一种新型伪镜像滤波器组的实现方法

本文提出了一种新型２Ｍ个通道伪镜像滤波器组的结构和设计方法。本设计方法中，低通原型滤波器采用两级级联线性相位ＦＩＲ的结构，并使得整个分析／综合系统性能近于全恢复，无群时延失真。应用此方法设计伪镜像滤波器组，分析和综合滤波器组的结构和设计方法都比较简单，算法效率高，实现比较容易，这类滤波器组可用于语音的子带编码等。本文最后给出了一个实例。

A New Realization Method of Pseudo-QMF Banks

in this paper, we propose a new structure and designing method for 2M-channel pseudo-QMF banks. In our scheme, the prototype low-pass filter is composed of two cascade linear phase FIR filters. The performance of whole analysis /synthesis system is approximated to perfect-reconstruction and no group delay distortion. The pseudo-QMF banks designed by our proposed method are simple in structure and easy in designing and realization. This kind of filter banks are very suitable for voice subband coding application. A practical design example is given.