3 0 0 0 OA ぺた語義:「情報」個別入試への道
1 0 0 0 OA 吸音材による自動車エンジン音から感じる“スポーティ感”の感性制御
- 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.
1 0 0 0 発声障がい者支援システムの構築
1 0 0 0 ANCを用いた広島平和記念式典での騒音対策の基礎検討
- 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 ステファン エリオット
- 出版者
- 一般社団法人日本機械学会
- 雑誌
- 講演論文集
- 巻号頁・発行日
- vol.2002, no.40, pp.341-342, 2002-02-21