Digital Audio Broadcasting (DAB) is a digital radio technology used in several countries for broadcasting radio stations. Particularly used in Europe, the DAB standard was initiated as a European research project and was launched by BBC in 1995. Since then, DAB receivers have been made available in many countries.
DAB technology offers more radio programs when compared to analogue FM radio, over a specific spectrum. It is more effective with regard to noise and multipath fading for mobile listening, but the reception quality degrades with poor signal strength. FM reception however degrades slowly under similar conditions.
DAB+ is the upgraded version of the system that was released in 2007 that isn’t forward compatible with DAB. With the adoption of AAC+ audio codec, the upgraded version was made twice as efficient as DAB and it could provide high quality audio with as low as 64 kbit/s. Incorporation of Reed-Solomon error correction coding, improved the reception quality of DAB+.
Digital audio broadcasting offers several benefits over analogue systems that include improved end-user features, lower cost, more stations, better reception quality, less pirate interference and variable bandwidth. It uses a wide-bandwidth broadcast technology with specific spectra (Band III and L band) allocated for the purpose.