Problem1

用MATLAB实现高斯白噪声系统输入信号的随机输出(Gaussian white noise with a MATLAB implementation of the random input output system)

本文为Stephen J.Chapman《MATLAB 编程（第二版）》英文影印版的中文译本，这本 书对初学者很好的入门教材。(The the Stephen J.Chapman MATLAB Programming (second edition) " The Chinese translation of the English photocopy edition, this book is good for beginners introductory textbook.)

录制一段自己的语音信号，并对录制的信号进行采样；画出采样后语音信号的时域波形和频谱图；给定滤波器的性能指标，采用窗函数法和双线性变换设计滤波器，并画出滤波器的频率响应；然后用自己设计的滤波器对采集的信号进行滤波，画出滤波后信号的时域波形和频谱，并对滤波前后的信号进行对比，分析信号的变化；回放语音信号；最后，设计一个信号处理系统界面。(Section of their own voice recording signal, and recording the signal sampling draw sample after the speech signal time-domain waveform and frequency spectrum given filter performance indicators, using a window function method and bilinear transformation design of filters, and draw the frequency response filter then use the filter of their own design for the signal acquisition filtering, after filtering the signal to draw the time-domain waveform and spectrum, and filtering of signals before and after contrast, analysis of signal changes playback voice signal Finally, the design of a signal processing system interface.)

说明：  自己编的付里叶变换，对学习者有很大帮助　(own series of the Fourier transform, to be of great help learners)

一个2D的FDTD模拟算例，包括完整的定义、初始化、更新方程、显示和FDTD迭代文件。该算例适合初学FDTD的人员掌握完整流程。(A 2D FDTD simulation examples, including a complete definition, initialization, update equations, display and FDTD iteration file. This example is suitable for beginners FDTD personnel to master the complete process.)

Gardner定时算法 matlab仿真。QPSK、16qam，反馈环路(Gardner timing algorithm matlab simulation. QPSK, 16qam, the feedback loop)

计算简支梁在多个集中力，均布载荷，力偶同时作用时的剪力，弯矩并绘制其图形(Simple beam calculations in a number of concentrated force, uniformly distributed load, Couple add at the same time, the shear stress, moment and draw its graph)

its about image segmentation

Newmark beta code for SDOF structures

说明：  研究分岔软件,最全最强大的非线性系统动态分岔与混沌分析软件(Research bifurcation software, the most powerful dynamic bifurcation and chaos analysis software for Nonlinear Systems)