臺灣博碩士論文加值系統

在建構一個舒適的通訊環境系統時，我們所面對的問題包括了有聲學迴音、噪音及雙方談話的干擾。本文中針對聲學迴音、噪音及雙方談話進行研究，利用適應性濾波器以NLMS演算法搭配聯合架構( 聲學迴音消除加上頻率域噪音降低機制 )可使迴音消除機制有不錯的效能，噪音也有抑制的功效。同時在雙方談話的部份我們使用二個相關函數的雙方談話偵測方法也可以有效解決雙方談話問題。
在迴音消除機制中我們也整合了雙邊談話偵測及噪音降低的機制，同時使用在車子、房間、客廳時的聲學迴音路徑來進行實驗，並從模擬結果驗證了我們的分析及呈現出此適當的架構可以提供了一個舒適的通訊系統。

We may face some problems such as acoustic echo, noise and double-talk of conversation in building up a comfortable communication system environment. In the thesis, we investigate on acoustic echo, noise and double-talk. The acoustic echo cancellation with frequency domain noise reduction will work in canceling the echo and noise. We also use two cross-correlation functions to detect the double-talk situation. We find the method is good by numerous experiment.
We integrate the double-talk detector and noise cancellation in acoustic echo canceller. we use the echo paths of a car, a small room and a living room in experiments. The results verify our analysis and show that the structure we propose is suitable to provide a comfortable communication system.

目 錄
中文摘要i
英文摘要ii
誌謝iii
目錄iv
圖目錄vi
表目錄xi
第一章 簡介1
1.1 背景介紹1
1.2 論文動機2
1.3 論文組織2
第二章 聲學迴音與噪音消除技術分析4
2.1 簡介4
2.2 適應性聲學噪音消除方法6
2.3 適應性聲學迴音消除方法8
2.4 聲學迴音消除及噪音降低機制9
2.5 適應性演算法之介紹10
2.5.1 LMS演算法(最小平均平方誤差演算法)11
2.5.2 GMDF演算法(一般化多工延遲頻率域演算法)13
第三章 探討模擬適應性演算法15
3.1 探討NLMS和GMDF演算法16
3.1.1 白色輸入訊號17
3.1.2 語音輸入訊號19
3.2 結論25
第四章 探討雙邊談話偵測技術26
4.1 簡介26
4.2 探討雙邊談話偵測器近代趨勢28
4.2.1 比較迴音路徑的輸入與殘餘迴音功率28
4.2.2 利用相關函數的方法29
4.2.3 利用二個相關函數的方法30
4.3 實驗模擬32
4.4 結論38
第五章 聲學迴音及噪音消除實驗模擬與結果40
5.1 簡介40
5.2 聯合聲學迴音及噪音架構及加入雙方談話偵測機制40
5.2.1 使用聯合架構與人工化的雙方談話偵測方法模擬42
5.2.2 使用聯合架構與相關函數的雙方談話偵測方法模擬45
5.2.3 使用聯合架構與比較迴音路徑的輸入與殘餘迴音功率的雙方談話偵測方法模擬48
5.2.4 使用聯合架構與二個相關函數的雙方談話偵測方法模擬50
5.3 以不同環境因素(車子、房間、客廳）模擬聯合聲學迴音及噪音架構與加入雙方談話偵測機制53
5.4結論66
第六章 結論67
6.1論文總結67
6.2未來工作68
參考文獻69

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