Aspect Ratios - Crestron C2N-DVP4DI Reference Manual

Crestron C2N-DVP4DI
Reference Guide – DOC. 6177A
signal that is converted by an internal line-doubler and the DTV has progressive-scan
or component-video outputs; it is also known as EDTV (Enhanced Definition
Television). It is recommend that you use the 480i signal from the DVD (or other
device) that has 480p and allow the C2N-DVP4DI to line-double the signal. The
C2N-DVP4DI has a better line-doubler than most others.
480i - (Composite Video) A form of standard-definition digital television (444:3
aspect ratio, 720 x 480 resolution) that approximates the quality of analog television
but is not considered high-definition television (HDTV). The i stands for interlaced
scanning. Even though the native resolution of DVDs is 480p, they are viewed at
480i on an NTSC or PAL analog television.

Aspect Ratios

Aspect ratio is a number that expresses the proportion of width to height. For
example, a movie screen has an aspect ratio of 1.85:1. Converting the height and
width dimensions to a fraction, and then reducing the fraction to a decimal,
determines the aspect ratio number.
Width divided by height: 20/10.8 = 1.85/1.
Knowing the image height and the aspect ratio, you can calculate the image width.
Figure 1. 4:3 Aspect Ratio
Some other common aspect ratios include 1.33:1 and 1.78:1. These are sometimes
referred to in whole number ratios as 4:3 and 16:9 respectively. The term 4:3 means
that the display is 4 units wide for every 3 units high (or 1.33 units wide for every
one unit high). 4:3 is the aspect ratio of standard television (NTSC); 16:9 is the
aspect ratio of HDTV.
Standard Aspect Ratios
Format
16 mm Film
35 mm Film (before 1953)
35 mm Film (USA)
35 mm Film (Anamorphic)
70 mm Film
NTSC Video
PAL Video
HDTV
Digital Video Processor
Aspect Ratio
1.33
1.33
1.85
2.35
1.85
1.33
1.33
1.78
Digital Video Processor: C2N- DVP4DI • 97