一種結合GMDF適應性濾波器之頻率域雙邊談話偵測機制

A Frequency Double-Talk Detection Combined with the GMDF Adaptive Filter

黃旭章(Hsu-Chang Huang)

指導教授 ： 李仲溪

元智大學/工程學院/電機工程學系/碩士(2006年)

摘要

本論文主要研究一種結合GMDF適應性濾波器之頻率域雙邊談話機制處理免手持通訊系統中之聲學迴音問題。我們提出的時間域以及頻率域雙邊談話機制包含遠近端語音偵測和輔助濾波器二種架構。其中以頻率域雙邊談話機制效果最佳。此機制使用了L個子濾波器，能夠有效分辨迴音與近端語音，使適應性濾波器達到消除迴音而不破壞近端語音的好處。另外本論文也提出幾種處理時變系統之方法，對於我們觀察適應性之收斂特性有很大的幫助。

關鍵字

雙邊談話偵測器 ； 聲學迴音

並列摘要

The main purpose of this thesis is about a frequency Double-talk detection combined with the GMDF adaptive filter processed the acoustic echo problem in hands free communication system. The proposed Double-talk detector in time domain and frequency domain include a near-end speech detector and an auxiliary filter two kinds of structure. Among them have the best result with the Double-talk detection in the frequency domain. The detector used L subfilters that show extremely tight and severe to differentiate between double talk and single talk. Therefore, this detection differentiated between echo and near-end speech efficiently. This thesis also presents some methods observed convergence characteristic of adaptive filter in time-variant systems.

並列關鍵字

double-talk detector ； acoustic echo

參考文獻

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