標題: 一麥克風陣列迴音消除器及其ASIC設計
A Microphone Array Echo Canceller and Its ASIC Design
作者: 謝志和
Hsieh, Chih-Ho
吳文榕
Wu, Wen-Rong
電信工程研究所
關鍵字: 麥克風;迴音消除器
公開日期: 1997
摘要: 在這篇論文中,我們提出一種新的迴音章消除器架構。這種迴音消除器使用麥克風陣列來擷取語音信號。由於麥克陣列的使用,我們可以用一個較短的適應性有限脈衝響應濾波器來模擬聲音通道。我們接著詳細說明所提出迴音消除器之動作方式。此外,我們提出一個新的方法來偵測雙邊通話的情況。這是藉由監測適應性濾波器加權係數向量的功率來達成。這個方法對於於雙邊通話的發生非常敏感,並且不會將房間響應的變化誤認為是雙邊通話。最後,我們從事所提出迴音消除器之ASIC設計。由於使用管線式以及硬體分享的技巧,我們的設計擁有很高的工作效率以及小的晶片面積。
In this thesis, a new structure for acoustic echo cancellation is presented. This echo canceller uses a microphone array to acquire speech signals. Due to the use of the microphone array, we can use a shorter adaptive FIR filter to identify the acoustic channel. We then describe the operations of the prooposed echo canceller in detail. Besides, a new approach to the detection of double - talk is proposed This is achieved by monitoring the power of the adaptive filter weight vector. Our method is very sensitive to the occurrence of double - talk and it can distinguish the room impulse response double - talk.Finally, we consider the ASIC design of the proposed echo canceller. Using the techniques of pipelining and hardware sharing, we are able to design the ASIC with a high working efficiency as well as a small chip area.
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT863435008
http://hdl.handle.net/11536/63451
Appears in Collections:Thesis