实验四

对于无法实现硬件定时的数据卡来说，这个vi提供了软件定时的功能(For data cards that cannot achieve hardware timing, this VI provides software timing capabilities)

在vc环境下调用labview下生成的dll库在vc环境下调用labview下生成的dll库(Vc calls in labview environment generated dll library vc environment in labview generated call dll library)

一本很不错的英文LabVIEW书籍，详细阐述了labview的设计思想和范例。(a very nice book talking about how to design a good LabVIEW program.)

列表框选择Demo ,网上找的,Labview列表带复选框(List box to select Demo, online search, Labview list with check box)

智能粮仓安全测控系统，支持注册人员登陆，登陆信息数据库管理，双向串口通信，模拟、数字电压采集，测试报表打印，测试数据数据库管理等(Safety monitoring system of intelligent granary, support the registration personnel landing, landing information database management, bidirectional serial communication, analog, digital voltage acquisition, test report print, test database management etc.)

本程序使用labview图形化语言编写了一款简单的推箱子游戏，该程序实现了此类游戏基本的功能和要求(This program uses LabVIEW graphical language to write a simple box game, the program implements the basic functions and requirements of such games)

使用LabVIEW实现了DDS芯片AD9833的编程助手的功能，输入晶振频率和想要的输出频率即可得到控制字。很方便编程。(Using LabVIEW to implement the function of the DDS chip AD9833 s programming assistant, you can get the control word by typing the oscillator frequency and the desired output frequency. It s easy to program. )

用户自行输入所需要的频率和占空比，得到PWM波(Users input the required frequency and duty cycle to get the PWM wave.)

航空航天通信技术一般采用模拟通信的频率调制和数字通信的移相键控调制方法。这有利于充分应用信道带宽和能源。频率调制是在一定程度上改变载波或副载波的频率来传输信息的调制方法。移相键控调制是利用载波或副载波的相位跳变来传输信息的调制方法。移相键控又分二相移相键控、四相移相键控和多相移相键控，其中以四相移相键控和八相移相键控调制方法的效率较高(Aerospace communications technology commonly used analog communication of frequency modulation and the digital communication phase shift keying modulation method. This is helpful for making full use of channel bandwidth and energy. Frequency modulation is changed to some extent carrier or subcarrier frequency to transmit information modulation method. Phase shift keying modulation is the use of carrier or subcarrier phase jump to transmit information modulation method. Phase shift keying and binary phase shift keying, four phase shift keying and multiple phase shift keying, of which four phase shift keying and eight phase shift keying modulation method of high efficiency )

虚拟仪器Labview：FFT、采样、加窗、互相关分析仪、滤波器、谱分析、随机信号分析仪、信号发生器.exe自谱与自相关分析.exe的可执行程序(FFT, sampling, windowing, cross-correlation analysis instrument, filter, spectrum analysis, the random signal analyzer, signal generator exe autospectrum autocorrelation analysis exe executable program)