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HD High Definition FTA Free To Air Receivers
High-definition television (HDTV) is a
television broadcasting system with a
significantly higher resolution than traditional
formats (NTSC, SECAM, PAL) allow. Except for
early analogue formats in Europe and Japan, HDTV
is broadcast digitally, and therefore its
introduction sometimes coincides with the
introduction of digital television (DTV): this
technology was first introduced in the USA
during the 1990s, by the Digital HDTV Grand
Alliance (grouping together AT&T, General
Instrument, MIT, Philips, Sarnoff, Thomson, and
Zenith)[1].
While a number of high-definition television
standards have been proposed or implemented on a
limited basis, the current HDTV standards are
defined in ITU-R BT.709 as 1080 active
interlaced or progressive lines, or 720
progressive lines, using a 16:9 aspect ratio.
The term "high-definition" can refer to the
resolution specifications themselves, or more
loosely to media capable of similar sharpness,
such as photographic film. Currently 11% of
American households have HDTV's.
