ch4

说明：  ：针对MP3 编码方式和帧结构进行分析，利用帧中的比例因子提出了一种压缩域水印算法。算法通过引入帧变化分析步 骤，很好地实现了水印的自适应嵌入。对于不同的系统要求，还可以通过修改门限信噪比的值SNRlim按需进行水印嵌入，使算法 具有更大灵活性。同时在牺牲一定的嵌入空间前提下，实现了水印信息的自同步。实验表明，对于不同风格的音乐，该水印算法 具有很好的不可听性。(In this paper，the encoding method and the frame structure of MP3 are expounded in detail，a watermark algorithm is proposed based on the scale factor in MP3 frame.By introducing the step of frame altering analysis，the algorithm can realize that watermarks is embedded adaptively.By modifying threshold SNRlim（the ratio of signal to noise），the algorithm can meet different requirements of some system，that is what enable the algorithm to have a bigger flexibility.Based on expense of some embedding positions，the watermark can be embedded with self-synchronization.The experiment results show this algorithm can get a good audio effect with various types of audio.)

MatLab is a eery popular software is used in most labs(eery MatLab is a popular software is used in most labs)

相空间重构及奇异值分解代码，可用于消噪处理，希望有所帮助(Phase space reconstruction and singular value decomposition code, can be used to eliminate noise processing, Hope that helps)

定义法求杜芬方程的分岔图，定义法求杜芬方程的分岔图(Bifurcation diagram is defined by the Method of Duffing equation)

介绍窗函数的一些概念，是一个很好的实验报告(Window function design method of FIR digital filter)

被控对象为两惯性模型，调节器为PI调节器并在系统中加入了整数阶干扰观测器(Inertial model for the two charged objects, regulator for the PI regulator and in the system by adding the integer-order disturbance observer)

dds simulation codle

Its the source code for implementing WIMAX in NS-2

说明：  地球物理勘探过程中对地震记录数据进行FK偏移(Geophysical exploration during the course of FK offset seismic data recorded)

deconvolution, multiframe, deblurring