Browsing by Author "Kasprzyk, Jerzy"

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Access status: Open Access ,
Control and identification algorithms for acoustic noise reduction
(Wydawnictwa AGH, 2007) Figwer, Jarosław; Czyż, Krzysztof; Główka, Teresa; Kasprzyk, Jerzy; Michalczyk, Małgorzata I.; Pawełczyk, Marek
The aim of the paper is to present main aspects of a research project on active noise reduction being performed at the Computer Control System Group, which is a part of the Institute of Automatic Control, Silesian University of Technology, Gliwice, Poland. In particular, the following problems are dealt with: higher order spectra in off-line and on-line identification of electro-acoustic plants for active noise reduction systems; creating distributed local zones of quiet in a reverberant enclosure using two structures: based on spatially distributed transducers controlled by a central unit or implemented as decentralized systems; development and analysis of optimal and adaptive feedback systems for generating zones of quiet at desired locations; enhancement of active noise reduction efficiency using nonuniform signal sampling and oversampling techniques; design and implementation of a portable multi-channel active noise control platform.
Access status: Open Access ,
Model identification for active noise control in the presence of primary noise
(Wydawnictwa AGH, 2005) Kasprzyk, Jerzy
A problem of electro-acoustic plant identification for active noise control is discussed. It is assumed that data from identification experiment are contaminated by a primary noise that should be attenuated later. Three examples of such a noise are considered: sine (discrete spectrum), noise generated by a motor (narrowband time-varying spectrum) and broadband noise (pseudorandom). It is shown that thanks to preprocessing the data by disturbance adjusting filtration (DAF) it is possible to improve the results significantly when the data are contaminated by a narrowband primary noise. DAF is the procedure of selective filtration in frequency domain consisting in removing from the spectra all lines for frequencies corresponding to the noise. The results of real-world experiments carried on in a laboratory enclosure show the accuracy of estimated frequency responses obtained in the proposed approach. The procedure is efficient when multisine signals are used to excite the plant.
Access status: Restricted ,
Programowanie sterowników przemysłowych
(Wydawnictwa Naukowo-Techniczne, 2017) Kasprzyk, Jerzy