H. Schurer
University of Twente
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Featured researches published by H. Schurer.
workshop on applications of signal processing to audio and acoustics | 1995
H. Schurer; Cornelis H. Slump; O.E. Herrmann
High quality sound reproduction by loudspeakers is increasingly problematic if the dimensions of the loudspeaker decrease. To produce enough power, large diaphragm excursions are needed which give rise to significant distortions especially at very low frequencies. Instead of improving the mechanical construction of the transducer we apply a feedforward nonlinear digital inverse circuit. Results of two 2nd order Volterra compensators show a significant reduction of the second order harmonics, leaving higher order distortions unchanged. The structure of the realization influences the performance considerably. Two realization structures are considered, and the error caused by the differentiators in the output of the compensators are compared. Both algorithms are implemented in real-time on a digital signal processor (DSP) for on-line testing with the transducer.
international conference on acoustics, speech, and signal processing | 1997
H. Schurer; Alex G. J. Nijmeijer; Mark A. Boer; Cornelis H. Slump; O.E. Herrmann
Based on a simplified nonlinear lumped element model of the electrodynamic loudspeaker in either a closed or a vented cabinet, a new nonlinear controller is derived, simulated and implemented on a DSP. The Volterra series expansion, a well known functional expansion to model nonlinear systems, is used to estimate the nonlinear parameters from distortion measurements. The controller is directly based on the nonlinear differential equation, and is tested for the case of a low frequency electrodynamic loudspeaker in a closed cabinet. Digital implementation is realized on a general purpose TMS320C30 DSP development board, using the automatic code generation from schematic entry of the Alta-Group SPW software.
Journal of The Audio Engineering Society | 1998
H. Schurer; P. Annema; H. E. de Bree; Cornelis H. Slump; O.E. Herrmann
Journal of The Audio Engineering Society | 1998
H. Schurer; Cornelis H. Slump; O.E. Herrmann
Journal of The Audio Engineering Society | 1996
H. Schurer; Cornelis H. Slump; O.E. Herrmann
european signal processing conference | 1994
H. Schurer; Arthur P. Berkhoff; Cornelis H. Slump; O.E. Herrmann
Journal of The Audio Engineering Society | 1998
Mark A. Boer; Alex G. J. Nijmeijer; H. Schurer; W.F. Druyvesteyn; Cornelis H. Slump; Otto E. Hermann
Proceedings of the ProRISC/IEEE-Benelux Workshop on Circuits, Systems and Signal Processing | 1996
H. Schurer; Cornelis H. Slump; O.E. Herrmann
Proceedings of the ProRISC & IEEE-Benelux workshop on Circuits, Systems and Signal Processing | 1995
H. Schurer; Cornelis H. Slump; O.E. Herrmann
Archive | 1998
T.J.H. Kluter; E.M. Balkema; P.A.R. Lookman; Geert J. Laanstra; Hendrik Kuipers; H. Schurer; Cornelis H. Slump