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Featured researches published by H. Schurer.


workshop on applications of signal processing to audio and acoustics | 1995

Second order Volterra inverses for compensation of loudspeaker nonlinearity

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

Identification and compensation of the electrodynamic transducer nonlinearities

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

Comparison of Two Methods for Measurement of Horn Input Impedance

H. Schurer; P. Annema; H. E. de Bree; Cornelis H. Slump; O.E. Herrmann


Journal of The Audio Engineering Society | 1998

Theoretical and Experimental Comparison of Three Methods for Compensation of Electrodynamic Transducer Nonlinearity

H. Schurer; Cornelis H. Slump; O.E. Herrmann


Journal of The Audio Engineering Society | 1996

Exact Input-Output Linearization of an Electrodynamical Loudspeaker

H. Schurer; Cornelis H. Slump; O.E. Herrmann


european signal processing conference | 1994

Modeling and Compensation of Nonlinear Distortion in Horn Loudspeakers

H. Schurer; Arthur P. Berkhoff; Cornelis H. Slump; O.E. Herrmann


Journal of The Audio Engineering Society | 1998

Audibility of Nonlinear Distortion in Loudspeakers

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

Comparison of Three Methods for Linearization of Electrodynamic Transducers

H. Schurer; Cornelis H. Slump; O.E. Herrmann


Proceedings of the ProRISC & IEEE-Benelux workshop on Circuits, Systems and Signal Processing | 1995

Digital Compensation of Nonlinear Distortion in Loudspeakers

H. Schurer; Cornelis H. Slump; O.E. Herrmann


Archive | 1998

Ontwerp van een echo cancelling in grote ruimten ter verbetering van de spraakverstaanbaarheid

T.J.H. Kluter; E.M. Balkema; P.A.R. Lookman; Geert J. Laanstra; Hendrik Kuipers; H. Schurer; Cornelis H. Slump

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