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The aim of this research is developing a system that estimates the direction of users by attaching multiple antennas to users. We proposed the method of direction estimation using RSSI of multiple XBees antennas attached to the helmet as a wearable device. In this study, we used a bucket filled with water to simulate the human head and confirmed that direction estimation is sufficiently possible....
Compassing the spatial shape is used out of developing surround speaker system or signal enhancement. To reconstruct the boundary positions, conventional methods offer an array consists of a large number of elements (e.g. microphones and loudspeakers). This research aims to estimate the correct boundary position using a small number of microphones, by developing a signal processing method which utilizes...
We propose methods for calculating sound field propagation in an inhomogeneous medium called ??sectional near-field acoustical holography?? (SNAH), and estimating a sound velocity distribution using SNAH and simulated annealing (SA). SNAH can be applied to an inhomogeneous medium. In contrast, a wavenumber must be constant in a calculated area in ordinary NAH theory. A space between two planes is...
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