修正自适应格型陷波器及其应用

An improved adaptive lattice notch filter and its application

提出了一种频率响应非对称的修正自适应格型陷波器(improved adaptive lattice notch filter,I-ALNF),并且提出一种新的自适应格型递推算法。将陷波器传递函数零极点部分同时引入到自适应调整算法中,使陷波器具有更好的特性。该陷波器应用于语音信号处理,根据其反射系数推导出自适应陷波频率,可以较容易的检测到语音声门闭合时刻(glottal closure instant,GCI)的位置。

An improved adaptive lattice notch filter （I-ALNF）having unsymmetrical frequency response is proposed. A new improved adaptive algorithm to fulfill I-ALNF using zero-pole parameters is deduced. Based on good detection performance of the I-ALNF, the glottal closure instant （GCI）can be positioned through an instant frequency, which is iterated by reflectance. Experiment results show that the proposed method is effective.