DTV - "Digital television." This comprises all the components of digital television, including HDTV, SDTV, datacasting, and multicasting, falling under the standards established by the ATSC.
Aspect ratio - The ratio of screen width to screen height. For TVs it is either 4:3 (1.33:1) or 16:9 (1.78:1). Theater film uses many different aspect ratios, some as high as 2.5:1.
Fire-wire - (see IEEE 1394)
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.
Dolby Digital 2.0 - This is a two channel (stereo or Pro Logic) version of Dolby Digital. It is often used by DBS systems.
Dolby Digital (Dolby AC-3) - The 5.1 channel audio standard for DTV and HDTV in Canada and the USA. It includes six discreet audio channels - Left, Center, Right, Left Surround (or side), Right Surround (or side), and a subwoofer -- LFE, "low frequency effects" -- (considered the ".1" as it is limited in bandwidth). Many televisions process these six channels into a two channel stereo pair and do not provide the full 5.1 channel surround sound.
ATSC - "Advanced Television Systems Committee." Formed to establish technical standards for U.S. advanced television systems. ATSC is now used as the catch-all nomenclature for DTV broadcast standards.
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