提取双谱切片函数，用于识别不同参数的MFSK信号-extracting bispectrum slice parameters for MFSK signal identification

对有限长序列进行DFT，用DFT来对连续信号进行谱分析，实现双线性变换法设计数字滤波器，处理音效-DFT for finite length sequences, spectral analysis of continuous signals with DFT, design of digital filters with bilinear transforms, processing of a sound effect