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Digital feedback control of the frequency response of a conventional loudspeaker
KTH, School of Electrical Engineering (EES), Automatic Control.
2004 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Automatic control design and Hi-Fi loudspeakers are two areas that not very often are combined. In 1976 Karl Erik Ståhl performed a master thesis project at KTH where he, with analog circuits, made a positive feedback loop to manipulate the mechanical parameters of a loudspeaker. That project introduced the idea to use control design when constructing loudspeakers. In this project this idea is pursued.

For a subwoofer, the interesting thing from a control perspective is that it is the low frequency range that has to be controlled as opposed to the high frequency range which is normally the case in disturbance and servo problems. This master thesis project will present a solution to this problem where a digital signal processor is used to handle the feed back information. The IMC controller implemented in the processor is based on models derived from data, measured in the tailor made laboratory set-up that was built for the project. In order to satisfy the sampling rate requirements, the complexity of the control algorithm had to be restricted. Despite this limitation in the equipment, the frequency response of the loudspeaker was improved significantly at low frequencies.

Place, publisher, year, edition, pages
2004. , 36 p.
National Category
Control Engineering
URN: urn:nbn:se:kth:diva-109481OAI: diva2:582546
Subject / course
Automatic Control
Educational program
Master of Science in Engineering
Available from: 2013-01-28 Created: 2013-01-04 Last updated: 2013-01-28Bibliographically approved

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