一种新型带通滤波器的设计及在语音分析/合成中的应用

A New Digital Bandpass Filter Design and Its Application in Speech Analysis/Synthesis

本文利用双线性变换，由一模拟带通滤波器得到了一数字式带通滤波器，并给出了该数字式带通滤波器系数与其中心频率及带宽的数学关系式．以此数字带通滤波器为原型滤波器，得出了一种数字式带通滤波器的级联设计法，并将此滤波器用于耳蜗模型的语音分析／合成中，得到了较好的效果．该种滤波器具有系数少、结构简单、设计快等优点，很适合于各种信息处理中数字滤波器的硬件实现．

A digital bandpass filter is obtained from an analog bandpass filter using bilinear transform. The formulas relating the digital filter's coefficients with its center frequency and bandwidth are also derived. A new cascade design for the digital bandpass filter is proposed by using the formulas. The filter is applied to the cochlear model based speech analysis/synthesis system and good result has been achieved. It is proved that the filter has few coefficients and simple structure, it is fast to design and appropriate for its hardware realization.