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• アナログ集積回路

  アナログ集積回路  

  研究期間： 2010年04月  -  継続中

• 再構成可能なデータコンバータ

  再構成可能なデータコンバータ回路  

  研究期間： 2008年04月  -  継続中

• 生体信号センサーの開発

  味覚センサー,システムLSI,アナログ回路  

  研究期間： 2007年04月  -  継続中

• 確率共鳴法による信号処理

  信号処理,確率共鳴,アナログ回路  

  研究期間： 2015年04月  -  継続中

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• Discussion on differences in frequency band required for horizontal sound localization by age

  Okuno T., Hirakawa R., Kawano H., Nakashi K., Nakatoh Y.

  ACM International Conference Proceeding Series      2019年05月  [査読有り]

   概要を見る

  © 2019 Association for Computing Machinery. In this paper, the horizontal sound image experiment of the real sound source was performed under the head resting condition using the band - limited noise using the low pass filter and the band pass filter. Then, the effect of each frequency band on direction perception of the hearing person and the elderly person was clarified. Five people with healthy men in their twenties and five elderly people in their 70s male hearing white noise pass through low-pass filters (2, 3, 4, 5, 6 kHz) and band-pass filters (1-4, 2-4, 2-5 [kHz]) passed through the directional perception experiment. As a result, similarly to the previous study [1], it is difficult to perceive directions sufficiently if two or more frequency bands are included, and it is difficult to perceive the direction of band-pass noise through a band-pass filter of a narrow frequency band. As a result of this research, Direction perception was found that the frequency band around 4 [kHz] and 6 [kHz] is small as an element of direction perception and the frequency band around 5 [kHz] is an important clue for direction perception.

  DOI Scopus

• Examination of acoustic features for discriminating between real and loudspeaker speeches

  Kinoshita Y., Hirakawa R., Kawano H., Nakashi K., Nakatoh Y.

  ACM International Conference Proceeding Series      2019年05月  [査読有り]

   概要を見る

  © 2019 Association for Computing Machinery. In the train while driving, there are many noises such as noises from the vibration of the vehicle and the shock noise generated at the vehicle connection, and the roar of human beings, etc. In addition to stressing the passengers, these noises it prevents you from listening to the announcements in the train. In this paper, a new noise canceling earphone system aimed at improving in-car announcement speech listening and reducing stress that the noise gives to passengers by separating surrounding speech and in-train announcement speech regarded as noise I devised. In this study, as a preliminary step to complete the system, in order to find the difference between the ambient speech and the announcement speech such as the roar of the passenger, both speeches were compared using acoustic features. As a result, among the acoustic features used in the comparison, differences were found in the spectral centroid, the spectral roll-off, and the intensity and spectral contrast when divided into sub-bands.

  DOI Scopus

• In load collapse prevention system Examination of the relationship between truck vibration and load inclination

  Inoshita C., Hirakawa R., Kawano H., Nakashi K., Nakatoh Y.

  ACM International Conference Proceeding Series      2019年05月  [査読有り]

   概要を見る

  © 2019 Association for Computing Machinery. ACM In recent years, the demand for the logistics industry has increased enormously due to the spread of Internet mail order. On the other hand, the number of fatal accidents caused by trucks is more than 10,000 a year in Japan. Above all, there is a problem that there is an annual fatal and fatal accident due to truck load collapse. In this study, using the drive recorder, we calculated the inclination of the package photographed during driving by using KCF of object tracking method of image processing. Comparing the change of the Luggage tilt and the amount of change in 3-axis acceleration attached to the vehicle/ time of each frame in all the data, frames at each maximum value point almost agreed at the time of” When riding over convex part of inclined road”. On the other hand, “When a sudden steering wheel during driving”, a point where the absolute value of the change in package inclination during one frame reaches 0.005 ° and the point where the maximum change occurs after that. It almost coincided with the point where the curve was reached in the video. As for the 3-axis acceleration sensor, there is no difference in tendency between the curve and the straight running, and it is considered as the main cause that the influence of the roughness of the road is greatly influenced rather than the influence at the time of the curve.

  DOI Scopus

• Study on evaluating risks of routes damages at Earthquakes for evacuation guidance system

  Mihara Y., Hirakawa R., Kawano H., Nakashi K., Nakatoh Y.

