Analysis of two microphone method for feedback cancellation
Acoustic feedback cancellation in hearing aids makes use of adaptive filters to continuously identify and track variations to the feedback path. One of the biggest problems remaining in using adaptive filters for feedback cancellation is the biased estimation of the filter's coefficients. In or...
| Main Authors: | , , |
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| Format: | Journal Article |
| Published: |
Institute of Electrical and Electronics Engineers Inc.
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/20372 |
| _version_ | 1848750287200714752 |
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| author | Nakagawa, C. Nordholm, S. Yan, Wei-Yong |
| author_facet | Nakagawa, C. Nordholm, S. Yan, Wei-Yong |
| author_sort | Nakagawa, C. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Acoustic feedback cancellation in hearing aids makes use of adaptive filters to continuously identify and track variations to the feedback path. One of the biggest problems remaining in using adaptive filters for feedback cancellation is the biased estimation of the filter's coefficients. In order to remove the undesired correlation between the loudspeaker and incoming signal, a recent alternative scheme proposed to employ an additional microphone. This microphone can provide added information to obtain an incoming signal estimate. This estimate is removed from the primary microphone signal to create the error signal which adapts the canceler's coefficients. This letter provides the theoretical analysis for the two microphone method. It presents analytic expressions showing that the optimal solution is no longer dependent on the signal correlation aforementioned but is now mainly determined by the additional feedback path. Finally, it demonstrates simulation results with the prediction error method in terms of misalignment and maximum gain for a proposed microphone placement. The results show that a more stable solution is obtained with the proposed two microphone approach. © 2014 IEEE. |
| first_indexed | 2025-11-14T07:34:26Z |
| format | Journal Article |
| id | curtin-20.500.11937-20372 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:34:26Z |
| publishDate | 2015 |
| publisher | Institute of Electrical and Electronics Engineers Inc. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-203722017-09-13T13:50:23Z Analysis of two microphone method for feedback cancellation Nakagawa, C. Nordholm, S. Yan, Wei-Yong Acoustic feedback cancellation in hearing aids makes use of adaptive filters to continuously identify and track variations to the feedback path. One of the biggest problems remaining in using adaptive filters for feedback cancellation is the biased estimation of the filter's coefficients. In order to remove the undesired correlation between the loudspeaker and incoming signal, a recent alternative scheme proposed to employ an additional microphone. This microphone can provide added information to obtain an incoming signal estimate. This estimate is removed from the primary microphone signal to create the error signal which adapts the canceler's coefficients. This letter provides the theoretical analysis for the two microphone method. It presents analytic expressions showing that the optimal solution is no longer dependent on the signal correlation aforementioned but is now mainly determined by the additional feedback path. Finally, it demonstrates simulation results with the prediction error method in terms of misalignment and maximum gain for a proposed microphone placement. The results show that a more stable solution is obtained with the proposed two microphone approach. © 2014 IEEE. 2015 Journal Article http://hdl.handle.net/20.500.11937/20372 10.1109/LSP.2014.2345571 Institute of Electrical and Electronics Engineers Inc. restricted |
| spellingShingle | Nakagawa, C. Nordholm, S. Yan, Wei-Yong Analysis of two microphone method for feedback cancellation |
| title | Analysis of two microphone method for feedback cancellation |
| title_full | Analysis of two microphone method for feedback cancellation |
| title_fullStr | Analysis of two microphone method for feedback cancellation |
| title_full_unstemmed | Analysis of two microphone method for feedback cancellation |
| title_short | Analysis of two microphone method for feedback cancellation |
| title_sort | analysis of two microphone method for feedback cancellation |
| url | http://hdl.handle.net/20.500.11937/20372 |