Digital audio broadcast meaning

Digital audio broadcast (DAB/DAB+) describes the terrestrial transmission of radio services in digital form over allocated spectrum, using digital modulation and audio encoding, usually delivered via a multiplex. In legal practice it concerns carriage, licensing, spectrum access and compliance for digital radio services. The term is descriptive; UK legislation predominantly refers to digital sound programme services and radio multiplex services (Broadcasting Act 1996; Communications Act 2003). Ofcom grants radio multiplex licences (including for small-scale DAB) and digital sound programme service licences, and manages spectrum under the Wireless Telegraphy Act 2006. Broadcasters must also comply with the Ofcom Broadcasting Code and related standards. Contractual arrangements typically cover multiplex capacity, bitrate, coverage commitments, service linking and obligations during network changes or reconfiguration. In Ireland, the expression is likewise descriptive. Spectrum licensing is overseen by ComReg and broadcasting regulation by Coimisiún na Meán under the Broadcasting Act 2009. While nationwide DAB is not currently widely deployed, digital radio transmissions and trials fall within this statutory regime. Internet radio and streaming are distinct, as they do not use broadcast spectrum or multiplex licences; analogue AM/FM services are regulated separately. Usage of the term is broadly consistent across England and Wales, Scotland, Northern Ireland and Ireland.