Estimation of acoustic impedances in a room using multiple sound intensities and FDTD method

Yukiko Okawa, Yasuaki Watanabe, Yusuke Ikeda, Yasuhiro Oikawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

To simulate the sound field based on the real environment, it is essential to know the geometry of room and its acoustic impedances. Recently, the geometry of room can be measured easily using measurements such as Mixed Reality (MR) technology and a laser range finder. However, it is not easy to obtain the acoustic impedances on the surface of rooms by in-situ measurements. On the other hand, with the development of numerical simulation technology, the previous studies have proposed a method for estimating acoustic impedances using the recorded signals from the microphones and sound field simulation. However, for practical use, acoustic impedance estimation that is robust to the errors in the measurement positions is required. In our previous works, we also proposed the measurement system of sound intensities using MR technology. The system can quickly measure the multiple sound intensities and visualizes the measurement results as 3DCG in real time at the measurement position. In this study, we propose the estimation method of acoustic impedances of walls using the measurement of sound intensities at multiple points and FDTD simulation. From the simulations experiments with the positional errors in measurement points, the proposed method improved estimation accuracies by about 30 dB compared to the conventional method with time-signals. In addition, the accuracy was improved by about 8 dB by increasing the number of measurement points.

Original languageEnglish
Title of host publication"Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021
EditorsEleonora Carletti, Malcolm Crocker, Marek Pawelczyk, Jiri Tuma
PublisherSilesian University Press
ISBN (Electronic)9788378807995
Publication statusPublished - 2021
Event27th International Congress on Sound and Vibration, ICSV 2021 - Virtual, Online
Duration: 2021 Jul 112021 Jul 16

Publication series

Name"Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021

Conference

Conference27th International Congress on Sound and Vibration, ICSV 2021
CityVirtual, Online
Period21/7/1121/7/16

Keywords

  • Boundary condition
  • Gauss-Newton method
  • Numerical simulation
  • Optimization problem
  • Sound field visualization

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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