Author: Shi, Fangdi
Title: Locating sound source in the presence of reflections
Degree: M.Eng.
Year: 2014
Subject: Acoustic localization.
Directional hearing.
Hong Kong Polytechnic University -- Dissertations
Department: Department of Building Services Engineering
Pages: x, 71 leaves : illustrations (some color) ; 30 cm
Language: English
Abstract: Sound source located has significant meaning and is widely used in many fields nowadays, however, when strong reflections exist, the environment of measurement is complex, which will influence the accuracy a lot. The methodologies on locating source may be categorized into two groups: one is to measure the time of arrival between a transmitted pulse and its echo and another is to estimate the time difference of arrival (TDOA) between two sensors mounted at different points in space. In this dissertation, the beamforming theory and TDOA theory will be reviewed. And this dissertation also intends to develop a methodology based on beamforming algorithm that allows one to locate sound source and distinguish the image of the source from the real source in three-dimensional space in real time. Input data are preprocessed by denoising, windowing, filtering, and averaging to enhance the accuracy. The results are then post-processed using triangulations, autonomous error estimations and corrections. To acquire a better understanding of this approach, numerical simulations are disposed first to examine the influence of various parameters such as signal noise ratio, frequency on the accuracy, and microphone spacing and source distances and spatial resolution of the prediction. Experiments are performed in different environments to evaluate its effectiveness in locating sources, including white noise signal and impulse signal. In particular, three kinds of material are chosen to provide reflections, which help to analyze the performance of the system.
Rights: All rights reserved
Access: restricted access

Files in This Item:
File Description SizeFormat 
b27606181.pdfFor All Users (off-campus access for PolyU Staff & Students only)4.07 MBAdobe PDFView/Open

Copyright Undertaking

As a bona fide Library user, I declare that:

  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.

By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

Show full item record

Please use this identifier to cite or link to this item: