Digital Audio Broadcasting (DAB) +
Postitatud: 08:54, 08 Veebr 2012
DAB+ (DAB Upgrade 2007)
DAB projektiga alustati juba 1980,esimesed saated 1995 Norras ja UK-s(BBC).
2007 alustas DAB Upgrade ehk DAB+.
DAB+ will be able to provide far higher audio quality or far more stations than they can on DAB.
FM:
-Analog FM requires 0.2 MHz per programme.
-total availability of 102 FM channels at a bandwidth of 0.2MHz over the Band II spectrum of 87.5 to 108.0 MHz
DAB+
-3.2 times as efficient as analog FM for local stations
-DAB+ for SNF transmission is 12.7 times as efficient as FM for national and regional networks.
-DAB has a number of country specific transmission modes (I, II, III and IV). For worldwide operation a receiver must support all 4 modes.
-The capacity of a DAB multiplex is fixed, so the more efficient the audio codec is, the more stations can be carried.
-A survey of DAB listeners (including mobile) has shown most find DAB to have equal or better sound quality than FM.
-DAB coverage is poor in nearly all countries in comparison to the high population coverage provided by FM.
-Saksas on asi väga kiiresti arenenud ja toimib :
27 transmitters covering the major towns, cities & motorways (autobahns) are now on-air in Germany.
Population coverage from the 1st August 2011 is approximately 40 million people with planned coverage reaching 99% of the population by 2014.
olukord maailmas (30.01.2012)
http://www.worlddab.org/country_information_
Eesti:
Current situation in Estonia
Last update: 24-08-2010
Estonia has been carrying out experimental DAB broadcasts since 2000. There were four DAB programmes available on the multiplex of the Eesti Rahvusringhääling (ERR) the Estonian Public Broadcaster though no information is currently available on whether these services remain on trial.
DAB projektiga alustati juba 1980,esimesed saated 1995 Norras ja UK-s(BBC).
2007 alustas DAB Upgrade ehk DAB+.
DAB+ will be able to provide far higher audio quality or far more stations than they can on DAB.
FM:
-Analog FM requires 0.2 MHz per programme.
-total availability of 102 FM channels at a bandwidth of 0.2MHz over the Band II spectrum of 87.5 to 108.0 MHz
DAB+
-3.2 times as efficient as analog FM for local stations
-DAB+ for SNF transmission is 12.7 times as efficient as FM for national and regional networks.
-DAB has a number of country specific transmission modes (I, II, III and IV). For worldwide operation a receiver must support all 4 modes.
-The capacity of a DAB multiplex is fixed, so the more efficient the audio codec is, the more stations can be carried.
-A survey of DAB listeners (including mobile) has shown most find DAB to have equal or better sound quality than FM.
-DAB coverage is poor in nearly all countries in comparison to the high population coverage provided by FM.
-Saksas on asi väga kiiresti arenenud ja toimib :
27 transmitters covering the major towns, cities & motorways (autobahns) are now on-air in Germany.
Population coverage from the 1st August 2011 is approximately 40 million people with planned coverage reaching 99% of the population by 2014.
olukord maailmas (30.01.2012)
http://www.worlddab.org/country_information_
Eesti:
Current situation in Estonia
Last update: 24-08-2010
Estonia has been carrying out experimental DAB broadcasts since 2000. There were four DAB programmes available on the multiplex of the Eesti Rahvusringhääling (ERR) the Estonian Public Broadcaster though no information is currently available on whether these services remain on trial.
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