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Active noise control is of increasing interest in e.g. cars, but the zone of noise damping becomes limited in reverberant environments. We investigate the possibility of extending this spatial zone significantly, by using multiple control loudspeakers. MIMO feedforward controllers designed by linear quadratic control theory are here shown to increase the(More)
— Active Noise Control can provide damping of low-frequency noise in car compartments by feedforward or feedback control. The complicated sound field in reverberant environments limits the spatial volume of efficient sound control. At higher frequencies, damping is in general possible only within a small volume around a control microphone when using a(More)
A method for sound field control applied to active noise control is presented and evaluated. The method uses Linear Quadratic Gaussian (LQG) feedforward control to find a Minimal Mean Square Error (MMSE)-optimal linear sound field controller under a causality constraint. It is obtained by solving a polynomial matrix spectral factorization and a linear(More)
Active noise control is a topic of increasing interest for car manufacturers. In the lower frequency range, active control could relax the need for sound insulating materials, leading to lighter vehicles with lower fuel consumption. Here, we investigate further the possibility of using multiple loudspeakers with the aim of enlarging the spatial zones where(More)
This thesis is based on the following papers, which are referred to in the text by their Roman numerals. "Extending the area silenced by active noise control using multiple loudspeakers," "MIMO design of active noise controllers for car interiors: extending the silenced region at higher frequencies," Presented at the investigation of a theoretical tool for(More)
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