Sampling - This is the digital process by which analog information is measured, often millions of times per second, in order to convert analog to digital.
Video-on-Demand (VOD) - A programming library service offering the individual viewer the choice of the available content on demand. When the program is requested and confirmed (by telephone or Internet) it is then delivered to the viewer over an available channel in encrypted form. VOD services are generally arranged on a "Pay per View" basis, analogous to the cinema.
DBS (direct broadcast satellites) - These satellites are powerful enough to be received by an 18 inch dish. They use Ku-band frequencies. Companies that provide DBS services to consumers in the U.S. are DirecTV and Dish Network. Canadian DBS providers are Star Choice and Bell ExpressVu. Also called DSS.
Pixels Per Inch - Pixels per inch (PPI) is a measure of the sharpness (that is, the density of illuminated points) on a television display screen.
HAVi - (Home Audio Video Interoperability) - This is a standard for 1394 bus audio and video devices. It is software that is required for the units to talk to each other. HAVi allows plug-and-play recognition of devices, interoperability, and brand independence.
EDTV - Enhanced Definition Television. A term defining a television that displays the picture (either from SDTV or HDTV) at a resolution of 480p lines in either 4 - 3 or 16 - 9 aspect ratio and which includes Dolby Digital AC-3 multichannel sound.
Aspect Ratio - the ratio of image width to image height. The term may apply to the display device configuration, or the shape of the content being displayed. (See Letterboxing) HDTV uses an aspect ratio of 16 units wide by 9 units high. Conventional television programming and displays are at an aspect ratio of 4 - 3. Digital SDTV programs may aspect ratios from 4 - 3 to 16 - 9, dependant on content and its source (e.g. upconverted NTSC is likely to be 4 - 3).
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