doa

巴特沃特带阻滤波器的设计，返回分子分母多项式系数，还可以作出增益曲线，以及求出相位响应以及群延时响应(Batewote band stop filter design, the return of molecular denominator polynomial coefficients, can gain curve, and the calculated phase response and group delay response)

说明：  MATLAB的实用经典程序3，可使初学者在短时间内较快掌握MATLAB中的一些基本函数(MATLAB utility classic program 3 will enable beginners to master quickly in a short time some of the basic function of MATLAB,)

Vector fitting for Transformer Identification

基于MATLAB的升降压斩波电路的仿真，可以调节负载和占空比来观察波形的变化(Based on MATLAB buck chopper circuit simulation, you can adjust the load and duty to observe the waveform changes)

对列车平稳性实验数据处理的MATLAB程序代码，涉及文件导入，时域图像绘制，数据处理，傅里叶变换，频域图像绘制，平稳性指标计算(I can t speak English.)

Histogram equalization

说明：  小波插值（全小波插值，小波双线性插值，小波双三次插值及其改进）放大图像，提高图像的分辨率；对插值图像做质量评价（峰值信噪比PSNR；均方信噪比SNR）(Wavelet interpolation (full wavelet interpolation, wavelet bilinear interpolation, cubic interpolation and improved method) to enlarge the image and improve image resolution assesse the interpolation image (peak signal to noise ratio PSNR mean square signal to noise ratio SNR))

基于active-set 的SQP算法，用于求解非线性不等约束(SQP algorithm used to find a constrained minimum of a function of several variables based on active-set algorithm, subject to the nonlinear inequalities.)

收集的几个无刷直流电机控制系统仿真例程，matlab中可直接运行，很有借鉴意义。(Several brushless DC motor control system simulation routines , they can be directly run in matlab.)

Matlab code for PSNR for G723.1 coder