Crestron HD-DA-2-QUAD Specifications download pdf (Page 76)

Crestron DigitialMedia

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Design Guide

Video Display Terminology

Aspect Ratio

The ratio of width to height in a video picture or other graphic image. Traditional U.S. TV broadcasts and computer monitors

feature a 4:3 aspect ratio; HDTV has a 16:9 ratio.

16:9

Sometimes expressed as 16 x 9 or 16 by 9 (known as 1.78:1 in the film world). The standard DTV widescreen television

screen size, or aspect ratio, which is 16 arbitrary units wide by nine arbitrary units high, as compared to a standard TV aspect

ratio of 4:3. The phrase describes the shape of a TV set or program, not an actual inch measurement.

4:3

Standard “square” NTSC TV screen size aspect ratio of four arbitrary units wide by three wide arbitrary units high; often

expressed as 4x3 or 4 by 3. It was originally known as the Academy Ratio (as in Academy of Motion Picture Arts and

Sciences, the film industry organization that awards the Oscars) prior to 1954 and the introduction of widescreen aspect ratio

film formats; also known in the film world as 1.33:1.

Anamorphic

Adopted from the film technique of shooting a widescreen image on a square 35mm frame, it›s the process of compressing

widescreen images to fit into the squarer standard 4:3 television signal. The images are then expanded for viewing in their

original format on a widescreen display device. Widescreen or letterboxed DVDs that are not anamorphic have less detail

when projected on a widescreen monitor. In other words, a non-anamorphic widescreen DVD is designed to be shown letter-

boxed on a standard “square” TV but appears with a black box all around the image when shown on a larger 16:9 widescreen

TV. To fill a 16:9 screen, a non-anamorphic DVD has to be stretched, resulting in loss of resolution and detail. Conversely, a

DVD that is anamorphic, enhanced for 16:9, or enhanced for widescreen, delivers 33 percent more resolution than regular

letterboxed transfers. It was designed to be shown on a 16:9 TV, and does not need to be manipulated to fit. When one of

these DVDs is shown on a “square” TV, it is often subject to anamorphic down-conversion artifacts unless the

TV has a vertical compression feature.

Anamorphic down-conversion

Processing present in all DVD players that converts the image from an anamorphic DVD for display on a regular 4:3 TV.

In the initial setup of a DVD player is a choice between a 16:9 or a 4:3 TV; the 4:3 options engage this processing,

which often introduces artifacts such as jaggies and undulations during pans.

Component video

The elements that make up a video signal, consisting of luminance and two separate chrominance signals, expressed either

as Y R-Y B-Y or Y P

DisplayPort

A digital display interface standard put forth by the Video Electronics Standards Association (VESA) that defines a new

license-free, royalty-free, digital audio/video interconnect, intended to be used primarily between a computer and its display

monitor or a computer and a home theater system.

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Crestron HD-DA-2-QUAD Specifications Page 76