Analog television has been around for almost half a century while
standard definition TV (SDTV) has been here for more than a decade. The
situation now is more and more content is becoming available in high
definition which are not anymore suited for viewing in analog TV and
SDTV. The switch to High Definition TV (HDTV) seems inevitable but there
are apprehensions whether to do it and what products to consider. This
article will provide basic knowledge on HDTV and help in the selection
process.
Evolution from Analog TV to Digital TV
Before
HDTV was developed, there were two dominant analog TV standards - NTSC
and PAL/ SECAM. Both standards use interlacing technology and 4:3 screen
aspect ratio. During the analog era, there were also attempts to
develop HDTV like the MUSE of Japan. This was eventually turned off
because of big channel bandwidth requirement. Then came the development
of video compression technologies like MPEG-1, MPEG-2, H.264 and VC-1.
This allowed HDTV to be suited for broadcast in available channel
spectrum in satellite, terrestrial and broadband systems. This also led
to the development of optical media like HD DVD and eventually Blu-ray.
Advantages of HDTV over Analog TV and SDTV
Higher
screen resolution is the most noticeable advantage of HDTV over analog
and SDTV. For analog TV, the picture is made up of horizontal interlaced
lines. For SDTV, it is 480p wherein the picture is made up of
progressively scanned frames. For all HDTV formats - 720p, 1080i and
1080p, the interlaced lines or progressive frames are far greater which
result to better picture quality. Another advantage of HDTV is the
picture or aspect ratio. It uses 16:9 versus 4:3 for analog TV and SDTV
which result to cinema-like viewing.
What are the different types of HDTV display?
Plasma
is screen technology based on gas made up of xenon and neon that are
sandwiched between panels of glass. It offers better color and black
picture response and has faster screen refresh rate which make it ideal
for viewing fast-moving videos. Typical screen size is 50-inch with
average cost of $1,500. LCD is screen technology based on liquid
crystals. Advantages over plasma are longer screen life, no screen burn,
better glare response and lesser power consumption. Typical screen size
is 37-inch with average cost of around $1,000. Projection TV, the more
popular of which is DLP, is a cheaper alternative to plasma and LCD.
This is actually a rear projection technology that uses microchip
projectors in conjunction with a color wheel and an array of tiny
mirrors. This mechanism delivers a high contrast ratio and makes it
possible for DLP to be lighter making it ideal for larger HDTV venues.
Average price for a 72-inch screen size is around $2,000.
Analog
TV and SDTV will be gone in a few years time and HDTV will be here to
stay. If you plan to make the purchase now, you should select the choice
that is future-proof. It should work for both existing analog and SD
content and the increasing number of HD content. Also bear in mind that
HDTV is a matured technology and like analog and SDTV will also be gone
sometime in the future. Join the others who have made the switch. Enjoy
the technology now because the next-level high definition technology
Super Hi-Vision is just around the corner.
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