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THE FUTURE IS NOW!
The different between today’s analog TV and digital HDTV (high definition) will be as dramatic as difference between a CD and a scratchy vinyl record.
Today, when you tune in to a soccer game or the 8 o´clock news, TV stations send the picture and sound signals to your home as a stream of constantly changing radio waves. The nearly square picture is made up of 480 horizontal lines. The result: TV images with a slightly blurry quality. That’s analog TV.
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But when you switch to high-definition TV, the station will use electronic 0s and 1s to send signals to your TV set, just like the information a computer can read. The rectangular picture will be divided into as many as 1,080 lines, creating supersharp screen images. You be able to see incredible detail: the veins on Schwuarzenegger’s muscles or the wrinkles on Lima Duarte’s forehead.
Computer companies want a hole in the future of television. Adding TV to internet services will create a world where people can channel-surf for their favorite shows and surf the Web on one giant computer scream.
You’re going to love digital TV. Stay tuned!
(Adapted from: “Do you want your HDTV?”. In Time for Kids. April 18th. 1997).
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Some others Words (Outras palavras)
For example, a continuous audio signal, transmitted as a sequence of 1s and 0s, can be reconstructed without error provided the noise picked up in transmission is not enough to prevent identification of the 1s and 0s.
Por exemplo, um sinal contínuo de áudio, transmitida como uma sequência de 1s e 0s, pode ser reconstruído sem erros, desde que o ruído captado na transmissão não seja suficiente para impedir a identificação dos 1s e 0s.
Good luck!
