基于伪倒谱感觉加权滤波器的设计及应用  

Design and Application of Perceptual Weighting Filter Based on Pseudo-cepstrum

作　　者：李凤莲[1] 张雪英[1] 

机构地区：[1]太原理工大学信息工程学院,太原030024

出　　处：《计算机工程》2010年第3期275-276,279,共3页Computer Engineering

基　　金：山西省自然科学基金资助项目(20051039)

摘　　要：针对50Hz～7000Hz的宽带语音低频到高频的频谱倾斜现象严重问题,设计一个适用于宽带语音编码的感觉加权滤波器。该滤波器根据ISP伪倒谱与线性预测倒谱系数差进行设计,ISP伪倒谱是电抗函数自然对数一半取反z变换,其实质是一个多项式的倒谱。实验结果表明,该滤波器对改善宽带语音频谱倾斜问题具有较好的效果。Aiming at the more pronounced spectral tilt problem between low and high frequencies in 50 Hz-7 000 Hz wideband speech signals, this paper proposes a novel perceptual weighting filter. It is based on the cepstral difference of Immittance Spectral Pairs（ISP） pseudo-cepstrum and linear prediction cepstral coefficients. ISP pseudo-cepstrum coefficients is the inverse z-transform of half past natural logarithm of immittance function. It is a polynomial cepstrum in fact. Experimental results show that the proposed filter can efficiently compensate the spectral tilt of wideband speech signals.

关 键 词：电抗谱对 ISP伪倒谱系数 感觉加权滤波器 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]