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An Investigation of a Theoretical Tool for
Predicting Performance of an Active Noise Control System.
Annea Barkefors
,
Simon Berthilsson
and
Mikael Sternad
, Uppsala University.
International Congress of Sound and Vibration, ICSV19
, Vilnius, Lithuania, July 2012.
Annea Barkefors
received a Sir James Ligthhill Best Student Paper Award for this paper.
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Abstract:
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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 sufficient noise suppression is
achieved.
A model-based Linear Quadratic design of a linear
multiple-output feedforward regulator is used to approximate
known noise paths to multiple measurement positions by
the combined secondary paths from the control loudspeakers.
The attainable performance depends on the number and
positioning of the control loudspeakers.
Tools are needed for predicting and understanding the
structural constraints on the attainable performance of the
active control system.
A measure of reproducibility of the primary paths between
a noise source and a control area by a set of control
loudspeakers has been investigated here.
It uses the concept of an effective rank of the control system.
With a given constellation of loudspeakers, the contribution
of each loudspeaker to the possible attenuation of a
disturbance has been analysed and the relationship
between the reproducibility of the primary path and the
achieved attenuation explored.
The insights gained may result in a tool to help car
manufacturers placing loudspeakers with both sound
reproduction and active noise control in mind.
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Related publications:
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Licentiate thesis by Annea Barkefors, May 2014
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Paper at ACC 2012 on feedforward active noise control
design for car interiors
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Paper at ICASSP 2012 on corresponding desing
evaluated in listening rooms.
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Robust Sound Field Control for Audio Reproduction.
A polynomial approach to discrete-time acoustic
modeling and filter design.
PhD Thesis by Lars-Johan Brännmark, 2011.
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Source:
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