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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.)

是小学期课程设计的题目，小波包分析提取振动信号中的特征频率，音频信号通过LM386放大。( Is the topic of the elementary school stage curriculum design, Wavelet packet analysis to extract vibration signal characteristic frequency, LM386 audio signal amplification.)

计算心电信号RR间隙的一个算法，主要用户分析心率变异使用，也可以集成到HOLTER中(ECG RR calculated a gap algorithm, the main users of the use of heart rate variability analysis can also be integrated into HOLTER in)

BPSK 数字调制与解调 运行环境 matlab simulink(BPSK Digital Modulations and demodulations in SIMULINK. )

本程序是码分多址系统即CDMA系统的编码和解码仿真程序(this procedure is that the CDMA CDMA system of coding and decoding simulation program)

先进PID控制 MATLAB仿真 第2版 刘金琨等编.pdf (MATLAB simulation of advanced PID control 2nd Edition Hangzhou Press, eds. Pdf)

一个50行的Matlab有限元程序（二维传热问题），执行fem2d.m即可。(A 50-line Matlab finite element program (two-dimensional heat transfer problem), the Executive fem2d.m can.)

这是一个关于异步电机无速度传感器的仿真模型，采用参考模型自适应(sensorless control of the IM based on the MRAC)

说明：  vectoriel control of synchronious machines

pso alghoritm for different function