rca DLP HDTV

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HDTV stands for high-definition television. HDTV is the best quality DTV, it has higher resolution: The image on a digital television is made up of small elements called pixels.

HDTV Information:

"Aspect ratio" refers to the ratio of the vertical to horizontal measurements of a television's picture. Mechanically scanned television as first demonstrated by John Logie Baird in 1926 used a 7:3 vertical aspect ratio, oriented for the head and shoulders of a single person in close-up.

Most of the early electronic TV systems from the mid-1930s onward shared the same aspect ratio of 4:3 which was chosen to match the Academy Ratio used in cinema films at the time. This ratio was also square enough to be conveniently viewed on round cathode-ray tubes (CRTs), which were all that could be produced given the manufacturing technology of the time. (Today's CRT technology allows the manufacture of much wider tubes, and the flat screen technologies which are becoming steadily more popular have no aspect ratio limitations at all.) The BBC's television service used a more squarish 5:4 ratio from 1936 to 3 April 1950, when it too switched to a 4:3 ratio.

Australia

Because each broadcaster operates a complete slice of frequency and can therefore provide HDTV at all times of the day if desired, each commercial broadcaster has at some stage provided a high definition demonstration service. This has typically comprised of in-house 15-45 minute loops of purely HD content, sometimes including small clips of shows seen on that network. Network Ten provided a loop January 2001 to December 2002, followed by Network Nine to June 2004, followed by Seven Network to time of writing (2006).

Most purchasers of large screen LCD and Plasma HD sets usually purchase a HD set top 'box' which currently costs around AUD$250 (around USD$200).

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