回音消除方法及其系統ACOUSTIC ECHO CANCELLATION METHOD AND SYSTEM USING THE SAME

專利類型

發明

專利國別 (專利申請國家)

美國

專利申請案號

14/526,702

專利證號

US 9,763,005 B2

專利獲證名稱

回音消除方法及其系統ACOUSTIC ECHO CANCELLATION METHOD AND SYSTEM USING THE SAME

專利所屬機關 (申請機關)

元智大學

獲證日期

2017/09/12

技術說明

本發明提出一種回音消除方法及其系統。所述回音消除方法包括以下步驟。首先，建立包括複數個空間特徵向量之先驗知識矩陣。接著，以先驗知識矩陣與權重矩陣產生初始適應濾波矩陣。其後，將輸入訊號與初始適應濾波矩陣以迭代演算法估計原始訊號經由近端空間之空間脈衝響應所產生之脈衝響應訊號以調整權重矩陣，並更新初始適應濾波矩陣之係數。根據調整後之權重矩陣產生對應於空間脈衝響應訊號的近端適應濾波矩陣。最後，根據近端適應濾波矩陣對後續之輸入訊號進行濾波。 An exemplary embodiment of the present disclosure provides an acoustic echo cancellation method. The method comprises the following steps. Firstly, a prior-knowledge matrix comprising a plurality of space vectors are built. Then, an initial adaptive-filtering vector is generated by the prior-knowledge matrix and a weighting vector. The input signal is calculated with the initial adaptive-filtering vector in an iteration algorithm to estimate an impulse response signal generated from an original signal via a room impulse response of a near-end room to adjust the weighting vector, and the coefficient of the initial adaptive-filtering vector is updated according to the adjusted weighting vector. A near-end adaptive-filtering vector corresponded to the impulse response signal is generated according to the adjusted weighting vector. Finally, the next input signal is canceled by the near-end adaptive-filtering vector.

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