In 1935 an electronic system was successfully introduced by a twenty-one year old Philo Taylor Farnsworth.
In 1939 RCA bought a license to use Farnsworths television patterns. They soon began selling five by twelve inch television sets. Very few people had these televisions and those who did watched a blurry picture on a two or three inch screen.
It wasnt until 1953-1955 that television really started to progress and it hasnt stopped since. We have come a long way from 5 by 12 inch television sets. Today some people own televisions with a screen size of 60 inches.
3 What is Digital Television
Digital Television (DTV) refers to transmitting a broadcasting signal by encoding it as zeroes and ones - the digital code used in computers. DTV can be compressed to provide four five or more channels in the same bandwidth required for one channel of the current standard television.
4 How DTV works
. Digital television allows television pictures sound and new data services to be transmitted digitally rather than analog.
The data rate of the digital television is 19.44Mbps in the 6 MHz broadcast television channel. This data rate is similar to telephone modems that have approximately between 28 and 56 Kbps.
5 Costs of Digital TV
Digital television sets are now selling for under 2000. In 1998 they were selling for over 3500. Now in 2004 digital televisions are supposed to drop to around 1400.
6 DTV Statistics
In 2002 unit sales were the following
Projection screens 70.7
169 aspect ratio 54
5.1 decoder 2.6
- ATSC Digital Decoder 13.3
7 Why Switch to DTV
Broadcasters will be able to send more data over the airwaves using the digital signal that can hold more data. This produces a more detailed picture digital quality sound more television channels and new digital only radio channels. Also the sets themselves will be flatter more like movie theater screens.
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