Iosono is the product name of an audio system presented by the Fraunhofer Institute IDMT and the Iosono GmbH in 2004. It is based on wave field synthesis, a method to use secondary audio sources to recreate primary wave fields, that was developed at Delft University of Technology 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 sound 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. In 2014, Iosono was acquired by Barco. Since 2019 all related IOSONO products and services are available at the newly founded ENCIRCLED company. With the opening up of SWD-IOSONO studio in 2012, the first 3D sound showroom and laboratory using IOSONO technology in China, IOSONO and FULL DIMENSION MULTIMEDIA (Shanghai) Co., Ltd. jointly established IOSONO China to expand its markets in China. Film sound production