This document discusses digital audio broadcasting (DAB) technology. It notes that DAB is used for broadcasting radio stations digitally and was developed in European research projects in the 1980s. The signal is converted to digital and transmitted. Some advantages of DAB are that it automatically tunes to available stations and has better sound quality than analog. However, some early DAB radios had poor quality and DAB signals do not always have good coverage. The document also mentions different types of radio broadcasts like live broadcasts, pre-recorded broadcasts, and commercial/private broadcasts. It defines various broadcasting terms.