Television has changed dramatically in recent years. You can now sit down in front of a wide, flat-panel screen, and call up hundreds of channels in an instant. You can pause and rewind live broadcasts and record every episode of your favourite programme using a personal video recorder (PVR) such as a TiVo. And in some parts of the world "video on demand" services enable viewers to call up programmes when they want to watch them, rather than when broadcasters decide to transmit them. All this has been made possible by digital technology, which has visibly transformed television. At the same time, however, a similar-if less remarked upon—transformation is under way in radio. It is going digital too.
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