ABSTRACT
This chapter explores the major digital radio broadcast standards being developed and/or in use outside the U.S., and also provides a brief introduction to satellite radio. In the digital world, the division between television and radio services is becoming increasingly blurred. Systems primarily designed for television can in addition deliver audio services, and some systems originally intended for radio can deliver low-bit rate video services. The terrestrial systems discussed here are restricted to those with a spectrum bandwidth of below 1600 kHz that have been primarily designed to deliver audio services. Most of the systems discussed here are open standards, with the exception of the satellite systems. Only a brief introduction to the proprietary satellite systems is included as full details of their specifications are not publicly available.
