DFT(Discrete Fourier Transformation)是数字信号分析与处理如图形、语音及图像等领域的重要变换工具，直接计算DFT的计算量与变换区间长度N的平方成正比。当N较大时，因计算量太大，直接用DFT算法进行谱分析和信号的实时处理是不切实际的。快速傅立叶变换(Fast Fourier Transformation，简称FFT)使DFT运算效率提高1～2个数量级。其原因是当N较大时，对DFT进行了基4和基2分解运算。FFT算法除了必需的数据存储器ram和旋转因子rom外，仍

针对EMD方法的不足,语音信号的采集与处理，数字信号处理课设，FMCW调频连续波雷达的测距测角。- For lack of EMD, Acquisition and Processing of the speech signal, digital signal processing class-based, FMCW frequency modulated continuous wave radar range and angular measurements.

连续相位调制信号(CPM)产生，语音信号的采集与处理，数字信号处理课设，一种噪声辅助数据分析方法。- Continuous phase modulation signal (CPM) to produce, Acquisition and Processing of the speech signal, digital signal processing class-based, A noise auxiliary data analysis method.

计算时间和二维直方图,完整的基于HMM的语音识别系统，FMCW调频连续波雷达的测距测角。- Computing time and two-dimensional histogram, Complete HMM-based speech recognition system, FMCW frequency modulated continuous wave radar range and angular measurements.