DTH - Direct-to-Home satellite delivery. May also be called DBS or Direct broadcast satellite. In Canada, Bell ExpressVu and Star Choice provide DTH services in both HDTV and SDTV.
35mm equivalency - What a digital lens would be equivalent to in terms of a 35mm film SLR camera. Used as a standard for discussing the field of view and magnification power of a lens. In 35mm equivalency, lenses over 50mm are telephoto, whereas lenses below 50mm are wide-angle or fisheye lens. In a digital SLR, a mirror placed in front of the focal plane (where the image sensor sits) bounces the light that comes from the lens upward into a prism and then out the eyepiece. When you press the shutter button, the mirror flips up out of the way so the light can pass to the focal plane.
JPEG (Joint Photographic Experts Group) - A graphics file format designed for use with photographs and other color bitmaps. The JPEG format uses compression algorithms and an "averaging" technique to create files that are smaller than would be the case with other graphics file formats. Saving an image as a JPEG files does cause a very minor loss of image data and in some cases, quality.
HDTV - "High-definition Television." This is the most superior video picture available in Digital TV. In the U.S., the 1080i and 720p formats in a 16:9 aspect ratio are the two acceptable HDTV formats. HDTV is a component of DTV.
Resolution - A measure of how closely packed the dots in a bitmapped image are, often expressed in dots per inch (dpi) or lines per inch (lpi). The higher the number, the higher the quality. However, doubling the resolution of an image results in a computer file four times as large, requiring more hard disk space and computer memory to handle the higher quality image. Resolution is also used to describe how close together a computer printer can print dots in an image. Again, the larger the number, the higher the quality. It is important to know the capability of the printer's resolution before scanning an image in order to get enough information to print the best quality.
GPS - Global Positioning System
Stylus - A pen writing device for the handheld computer. Used with touch-screens to initiate commands with the operating system and also to input data.
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