User`s guide

13
How TV Elite XGA works
TV Elite XGA is a class of product called a Scan Converter. The
video signal Frequency and the way that images are displayed on a
VGA monitor and a TV are very different. TV Elite XGA converts the
Progressive Scan VGA signal from your computer into an Interlaced
video signal that can be displayed on standard definition televisions.
The Differences between TV and VGA
VGA - Progressive Scan pixels per inch
Frequency: 31.5 Hz Horizontal
60 – 150 Hz Vertical
Lines or Pixels: Pixels per inch; i.e. 800 x 600
TV - Horizontal lines of Interlaced video
Frequency: 15.7 Hz Horizontal
60 Hz Vertical
Lines or Pixels: 525 Horizontal Scan lines
(480 visible on the screen)
Frame Rate: 30 frames per second, but display is interlaced
so only _ of the image is displayed in every _
second. Each _ second display is called a
Field. There are 2 fields per frame, therefore
60 fields per second to make up 30 frames per
second.
From the above you can see that the basic method of displaying an
image on a computer screen is very different from the way televisions
work. VGA is measured in pixels per inch while TV is measured in
horizontal scan lines. VGA is progressive, meaning the VGA image is
presented simultaneously while a TV image is Interlaced meaning that
only _ of the TV image is presented every _ second. Only with the
advent of Digital High Definition TV (HDTV) are we starting to see some
progressive display technology on televisions.
What does this mean? While TV Elite XGA does a very good job of
converting the VGA signal to display on standard definition televisions,
computer images converted to be viewed on a TV will never look quite
as good as the VGA image.