Speech Enhancement Using Nonlinear Microphone Array Based on Complementary Beamforming (Special Section on Digital Signal Processing)
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概要
- 論文の詳細を見る
This paper describes a spatial spectral subtraction method by using the complementary beamforming microphone array to enhance noisy speech signals for speech recognition. The complementary beamforming is based on two types of beamformers designed to obtain complementary directivity patterns with respect to each other. In this paper, it is shown that the nonlinear subtraction processing with complementary beam-forming can result in a kind of the spectral subtraction without the need for speech pause detection. In addition, the optimization algorithm for the directivity pattern is also described. To evaluate the effectiveness, speech enhancement experiments and speech recognition experiments are performed based on computer simulations under both stationary and nonstationary noise conditions. In comparison with the optimized conventional delay-and-sum (DS) array, it is shown that: (1) the proposed array improves the signal-to-noise ratio (SNR) of degraded speech by about 2 dB and performs more than 20% better in word recognition rates under the conditions that the white Gaussian noise with the input SNR of -5 or -10 dB is used, (2) the proposed array performs more than 5% better in word recognition rates under the nonstationary noise conditions. Also, it is shown that these improvements of the proposed array are same as or superior to those of the conventional spectral subtraction method cascaded with the DS array.
- 社団法人電子情報通信学会の論文
- 1999-08-25
著者
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TAKEDA Kazuya
Department of Nuclear Engineering, School of Engineering, Tokai University
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Takeda K
Nagoya Univ. Nagoya Jpn
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Takeda Kazuya
Department Of Information Electronics Graduate School Of Engineering Nagoya University
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SARUWATARI Hiroshi
Department of Dermatology, Kagoshima University Graduate School of Medical and Dental Sciences
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Kajita S
Center For Information Media Studies Nagoya University
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Takeda K
Center For Integrated Acoustic Information Research Graduate School Of Engineering Nagoya University
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SARUWATARI Hiroshi
Graduate School of Information Science, Nara Institute of Science and Technology
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Saruwatari Hiroshi
Graduate School Of Information Science Nara Institute Of Science And Technology
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Saruwatari Hiroshi
Department Of Dermatology Kagoshima University Graduate School Of Medical And Dental Sciences
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Saruwatari H
Graduate School Of Information Science Nara Institute Of Science And Technology
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ITAKURA Fumitada
Center for Information Media Studies, Nagoya University
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Itakura F
Graduate School Of Information Engineering Meijo University
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Itakura Fumitada
Center For Information Media Studies Nagoya University
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KAJITA Shoji
Center for Information Media Studies, Nagoya University
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