HDTV Dish Article
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is HDTV ?
HDTV from DISH Network provides high resolution
widescreen High Definition programming, integrated with
Dolby Digital ® 5.1 channel surround sound that makes
your television viewing experience come to life. Live
life in high definition.
- With all-digital HD
DISH Network transmits as many as 10 times
more pixels, or picture frames, than you are used to
seeing on a standard broadcast television, resulting
in sharper, more lifelike colors and richer sounds.
broadcasts all HD programs in widescreen (16:9)
format. Unlike standard (4:3) format, which causes
some images to appear squeezed in the middle or cut
off along the sides of the screen, widescreen HD
broadcasts reproduce screen images as they were
originally meant to be seen.
- HDTV's use a method of
scanning called "progressive" scan to produce a
flicker-free image, making text easier to read and
fast-motion video appear smoother than televisions
that use interlaced scanning. Interlaced scanning
refreshes pixels in alternations - first the odd
lines, then the even lines - showing only 1/2 of the
screens picture elements at any given moment.
Progressive scan means that all 1 million pixels on
the screen are refreshed simultaneously.
Glossary of HDTV Terms
Aspect ratio is the difference between the width and
height of the picture as it is displayed on the
television screen. Television screens are available in
both standard (4:3) and widescreen (16:9) formats. The
standard format causes some images to appear squeezed in
the middle or cut off along the sides of the screen.
High Definition programs are broadcast in widescreen
format, which allows the images to be projected as they
were originally meant to be seen.
Resolution is the number of pixels (individual points of
color) that are displayed on a monitor or screen. The
sharpness of the image on a display depends on the
resolution and the size of the monitor Ð the greater the
resolution (more pixels) the better the picture!
Pixels, or picture elements, are the individual points
of color that make up a television screen image.
represents the richest pixel format available, with more
than 1 million active pixels displayed on the television
screen at any one time.
The signal modulation system used for over-the-air
digital television broadcasts
Scanning (Interlaced and Progressive)
HDTV's use a method of scanning called "progressive"
scan to produce a flicker-free image, making text easier
to read and fast-motion video appear smoother.
Progressive scan means that all 1 million pixels on the
screen are refreshed simultaneously, unlike analog TVs
with "interlaced" scan. Interlaced scanning refreshes
pixels in alternations - first the odd lines, then the
even lines. As a result, only half the pixels on screen
are showing at any given moment
Standard Definition TV (SDTV)
- SDTV is the basic level of quality display and resolution for
both analog and digital. Transmission of SDTV may be in either the
traditional (4:3) or widescreen (16:9) format.
Enhanced Definition TV (EDTV)
- EDTV is a step up from Analog Television. EDTV comes in 480p
widescreen (16:9) or traditional (4:3) format and provides better picture
quality than SDTV, but not as high as HDTV.
High Definition TV (HDTV)
- HDTV in widescreen format (16:9) provides the highest
resolution and picture quality of all digital broadcast formats. Combined
with digitally enhanced sound technology, HDTV sets new standards for
sound and picture quality in television. (Note:
HDTV and digital TV are
not the same thing -- HDTV is one format of digital TV.)
Provided by www.dtv.gov/)
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