Katalog Molpir 2018 WEB

Digital Audio Broadcasting
Digital audio broadcasting (DAB) is a digital radio standard for
broadcasting digital audio radio services, used in countries across
Europe, the Middle East and Asia Pacific.
The DAB standard was developed as an European research project in the 1980s and the
first DAB channel in the world NRK Klassisk was started in June 1995 by the Norwegian
Broadcasting Corporation (NRK) followed by BBC and Swedish Radio lanuching their first
DAB broadcasts in September 1995. DAB receivers have been available in many countries
since the end of the 1990s.
DAB is more efficient in means of using radio frequencies spectrum than analogue FM radio
and thus can offer more radio services in given bandwidth. DAB is more robust with regard
to noise and multipathfading for mobile listening, but DAB reception quality degrades
rapidly when the signal strength falls below a critical threshold, whereas FM radio quality
degrades slowly with decreasing signal, providing effective coverage over a larger area.
Original version of DAB uses MP2 audio codec while its upgraded version called DAB+ released in February 2007 uses HE-AAC v2
audio codec. DAB standards are not forward compatible which means that DAB receivers are not able to receive DAB+ broadcasts. DAB+
is approximately twice as efficient as DAB, and it is more robust.
At the end of 2017 already 38 countries were running DAB services with majority of them are using DAB+. It is expected that existing FM
services will switch over to DAB+ soon and again Norway is the leader with switching off the FM analog radio in 2017.
MDAB-008 and MDAB-009A are DAB/DAB+ receivers with FM transmitter to connect to standard car radio. Besides this functionality
these units have Bluetooth for hands-free mobile phone connectivity and MDAB-009A has also RDS function.
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