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Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. An iterative leastsquares design method for filters with constrained magnitude response in sound reproduction
 Deutsche Gesellschaft für Akustik DEGA, Berlin: Fortschritte der Akustik. DAGA 2017 : 43. Deutsche Jahrestagung für Akustik, 6.  9. März 2017, Kiel Oldenburg: DEGA, 2017 ISBN: 9783939296126 pp.13471350 
 Deutsche Jahrestagung für Akustik (DAGA) <43, 2017, Kiel> 

 English 
 Conference Paper 
 Fraunhofer IIS () 
Abstract
Filter coefficients determined according to a leastsquares criterion are frequently used in applications related to sound zones and adjustable directivity. Without further constraints, the obtained filter coefficients can exhibit very large frequencydomain magnitudes whenever the underlying optimization problem is illconditioned. To avoid distortion in the loudspeakers during reproduction, the frequency responses of the reproduction filters can be limited in their magnitudes. However, solving the resulting optimization problem is computationally expensive, which constitutes a problem when large filter lengths or a large number of loudspeaker channels are considered. In this contribution, an efficient previously proposed algorithm is modified such that the filter’s magnitude response is constrained. The proposed algorithm uses an approximation in the discrete Fouriertransform domain to yield timedomain filter coefficients. The accuracy of the proposed algorithm is measured by comparing to a stateoftheart approach for convex optimization considering a freefield scenario. Furthermore, the applicability of the results to realworld scenarios is investigated considering measured impulse responses.