Technology

Digital Audio Broadcast

DAB digital radio reception offers a listening experience of close to CD quality. In addition, digital transmission allows an even greater variety of channels and special services: for example, with radio text and slide show (only in conjunction with MMI) you can receive images and other interesting supplementary information in your car.

“Digital radio” is the commercial name for “Digital Audio Broadcasting” or DAB for short, a Europe-wide standard for the digital transmission of radio signals. Digital radio reduces the signals by means of the MPEG-1 compression process with no perceptible sound loss (similar to MP3). As a result, instead of just one channel per frequency, up to nine channels can be broadcast on the same frequency within a so-called ensemble.

Digital radio increases the number of programmes that can be transmitted. These include old, familiar FM stations or new special-interest channels. The service is already available in many European countries.

Two different frequency bands are generally used for digital radio: Band III (174-240 MHz) and the so-called L Band (1,452-1,492 MHz). Band III is usually used by stations broadcasting beyond a local area, e.g. across large regions of the country. The L Band mainly offers local stations with limited coverage (e.g. stations broadcasting to one city). You may be able to receive several different ensembles with different broadcasting ranges at one location.