数字输入输出系统

The design of the interface modules of the control system is the following work. They were the interfaces connecting controller with digital, analog network, and the monitor computer respectively.

紧接着展开了对控制系统通信部分的研究开发工作，结合相关的芯片技术，设计了系统的数字通信模块、模拟通信模块、监控计算机通信模块；在现场模拟量的输入／输出模块，利用两片8255扩展了48个I／O端口，实现对现场设备的远程控制。

This technique uses a spiral phase plate with a small central aperture placed on the Fourier plane of an imaging system. If the spiral phase filter is rotated by a certain angle around its central axis,a phase shift between the zero-order spatial frequency component and the remaining of the object is produced,and the magnitude of this phase Shift is proportional to the rotation angle. Using this property,we can record a sequence of intensity distribution of the output beams corresponding to different rotation angles,and then digitally reconstruct the objects by using a phase-shifting algorithm. Both the theoretical analysis and simulation experiment results demonstrate the feasibility of this approach.

在成像系统的频谱面上放置中心带有一通光孔径的螺旋相位板，在输出面上记录输入物体经螺旋相位滤波后的输出像；将螺旋相位滤波器绕轴旋转一定角度，通过中心光孔的零频成份与其他高频成份间会产生与旋转角度成正比的相移；利用这一特点，通过记录多幅对应不同旋转角度的输出光场强度分布图，然后再用一定的相移算法实现被记录物体相位分布的数字再现。

And due to the nature of the data acquisition, three data acquisition circuit board are adopted. They are voltage to digit data converting circuit board, current to digit data converting circuit board and digit data input/output circuit board. These circuit boards are used to acquire the main running parameter of the multifunctional experimentation equipment and to control the output of alarm message.The monitor and control program is developed on Delphi5.0 which is an excellent product of Borland Corp.

数据监控系统的硬件以一台工业控制PC机为核心，并根据采集信号的性质配置了电压-数字量转换板、电流-数字量转换板及开关量输入／输出板，对实验台的主要运行参数进行采集并进行报警控制；监控系统的软件以BORLAND公司的Delphi5.0作为开发平台，采用了面向对象的设计方法，运用了多线程、数据库等技术，做到了界面美观、操作方便。

The three characteristic parameters as input,we obtain the apple grade based on fuzzy al

要由苹果的大小、形状和成熟度决定；该分拣系统有三个输入参数即大小、形状和成熟度，其三个特征参数的提取应用了数字图像处理技术；一个输出变量即苹果等级分类，分别标为A、B、C三类。

Collins formula, which describes the diffraction of light wave passed through a near-axis optical system, and its inverse calculation expression are presented in this paper. The object plane and charge coupled device detector plane which are used in the study of digital holographic detect, are treated as the input and output planes of an ABCD system.

给出描述光波通过傍轴光学系统衍射的柯林斯公式及其逆运算表达式，然后将数字全息检测研究中的物平面及CCD探测平面视为ABCD系统的输入平面及输出平面，提出通过柯林斯公式的逆运算进行波面重构的一种计算方法。

The former is the core of hardware, it is based on industrial control computer that expended with analog signal input board and digital signals input and output board.

其中工控机是自动化测试系统的硬件核心，在工控机内扩展了数据采集卡和数字量I/O卡，完成对电源输入、输出信号的采集和对系统的控制。

Circuit system used varistor constitute the Wheatstone bridge to collect small changes in voltage, After amplification circuit amplified into A / D converter circuit, the input voltage digital signal after the conversion output AT89S52 conducted by the control and data processing and results in the LCD display.

系统电路采用压敏电阻构成惠斯登电桥来采集电压的微小变化，经过放大电路放大后送入A/D转换电路，对输入电压信号进行数字量的转换后输出，由AT89S52进行系统的控制和对数据的处理并将结果显示在液晶显示器上。

Besides,the characters and functions of the chips are also analyzed and depicted. The CPU is TMS320VC5409, the hardware is designed according to the function modules, these modules are power supply module、signal opsonic module、data processing module、time clock module、UART module and pulse output module.

系统的核心是数字信号处理器的TMS320VC5409，以模块化的设计方法将仪表的硬件按功能分为几大模块进行设计，分别为：电源模块、输入调理模块、数据处理模块、时钟模块、通信模块、脉冲输出模块。

This brought fixed cost, but it also is meant at the same time use a source to won't make you singlehanded assume a problem.

这带来了一定的成本，但它同时也意味着使用开源不会让你独力承担问题。

He gained a small fortune in real estate.

他在房地产上发了一笔小财。