area of
the TV screen. To program the AL128 from Overscan to Underscan, reduce the horizontal display
width and vertical display height, and increase the H-display delta and V-display delta. For
underscan to overscan, reverse the process. The capture-related registers may need to be
programmed for optimization.
The AL128 linearly scales the input picture into the visible part of a TV’s screen. Digital filtering
techniques are applied to remove the scaling artifacts.
6.7 Pan and Position Control
The panning feature selects the portion of the graphic picture to be displayed on the TV screen.
When in zoom mode, the visible screen can be progressively panned to any area of the virtual screen.
To pan the display, change the values of H-pan delta (Reg. #21h, #26h) and V-pan delta (Reg. #22h,
2Ch). To pan in zoom mode, #2Bh and #2Ch may also need to be programmed.
Position control is used to center the video on the TV screen. To position the display, change the
values of H-display delta (Reg. #52h) and V-display delta (Reg. #51h).
6.8 Zoom Feature
AL128 performs 2x zoom in both horizontal and vertical directions. This can be used with panning,
or activated by jumping to any given quadrant via use of the push buttons or software.
相關(guān)PDF資料
PDF描述
AL1402 Circular Connector; No. of Contacts:100; Series:MS27497; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:22; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No
AL251 Video Scan Doubler
AL3201 Circular Connector; No. of Contacts:19; Series:D38999; Body Material:Metal; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:15-19
AL440B Circular Connector; No. of Contacts:128; Series:MS27497; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:24; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No
AL440B-12 Circular Connector; No. of Contacts:56; Series:MS27497; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:24; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:24-4 RoHS Compliant: No
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