應用層狀雙線性結構於適應性非線性迴音消除器之研究

Abstract

本文提出一個以適應性雙層結構之雙線性濾波器為基礎的非線性迴音消除 器。從其固有之架構上，簡約其中的運算係數，並且進而提出一個新的演 算法。經由電腦模擬出來的結果顯示本文中所提出之演算法可以有效地改 善迴音消除的性能。在訊號雜訊比(SNR) 等於30dB的條件下，其ERLE值比 線性迴音消除器超出15dB。 A nonlinear echo canceller, based on the adaptive two-layer bilinear filter structure, is presented. The computation coeifficients are reduced from a general adaptive layered bilinear filter. Computer simulation results show that our methods can improve the echo cancellation performanceefficiently. The ERLE(echo return loss enhancement) over the adaptive linearecho canceller is 15 dB approximately at SNR=30 dB.