Philips DA1200 - 11 About DAB

11 About DAB
What is Digital Audio Broadcasting (DAB)?
DAB digital radio is a new way of broadcasting radio via a
network of terrestrial transmitters. It provides listeners with
more choice and information delivered in crystal clear, crackle-
free sound quality.
– The technology allows the receiver to lock on to the strongest
signalitcannd.
– With DAB digital stations there are no frequencies to
remember, and sets are tuned by station name, so there is no
returning on the move.
What is DAB+?
DAB+ is based on the original DAB standard but uses a more
efcientaudiocodec.WhereasDABusesMPEGAudioLayerII
(better known as MP2), DAB+ uses HE-AAC v2 (better known
as MP4 or AAC+). This allows equivalent or better subjective
audio quality to be broadcast at lower bit rates. The increased
efciencyoffersbenetsforGovernmentsandRegulators(even
betterspectrumefciency),broadcasters(lowercostsper
station) and consumers (a wider choice of stations).
DAB+ is designed to provide the same functionality as the
original DAB radio services including services following (e.g.
to the same service on another DAB ensemble or its FM
simulcast),trafcannouncementsandPADmultimediadata(e.g.
dynamic labels such as title artist information or news headlines;
complementary graphics and images etc.)
What is a multiplex?
Digital radio operation is made up of a single block of
frequencies called a multiplex. Each multiplex works within a
frequency spectrum, such as Band III for DAB broadcasts.