For a new TV, should I buy a wide HDTV screen or a Standard TV (STD) / NTSC screen?
What size screen should I buy?
While I can't make the decision for you, here is some simple math to help you get a handle on the screen size for HDTV versus NTSC.
Reminder: Pythagorean Theorem is a^2 + b^2 = c^2 for right triangles
NTSC aspect ratio is 4:3, forming a 3:4:5 right triangle with diagonal 5.
HDTV aspect ratio is 16:9, the diagonal is SQRT(337) = 18.358
1.224 = 337^0.5/15When upgrading from NTSC to HDTV, use the above scale factor to convert your current NTSC TV diagonal to a HDTV diagonal that will show the same size NTSC image as your old NTSC TV.
0.918 = 337^0.5/20 = 337^0.5*(3/4)/15Use the above scale factor to go from your NTSC TV diagonal to the displayable HDTV diagonal.
0.817 = 15/337^0.5Use the above scale factor to go from your HDTV diagonal to the displayable NTSC diagonal.
¼Empty area on NTSC screen viewing full-width HDTV image
Interestingly enough, the blank area on the screan is 1/4 for either a NTSC TV or an HDTV viewing the other signal.
Here's a handy graph so that you can read off the conversion that you need.
|Selected DTV/HDTV Products and Notes - includes 2003 survey of selected Digital TVs with RGBHV|
related PC/XPC Notes
|HDTV HTPC - record and playback HDTV with DVICO FusionHDTVII tuner card|
|Video Display Resolutions
and Aspect Ratios versus Wallpaper - includes survey, trends, graph, and