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II. Basic ideas for HDTV
The basic concept behind HDTV is actually not to increase the definition per unit area ... but rather to increase
the percentage of the visual field contained by the image.
The majority of proposed analog and digital HDTV systems are working toward approximately a 100% increase in the
number of horizontal and vertical pixels. (Proposals are roughly 1 MB per frame with roughly 1000 lines by 1000
horizontal points). This typically results in a factor of 2-3 improvement in the angle of the vertical and horizontal
fields. The majority of HD proposals also change the aspect ratio to 16/9 from 4/3 -- making the image more "movie-like".
The following table summarizes a few of the more conventional analog HD proposals in comparison with existing TV
systems[2]. (Note Grand Alliance and other fully digital proposals are not included in this table.)
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