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研究生:黃薇倢
研究生(外文):Wei-Chieh Huang
論文名稱:數位波導網柵邊緣之研究
論文名稱(外文):Studies on the boundary of digital waveguide mesh
指導教授:張嘉銘張嘉銘引用關係
指導教授(外文):Chia-Ming Chang
學位類別:碩士
校院名稱:大同大學
系所名稱:資訊工程學系(所)
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2007
畢業學年度:95
論文頁數:45
中文關鍵詞:數位波導網柵邊緣
外文關鍵詞:boundary of digital waveguide
相關次數:
  • 被引用被引用:0
  • 點閱點閱:156
  • 評分評分:
  • 下載下載:4
  • 收藏至我的研究室書目清單書目收藏:0
近年來人們對聲音的研究通常注重在聲音的應用上,然而聲音的研究和聲音傳遞有密不可分的關係,因此音場的模擬也變成一個值得探討的研究,例如:音源定位、雜訊消除及從多音源的環境中擷取特定位置的聲音時,都需要針對每組發聲源及接收點,逐一計算之間的傳遞距離、衰減率、相位及邊緣的反射係數,才能確實得到接收點位置的聲音壓力大小。
本篇論文提出一個模擬聲音傳遞的人工音場空間。目的是希望能加快聲音研究上聲波傳遞能量的計算,降低計算聲音傳遞的複雜度。本篇論文使用MATLAB模擬出一個矩形數位波導管網柵模型,首先我們利用波的傳遞特性來模擬聲波在二維空間內的傳遞方式,設定波源及傳遞次數便可以得到接收點得到的聲音壓力能量值。
在物理上,當聲波碰到邊源,會產生反射波,可是當只針對在一個無限大的環境下,有興趣的有限範圍進行討論,聲音的傳遞應不能因為接觸到模擬的邊緣而產生反射現象。因此,本論文主要探討利用一個有限空間去模擬一個沒有反射邊緣的無限大的環境,運用邊緣的物理特性,製造出一個虛擬邊緣,防止聲波碰觸到有興趣邊緣的限定邊緣時造成反射,使得範圍內的聲波能夠不受邊緣影響,如同存在一個無限大的空間繼續傳遞。
In recent years, people usually focus on studying the application of sound field. There are great relations between application and propagation of the sound. Thus the simulation of the propagating sound field is turned into a quite important research. Original method to measure the sound pressure of each receiver from multiple sources, needs to calculate the sound propagation paths between each pair of sound source and acceptance point, decaying rate, phase and the reflection coefficient on the edge one by one. Getting the sound pressure of each acceptance point is a time-consuming thing.
In this paper, an artificial sound field model is discussed. The purpose of this thesis is accelerating the calculation of the sound wave propagation energy in sound’s studying and reducing the complexity of the research. This model is simulated by softwave MATLAB using physical wave characteristics to simulate sound wave propagating in rectangular digital waveguide mesh. Only the setting for the sound source and the number of propagation times are needed, then the sound pressure of thereceiving point are collected.
The reflection should not appear when the propagating wave touching the edge
of region of interest. Thus simulating a sound field with non-reflection boundary is needed. In this thesis, discussing two methods to make a non-reflection boundary for the region of interest. Using a finite region with non-reflection models a infinite field. The sound wave propagation isn't affected by the reflection.
TABLE OF CONTENTS
ACKNOWLEDGMENTS iv
CHINESE ABSTRACT v
ABSTRACT vi
1 INTRODUCTION 1
1.1 Motivation and objective 1
1.2 Thesis organization 3
2 RELATED RESEARCHES 4
2.1 Sound wave 4
2.1.1 Reflection at a boundary 4
2.2 Digital waveguide model (DWM) 5
2.2.1 Introduction 5
2.2.2 Basic component and propagation theorem 7
2.2.3 Digital waveguide mesh 10
2.3 Dispersion error 12
2.4 Boundary phenomenon 13
3 SYSTEM ORGANIZATION 16
3.1 Biaxial digital waveguide model 16
3.2 Non-reflection boundary of digital waveguide model 22
3.2.1 Non-reflection boundary 22
3.2.2 Two-walls secluding method 23
3.2.3 Reflection interfering method 29
4 SIMULATION 34
4.1 Simulation environment 34
4.2 Simulation of the sound propagation field 34
5 CONCLUSIONS AND FUTURE WORK 41
5.1 Conclusions 41
5.2 Future work 41
REFERENCES
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