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Resolution (it's math...that works for you)
The crisp, lifelik{' picture that people rave about when {'xpericncing true HI)T\/
iS due tO the resolution this technology provides. The resolution is m{':tsured by
calculating the nmnber of active lines of pixels. A [)ix{'l (which stands for picture
{'h'm{'nt) is a small clot. Tile pictur{, you s{'{' on your T\ / is compos{'d of tiles{'
clots.
A regular, analog television only has a resolution of about 200,000 pixels (480
vertical pixels x 440 horizontal pixels = 211,200 pixels). Tile HDT\/ format is
c:/pable of more than 2 million pixels (i,920 x 1,080 = 2,073,600).
More pixels equal more detail. In summary, HI)T\/ is capable of resolution that
is up to 10 times tile resolution of tile picture on a regular, an:dog T\/!
Feature Analog (NTSC) HD Digital (ATSC)
Total Scan Lines 525 1125
Effective Sc:m Lines 480 1080
Aspect Ratio 4:3 16:9 (Widescreen)
Max Resolution 720 x 480 1920 x 1080
Sound 2-oh Stere() 5.1 ch Surround
16:9 Aspect Ratio
Aspect Ratio
Aspect ratio is simply the width :rod height of th{' picture. Regular TX/s use a 4:3
aspect ratio, which me:ms the picture is a little wider than it is tall (:/screen that
is 20 inches wide is about 15 inches tall).
When tile standards were being developed for television bro:tdc:tsting in 1941
by the NTSC (tile National Television St:mdards Committee), it made sense to
adopt tile 4:3 aspect ratio tile film ind_lstry was using at that time.
As TVs dropped in [)rice :rod people prospered in the 1950s, tile movie industry
had to find a way to get people out of their living rooms and back to the movie
theatres. That's when they created the 16:9 aspect ratio (also called widescreen
fonnat). When tile standards for HI)T\, were being developed by tile ATSC (Ad-
v:mced Television Standards Committee), tile i6:9 aspect ratio was chosen as tile
format for HI)T\/.
This widescreen forinat inak_,s sense bec;/tlSC, it's inl.lch closer to the way we
see. Our field of vision is actually much wider than tall because of our periph-
eral vision. Not only is it closer to the way we see, but tile pictures are crisper
and cleaner with more detail in tile close-up and panoramic views.
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