离轴全息记录与再现

I upload matlab code of Tracking servo system

map algorithm for turbo codes in matlab the simulation, using 1 / 2 code rate rsc and 2 - random interleaver

二级涡轮蜗杆传动减速器，完整装配图，供各位课程设计参考用(Two worm gear reducer, the complete assembly drawings, curriculum design reference for you)

用于绘制双曲地震同相轴，以便后续的处理工作，非常有用(draw hyperbolic events)

power_Transfo3phCoreType_Sat.rar,功率电子领域matlab仿真文件，已经验证过，程序运行正常(power_Transfo3phCoreType_Sat.rar,Power electronics field matlab simulation file, has already been verified, the normal operating procedures)

Corrigé d une epreuve de l electrotechnique

二维相位解包裹算法。主要基于结构光采集以及其他需要对于包裹相位进行解相的算法。包括最小枝切法以及相位图法。(2D unwrap algorithm mainly based on the structure light)

，用MATLAB实现快跳频通信系统的仿真。主要应用了SIMULINK和COMMUNICATION BLOCKETS两个模块。整个设计包括了信源产生部分、发送部分、跳频调制部分、信道部分、接收部分和结果分析部分共六个模块，核心技术是伪随机序列的产生和频率合成器的设计，而关键技术是收发两端的伪随机码元的同步。伪随机码的产生用S－函数编程来开发自己的SIMULINK模块。同步的实现是收发两端采用相同的扩频脉冲触发。而且在设计中每个模块都采用了模块封装技术，从而简化了框图结构(Using MATLAB to achieve fast frequency-hopping communication system simulation. The main use of SIMULINK and COMMUNICATION BLOCKETS two modules. The whole design, including part of the generated source, sending part of some frequency-hopping modulation, channel of the receiving part and the results of analysis of part of a total of six modules, the core technology is the emergence of pseudo-random sequence and frequency synthesizer design, and the key technology is the transceivers at both ends of the pseudo-random synchronization symbol. Pseudo-random code generated by S-function programming to develop their own modules SIMULINK. Synchronization is used to send and receive ends of the same spread-spectrum pulse trigger. But also in the design of each module using the module packaging technology, which simplifies the structure of the diagram)

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.)

说明：  matlab函数，很多有用的matlab函数。希望对大家的学习有用。(matlab function, a lot of useful matlab functions. Hope to learn useful.)