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dc.contributor.authorBai, Mingsian R.en_US
dc.contributor.authorHo, Pochangen_US
dc.date.accessioned2014-12-08T15:12:20Z-
dc.date.available2014-12-08T15:12:20Z-
dc.date.issued2008-04-01en_US
dc.identifier.issn1549-4950en_US
dc.identifier.urihttp://hdl.handle.net/11536/9485-
dc.description.abstractNoise, interference, and echo present problems in the use of hands-free communication systems in cars. In this study a microphone system integrating various array signal processing technologies is developed to overcome these problems. The microphone array acts like a spatial filter so that both signal-to-noise ratio and directivity can be improved. In the system the method of steered-response power-phase transform, which is robust to reverberant environments, is employed to estimate the direction of arrival (DOA) of the incoming sound signal. Once the DOA is found, the main beam of the microphone array is steered electronically in that direction to receive the signals. In order to attain a sharp spatial resolution, a superdirective design is employed in beamforming. A low-pass filter is used in postprocessing the array output to enhance human speech. In addition the system copes with acoustic echo by using an adaptive filter based on the least-mean-squares method. All algorithms have been integrated and implemented on the platform of a digital signal processor. Experimental results demonstrate that the proposed system is effective in car hands-free applications.en_US
dc.language.isoen_USen_US
dc.titleUsing a steered-response power-phase transform to optimize speech pickup in reverberabt environmentsen_US
dc.typeArticleen_US
dc.identifier.journalJOURNAL OF THE AUDIO ENGINEERING SOCIETYen_US
dc.citation.volume56en_US
dc.citation.issue4en_US
dc.citation.spage280en_US
dc.citation.epage291en_US
dc.contributor.department機械工程學系zh_TW
dc.contributor.departmentDepartment of Mechanical Engineeringen_US
dc.identifier.wosnumberWOS:000255880900004-
dc.citation.woscount0-
Appears in Collections:Articles