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HDTV Frequently Asked Questions
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What is Digital Television or DTV ?
Answer
Digital TVs are televisions that can receive and display digital television
broadcasts sent using any one of eighteen digital signaling methods.
Consumer Electronics Association (CEA) classifies digital televisions
in three broad categories: HDTV (High Definition TV),
EDTV (Enhanced Digital TV), and SDTV (Standard Definition TV).
How is my current television different from DTVs ?
Answer
The TV you watch today is based on an analog system developed over 50 years ago.
Due to the analog nature of the system, it is likely that your current TV was
designed to receive analog signals only. You can receive and display digital
broadcasts on your existing analog TV through a digital-to-analog converter box;
however, its quality is compromised by the display limitations of the analog TV.
What is the difference between HDTV, EDTV, and SDTV ?
Answer
HDTV, EDTV, and SDTV reference the ability of a digital television to re-display various
digital TV broadcasts in its original format. Digital TV broadcasts can be transmitted
using any one of eighteen resolution-formats (See#4); however, digital televisions differ
in their ability to redisplay the image, especially when a high-definition image is received.
HDTVs can receive all 18 formats and re-display high-definition images using 540 lines
(1080 lines interlaced) or 720 lines (progressive scanning method) without down converting.
EDTVs can receive all 18 formats including high-definition broadcasts and all 18 formats
are re-displayed at 480 lines using progressive scan method. This method reduces flicker;
however, picture quality may not necessarily outperform 480 interlaced when viewed at normal
viewing distances.
SDTVs can receive all 18 formats including high-definition broadcasts
and all 18 formats are re-displayed at 480 lines using interlacing
(same resolution as current analog TVs). This means that high-definition
broadcasts are down-converted in order to display the image at 480 lines.
What are the different display technologies used in Digital Televisions ?
Answer
Digital televisions use the same display technologies available today for analog TVs
and computer monitors. They include CRT (Cathode Ray Tubes), LCD (Liquid Crystal Displays),
front and rear projection, and PDP (Plasma Display Panels). Most digital TVs today use CRT
and projection technologies; however, the CRT maintains an advantage over projection technologies
with a wider viewing angle that makes it more suitable for living room viewing.
How is a HDTV/EDTV/SDTV different from a HDTV/EDTV/SDTV Monitor ?
Answer
In order to receive digital broadcasts, a digital decoder must be used to receive and
decode digital broadcast signals. Digital decoders can be built into the digital television
itself or they may come in the form of a set-top box that is added separately to the television.
HDTV/EDTV/SDTV Monitors are digital televisions without a digital decoder built into the television.
HDTV/EDTV/SDTV Monitors give you the flexibility to add a digital decoder in the future when digital
broadcasts are more prevalent.
What are the benefits of a Digital Television ?
Answer
The primary benefits of digital televisions are superior picture quality and better sound.
The analog TV signals we watch today are made of 525 interlaced lines and are subject to screen
flickering, ghost-shadows, and blurring. Digital televisions are dramatically different in that
they receive signals digitally in the form of 0s and 1s so problems with ghost-shadows and
blurring go away. Digital signals also produce a higher quality TV picture, displaying crisp,
sharp and vivid images using up to 1080 lines instead of 525 lines. Additionally, digital
television signals can deliver cinema-quality sound effects using 6-channel Dolby Digital surround
sound instead of only two regular stereo channels.
Are digital broadcasts available now ?
Answer
Digital broadcasts are available through terrestrial (antenna), satellite,
and in the near future, cable systems. Major television networks such as ABC, NBC,
CBS, Fox, and HBO have already begun broadcasting digital TV programming.
Do I need component inputs or RGB inputs for my DTV ?
Answer
RGB inputs and component inputs are the best connectivity interface for use with
todays high-resolution digital sources such as DVD players (standard or progressive)
and HDTV decoder set-top boxes. RGB and component inputs work with video signals that
are split into its base components, resulting in a cleaner and purer video signal than
all other connection options. There are two types of component inputs. The standard
component inputs can accept 480i signals while the high-definition component inputs can
handle 480i, 480p, 720p, and 1080i signals from progressive DVD players and HDTV decoder set-top boxes.
Can I connect a DTV to my PC or Laptop ?
Answer
Yes, as long as the digital television is equipped with an RGB input
(15-pin D-sub connector). A digital television is essentially a high quality
computer monitor capable of displaying various resolutions from today's
advanced video cards.
What does "down-convert" mean ?
Answer
Down-convert takes place when a digital broadcast signal exceeds
the display capabilities of the digital television and the broadcast signal
is reduced to match the television's limited display capabilities. For example,
if NBC broadcasts a digital program using 1080 lines (1080i format) while the digital
television is only able to display 480 lines (480i or 480p), the 1080i signal is reduced
or down-converted to only 480 lines, resulting in inferior picture quality.
What does "up-convert" mean ?
Answer
Up-convert takes place when a digital television's display capabilities
exceed the digital broadcast signal and the broadcast signal is increased to
match the TV's display program using 480 lines (480i or 480p) and the digital
television is able to display 1080 lines, the signal is increased or up-converted
to match the TV, resulting in hazy picture quality.
Are digital televisions compatible with my existing video equipment ?
Answer
Most digital televisions are compatible with your existing video equipment;
however, this depends on the types of connectivity options available on the digital TV.
The Majority of HDTV Monitors/TVs are equipped with multiple connection options for
connections with your existing video equipment including VCRs, DVD players, Progressive
DVD players, LaserDisc/VideoCD Players, analog and digital camcorders, Digital VHS players,
and video game machines.
What will the future of digital television look like ?
Answer
The broad bandwidth of the new digital television system facilitates a whole
new spectrum of programming and data services for your home. For example, this bandwidth
allows at least 4 standard-definition TV broadcasts to simultaneously display on your digital
TV screen, in addition to displaying data content such as news, stock reports, email, and other
data related services. In the near future, your digital television will become an information
resource hosting multiple broadcasts in multiple windows while displaying data content in banner strips.
Note:
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