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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/15392

Title: 音声伝送指標を利用した音声プライバシー保護
Other Titles: Study on method for protecting speech privacy using speech transmission index
Authors: 鵜木, 祐史
Authors(alternative): Unoki, Masashi
Keywords: 音声プライバシー保護
音声伝送指標
変調伝達関数
残響
聴き取りにくさ
Issue Date: 2-Jun-2018
Abstract: 音声プライバシー保護は,オープンスペースにおける音声情報漏えいを防ぐ意味で挑戦的な課題である.しかし,会話音声を不明瞭で聴き取り難くすることはとても難しい.本研究では,漏えい音声を聴取してしまう人の音環境を,後処理した漏えい音声を呈示することで所望の音声伝送指標を得られるように制御し,漏えい音声の明瞭性・聴き取りにくさを能動的に制御する.聴取実験による評価の結果,提案法はSTIを能動的に制御することで漏えい音声の明瞭性を低下させ音声プライバシーを保護可能であることがわかった.また,従来法(マスキング法と残響付与法)と比較して,効果的にプライバシー保護を実現できることもわかった.:Protecting speech privacy is an important challenge in room acoustics. However, protecting people’s conversation from being overheard by an unintended listener, that is, making them not understandable, is difficult. This research study a method for protecting speech privacy by actively controlling the speech transmission index (STI). In this method, the STI in the simulated room can be controlled by manipulating the parameters of the simulated room impulse response (RIR). We can control the STI by convolving speech with the simulated RIR. Word intelligibility and listening difficulty tests were conducted to compare the proposed method with two conventional methods. The results showed that speech privacy can be protected by controlling STI derived by manipulating the simulated RIR. The results also showed that the proposed method can protect the privacy of conversations as effectively as those other methods can by using lower noise levels and shorter reverberation.
Description: 挑戦的萌芽研究
研究期間:2016~2017
課題番号:16K12458
研究者番号:00343187
研究分野:音声信号処理
Language: jpn
URI: http://hdl.handle.net/10119/15392
Appears in Collections:2017年度 (FY 2017)

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