Panasonic CT-27D10 Manuel d'utilisation - Page 17
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FREQUENTL Y ASKED
QUESTIONS
ABOUT
DIGITAL
TV
Frequently Asked Questions About Digital TV
What is digital TV (DTV)?
In April 1997, the FCC (Federal
Communications
Commission)
announced
that by
2006, all television
broadcasting
will be digital.
Digital "IV broadca_iting
delivers
crystal-clear
pictures, approaching
the quality of 35mm movies and CD (compact disc)
sound.
Digital
broadcasts
include
both
High Definition
Television
(HDTV)
and
Standard Definition Television
(SDTV). Broadcasters
may choose their own broadcast
formats.
HDTV (High Definition Television)
One form
of digital
broadcasting
is HD-I'V, which provides
the highest
resolution
picture.
Besides incredible picture, the sound is available
in the 5.1 channel surround
sound.
SDTV (Standard Definition Television)
Another form of digital broadcasting is SDTV, which provides lower resolution, but still
presents a very sharp, clear picture.
Lower resolution allows broadcasters
to transmit
more than one program per channel.
When will TV stations start broadcasting
digital signals?
Television stations are required to continue broadcasting regular IV
signals along
side the digital signals until 2006.
Cable TV and satellite "IV are not affected by this
FCC ruling.
All stations
are required to become
digital by 2006. This will be an evolutionary
process.
According
to the FCC, digital broadcasting
must be available in the top ten
markets,
covering
30% of households
by May 1999.
By the end of 1999, digital
broadcasting
must be available
in the top 30 markets, covering 50% of households.
Will I be able to adapt my current TV to receive digital broadcasts?
Manufacturers
will offer a digital "IV set-top box (D'I'V-STB)
which will allow current
televisions
to display digitally broadcast programs.
The picture and sound quality will
be about the same as small dish digital satellite systems today.
Conventional
televisions
(non-digital
televisions)
will not be able to display the HDTV
resolution
quality or sound.
What digital formats will broadcasters
use?
There are presently four DTV formats:
1080i (interlaced),
720p (progressive),
480i
and 480p.
The higher numbers indicate a higher resolution
picture.
In an interlaced
picture, the odd numbered lines (picture information)
are scanned first
creating field 1 and then the even numbered
lines are scanned, creating field 2. The
two fields are then interlaced
to provide the entire image (one frame).
This process
happens
in
1/30 th
of a second and is invisible to the human eye.
In progressive
scanning, all lines in the entire frame are scanned sequentially
in
1/60 th
of a second.
Broadcasters
may choose to transmit different levels of resolution throughout the day,
broadcasting
day programs in SDTV and night sports and movies in HDTV.