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本文主要阐述了DTMF的原理及如何在MATLAB上产生DTMF信号，主要涉及到电话拨号音合成的基本原理及识别的主要方法，利用 MATLAB 软件以及 FFT 算法实现对电话通信系统中拨号音的合成与识别。并进一步利用 MATLAB 中的图形用户界面 GUI 制作简单直观的模拟界面。 能够利用矩阵不同的基频合成 0 － 9 不同按键的拨号音，并能够对不同的拨号音加以正确的识别，实现由拨号音解析出电话号码的过程，完成对电话拨号音系统的简单的实验仿真。-This paper described the principle and how DTMF in MATLAB to generate DTMF(This paper describes the principle of DTMF and how MATLAB to generate DTMF signals, mainly related to the telephone dial tone and identification of the basic principles of synthesis of the main method, using MATLAB software, and the FFT algorithm to the telephone communication system, the synthesis and identification of dial tone . And further the use of MATLAB' s graphical user interface simple and intuitive GUI make the analog interface. Able to use a different fundamental frequency matrix synthesis of 0- 9 different button dial tone and can be different correct identification of dial tone to achieve by the dial tone of the process of parsing a telephone number to complete the telephone dial tone system, a simple experiment simulation.-This paper described the principle and how DTMF in MATLAB to generate DTMF)

qpsk位同步源程序 包括调制解调及信道加噪等(qpsk bit synchronization source, including modulation and demodulation and channel plus noise, etc.)

电网络matlab编程：已知节点，求电网络的基本回路矩阵，基本割集矩阵,动态节点优化，存储查找，求因子表等(matlab example)

pi/4-dqpsk 调制解调 的 matlab 仿真，通过srrc滤波器实现16倍的上采样(pi/4-dqpsk modulation and demodulation matlab simulation, through srrc filter to achieve 16 times the sampling)

Increase the simulation time in the script, the simulated and theoretical results should converge • Use a pulse shaping filter at the transmitter • At the receiver, precede the discrete-time integrator with a multiplier by a replica of the transmitted pulse to construct a correlator

通过修改INP文件中的铺层信息及材料属性信息，得到层合板等效模量及极限强度(Equivalent modulus and ultimate strength of laminates can be obtained by modifying the information of lamination and material properties in INP file.)

kalman 滤波器，初学者的参考,最好先学习一下其推到过程(kalman filter, the reference for beginners, it is best to first learn about the process of pushing)

This is my simulation of PMSM. Hope you can edit and use it to your exercise. It is not actually correct but I think it will be useful for you.

CR1DMOD is the main function in a 1D forward modelling package which has the capability of modelling Complex Resistivity effects. A call to CR1DMOD will open the main gui interface, from which layered earth models can be created and measurement configurations defined.

增加了声子晶体周期条件： if (mod(ii,19)<9) u(ii,3)=2*u(ii,2)-u(ii,1)+c*(u(ii+1,2)-2*u(ii,2)+u(ii-1,2)) else u(ii,3)=2*u(ii,2)-u(ii,1)+0.5*c*(u(ii+1,2)-2*u(ii,2)+u(ii-1,2)) end(if (mod(ii,19)<9) u(ii,3)=2*u(ii,2)-u(ii,1)+c*(u(ii+1,2)-2*u(ii,2)+u(ii-1,2)) else u(ii,3)=2*u(ii,2)-u(ii,1)+0.5*c*(u(ii+1,2)-2*u(ii,2)+u(ii-1,2)) end)