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Faculté des Sciences appliquées
Faculté des Sciences appliquées
MASTER THESIS
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Evaluation of the accuracy of measurements performed by a spherical array of microphones

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Barreiro Sanchez, Iratxe ULg
Promotor(s) : Embrechts, Jean-Jacques ULg
Date of defense : 27-Jun-2016/28-Jun-2016 • Permalink : http://hdl.handle.net/2268.2/1442
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Title : Evaluation of the accuracy of measurements performed by a spherical array of microphones
Translated title : [es] Evaluación de la precisión de medidas realizadas mediante un array esférico de micrófonos
Author : Barreiro Sanchez, Iratxe ULg
Date of defense  : 27-Jun-2016/28-Jun-2016
Advisor(s) : Embrechts, Jean-Jacques ULg
Committee's member(s) : Verly, Jacques ULg
Vanderbemden, Philippe ULg
Language : English
Number of pages : 56
Keywords : [en] Microphone
[en] Array
[en] Spherical
[en] Impulse Response
[en] Directional
Discipline(s) : Engineering, computing & technology > Electrical & electronics engineering
Institution(s) : Université de Liège, Liège, Belgique
Degree: Cours supplémentaires destinés aux étudiants d'échange (Erasmus, ...)
Faculty: Master thesis of the Faculté des Sciences appliquées

Abstract

[en] This Master’s thesis consists in evaluating a spherical microphone array developed in a previous project, which will be referred to later, that aimed to extract 3D Room Impulse Responses with a measurement system composed of the referred microphone, among other tools. We will focus on the accuracy of localization of the sound as a direct continuation of the previous work. It could be considered as the main application of this system, hence it is important to emphasize the need of this evaluation.
The measurement system consists of a spherical antenna containing 16 microphones, two cards with 8 channels each and the associated signal treatment. Adobe Audition and the Matlab software are used in order to process the information which is provided by the measurement system.
The current aim is to evaluate the precision provided by the system, which is evaluated in several situations. Different acoustics measurements have been taken in an anechoic room and also in a reverberant room. A calibration task can be found and additionally, the first measurements with their corresponding analysis are presented. After that, measurements with pure tones and impulse responses have carried out. In both parts, we focus on the horizontal plane. We introduce the diffuse field measurements using pure tones and pink noise.
Then we treat the recorded information to show different diagrams obtained by different beamforming methods. I conclude that there are some unusual results but the microphone array works. The experimental study includes capturing the impulse responses and evaluating of different types of beamforming. We conclude that PWD beamforming works badly in the measurements of this project. We can also say that the sound field in the reverberant room is not really diffuse.


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Author

  • Barreiro Sanchez, Iratxe ULg Université de Liège > conv. Erasmus en sc. appl.

Promotor(s)

Committee's member(s)

  • Verly, Jacques ULg Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Exploitation des signaux et images
    ORBi View his publications on ORBi
  • Vanderbemden, Philippe ULg Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
    ORBi View his publications on ORBi
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