Abstract: 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.

Key words: Immittance Spectral Pairs(ISP), ISP pseudo-cepstrum coefficients, perceptual weighting filter

摘要： 针对50 Hz~7 000 Hz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。

关键词: 电抗谱对, ISP伪倒谱系数, 感觉加权滤波器

CLC Number: 

• TP391