Experiments on a multiple loudspeaker 3D audio system for reproduction of sound fields captured with a spherical microphone array

2021 ◽  
Author(s):  
Nuno Vieira ◽  
Octavio Inacio ◽  
Jose Meireles
Keyword(s):  
Microphone Array ◽  
Sound Fields ◽  
3D Audio ◽  
Audio System

scholarly journals Regularised reconstruction of sound fields with a spherical microphone array

2013 ◽  
Author(s):  
Alba Granados ◽  
Finn Jacobsen ◽  
Efren Fernandez-Grande
Keyword(s):  
Microphone Array ◽  
Sound Fields

Synthetic Sound Source Generation for Acoustical Measurements in Turbomachines

2013 ◽  
Author(s):  
Michael Bartelt ◽  
Juan D. Laguna ◽  
Joerg R. Seume
Keyword(s):  
Wind Tunnel ◽  
Sound Source ◽  
Sound Propagation ◽  
Microphone Array ◽  
Sound Field ◽  
Acoustic Mode ◽  
Acoustic Excitation ◽  
Noise Emission ◽  
Noise Sources ◽  
Sound Fields

One of the greatest challenges in modern aircraft propulsion design is the reduction of the engine noise emission in order to develop quieter aircrafts. In the course of a current research project, the sound transport in low pressure turbines is investigated. For the corresponding experimental measurements, a specific acoustic excitation system is developed which can be implemented into the inlet of a turbine test rig and into an aeroacoustic wind tunnel. This allows for an acoustic mode generation and a synthesis of various sound source patterns to simulate typical turbomachinery noise sources such as rotor-stator interaction, etc. The paper presents the acoustical and technical design methodology in detail and addresses the experimental options of the system. Particular attention is paid to the design and the numerical optimization of the acoustic excitation units. To validate the sound generator during operation, measurements are performed in an aeroacoustic wind tunnel. For this purpose, an in-duct microphone array with a specific beamforming algorithm for hard-walled ducts is developed and applied to identify the source locations. The synthetically excited sound fields and the propagating acoustic modes are measured and analyzed by means of modal decomposition techniques. The measurement principles and the results are discussed in detail and it is shown that the intended sound source is produced and the intended sound field is excited. This paper shall contribute to help guide the development of excitation systems for aeroacoustic experiments to better understanding the physics of sound propagation within turbomachines.

Development of decomposition method of flow and sound fields around vehicle using MEMS microphone array

2019 ◽  
Vol 2019 (0) ◽  
pp. IS-04
Author(s):  
Kenta MIZUSHIRI ◽  
Tsukasa YOSHINAGA ◽  
Hiroshi YOKOYAMA ◽  
Akiyoshi IIDA
Keyword(s):  
Decomposition Method ◽  
Microphone Array ◽  
Sound Fields ◽  
Mems Microphone
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