free-bird

this is a program to identify images from an image file

超声仿真软件，基于MATLABB，用于声束合成技术可直接使用。 (Ultrasound simulation software, based on MATLABB for beam synthesis technique can be used directly.)

二维绘图—MATLAB(有关matlab绘图的各种基本知识，实用)(2 d graphics- MATLAB)

级联积分－梳状(Cascaded Integrator–Comb，CIC)滤波器，是种高 效滤波器。它是一种线形相位FIR滤波器，由工作在高抽样率的级联理 想积分器和低抽样率的级联微分器组成,根据抗混叠和抗镜像的指标 确定所需的级联数目。 (Cascaded integrator- comb (Cascaded Integrator-Comb, CIC) filter, is the kind of high efficiency filter. It is a linear phase FIR filter, high sampling rate by the work in the cascade of an ideal integrator and a low sampling rate of the cascade differentiator formed, according to anti-aliasing and anti-mirror of the indicators to determine the number of required cascade.)

一个按自己意愿设计子图和轴外注释的小程序，很具有个性化。(A small program to design figure and explanation of outer axes according to one s own willingness, with personal characteristics.)

时频分析的toolbox，可以用于<Matlab时频分析技术及其应用>一书(time-frequency analysis of the toolbox, which can be used)

由matlab实现的HMM，两个文件可以相互参考(Implemented by the matlab HMM, the two files can refer to each other)

说明：  该文件可实现杨氏双缝干涉仿真，效果nice(This file can realize the simulation of Young's double slit interference, and the effect is nice)

自己制作的基于循环谱的FAM算法，可以调试一下。(Make your own FAM algorithm based on cyclic spectrum, can be debugged.)

九位m序列，用于直接序列扩频通信系统编程(Nine m sequence for direct sequence spread spectrum communication system programming)