| Presentation | 2017-01-26 A study on feedback path re-estimation method under active noise control Kensaku Fujii, Mitsuji Muneyasu, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In this paper, we propose a method detecting the increase of the cancellation remainder of the feedback path under active noise control. The feedback path is inevitably formed in feedforward type active noise control systems detecting the reference noise with the noise detection microphone, which is generally canceled by the feedback control filter. The occurrence of howling can be thereby prevented. The feedback path, however, cannot be completely canceled. The remainder of the cancellation increases non-minimum components in the optimum noise control filter reducing the output of the error microphone to zero, which deteriorates the noise reduction effect. We also show that increase of the remainder can be recognized from the power gain of the auxiliary filter identifying the allover path from the noise detection microphone to the error microphone by using computer simulation. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | feedforward type / active noise control / noise detection microphone / feedback path / simultaneous equations method / auxiliary filter, / acoustic path change |
| Paper # | US2016-110,EA2016-78 |
| Date of Issue | 2017-01-18 (US, EA) |
| Conference Information | |
| Committee | EA / US |
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| Conference Date | 2017/1/25(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Doshisha Univ. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | [Joint Meeting on Acoustics and Ultrasonics Subsociety] Engineering/Electro Acoustics, Ultrasonic and Underwater Acoustics, and Related Topics |
| Chair | Mitsunori Mizumachi(Kyushu Inst. of Tech.) / Nobuyuki Endo(Kanagawa Univ.) |
| Vice Chair | Yoichi Haneda(Univ. of Electro-Comm.) / Suehiro Shimauchi(NTT) / Yoichi Itoh(Nihon Univ.) / Minoru Kurosawa(Tokyo Inst. of Tech.) |
| Secretary | Yoichi Haneda(KDDI R&D Labs.) / Suehiro Shimauchi(Akita Pref. Univ.) / Yoichi Itoh(Univ. of Electro-Comm.) / Minoru Kurosawa(Univ. of Toyama) |
| Assistant | Shigeto Takeoka(Shizuoka Inst. of Science and Tech.) / TREVINO Jorge(Tohoku Univ.) / Takeshi Morita(Univ. of Tokyo) |
| Paper Information | |
| Registration To | Technical Committee on Engineering Acoustics / Technical Committee on Ultrasonics |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A study on feedback path re-estimation method under active noise control |
| Sub Title (in English) | |
| Keyword(1) | feedforward type |
| Keyword(2) | active noise control |
| Keyword(3) | noise detection microphone |
| Keyword(4) | feedback path |
| Keyword(5) | simultaneous equations method |
| Keyword(6) | auxiliary filter, |
| Keyword(7) | acoustic path change |
| 1st Author's Name | Kensaku Fujii |
| 1st Author's Affiliation | Kodaway Laboratory(Kodaway Lab.) |
| 2nd Author's Name | Mitsuji Muneyasu |
| 2nd Author's Affiliation | Kansai University(Kansai Univ.) |
| Date | 2017-01-26 |
| Paper # | US2016-110,EA2016-78 |
| Volume (vol) | vol.116 |
| Number (no) | US-419,EA-420 |
| Page | pp.pp.185-190(US), pp.61-66(EA), |
| #Pages | 6 |
| Date of Issue | 2017-01-18 (US, EA) |