多点制御法を用いた目標方向外音声の低明瞭度化手法

摘要

Multipoint control method is method of playing sound in any direction. Although this method can reduce the sound pressure outside the target direction, there is not significant change in speech quality. Therefore, there is a problem of leakage of the contents of speech. In this report, we propose signal decomposition method by using random vector decomposition and noise-driven decomposition. We also propose noise masking method by applying multi-point control method and studied to be the keeping quality of the target direction and low-articulation of speech in the outside the target direction. We confirmed the low-articulation of speech in outside of target direction.%音を任意の方向に再生する多点制御法は，目標方向外で音圧を低減させることが出来るが，音質に関しては大きな変化がないため，音声内容が漏洩してしまう課題があった．そこで本報告では，ランダムベクトル分解やノイズ駆動分解といった信号分解法，多点制御法を応用したマスキング手法を提案し，目標方向での音質を維持しつつ，目標方向外音声の低明瞭度化を検討した．その結果，目標方向外での音の明瞭度の低下を確認することが出来た．