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HDTV
High-definition
television (HDTV) is a digital television broadcasting system
with a significantly higher resolution than traditional formats
(NTSC, SECAM, PAL). While some early analog HDTV formats were
broadcast in Europe and Japan, HDTV is usually broadcast digitally,
because digital television (DTV) broadcasting requires much
less bandwidth if it uses enough video compression. HDTV technology
was first introduced in the US during the 1990s by a group
of electronics companies called the Digital HDTV Grand Alliance.
High-definition
television (HDTV) potentially offers a much better picture
quality than standard television. HDTV's greater clarity means
the picture on screen can be less blurred and less fuzzy.
HD also brings other benefits such as smoother motion, richer
and more natural colors, and the ability to allow a variety
of input devices to work together.
Almost
all commercially available HD is digital, so the system cannot
produce a snowy or washed out image from a weak signal, effects
from signal interference, such as herringbone patterns, or
vertical rolling.
With
HDTV the lack of imperfections in the television screen often
seen on traditional television is another reason why many
prefer high definition to analog. As mentioned, problems such
as snow caused from a weak signal, double images from ghosting
or multi-path and picture sparkles from electromagnetic interference
do not occur with HDTV digital broadcasts.
The
colors will generally look more realistic, due to greater
bandwidth. The visual information is about 2-5 times more
detailed overall. The gaps between scanning lines are smaller
or invisible. Legacy TV content that was shot and preserved
on 35 mm film can now be viewed at nearly the same resolution
at which it was originally photographed. A good analogy for
television quality is looking through a window. HDTV offers
a degree of clarity that is much closer to this.
The
"i" in these numbers stands for "interlaced"
while the "p" stands for "progressive".
With interlaced scan, the 1,080 lines are split into two,
the first 540 being painted on a frame, followed by the second
540 painted on another frame. This method reduces the bandwidth
and raises the frame rate to 50-60 frames per second. A progressive
scan displays all 1,080 lines at the same time at 60 frames
per second, using more bandwidth. (See: An explanation of
HDTV numbers and laymen's glossary)
Dolby
Digital 5.1 surround sound is broadcast along with standard
HDTV video signals, allowing full surround sound capabilities.
(Standard broadcast television signals usually only include
monophonic or stereophonic audio. Stereo broadcasts can be
encoded with Dolby Surround, an early home video surround
format.) Both designs make more efficient use of electricity
than SDTV designs of equivalent size, which can mean lower
operating costs. LCD is a leader in energy conservation.
Consumer
Electronics
Consumer
electronics include electronic equipment intended for everyday
use. Consumer electronics are most often used in entertainment,
communications and office productivity. Some products classed
as consumer electronics include personal computers, telephones,
audio equipment, televisions, calculators, and playback and
recording of video media such as DVD or VHS. Popular brands
of consumer electronics include a wide range of European,
American, Korean and Japanese based companies including Philips,
Apple, Sony, Toshiba, Samsung, LG and others.
This
web site will help you with the following: digital cameras,
Wii, ipod, nintendo, playstation, xbox, television, tv, cell
phones, mp3 players, camcorders, pda, computers, laptops,
home theatre, stereo, dvr, dvd players, gps, satellite receivers,
cd players.
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