  ACM International Conference Proceeding Series      2019年05月  [査読有り]

   概要を見る

  © 2019 Association for Computing Machinery. In recent years, the damage caused by the earthquake has become very large in Japan. Secondary disasters such as tsunami and fire are the main causes of death due to the earthquake, both of which are causes of evacuation delay. Rapid evacuation is important in the event of a disaster. However, due to the earthquake, various obstacles will occur in the aisle. Obstacles may occur due to the collapse of houses due to the earthquake and it may take time to pass. If you can obtain information about the aisle in advance and avoid evacuation routes in advance, you can complete evacuation safer and more quickly. As a method of acquiring traffic information, We thought that the use of SNS is useful from the viewpoint of the real-time nature of information and the penetration rate of young people aggressively actively communicating information. In this research, we proposed an evacuation guidance system to evacuate users with a safe shortest route. Then we examined the danger of passing through obstacles. As a result, "road shredder" is evaluated as the most dangerous, and "road crack" is evaluated as the most secure.

  DOI Scopus

• Study on method of veering correction by vibration transmission in walking support for visually impaired people

  Hirayama T., Hirakawa R., Kawano H., Nakashi K., Nakatoh Y.

  ACM International Conference Proceeding Series      2019年05月  [査読有り]

   概要を見る

  © 2019 Association for Computing Machinery. In Japan, accidents are occurring when visually impaired people go out. For example, a collision with an obstacle such as a person or a wall, or a fall from the station platform. A current measure for this problem is a voice guidance. However, visually impaired people place importance on auditory information. Therefore, it is difficult for them to hear surrounding sounds during listening the voice guidance. There is a previous research that trying to guide the visually impaired people to their destination by vibration transmission. However, although this study have realized the guidance of the visually impaired people to their destination without interrupting environmental sounds, this method cannot correct the veering in real time. For above reason, we propose a veering correction system by vibration transmission, which does not disturb acquisition of auditory information. This is a system that gives them vibration by wearing a vibration motor on their shoulders and corrects the veering. In this article, we conducted verification experiment of the effectiveness of the veering correction by vibration transmission as a preliminary study in the development of the veering correction system. As a result of the research, we were able to keep the deviations from over 100 cm to less than 100 cm. As a conclusion, vibration transmission is effective as a method of correcting the veering of visually impaired people.

  DOI Scopus

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• Study on Mistype Correction Support Using Attention in Japanese Input

  Ryuki Komatsu, Rin Hirakawa, Hideaki Kawano, Kenichi Nakashi, Yoshihisa Nakatoh

  2020 IEEE 38th International Conference on Consumer Electronics  (Las Vegas, U.S.A.)  2020年01月  -  2020年01月   

• Electrolarynx System Using Voice Conversion Based on WaveRNN

  Etsuro Urabe, Rin Hirakawa, Hideaki Kawano, Kenichi Nakashi, Yoshihisa Nakatoh

  2020 IEEE 38th International Conference on Consumer Electronics  (Las Vegas, U.S.A.)  2020年01月  -  2020年01月   

• 電車内アナウンス音声と周囲の会話を判別するための音響的特徴量の検討

  木下雄斗,中藤良久,平川凛,中司賢一,河野英昭

  第72回電気・情報関係学会九州支部連合大会  (北九州市)  2019年09月  -  2019年09月   

• ディープラーニングを用いたアルコールの分解過程を推測する方法の検討

  狩郷杏人,中司賢一

  第72回電気・情報関係学会九州支部連合大会  (北九州市)  2019年09月  -  2019年09月   

• SNS情報を利用した震災時通路被害の推定に関する検討

  三原優二郎,中藤良久,中司賢一,河野英昭,平川凛

  第72回電気・情報関係学会九州支部連合大会  (北九州市)  2019年09月  -  2019年09月   

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• 感性バイオセンサの開発

  基盤研究(S)

  研究期間:  2006年04月  -  2011年03月

  研究課題番号:  18106009

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• Low-power, high-efficiency power supply systems and low-power integrated circuits design

  University of California at Berkeley  アメリカ合衆国  研究期間:  2000年04月  -  2001年03月

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