Richard Antoine, Fernandez-Grande Efren, Brunskog Jonas, Jeong Cheol-Ho
Acoustic Technology, Department of Electrical Engineering, Technical University of Denmark (DTU), Building 352, Ørsteds Plads, DK-2800 Kongens Lyngby, Denmark.
J Acoust Soc Am. 2017 Jun;141(6):4115. doi: 10.1121/1.4983756.
A method is proposed to estimate the surface impedance of a large absorptive panel from free-field measurements with a spherical microphone array. The method relies on the reconstruction of the pressure and the particle velocity on the studied surface using an equivalent source method based on spherical array measurements. The sound field measured by the array is mainly composed of an incident and a reflected wave, so it can be represented as a spatially sparse problem. This makes it possible to use compressive sensing in order to enhance the resolution and the quality of the estimation. The results indicate an accurate reconstruction for angles of incidence between 0° and 60°, and between approximately 200 and 4000 Hz. Additionally, experimental challenges are discussed, such as the sample's finiteness at low frequencies and the estimation of the background noise.
提出了一种通过使用球形麦克风阵列进行自由场测量来估计大型吸声板表面阻抗的方法。该方法基于球形阵列测量，利用等效源法重建研究表面上的压力和粒子速度。阵列测量的声场主要由入射波和反射波组成，因此可以表示为一个空间稀疏问题。这使得利用压缩感知来提高估计的分辨率和质量成为可能。结果表明，在0°至60°的入射角以及大约200至4000 Hz的频率范围内能够进行准确的重建。此外，还讨论了实验挑战，例如低频下样本的有限性以及背景噪声的估计。
