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代码去注释，C++描述，趋势科技2011笔试题，修改网上一些版本的代码错误(Code to comments, C++ description, Trend Micro 2011 pen questions, modified version of the code line number of error)

this material is more suitable for students and technology enthusiasts wanting to learn more about the USRP hardware. it contains lots of information

基于USB数据采集便携式心电监护仪的设计(The design of the portable ECG monitor based USB data acquisition)

Arduino-PID-Library-master库函数，可以轻松实现PID控制，是Arduino的函数库。(Arduino-PID-Library-master library function, you can easily realize the PID control is the Arduino library.)

说明：  C++入门到精通，一本蛮不错的书，我看完以后觉得收获挺大的，希望大家会喜欢(C++ entry to the master, a very good book, I read, I felt the big harvest, we hope you like)

Visual C++语言提供了虚屏功能，利用它及Windows GDI图形函数，可编制出功能强大的图形处理程序。虚拟屏幕的原理是，首先定义一个虚拟设备描述表及一块位图象数据区，将本应在实际窗口的绘画处理转移到此图象数据区（这块图象数据区功能相当于视频存储区），绘画操作完成后可通过图象传递，将结果弹出到可视窗口。许多Windows环境的图形处理或CAD系统都采用了这种技术。如GIS软件Mapinfo、AutoCAD for Windows等，它们的图形操作功能如开窗、漫游等的基础都是建立在虚屏基础上，并且将操作界面都作成工具窗（一种特殊的窗口，客户区内规则地排列着图象按钮响应操作代码）的形式，直观、灵活且便于用户选择操作。VC++的CDC类、CBitmap类封装了对虚屏的操作，利用类的继承性，也可很容易的实现工具窗。(Visual C++ provides a virtual screen function, use it, and Windows GDI graphics functions, can be prepared in a powerful graphics program. The principle of the virtual screen, first define a virtual device description table and a bit image data area, the present should be transferred in the actual window painting processing of this image data area (this image data area function equivalent to the video memory area ), after the completion of the painting operation can be passed through the image, the results of the pop-up to the visible window. Graphics or CAD system for many Windows environment using this technology. GIS software Mapinfo, AutoCAD for Windows and other graphics operations functions such as windows, roaming the foundation are built on the basis of the virtual screen, and the operator interface made ​ ​ tool window (a special window, the client area regularly arranged in the form of image button in response to the operation code), intuitive, flexible and user-fri)

实现的模拟键盘代码，模拟ps2协议，可以与计算机相连实现键盘的功能，在keil c下开发的。-89s51 achieved through keyboard simulation code, simulation ps2 agreement with the computer keyboard connected to the functions of the c Keil under development(Realize analog keyboard code, analog ps2 agreement, can realize the computer connected to the keyboard functions in keil c developed.-89s51 achieved through keyboard simulation code, simulation ps2 agreement with the computer keyboard connected to the functions of the c Keil under development)

Flash可以播放的Flv文件格式提取工具，可以提取音频文件，只允许FLV文件中的音频文件为MP3格式。(Flash can play the Flv file format extraction tool to extract audio files and allow only FLV files to MP3 format audio files.)

matlab fir LPF least square error with zeroa weighted

具有数据插入、修改、删除、显示、和查询功能的电话簿管理程序。 数据包括：人名、工作单位、电话号码、和E-mail地址。 可对记录中的姓名和电话号码进行修改。 可增加或删除记录。 可显示所有保存的记录。 可按人名或电话号码进行查询。 附加功能： 可修改单个记录的各项内容。 可重新建立电话簿。 可按人名或号码进行排序。 可统计名片数目及可再添加数目。 可插入单个名片并不破坏原有顺序(With the data to insert, modify, delete, display, and query functions of the phone book management program. The data include: the names, work units, phone number, and E-mail address. Can be modified to record the name and phone number. Increase or delete records. You can display all the records kept. According to the names or telephone number for queries. Additional features: you can modify the content of a single record. Can re-establish a Phonebook. According to the names or numbers to be sorted. Statistical card number and add the number. Insert a single card does not destroy the original order)