[feature] In the last few years digital radio broadcasting has moved beyond the domain of research projects and trials and is beginning to take its place as a serious alternative to analog services in some parts of the world. The term digital radio is used here to refer to digital sound broadcasting systems of various types, including terrestrial and satellite systems. In the United States, in particular, the introduction of terrestrial digital radio has been slowed by a number of delays caused by standardization issues and decisions about audio coding algorithms, although satellite digital radio has been gaining ground for a few years. In parts of Europe and Canada, however, the Eureka 147 World DAB standard has been operating for some time, whereas satellite digital radio (at least for mobile reception) is less common. In the UK, for example, digital radio broadcasts have been on the air from the BBC for many years, although the market penetration of receivers has only recently become significant. In this article we describe the main audio features and differences of the most prominent systems in use.
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