Development of multilingual-multizone generation system

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K21674
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Perceptual information processing; Design science
• Research Institution: National Institute of Information and Communications Technology
• Principal Investigator: Okamoto Takuma 国立研究開発法人情報通信研究機構, 先進的音声翻訳研究開発推進センター先進的音声技術研究室, 研究員 (10551567)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 音場制御 / スピーカアレイ / エリア再生 / 空間フーリエ変換 / マイクロホンアレイ / 音場変換

Outline of Final Research Achievements

This research investigated several sound field control methods based on spatial Fourier transform for realizing multiple sound zones as below. (1) Spatial Fourier transform-based analytical approaches to generating multiple sound zones with a Hann window using linear and circular loudspeaker arrays have been provided and evaluated by using an actually implemented linear array of 64 loudspeakers. (2) Undesired propagation-free sound field control methods have been proposed for sound field synthesis in reverberant environments. (3) Analytical sound field conversion formulations between angular and circular/spherical harmonic spectrums have been derived and applied to generate multiple sound zones.
These results can expect to be useful for not only multilingual-multizone generation but also speech privacy, personal audio and other virtual reality applications.

Free Research Field

音響信号処理