18-02-2010, 01:43 PM
Digital Audio Broadcasting (DAB), is a digital radio technology for broadcasting radio stations. It offers more radio programmes over a specific spectrum than analogue FM radio.An upgraded version of the system is DAB+ which can can provide high quality audio with as low as 64kbit/s.
Sound quality
The DAB aims at higher fidelity, more stations and more resistance to noise, co-channel interference and multipath than in analogue FM radio.But the present audio quality is becomes lower than sound quality in non-mobile FM reception because of the compression.
Benefits of DAB
-Improved end-user features:
DAB radios automatically tune to all the available stations, offering a list of all stations.
-More stations:
it is more rubust to co-channel interference (cross talk), which makes it possible to reduce the reuse distance, i.e. use the same radio frequency channel more densly though it is not more bandwidth efficient than analogue measured in programmes per MHz.
Lower cost:
Multiplexing is possible ie, many channels over one transmitter which lowers maintenance and transmission costs radically when compared to FM.
Reception quality:
multipath fading and signal noise are compensated for resuloting in better reception.
-Less pirate interference:
pirate radio stations broadcasting on DAB are less due to the specialised nature and cost of DAB broadcasting equipment.
Visit :
http://en.wikipediawiki/Digital_Audio_Broadcasting
for a report on DAB,
http://ebu.ch/en/technical/trev/trev_279-kozamernik.pdf
Sound quality
The DAB aims at higher fidelity, more stations and more resistance to noise, co-channel interference and multipath than in analogue FM radio.But the present audio quality is becomes lower than sound quality in non-mobile FM reception because of the compression.
Benefits of DAB
-Improved end-user features:
DAB radios automatically tune to all the available stations, offering a list of all stations.
-More stations:
it is more rubust to co-channel interference (cross talk), which makes it possible to reduce the reuse distance, i.e. use the same radio frequency channel more densly though it is not more bandwidth efficient than analogue measured in programmes per MHz.
Lower cost:
Multiplexing is possible ie, many channels over one transmitter which lowers maintenance and transmission costs radically when compared to FM.
Reception quality:
multipath fading and signal noise are compensated for resuloting in better reception.
-Less pirate interference:
pirate radio stations broadcasting on DAB are less due to the specialised nature and cost of DAB broadcasting equipment.
Visit :
http://en.wikipediawiki/Digital_Audio_Broadcasting
for a report on DAB,
http://ebu.ch/en/technical/trev/trev_279-kozamernik.pdf
