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On the array configuration and accuracy of remote in-ear level sensing for in-vehicle noise control applications

Mirjana Adnadjevic (UGent) , Bart Goossens (UGent) and Dick Botteldooren (UGent)
(2018) APPLIED ACOUSTICS. 129. p.229-238
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Abstract
Measuring in the ear of the operator of a vehicle may be useful in several applications such as noise assessment, adaptive communication, or active noise control. However, wearing in-ear microphones is not very comfortable. This work proposed a design methodology for an array-based-virtual microphone for remote in-ear level sensing. To extend the sensing capabilities of current virtual microphone methods, a method that besides robust filter design also includes microphone placement optimization is proposed. Motivated by the recent progress in sparse signal processing, an unconstrained optimization is proposed which keeps the fidelity of in-ear level while reducing the number of initial active microphones through the log-sum-sparsity-induced regularization term. It has been compared to several screening methods which are optimizing for system diversity and are often used for optimal sensor placement. To study the importance of microphones being locally placed around the ears, several methods to maximize the system redundancy are also evaluated. The selection approach based on the sparsity coding theory achieves the best remote sensing performance with the least number of microphones. It results in the array configuration which balances well between the local (around the head) and global placement (throughout the vehicle roof). Sensitivity of the design to the natural head movements of 20 and 45 degrees is assessed, showing an improved system robustness by accounting for those variations in the design. (C) 2017 Elsevier Ltd. All rights reserved.
Keywords
SOUND QUALITY, SENSOR PLACEMENT, VIRTUAL SENSORS, Virtual microphone, Microphone selection, Regularization, Optimization, Sparse signal processing

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Chicago
Adnadjevic, Mirjana, Bart Goossens, and Dick Botteldooren. 2018. “On the Array Configuration and Accuracy of Remote In-ear Level Sensing for In-vehicle Noise Control Applications.” Applied Acoustics 129: 229–238.
APA
Adnadjevic, M., Goossens, B., & Botteldooren, D. (2018). On the array configuration and accuracy of remote in-ear level sensing for in-vehicle noise control applications. APPLIED ACOUSTICS, 129, 229–238.
Vancouver
1.
Adnadjevic M, Goossens B, Botteldooren D. On the array configuration and accuracy of remote in-ear level sensing for in-vehicle noise control applications. APPLIED ACOUSTICS. Oxford: Elsevier Sci Ltd; 2018;129:229–38.
MLA
Adnadjevic, Mirjana, Bart Goossens, and Dick Botteldooren. “On the Array Configuration and Accuracy of Remote In-ear Level Sensing for In-vehicle Noise Control Applications.” APPLIED ACOUSTICS 129 (2018): 229–238. Print.
@article{8546964,
  abstract     = {Measuring in the ear of the operator of a vehicle may be useful in several applications such as noise assessment, adaptive communication, or active noise control. However, wearing in-ear microphones is not very comfortable. This work proposed a design methodology for an array-based-virtual microphone for remote in-ear level sensing. To extend the sensing capabilities of current virtual microphone methods, a method that besides robust filter design also includes microphone placement optimization is proposed. Motivated by the recent progress in sparse signal processing, an unconstrained optimization is proposed which keeps the fidelity of in-ear level while reducing the number of initial active microphones through the log-sum-sparsity-induced regularization term. It has been compared to several screening methods which are optimizing for system diversity and are often used for optimal sensor placement. To study the importance of microphones being locally placed around the ears, several methods to maximize the system redundancy are also evaluated. The selection approach based on the sparsity coding theory achieves the best remote sensing performance with the least number of microphones. It results in the array configuration which balances well between the local (around the head) and global placement (throughout the vehicle roof). Sensitivity of the design to the natural head movements of 20 and 45 degrees is assessed, showing an improved system robustness by accounting for those variations in the design. (C) 2017 Elsevier Ltd. All rights reserved.},
  author       = {Adnadjevic, Mirjana and Goossens, Bart and Botteldooren, Dick},
  issn         = {0003-682X},
  journal      = {APPLIED ACOUSTICS},
  keyword      = {SOUND QUALITY,SENSOR PLACEMENT,VIRTUAL SENSORS,Virtual microphone,Microphone selection,Regularization,Optimization,Sparse signal processing},
  language     = {eng},
  pages        = {229--238},
  publisher    = {Elsevier Sci Ltd},
  title        = {On the array configuration and accuracy of remote in-ear level sensing for in-vehicle noise control applications},
  url          = {http://dx.doi.org/10.1016/j.apacoust.2017.08.004},
  volume       = {129},
  year         = {2018},
}

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