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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)

一个关于卫星导航方面的ekf滤波程序，请大家互相共享一下(a satellite navigation on the ekf filtering process, please share what each other)

精通MATLAB数字图像处理与识别 chapter9 代码(Proficient in MATLAB digital image processing and recognition chapter9 code)

基于matlab的切比雪夫-2型低通滤波器设计(Matlab based on the-2 Chebyshev-type low-pass filter design)

hereby i m submitting this file

利用matlab中的simulink仿真，建立了定轴齿轮和行星齿轮的的仿真模型(Using the simulink of matlab, the establishment of a fixed axis gear and planetary gear simulation model)

for WSN simulation this code may be used and the results are very usefull

LDPC的完整c语言开发源程序代码，可以直接运行，没有错误，里面含有文件： construct_matrix.cpp decode.cpp encode.cpp Gaussian_channel.cpp generating_matrix.cpp get_matrix.cpp LDPC_main.c(LDPC complete c language source code, can be directly run, no errors, which contains documents: construct_matrix.cppdecode.cppencode.cppGaussian_channel.cppgenerating_matrix.cppget_matrix.cppLDPC_main.c)

现代通信系统（matlab版）（第二版）配套源代码 John G. Proakis等著 刘树棠 译 电子工业出版社出版(modern communication system (Matlab version) (2nd Edition) source code supporting John G. Proak Liushutang is waiting for the translation of the electronics industry published)

velocity model of layer cake