To investigate the sound absorption of absorber composed a shunt loudspeaker (SL) and porous materials (PM) in tandem, normal coefficients for six samples different groups parameters are measured using impedance tubes. It is shown that composite structure consisting material, an air layer, loudspeaker, layer arranged sequence (PM + Air1 SL Air2) has potential to achieve broadband close three oc...

Computation power to simulate sound fields from the three-dimensional numerical models has progressed fast; for example, using GPU cluster systems. We can render directivity, position , distance, and reverberation of sound sources in a practical time. Furthermore, a multi-channel sound field system can be realized with low-cost digital-to-analog converter modules. Moreover, some researchers are...

Bibliography 184 viii Contents 1 1 Introduction Linear adaptive filtering plays an important role in statistical signal processing and respective theoretical and practical results are well established [23]. In practice, however, nonlinear adaptive filtering often becomes desirable if the considered systems exhibit non-linear behaviour. Acoustic echo cancellation represents an important example ...