Picture Formats - Cisco IPN330HD Installation Manual

Picture Formats

What Is the Difference Between a Standard-Screen and a Wide-Screen HDTV?
The type of screen your HDTV has (wide-screen or standard-screen) determines how the receiver
displays programs on the screen. The picture format for an HDTV is a combination of aspect ratio
and screen resolution and is different for standard-screen and wide-screen HDTVs.
What Is Aspect Ratio?
An aspect ratio is the ratio of the width to the height of the TV screen. The aspect ratios differ
because the television industry manufactures both standard-screen and wide-screen HDTVs to
appeal to consumer viewing preferences.
What Is the Screen Resolution?
The screen resolution indicates the amount of detail that the picture displays. Resolution is identifi ed
by the number of display lines on the screen. The techniques that an HDTV uses to "paint" the picture
on the screen are referred to as progressive and interlaced.
With the progressive scanning method, the lines are drawn on the screen one at a time in sequential
order. Progressive scanning results in a more detailed image on the screen and is also less susceptible
to the fl icker commonly associated with interlaced scanning. The interlaced method involves refreshing
pixels in alternation — fi rst the odd lines and then the even lines.
For advanced setup, select the screen resolution that your TV can support. Refer to your Feature
Guide and HDTV owner's manuals to choose the proper screen resolution (480i, 720p, 1080i) for
your setup.
For example, a screen resolution of 1080i indicates that the screen shows 1080 lines in an interlaced
display, and 720p indicates that the screens shows 720 lines in a progressive display.
A standard-screen HDTV has a 4x3
aspect ratio. The screen is 4 units wide
for every 3 units tall.
3
A screen resolution of 480i fi lls the
screen.
26
4
A wide-screen HDTV is one-third wider than
a standard-screen HDTV. The screen is 16
units wide for every 9 units tall.
9
A screen resolution of 720p or 1080i
fi lls the screen.
16