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说明：  最近看到有人提问怎样用FFT实现频谱分析，我认为能够进行到频谱分析的人，对于系统研究的深度基本上已经相当不错了。本人今天做了一个例程，发给大家参考一下。 历程主要内容(signal_analyzer.rar)如下： test1.txt 第一列为时间t，0.001s为步长；第二列为系统的输入信号；第三列为系统的输出信号。 signal_analyzer.m首先将test1.txt 的数据读入workspace，然后进行FFT，分析出两信号的频率，输出对于输入的幅值衰减（db），输出对输入的相位差。(The question was asked recently to see the realization of how to use FFT spectral analysis, I think that spectral analysis can be carried out to those who study the depth of the system basically is already quite good. Today I made a routine, distributed to Members for reference. The main contents of the course (signal_analyzer.rar) are as follows: test1.txt the first time as t, 0.001s for the step the second as the system input signal the third as a system output signal. signal_analyzer.m first test1.txt data read into workspace, and then proceed to FFT, analysis of the two signal frequency, output amplitude for input attenuation (db), the output of the input phase difference.)

说明：  基于matlab的桁架有限元分析，对理解位移法的有限元分析非常有帮助(finite element analysis with matlab)

主动表观模型matlab程序,人脸几何特征标定(Active apperance model Matlab programming)

这是一段GPS信号产生的程序，里面包括对不同卫星星号产生的扩频码，同时以及产生对应的GPS信号。(This GPS signal is generated by a program section, which includes different satellites asterisk generated spreading codes, and simultaneously generates a corresponding GPS signal.)

基于FIR的有噪声语音信号处理 MATLAB处理(Noise based on the FIR of speech signal processing)

说明：  数据挖掘中经典算法的matlab代码，相当全面！(Classical data mining algorithm matlab code, quite comprehensive!)

tfrstft和tfrgabor不同窗函数，不同窗长度的时频性能分析。(tfrstft and tfrgabor different window function different window length, time-frequency analysis of performance. Note: The required frequency toolbox)

机械手运动学方程求解 。分别输入机械臂的末端坐标，求出第一组角度解 ，第二组角度解。(Manipulator kinematics equation. Manipulator, respectively, the end of input coordinates, the perspective of the first group obtained solution, and the second group of solutions perspective.)

主要阐述的是使用差分法解一类Bessel方程在不同边界条件下的离散解(elaborated in the main difference is the use of a solution like Bessel equation in different boundary conditions of the Discrete Solutions)

连续信号的采样与重构，主要说明信号采样与重构程序(continuous signal sampling and Reconstruction, the main note signal sampling procedures and Reconstruction)