National Association of Broadcasters. The U.S. trade association of over-air broadcasters started in 1923.

Nearly every projector or display today will support multiple aspect ratios; however, each manufacturer must decide who their intended audience is and optimize the projector for that audience. This means each device has a native aspect ratio that is optimized for specific viewing material. Images shown in native aspect ratio will utilize the entire resolution of the display and achieve maximum brightness. Images shown in other than native aspect ratio will always have less resolution and less brightness than images shown in native aspect ratio.

Native Resolution is the number of physical pixels in a display device. For example, an XGA display has a native resolution of 1024 physical pixels of resolution horizontally and 768 pixels vertically or 786,432 total pixels. See Maximum Resolution.

A screen with a gain rating of under 1 which actually reduces the amount of light reflected back from a projected image. Usually gray, they are used to increase apparent contrast by lowering the black level.

An unwanted random signal.

Also known as progressive scan. Describes how video frames are drawn which, in this case, is completely from top to bottom at every screen update. See Interlaced.

An inexpensive filter used to separate the chroma signal from the luminance signal in composite video. A comb filter does the same task, only better, because it filters resonant frequencies as well.

New Super High pressure projector lamp is a short arc metal halide lamp.Â

National Television Standards Committee. Established the first color TV standard in 1953 and is the North American standard for video and broadcasting. Also used in the Caribbean, South Korea, Japan and South America. A 30 fps signal with 525 lines of resolution of which 480 to 483 are viewable. Transmitted via a 6MHz channel.