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Development of a Listener Position Adaptive Real-Time Sound Reproduction System  

Lee, Ki-Seung (건국대학교 정보통신대학 전자공학부)
Lee, Seok-Pil (전자부품연구원 방송통신융합 연구센터)
Publication Information
The Journal of the Acoustical Society of Korea / v.29, no.7, 2010 , pp. 458-467 More about this Journal
Abstract
In this paper, a new audio reproduction system was developed in which the cross-talk signals would be reasonably cancelled at an arbitrary listener position. To adaptively remove the cross-talk signals according to the listener's position, a method of tracking the listener position was employed. This was achieved using the two microphones, where the listener direction was estimated using the time-delay between the two signals from the two microphones, respectively. Moreover, room reverberation effects were taken into consideration where linear prediction analysis was involved. To remove the cross-talk signals at the left-and right-ears, the paths between the sources and the ears were represented using the KEMAR head-related transfer functions (HRTFs) which were measured from the artificial dummy head. To evaluate the usefulness of the proposed listener tracking system, the performance of cross-talk cancellation was evaluated at the estimated listener positions. The performance was evaluated in terms of the channel separation ration (CSR), a -10 dB of CSR was experimentally achieved although the listener positions were more or less deviated. A real-time system was implemented using a floating-point digital signal processor (DSP). It was confirmed that the average errors of the listener direction was 5 degree and the subjects indicated that 80 % of the stimuli was perceived as the correct directions.
Keywords
Cross-talk cancellation; direction of arrival (DOA) estimation; real-time implementation;
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