Wednesday, 1 May 2013

HDTV (High-definition Television)

The first high-definition television sets came into the market in 1998.
Advertisements for these sets showed fantastic resolution and digital surround sound.
It was found that with HDTV, movies could be played in their original widescreen format without the 'black bars' that are found above and below the image.
Many people found after hooking up their HDTV sets, the picture didn't look good, due to the TV not being able to project the high definition.


Image source link.

If you click on the above picture, you can see the super resolution. This is because it is in high-definition.

HDTV has a 16:9 aspect ratio, whereas most standard televisions have a 4:3 ratio.
The highest HDTV resolution is 1920 x 1080 pixels. This is around ten times as many pixels as a standard TV set.
The frame rate for this set usually ends in 'I' or 'P' to announce whether these are interlaced or progressive.
Interlaced display is when a television updates the display twice to show a complete frame.
Progressive display is when a screen updates the image shown only once for each frame of the video.
Progressive displays video at 30 fps and interlaced at 60 fps.

For anything to be watched on the HDTV, a signal is required.
These signals could be acquired from a cable subscription or a satellite service.


http://www.howstuffworks.com/hdtv.htm
http://www.neuron2.net/LVG/interlacing.html

All of the above text and images were sourced from the sources provided in the above links.

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