Abstract
This chapter discusses broadcasting and how it has evolved over a period of time. The first broadcasts to be made used amplitude modulation (AM). Although better methods of modulation are available today, AM is still in widespread use on the long, medium, and short wave bands. In addition to this, new digital broadcast systems, called digital audio broadcasting (DAB), are being introduced and these are capable of providing even higher quality reproduction than that which can be obtained with VHF FM. Apart from providing improved quality these transmissions can also provide a new range of facilities as they are able to transmit data alongside the audio. The DAB transmissions are also very efficient in their use of spectrum. In view of their resilience to interference it means that adjacent transmitters do not need to use different frequencies as is the case for normal AM and FM services. Instead the same frequency is reused as required to give continuous coverage in what is termed a single frequency network (SFN).
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