Philips HDTV - Page 26

SDTV Interlaced scan method
1
Vertical Res.
2
: 480 lines
Horizontal Res.
3
: 640 dots
Aspect Ratio
4
: 4:3 Wide
SDTV grade televisions and displays are capable
of displaying a maximum of 480 lines using
interlaced scan method.All resolutions higher
than 480 lines must be reduced to 480 lines in
order to be displayed.
1
Scan Mode
Interlaced scanning is a method that creates a
TV picture with alternating lines of information
and is the cause of flickering. Progressive
scanning is a method that creates a TV picture
with consecutive lines of information that results
in flicker-free picture quality.
2
Vertical Resolution (Scan Lines)
Vertical scan lines refer to the number of
horizontal lines a TV or display can show to
create an image.
As the number of lines increase, more
information is displayed, resulting in better
picture quality.
3
Horizontal Resolution
Each horizontal line in a TV or display is made
up of individual dots (pixels).The higher the
number of pixels, the finer the TV picture
becomes. Horizontal pixel measurements using
today's technology can range from 250 for a
VCR to as much as 500 for a DVD player.
4
Aspect Ratio
Aspect ratio identifies the ratio of the TV screen's
width over its height. A 16:9 aspect ratio refers
to a wide-screen picture format, while a 4:3
refers to a standard TV format.
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User Manual BDH5011