DAB Radio:
DAB or in other words digital audio broadcast is a new way
of broadcasting radio through the use of a network of transmitters. It is
similar to analogue radio but profoundly better, as it provides high quality
material, various new stations and no frequencies, which makes it rather easier
to tune in to different radio stations. Moreover, there are also added
features, such text and pictures.
How does it work: To simply put it DAB radio uses
convergence of two digital technologies in order to provide a reliable radio
broadcasting system with crisp quality?
To explain in detail, DAB provides such quality through the
use of an audio compression system called MPEG. This system reduces the enormous
amount of digital information needed to be broadcast, by removing sounds that
do not and will not be perceived by listeners. For example, quite background
noise that is hidden under loud noise, this is removed by the system as it is
not needed and a waste of digital space. COFDM (Coded Orthogonal Frequency
Division Multiplex) is used to ensure that consistent and strong signals are received,
even in environments that are prone to interference. Through, mathematical
precision, the data signal is divided across 1532 diverse carrier frequencies and
across time. This sort of process ensures that even if some carrier frequencies
are disturbed by interference or signal is affected for some time, listeners will
still be able to receive the original sound.
What are the benefits: To put it simply, listeners have a
much wider choice in radio stations, as DAB uses the radio spectrum more
efficiently than analogue radio, thus making it possible to broadcast a lot
more stations using the same frequency. In addition, sound is greater in
quality through the convergence of the two digital technologies. Lastly, more information
is provided to listeners, as with the efficient use of the radio spectrum,
stations using DAB radio can increase information put on broadcast, for
example, some stations already have broadcast the latest news, weather and
travel.
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