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bai thi cho cac ban Vien Thong DHCN

一个简化的H.261视频编码方案，最后显示两张图压缩编码后的压缩比(a simple h.261 video coding method, and finally display the compress rate of two pictures.)

一个chirp信号，用来描述连续震动的正弦函数。(A chirp signal, which is used to describe the sine function of continuous vibration.)

利用matlab离线处理数据实现经验模式分解（EMD）算法(Offline data processing using matlab to achieve empirical mode decomposition (EMD) algorithm)

说明：  学习MATLAB中的关系运算和逻辑运算，掌握它们的表达形式和用法。掌握MATLAB 中的选择结构和循环结构。学会用MATLAB进行M文件的编写和调用。 (Learning MATLAB relational and logical operations, control their expression in the form and usage. Master MATLAB selection structure and loop structure. Learn to write and call the M-file with MATLAB.)

它是基于matlab的语音分帧的代码，相信对大家理解有帮助。(It is based on the matlab voice sub-frames of the code, I believe we understand help.)

说明：  用模式传输法计算多模干涉波导的模场传输,多模干涉波导参数可调(calculate the beam propagation inside MMI using mode propagation method)

CSMA-CAalgotithm算法matlAB的实现！(The implementation of the CSMA-CAalgotithm algorithm matlAB)

详细介绍了数组高精度数，通过这个资料可以很好的学习如何使用(Introduces in detail to solve the array degree, through this material can be very good learning how to use )

本程序在MATLAB开发环境下，用周期图谱估计的方法对信号的频谱进行了估计，估计结构为两个频率分量。(The procedure developed in the MATLAB environment, with the cycle map estimation method to estimate the signal s spectrum, estimated structure for the two frequency components)