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Glossary
Glossary
Term Description
1080i 1080i is ATSC high definition 1920 x 1080 interlaced video format where a frame of video is delivered
in two fields. The first field contains the odd lines of the image, while the second field contains the
even lines. Each field is updated every 1/60th of a second resulting in 30 frames of video per second.
1080p 1080p is ATSC high definition 1920 x 1080 progressive scan video format where a complete frame
of video is delivered at either 60 or 24 frames per second.
16:9 Aspect ratio of an HDTV signal which is 16 units by 9 units, whatever size those units may be. In the
film trade aspect ratios are described in relation to one, which means this aspect ratio is described
as 16/9 or 1.78:1.
2:2 pull-down Method for transferring 24 frame per second film to PAL/SECAM video running at 25 frames per
second.
2:3 Pull-Down 2:3 pull-down, commonly called 3:2 pull-down, converts film footage to NTSC video. Film footage
is shot at 24 frames per second (FPS) and NTSC video is shot at 30 FPS. 3:2 pull-down refers to the
electronics needed to convert 24 FPS to 30 FPS so that it can be viewed on a NTSC video device. To
accomplish this, 4 frames of film are converted to 5 frames of video by inserting an extra field of film
frame every other frame.
3D Ready A projector that is 3D Ready can accept a 120Hz frame-sequential 3D signal from a computer via
either NVIDIA's 3D Vision system or one of several educational software suites. These projectors are
not compatible with the HDMI
1.4 3D specification used on 3D Blu-ray players and set-top boxes. We
also refer to this type of 3D as PC 3D Ready.
3LCD Common 3 colour system for projecting images via LCD or liquid crystal display. Uses dichroic
mirrors to separate the RGB components of white light coming from a projection lamp. Each colour
is fed to separate LCD panels which control the about of coloured light that passes through. The light
from each LCD is recombined using a dichroic prism before going out the lens and on to a screen.
480i 480i is ATSC Standard Definition Television (SDTV) 720 x 480 or 640 x 480 interlaced video format
where a frame of video is delivered in two fields. The first field contains the odd lines of the image
and the second field contains the even lines. Each field is updated every 1/60th of a second resulting
in 30 frames of video per second.
480p 480p is ATSC Enhanced Definition Television (EDTV) 720 x 480 progressive scan video format
where a complete frame of video is delivered at either 30 or 24 frames per second. 480p also refers
to a display format comprised of 854 x 480 pixels, 16:9 widescreen.
720p 720p is an ATSC high definition 1280 x 720 progressive scan video format where a complete frame
of video is delivered at either 60, 30 or 24 frames per second.
Anamorphic A technique for changing aspect ratios by optically or digitally stretching or compressing an image
to or from a format with a different native aspect ratio. Movie studios used this technique to put the
first widescreen movies on standard 35mm film and then used an anamorphic lens to recreate the
image in the widescreen format in which it was originally shot.
Anamorphic
Lens
An anamorphic lens is a lens that has different optical magnification along mutually perpendicular
radii. This provides the ability to project a source image of one aspect ratio, such as 4:3, into a
different aspect ratio, such as 16:9, by using different magnifications for the horizontal and the vertical
dimensions of the projected image.
Anamorphic
Ready
A projector that supports anamorphic projection using an optional anamorphic lens.
ANSI American National Standards Institute. A private organization that coordinates and administers
various voluntary consensus standards such as ANSI lumens. The first ANSI standard was for pipe
threading in 1919 when it was called the American Engineering Standards Committee.
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