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High Definition Television

HD Television or HDTV is the latest type of modern television. It is a high-resolution digital television (DTV). Its superior audio quality is powered by Dolby Digital surround sound AC-3 system. It was first conceptualized in the 1970s in Japan. Its foremost developers were Sony and NHK who later developed the NHK Hi-vision system, the father of the modern HD Television. This method creates pictures just like a 35 mm film. As a result, TV programs recording, playing, and editing are much more convenient and time-efficient.

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At present, HD Television offers greater picture and audio quality than ordinary TV. Some of HDTVs upgraded features include its digital advantage, remarkable detail, and progressive scanning. Ordinary and traditional TV sets have only 4:3 aspect ratios while HDTV has 16:9; that is 33% broader. This makes the image viewing much wider and more comprehensive like a theater system. Aside from this, HDTVs screen resolution has 1920 (horizontal) x 1080 (vertical) pixels compared to an ordinary TVs 210,000 pixels per image. This makes the image enhancement 10 times sharper and more detailed. Multicasting (the sending of more than one signal over a similar channel) is also possible when using HD Television.

HD Television uses 3 different kinds of broadcast formats. These are the 720p (which has 1280 x 720 pixels progressive), the 1080i (which has 1920 x 1080 pixels interlaced), and the 1080p (which has 1920 x 1080 pixels progressive). These formats are associated with the HDTVs scanning system.

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HD Televisions audio superiority offers 5.1 channels of CD-quality surround sound from different directions and frequency levels. These include the left, right, center, left rear, right rear, and low frequency effects. The so-called ghost images of the standard NTSC television is totally diminished in the HDTV system. Blurry and snowy receptions are also reduced when using HDTV.

Widescreen HDTV

Typically, a widescreen HDTV has a 16:9 (1.78:1) aspect ratio monitor. Its widescreen format usually decodes a digital standard-definition picture by anamorphically compressing it. It is generally used along with the 720p/1080i HDTV broadcasts and widescreen DVD disks.

Widescreen HDTVs are highly compared with the 4:3 TV sets. This is because a 4:3 TV is more familiar and popular among American households than widescreen HDTV. However, during the past two years, the number of widescreen HDTV items bought by American consumers was doubled despite its expensive pricing. Its average price tag is between $700 to $2000 depending on its screen size and functionality. In fact, a widescreen TV set cost more per square inch of screen size than an ordinary TV. Nevertheless, a widescreen HDTV has lots of advantages to offer. One improvement is the enhancement of the letterbox bars V the black bars on the edge of a TV. Widescreen HDTV can stretch, crop, or zoom a 4:3 display so that it occupies entirely the screen. The widescreen HDTVs menus include the Normal or 4:3, the Zoom or Enlarge, the Wide or Full, and the Panorama, TheaterWide, & Natural.

The Normal mode lets letterbox bars or windowbox bars displayed on a 4:3 screen. The Zoom or Enlarge style gets rid of the letterbox bars therefore expanding an images size. However, this method crops the images top and bottom areas. The Wide or Full mode is mainly applied for early 16:9 element such as that found on DVDs. The Panorama, TheaterWide, and Natural modes are the manufacturer-defined screen settings. It lets images stretched, zoomed, centered, and cropped.

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Archimedes HDTV Guide and Shop 2010