Manual

9
AfterchangingonlythesmallDABortheFMlogoisdisplayedrightnexttothetime.
DAB mode
What is DAB?
DABisanewdigitalformat,throughwhichyoucanhearcrystalclearsoundinCD
quality.DABBroadcastahigh-speeddatastreamintheradiochannel.Indierenceto
conventionalanalogradioDABtransmitsmultiplechannelsonthesametransmitter.
Thisiscalledensembleormultiplexes.Anensembleconsistsoftheradiostationas
well as several service components or data services, which are sent individually by the
radio stations. Learn e.g. under www.digitalradio.de or www.digitalradio.ch.
Data compression
Digital radio uses the of advantages of human hearing. The human ear does not
perceive sounds that are below a certain minimum level. Data which are under the
so-calledthresholdinquietcanbelteredout.Thisispossiblebecauseinadigital
data stream for each information unit, the corresponding relative volume is also saved
for other units. In addition in a sound signal, the quieter portions are overlapped by
the louder for a given threshold. All the sound information in a piece of music that are
belowtheso-calledhearingthresholdcanbelteredoutofthesignaltobetransmit-
ted. This leads to a reduction of the transmitted data stream, without any noticeable
dierenceinsoundtothelistener(MUSICAM)process.
Audio Stream
Audiostreamsarecontinuousdataows,MPEG1AudioLayer2framescontainand
thus represent acoustic information in digital radio. Thus, familiar radio programs can
betransferredandlistenatthereceiverside.ForDigitalradiotheMUSICAMformat
isused,whichprovidestwoMPEGcompliantPADs.ThisisreferredtoasPADdata
services.DigitalRadiobringsyounotonlyradiowitforadditionaldata.Theexcellent