» What is non-interlaced?
» What is Matte White?
» What is a Lumen?
» What is loop-through?
» What is keystone effect?
» What is HDTV?
» What is 3:2 pulldown?
» What is SXGA?
» What is XGA?
» What is SVGA?
» What is ANSI Lumens?
» What is DLP?
» What is LCD?
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Q: What is non-interlaced? |
A:
Also called progressive scan.
Long Description:
A method by which all the video scan lines are presented on the screen in one pass instead of two.
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Q: What is Matte White? |
A:
Screen material type.
Long Description:
A screen with a flat, dull surface for even reflection of wide viewing angles.
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Q: What is a Lumen? |
A:
Unit of measure for light.
Long Description:
A unit of measure for the amount of light emitted by a source. 0.98 Ft-c (foot-candles) of light covering a surface of 1 square foot.
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Q: What is loop-through? |
A:
Video Out.
Long Description:
A feature that allows the video signal to be passed through a device relatively unprocessed and sent to a local monitor or other device. The loop-through is separate from the circuits that process a signal for output to the main presentation device.
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Q: What is keystone effect? |
A:
Distorted image shape.
Long Description:
A distorted picture where one edge is not the same dimension as the opposite edge, producing a tapered, or wedge shape. Typically, this results when the image is projected to the screen at an angle. Most projectors now come with keystone adjustments to help adjust the image and prevent this problem.
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Q: What is HDTV? |
A:
High Definition Television.
Long Description:
High Definition Television. HDTV refers to a complete product/system with the following minimum performance attributes: a receiver that receives ATSC terrestrial digital transmissions and decodes all ATSC Table 3 video formats; a display scanning format wiht active vertiacal scanning lines of 720 progressive (720p), 1080 interlaced (1080i), or higher; aspect ratio capabilities for displaying a 16:9 image; receives and reprduces, and/or outputs Dolby Digital audio.
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Q: What is 3:2 pulldown? |
A:
The process of mathing the fram rate of film to the fram rate of video.
Long Description:
The process of matching the frame rate of film (24 frames per second) to the frame rate of video (30 frames per second). In 3:2 pulldown, one frame of film is converted to three fields (1-1/2 frames) of video, and the next frame of film is converted to two fields (1 frame) of video. THis process is repeated (yielding 3 fields of video, 2 fields, 3 fields, 2 fields...) until the film is fully converted to a video of approximately the same length (duration). Most scan doublers, quadruplers, and scalers use the premise that two fields of video equal one frame, but video created via 3:2 pulldown does not follow that pattern.
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Q: What is SXGA? |
A:
1280x1024
Long Description:
Super Extended Graphics Array. A graphics standard with a resolution of 1280x1024 (1,310,720 pixels).
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Q: What is XGA? |
A:
1024x768
Long Description:
eXtended Graphics Array card. IBM's graphics standard that includes VGA and extended resolutions up to 1024x768 (interlaced 35kHz). This card uses a 15-pin HD VGA-style connector.
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Q: What is SVGA? |
A:
800x600
Long Description:
Super Video Graphics Array. A term used to denote resolutions higher than VGA (640x480). SVGA computer graphics cards have a resolution of 800x600 (480,000 pixels) but may be able to output resolutions of up to 1280x1024 and 16 million colors.
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Q: What is ANSI Lumens? |
A:
The standard for measuring light ouput from a projector.
Long Description:
A standard for measuring light output, used for comparing projectors. Unfortunately, there are enough variables, that the eye will often disagree radically with the ANSI rating. At best, ANSI lumens do fairly well comparing "apples" to "apples". If however one projector uses Halogen lamps and another metal-halide, the halogen projector will seem noticeably dimmer even if the two units rate the same. Other variables, including type of LCD technology (active matrix TFT, Poly-Si, passive), type of overall technology (LCD vs.DLP vs. CRT), contrast ratios, etc. all effect the end result.
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Q: What is DLP? |
A:
Digital Light Processing
Long Description:
In 1977 Texas Instruments developed DMD microchips used in DLP projector subsystems to replace CRT technology. DMD chips use an array of mirrors and memory cells. A digital image is stored in the memory, and then projected when light is reflected onto the mirrors.
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Q: What is LCD? |
A:
Liquid Crystal Display
Long Description:
A panel that utilizes two transparent sheets of polarizing material with a liquid containing rod-shaped crystals between them. When a current is applied to specific pixel-like areas, those crystals align to create dark images. The dark areas are combined with light areas to create text and images on the panel. LCD panels do not emit light but are often back-lit or side-lit for better viewing.
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