Feedback cancellation with probe shaping compensation
Adaptive feedback cancellation methods may integrate the use of probe signals to assist with the biased optimal solution in acoustic systems working in closed-loop. However, injecting a probe noise in the loudspeaker decreases the signal quality perceived by users of assistive listening devices. To...
| Main Authors: | , , |
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| Format: | Journal Article |
| Published: |
Institute of Electrical and Electronics Engineers
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/17400 |
| _version_ | 1848749456690774016 |
|---|---|
| author | Nakagawa, Carlos Nordholm, Sven Yan, Wei-Yong |
| author_facet | Nakagawa, Carlos Nordholm, Sven Yan, Wei-Yong |
| author_sort | Nakagawa, Carlos |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Adaptive feedback cancellation methods may integrate the use of probe signals to assist with the biased optimal solution in acoustic systems working in closed-loop. However, injecting a probe noise in the loudspeaker decreases the signal quality perceived by users of assistive listening devices. To counter this, probe signals are usually shaped to provide some level of perceptual masking. In this letter we show the impact of using a shaping filter on the system behavior in terms of convergence rate and steady state error. From this study, it can be concluded that shaping the probe signal may have detrimental influence in terms of system performance. Accordingly, we propose to use the unshaped probe signal combined with an inverse filter of the shaping filter to identify the feedback channel. This restructure of the problem restores convergence rate of LMS type algorithms. Furthermore, we also show that an adequate forward path delay is required to obtain an unbiased solution and that the suggested scheme reduces this delay. |
| first_indexed | 2025-11-14T07:21:14Z |
| format | Journal Article |
| id | curtin-20.500.11937-17400 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:21:14Z |
| publishDate | 2014 |
| publisher | Institute of Electrical and Electronics Engineers |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-174002017-09-13T15:43:29Z Feedback cancellation with probe shaping compensation Nakagawa, Carlos Nordholm, Sven Yan, Wei-Yong Adaptive feedback cancellation methods may integrate the use of probe signals to assist with the biased optimal solution in acoustic systems working in closed-loop. However, injecting a probe noise in the loudspeaker decreases the signal quality perceived by users of assistive listening devices. To counter this, probe signals are usually shaped to provide some level of perceptual masking. In this letter we show the impact of using a shaping filter on the system behavior in terms of convergence rate and steady state error. From this study, it can be concluded that shaping the probe signal may have detrimental influence in terms of system performance. Accordingly, we propose to use the unshaped probe signal combined with an inverse filter of the shaping filter to identify the feedback channel. This restructure of the problem restores convergence rate of LMS type algorithms. Furthermore, we also show that an adequate forward path delay is required to obtain an unbiased solution and that the suggested scheme reduces this delay. 2014 Journal Article http://hdl.handle.net/20.500.11937/17400 10.1109/LSP.2014.2301832 Institute of Electrical and Electronics Engineers fulltext |
| spellingShingle | Nakagawa, Carlos Nordholm, Sven Yan, Wei-Yong Feedback cancellation with probe shaping compensation |
| title | Feedback cancellation with probe shaping compensation |
| title_full | Feedback cancellation with probe shaping compensation |
| title_fullStr | Feedback cancellation with probe shaping compensation |
| title_full_unstemmed | Feedback cancellation with probe shaping compensation |
| title_short | Feedback cancellation with probe shaping compensation |
| title_sort | feedback cancellation with probe shaping compensation |
| url | http://hdl.handle.net/20.500.11937/17400 |