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Digital TV versus HDTV What's the Difference
It used to be that everyone watched analog TV. This technology, which is still
in use for many TV watchers, relies on the same one which allows us to receive
radio signals. Basically, this is your standard antenna TV which will give you
static and poor reception at the most inopportune times. When cable and
satellite came along, people were interested in getting all the new channels
that were becoming available. Technology has improved upon its cable and
satellite with digital TV for a cleaner and more consistent picture. However,
another addition has been made to TV, which gives us a picture so real and
clear, that people are wondering how they were ever impressed by anything else.
HDTV is the next level of quality for those who want to feel like they are right
there at a football game, or flying along the amazing coastline of New Zealand.
Although, digital TV, or 'DTV' sounds similar to 'HDTV,' there are some distinct
differences.
The clearest way to understand the difference between HDTV and DTV is to know
what they do. HDTV stands for High Definition Television and it gives one a
crystal clear, high quality picture. Although, DTV can provide one with a
wonderful picture, it is not as magnificent as an HDTV one. DTV stands for
Digital Television and it refers to how the picture came to be on your
television. Basically, it is the kind of signal one is receiving. Therefore,
although we can describe HDTV as arriving at a television by the same means as
DTV, there is a difference in the quality of the picture one will get.
Another difference between the two is that you can have digital TV capabilities,
yet not be able to receive any HDTV pictures. This does not usually mean that
you have a bad form of digital TV. However, it does mean that you do not live in
an area with any HDTV broadcasting stations. Unfortunately, broadcasting, in
general, has not yet caught up to the technology available. Luckily, for those
of us who are hungry for HDTV's beautiful picture, the first step in getting the
picture will be easier in 2007. The FCC is requiring that stations move to
digital technology by 2007. This still means that those same stations will have
to transmit HDTV channels through their system. Competition will move this
process along much quicker than we think.
Just when the difference between HDTV and DTV started to make sense, consumers
started hearing about the many different kinds of digital TV. In fact, there are
18 different forms of broadcasting for DTV. The definitions applied to each
usually describe the amount of scan lines and scan formats. For example, 480i
means that the digital image is transmitting 240 lines of the picture in tenths
of a second and the other 240 lines in the next tenth of a second. The small
letter “I” that follows the number means that the picture 'interlaces' both
sets of lines to create the whole image. One can think of one set of lines as
even and the other as odd. 480i is just one of the ways by which digital TV is
transmitted to our TV sets.
There is also the progressive format, or for example, 480p. This means that
instead of alternating between transmitting even and odd lines, all 480 lines
are flickered at us every tenth of a second. Many people prefer the 'p' formats
because they produce a somewhat smoother picture than the 'I' format.
These DTV transmissions do not have to be just 480 lines of image. Some use 720
or 525. HDTV usually uses at least 1080i. When thought of this way, one starts
to understand why HDTV is the best of the best of DTV transmissions. To best
view the beauty of HDTV, consumers are being urged to buy HDTV monitors, tuners,
DTV receivers, or even a projector, because not only does HDTV transmit more
lines of an image, it creates a wide screen effect. However, with the right
converters, even your regular TV set is still able to pick up some of the
digital transmissions which broadcasters are now offering. Just be aware that
you will not get the optimal effect until you upgrade your own technology.
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