Author: Tsui, Po-kwok
Title: Source location using crosspower spectrum phase in small room
Degree: M.Sc.
Year: 2000
Subject: Signal processing
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Department of Electronic and Information Engineering
Pages: vii, 73 leaves : ill. ; 30 cm
Language: English
Abstract: This paper aims to present a method for acoustic source location and analysis the performance of the proposed method. Acoustic source location can be divided into two parts: measurement of time delay of arrival (TDOA) and source location algorithm based on TDOA. Time delay of arrival was measured by Crosspower Spectrum Phase (CSP) which is based on the power of cross correlation of signals recorded by two microphones. Source location algorithm is a method to calculate the exact position of the source. It is based on cosine rule and requires two TDOAs among microphones. Simulation will be carried to verify the algorithms. Image Method will be used to calculate the impulse response of microphones in a small room. Sound sources for simulation are recorded from Internet Broadcasting in Hong Kong. Different source type will be used for simulation including male voice, female voice, beep sound and synthesis signal contains different frequency and amplitude of sine waves. Furthermore, performances of the algorithm are evaluated through lot of simulations of different value of signal-to-noise ratio (SNR) and wall reflection coefficient (Beta). Result shows that the proposed algorithm gives better result of human voice than beep sound and composite signal due to rich frequency content of human voice. In a quiet and low reflection environment, the lowest location error is 0.06 meter. Location error increase significantly when wall reflection ratio larger than 0.5 or signal-to-noise is under 20 dB. The proposed algorithm of Crosspower Spectrum Phase for acoustic source location gives a good estimation of source position in quiet and low reflection environment. Even in noisy and reverberant environment, it also gives not bad estimation with reasonable location error.
Rights: All rights reserved
Access: restricted access

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