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In 2004 Fraunhofer Institute unveiled Iosono, a new technology for 3D sound. It is partly based on Wave Field Synthesis , a method to use secondary audio sources to recreate primary wave fields, that was developed at Delft Technical University in the Netherlands in the 1980s. Given a 3D audio "picture" of the scene, a specialised algorithm generates secondary sound waves necessary to recreate it in the particular room and then instructs a large number of speakers (300-400) to generate the "audio hologram". While traditional surround systems can only recreate the original 3D sound in a small "sweet spot", Iosono claims it can recreate the original audio in the whole room.