| Presentation | 2007-12-07 Hardware implementation of comb filter and frequency shifter for elimination of acoustic oscillation Kenji ITAGAKI, Kaoru ASHIHARA, Ryuzo HORIUCHI, Shogo KIRYU, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | It has been reported that the combination of a comb filter and a frequency shifter can reduce the acoustic oscillation. In the present study, the comb filter and the frequency shifter were processed simultaneously by FIR filters that used Hilbert transformer. The FIR filters were implemented on the FPGA board with the audio CODEC. A microphone and a loudspeaker were connected to the CODEC so that the oscillation margin could be measured. When the combination of the comb filter and the frequency shifter was employed, the oscillation margin as much as 12dB was achieved. It was confirmed that the method was effective especially against the oscillation at the higher frequencies. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | acoustic feedback / frequency shifter / comb filter / Hilbert transform / hearing aid |
| Paper # | EA2007-91 |
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| Conference Information | |
| Committee | EA |
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| Conference Date | 2007/11/30(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
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| Vice Chair | |
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| Paper Information | |
| Registration To | Engineering Acoustics (EA) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Hardware implementation of comb filter and frequency shifter for elimination of acoustic oscillation |
| Sub Title (in English) | |
| Keyword(1) | acoustic feedback |
| Keyword(2) | frequency shifter |
| Keyword(3) | comb filter |
| Keyword(4) | Hilbert transform |
| Keyword(5) | hearing aid |
| 1st Author's Name | Kenji ITAGAKI |
| 1st Author's Affiliation | Musashi Institute of Technology() |
| 2nd Author's Name | Kaoru ASHIHARA |
| 2nd Author's Affiliation | National Institute of Advanced Industrial Science and Technology |
| 3rd Author's Name | Ryuzo HORIUCHI |
| 3rd Author's Affiliation | National Institute of Advanced Industrial Science and Technology |
| 4th Author's Name | Shogo KIRYU |
| 4th Author's Affiliation | Musashi Institute of Technology |
| Date | 2007-12-07 |
| Paper # | EA2007-91 |
| Volume (vol) | vol.107 |
| Number (no) | 370 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |