K2

判断一组数据服从何种分布：正态分布判，断泊松分布判断，γ分布判断，指数分布判断，rayleigh分布判断(Determine a set of data obey what distribution )

mark_minutia for fingerprint

声音信号的延时和混响的实现，包括单回声滤波，多回声滤波及混响。(Sound signal delay and reverb to achieve, including single echo filter, multi-echo filtering and reverb.)

可以用一系列点拟合二次函数，得出拟合后的图形和原数据的图标(Two functions can be fitted with a series of points)

xwch_test.m是主测试文件；biaoji.mat存放滤波器系数；xiangweicha.m用FFT计算相位差。 仿真框架为： 1.标记信号和双音信号续接作为发送信号； 2.对双音中一个频率分量的相位做偏移，再经过一个低通滤波器（引入线性相位，模拟收发不能同步测量现象）后，作为收到的信号； 3.用一个检测信号对收发信号进行相关运算； 4.画出收发信号以及相关处理后的信号。找出相关信号的那个尖点，从而推算出收发双音信号0相位点； 5. 输入0相位点位置，计算相对相位差。(xwch_test.m is the main test file biaoji.mat store filter coefficients xiangweicha.m calculated using FFT phase difference. Simulation framework: 1. Mark signals and then as a two-tone signal continued to send signals 2. On a two-tone frequency components of the phase shift to do, and then through a low pass filter (the introduction of linear phase, simulation can not simultaneously send and receive measuring the phenomenon), the as received signal 3. using a detection signal of the transceiver signal correlation operation 4. draw send and receive signals and related processed signal. Correlated signal of the cusp, which calculate the two-tone signal transceiver 0 phase point 5. Enter 0 phase point position, calculate the relative phase difference.)

matlab语言，用语保存数据，具体的save用法(matlab language, language save data, save a specific use)

一篇介绍ARMA时间序列模型定阶方法的文章，供大家参考。(a paper about order determination method for ARMA time series model .)

Simulation and Modeling of the PMSM Servo System

说明：  对机械类振动信号处理，幅值谱，相位谱，自功率谱，自回归谱等(For mechanical vibration signal processing, amplitude spectrum, phase spectrum, self power spectrum, auto regression spectrum, etc.)

说明：  通过矢量网络分析仪中的复介电常数和复磁导率来计算阻抗匹配(The impedance matching in microwave absorption can be obtained by inputting complex permittivity and permeability. Impedance matching can be obtained by inputting complex permittivity and permeability. Impedance can be obtained by inputting complex permittivity and permeability)