Three-dimentional sound field measurement with moving microphone array

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K12049
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 61010:Perceptual information processing-related
• Research Institution: Tokyo Denki University
• Principal Investigator: Ikeda Yusuke 東京電機大学, 未来科学部, 准教授 (80466333)
• Co-Investigator(Kenkyū-buntansha): 及川 靖広 早稲田大学, 理工学術院, 教授 (70333135)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 室内インパルス応答 / マイクロホンアレイ / 音場可視化 / 音場計測 / 等価音源 / 複合現実技術

Outline of Final Research Achievements

We propose methods for restoring and interpolating three-dimensional sound field information using a small amount of microphone measurement information for the purpose of visualizing the sound field. In this study, a dynamic sound field measurement and visualization system using a hand-held microphone array based on mixed reality technology was developed, and a visualization method for impulse response distribution in local area using a small number of microphones and a visualization method of separated reflective-sound using the equivalent source method were established, especially for direct sound and early reflected sound. Furthermore, a multi-channel sound field control method based on the pressure matching method was studied as an application technique using the spatially continuous feature of the model of spatial impulse responses based on measurement information.

Free Research Field

音響信号処理

Academic Significance and Societal Importance of the Research Achievements

音伝搬の物理的特性に着目し、少数計測データから位相情報を含む局所音場情報を復元する手法を確立し、複合現実技術を用いた音場の可視化システムを構築した。少数計測で三次元音場情報を取得可能なため、空間的な音情報が重要となる音響設計、音場制御、騒音対策、音響教育など音響工学分野に広く有効である。また、仮想現実技術を利用することで、音波面の情報を実空間に重畳するという音の新しい表現が実現され、音伝搬のより直感的な画期的なシステムへの応用が可能である。