Digital television is fasting adding a new paradigm to the future of television. With the advent of audio and video compression it is possible to transmit and receive broadband data over co-axial cable and through satellite and terrestrial. Digital modulation data, which is digitally compressed and requires decoding by a specially designed television set or a standard receiver with a set-top box. For all delivery mechanism a digital set-top box is needed at the customer's premises. It receives the digital transmission and decodes video, audio programs to display on normal Television Receiver.
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http://en.oboulo.com/motion-picture-compression-technique-used-in-digital-television-sets-65032.html
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