Yoshiaki Bando, Katsutoshi Itoyama, Masashi Konyo, Satoshı Tadokoro, Kazuhiro Nakadai, Kazuyoshi Yoshii, Tatsuya Kawahara, Hiroshi G. Okuno,
This paper presents a blind multichannel speech enhancement method that can deal with the time-varying layout of microphones and sound sources. Since nonnegative tensor factorization (NTF) separates a multichannel magnitude (or power) spectrogram into source spectrograms without phase information, it is robust against the time-varying mixing system. This method, however, requires prior information such as the spectral bases (templates) of each source spectrogram in advance. To solve this problem, we ...
Tópico(s): Advanced Adaptive Filtering Techniques
2017 - Institute of Electrical and Electronics Engineers | IEEE/ACM Transactions on Audio Speech and Language Processing
Shiho Matsubayashi, Kazuhiro Nakadai, Reiji Suzuki, Tatsuya Ura, Makoto Hasebe, Hiroshi G. Okuno,
Bioacoustics monitoring has become increasingly popular for studying the behavior and ecology of vocalizing birds. This study aims to verify the practical effectiveness of localization technology for auditory monitoring of endangered Eurasian bittern (Botaurus stellaris) which inhabits wetlands in remote areas with thick vegetation. Their crepuscular and highly secretive nature, except during the breeding season when they vocalize advertisement calls, make them difficult to monitor. Because of the ...
Tópico(s): Marine animal studies overview
2022 - Frontiers Media | Frontiers in Robotics and AI
Ethan de Seife, Ken Chen, Gary M. Kramer, Christopher Neilan, Patrick McGilligan,
... Costumes Miyuki Suzuki With Toshiro Mifune (Kingo Gondo), Tatsuya Nakadai (Inspector Tokura), Kyoko Kagawa (Reiko Gondo), Tatsuya Mihashi (Kawanishi), Tsutomo Yamazaki (Takeuchi), Yutaka Sada (Aoki), ...
Tópico(s): Cinema and Media Studies
2010 - Intellect | Film International
Randy Gómez, Tatsuya Kawahara, Kazuhrio Nakadai,
The paper addresses a robust wavelet-based speech enhancement for automatic speech recognition in reverberant and noisy conditions.We propose a novel scheme in improving the speech, late reflection, and noise power estimates from the observed contaminated signal.The improved estimates are used to calculate the Wiener gain in filtering the late reflections and additive noise.In the proposed scheme, optimization of the wavelet family and its parameters is conducted using an acoustic model (AM).In the ...
Tópico(s): Image and Signal Denoising Methods
2015 - Cambridge University Press | APSIPA Transactions on Signal and Information Processing
Yumi Nakadai, Yuichiro Tanioka, Yusuke Yamanaka, Tatsuya Nakagaki,
ABSTRACT The 1923 Kanto earthquake generated not only strong motions that caused a devastating disaster around the metropolitan Tokyo area but also a large tsunami. Although the slip distribution of the 1923 Kanto earthquake has been estimated by several researchers, tsunami waveforms observed at tide gauges near the source have never been used. In this study, the slip distribution of the 1923 Kanto earthquake was estimated using joint inversion of tsunami waveforms and vertical crustal deformations ...
Tópico(s): Seismology and Earthquake Studies
2023 - Seismological Society of America | Bulletin of the Seismological Society of America
Nobuaki Suzuki, Katsumitsu Arai, Saizo Kon, Kayo Yamanaka, Hiroshi Otsuka, Masahiro Koizumi, Noboru Hosaka, Masahiko Tsuchiya, Tomoharu Mochizuki, Tatsuya Kuraishi, Takayuki Murayama, Hideki Tashi, Naoki Oike, Masashi Wakasugi, Yuki Takahashi, Masato Nakadai, Naoto Endo,
Tópico(s): Pharmaceutical Practices and Patient Outcomes
2016 - Springer Science+Business Media | Journal of Bone and Mineral Metabolism