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：滤波 fs=400 采样频率,必须大于两倍基带信号最高频率 ts=1/fs 采样时间间隔 T=5 时间窗大小 t=0:ts:T (hf1=zeros(1,N) hf1(f<=B1&f>=-B1)=1 y1=hf1.*fftshift(y) figure subplot(211) plot(f,abs(fftshift(y))/N,f,hf1, r-- ) axis([-fs/2,fs/2,0,1.2]) title( 原信号频谱 ) xlabel( f /Hz ) subplot(212) plot(f,abs(y1)/N) title( 低通滤波，截止频率90Hz ) xlabel( f /Hz ))

说明：  MATLAB编写的ode45求解转子系统动力学程序，可用于计算响应和临界转速，程序正常可运行，主程序和函数放在同一个txt文件中。(Ode45 program written in MATLAB for solving rotor system dynamics can be used to calculate response and critical speed. The program can run normally. The main program and function are in the same TXT file.)

内有两个MATLAB程序，主要用于语音增强：一个用于向纯净语音文件(wav)添加高斯白噪声，信噪比可选；另一个文件用于测量语音信噪比，对语音增强效果判断(MATLAB, there are two procedures, mainly used for speech enhancement: one for the pure audio files (wav) add white Gaussian noise, SNR optional another document used to measure the voice signal to noise ratio, the effect of speech enhancement judge)

支持向量机的相关程序：包括了支持向量机在图像处理中的多个用处(Support vector machine procedures: including support vector machines in a number of useful image processing)

matlab lagrange程序，适合大家编辑matlab 的拉格朗日程序文件，分析。(matlab lagrange program，it is suitable for programmer use lagrange original program to solve relative problem。)

利用粒子滤波方法，实现目标跟踪的例子。能够直接运行。(Using particle filtering method to achieve target tracking .It can be run directly.)

B样条曲线曲面的生成与显示，用matlab实现(B-spline curve and surface generation and display, using matlab implementation)

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针对在学习Matlab的GUI设计中遇到的常见错误的解答(matlab GUI design common errors)

agood book for learning fuzzy clips