Acoustical direction Finder

The location of an acoustic source can be estimated by measuring an acoustic direction of incidence and the exact location

Abstract

The location of an acoustic source can be estimated by measuring an acoustic direction of incidence and the exact location (range difference) can also be estimated. Methods for determining the direction of incidence based on sound intensity, the phase of cross-spectral functions, and cross-correlation functions are available. In this current work, we implement the cross correlation and GCC_phat methods. Direction of arrival (DOA) estimation using microphone arrays is to use the phase information present in signals from microphones that are spatially separated. For any pair of microphones, the surface on which the time difference of arrival (TDOA) is constant is a hyperboloid of two sheets. Acoustic source localization algorithms typically exploit this fact by grouping all microphones into pairs, estimating the TDOA of each pair, and then finding the point where all associated hyperboloids most nearly intersect. We use the optimum estimator (Chan method) to localize the acoustic source position in 2-dimensional space have been successfully

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