The technology behind radio broadcasts has changed little over the years. Stations still broadcast analog-based FM and AM signals. Digital radio, however, could be the wave of the future, catapulting the medium into the communication revolution. Transmitting a digital rather than an analog signal offers clear sound, interference-free reception and space for dozens of stations in the bandwidth that carries a mere two or three analog equivalents. The technology is so promising that in the United States several groups are scheduled to make digital radio widely available in a year or so. But British broadcasters have beaten the Yanks-and the rest of the world-to the punch.

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