著者
石光 俊介
出版者
情報処理学会
雑誌
情報処理
巻号頁・発行日
vol.64, no.9, pp.462-466, 2023-08-15

広島市立大学情報科学部では25年度入試に「情報」の個別入試導入をきめた.その個別入試導入にいたる紆余曲折を情報科学部入試委員長の視点から解説する.
著者
村井 研太 石光 俊介
出版者
日本感性工学会
雑誌
日本感性工学会論文誌 (ISSN:18845258)
巻号頁・発行日
pp.TJSKE-D-21-00067, (Released:2022-08-02)
参考文献数
11

Currently, sound quality control using Active Noise Control (ANC) and Passive Noise Control (PNC) has been used as noise reduction methods. ANC has an effect on the low-frequency noise, and PNC affects the high-frequency noise. However, in the case of sound control, our previous study revealed that individual preference affects the sound impression strongly to each. In recent years, as the quality of automobiles is developing day by day, the driving sound of automobiles has become an essential factor affecting an auditory impression. In other words, the engine sound control has been shifting from noise control to sound design. In this study, we investigated how the impression of engine sound changes by sound absorbers. The engine sound in the automobile with or without sound absorbers was investigated. Furthermore, these sounds were analyzed by the SD method and factor analysis to find a subjective impression. As a result, the subjective indicator (adjective pair) that affected the auditory impression was clarified. Moreover, the possibility of adding specific sound impressions by changing sound absorbers was also conducted. The MUSHRA method was adopted as the evaluation method. The relationship between the frequency band that adds a specific impression and the auditory impression was clarified by the MUSHRA method.
著者
石光 俊介 福井 和敏 山中 貴弘 中山 仁史
出版者
自動制御連合講演会
雑誌
自動制御連合講演会講演論文集
巻号頁・発行日
vol.57, pp.408-412, 2014

構音障がい者を対象として発声支援システムの開発を行っている.このシステムでは健常者音声から推定した線形予測係数を用いて障がい者体内伝導音を明瞭化する.システムの概要の他,明瞭化手法の検討結果,および,その有効性を聴取実験および調音素性分析により評価した内容について発表する.
著者
田中 大輔 石光 俊介
出版者
一般社団法人 日本機械学会
雑誌
Dynamics & Design Conference
巻号頁・発行日
vol.2016, 2016

<p>Every year the City of Hiroshima holds the Peace Memorial Ceremony to console the souls of those who were lost due to the atomic bombing as well as pray for the realization of everlasting world peace. Since the ambient noise of this ceremony is very loud, these noise was tried to reduce using a passive method and Active Noise Control (ANC). There are some problems that audiences or TV crews cannot catch the meanings of presenter's messages such as the Prime Minister's, because of ambient noise. To reduce these noises, tents were prepared in the venue. There were also useful for protect people from the strong suns. The difference between the sounds near the loudest place in the park and those in the venue was measured to confirm the effectiveness of each countermeasure. The one of the loudest noise came from an opposite bank of the river. Though the noise was detected at the river side, it was not detected in the venue. As a result, the noise in the venue was reduced by 15 dB owing to each countermeasure. As most of the noise are speech, a 6-second young woman's voice was used as the noise source and reference signal in the ANC test of this study. Noise source includes the high frequency components up to 4000Hz. High-speed signal processing was required to reduce the noise that has high frequency components and changes its amplitudes rapidly. FPGA with a clock of 40MHz was selected for the fast signal processing. Filtered-x LMS algorithm was used in the ANC, and sampling frequency was 15 kHz and adaptive filter coefficients were set to 3000 tap. As the results of control, the noise was reduced by 10dB in 500Hz to 5000Hz.</p>
著者
石光 俊介 牧山 清
出版者
広島市立大学
雑誌
基盤研究(B)
巻号頁・発行日
2009

日本は高齢化社会に向かっている.その影響もあり,高齢者に多い発声機能障害者も毎年増加している.障害者の多くは代用発声を用いるが,不明瞭である.そこで本課題では発声時の体内伝導信号を用いた発声支援システムを提案した.このシステムでは音節などのサブワード単位での認識を用いて明瞭音声と障害者音声間の伝達関数を利用して明瞭化を図っている.このシステムの有効性を聴感実験や特徴解析などにより確認した.