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MIMO Design of Active Noise Controllers for Car Interiors:
Extending the Silenced Region at Higher Frequencies.
Simon Berthilsson (Widmark)
,
Annea Barkefors
and
Mikael Sternad
, Uppsala University.
IEEE Automatic Control Conference(ACC),
Montreal, Canada June 2012, pp 6140-6147.
© 2012 IEEE
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Abstract:
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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 single loudspeaker to produce the control signal.
We here
investigate how the spatial volume of control, as well as the
upper limiting frequency, can be increased by using MIMO
feedforward control that uses all loudspeakers of a premium
car HiFi system. The results indicate that performance is
improved for narrowband as well as broadband noise, resulting
in a considerable noise reduction within a 0:3 x 0:3 m area.
Compared to a corresponding SISO design that uses one
loudspeaker and is optimized for one measurement position,
the measured noise damping is improved and the upper limit
frequency for control over the whole area is more than doubled,
from 200 Hz to 450 Hz.
The design requires high-precision
identification of acoustic transfer functions from all involved
loudspeakers as well as accurate modeling of noise paths.
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Related publications:
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PhD Thesis 2018 by Simon Widmark.
Licentiate thesis by Annea Barkefors, May 2014
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Paper at IEEE ICASSP 2012 on the corresponding design
evaluated in listening rooms.
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Paper in IEEE TASLP 2014, describing
the design and performance in more details.
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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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