查询词典 logical circuit

The hardware design project and principle are presented in detail, including the sensor and the single-chip microcomputer select, the signal processing circuit, the real-time clock circuit, the alarm circuit, the wireless receiving and transmitting circuit, the extension of FLASH memorizer, the key-board circuit and USB interface circuit, etc. As the counterpart, the software function modules are presented as well, including the main program of transmitter and receiver, the data acquisition and processing module, the display function module, the key function module, the three-level alarm on fault parameters module, the fault parameters memorizing and inquiring module and the wireless transmitting and receiving module, etc.

论文详细介绍了系统的硬件设计方案及其工作原理，包括传感器的选择、单片机的选择、信号调理电路、实时时钟电路、报警电路、FLASH存储器、无线发射与接收电路、键盘电路和USB接口电路等；同时详细介绍了软件设计方案及具体实现方法，包括发射机主程序、接收机主程序、数据采集与处理模块、键盘处理模块、故障数据存储与查询模块、显示功能模块、报警模块、无线发射与接收模块等。

The overall system controls by the monolithic integrated circuit, by ultrasonic wave transmission circuit, supersonic reception electric circuit, alarm circuit, supply voltage examination/Repositions the electric circuit, composition and so on keyboard display circuit.

本报警器采用超声波传感器测距，整个系统由单片机控，由超声波发射电路，超声波接收电路，报警电路，电源电压检测/复位电路，显示电路等组成。

An image display apparatus includes a display having data holding function, a vertical drive circuit sequentially and selectively scanning matrix form display elements, and a horizontal drive circuit writing a voltage among binary voltage preliminarily assigned depending upon the digital data of the image signal. The horizontal drive circuit and the vertical drive circuit are operated for performing selective scan of respective display element for at least m times in one frame period. The vertical drive circuit is constituted of n number of sequence circuits and logic operation circuits for outputs of the sequence circuits, where n is smaller than m, a period from inputting to the sequence circuit to outputting from the final stage being less than or equal to half of one frame period, and at least one of the sequence circuits being used with selectively inputting a plurality of inputs.

提供了一种图象显示器，其具有显示部，在矩阵上排列的象素内保有数据保持的功能，根据保持的数据进行显示；垂直驱动电路，对构成显示部的矩阵状显示器以每行按顺序作选择性扫描；以及水平驱动电路，对于由垂直驱动电路选择的行显示器件，根据应显示的图象信号数字数据，从预先分配的二进制电压中写入电压，并利用水平、垂直驱动电路，与应显示的图象信号同步，在1帧期间至少m次对各显示象素进行选择性操作，以此进行多色调显示，垂直驱动电路由满足n＜m的n个顺序电路和其输出的逻辑运算电路组成，顺序电路的输入从最后级输出为止的期间为1帧期间的1/2以下，并且，n个顺序电路的至少一个的输入是切换多个输入系统而使用。

Logical atomism that has some significance more or less which requires us to think about seriously, like any significant philosophical ideology includes three points:(1) logical atomism developed Ernst March's comtism;(2) It directly affected Vienna Circle on behalf of logical comtism and the philosophy of language analysis;(3) It suggested the scientific realistic approach and rational approach.fourth, the difficult and reason of searching certain knowledge of logical atomism.

逻辑原子主义同历史上任何有影响的哲学思想一样，或多或少有一些价值值得我们认真对待和参考，主要包括三点：(1)逻辑原子主义发展了马赫的实证主义；(2)它直接影响了以维也纳学派为代表的逻辑实证主义和后来的语言分析哲学；(3)它体现了科学的求实精神和理性精神。四、逻辑原子主义寻求确定性知识的困难及其原因考察。

This paper precisely conducts the special topic research in view of some important technologies of the digitized control module.(1) AC motor control circuit of PAN/TILT is designed ,which speed is controlled by AT89C51 MCU. DC motor control circuit of LENS is designed too.(2) The hardware and software of automatic temperature control is designed, which used in camera protect box without A/D IC. A kind of single wire communication IC is used in the circuit. So, the program is given.(3) A method of video switch without picture shock is discussed in this paper, and 16x8 video switch circuit is designed. AT89C51 can carry out time sequence logical control with the sync signals by request..(4) The module of real-time clock is designed, in which, LCM is used, a kind of three-wire communication IC is used too.

1给出了一种由89C51单片机控制的简单易行的交流云台转动变速控制电路，实现了云台及其电动三可变镜头的控制；(2)给出了无需外加A/D、单线通信的防护罩自动温度控制电路，完成了单片机温度控制软件的设计；(3)提出了"无抖动"视频切换的设计思想，给出了16×8的视频切换电路，利用单片机在视频信号的场消隐期控制切换，从而实现了"无抖动"切换；(4)给出了一种三线接口通信的液晶显示实时时钟电路，完成了程序设计；(5)提出了在视频监控系统数字控制模块中，用CAN总线取代传统的RS-485总线，实现PELCO-P协议传输的方案。

It consists of circuitry that this constant current circuit stabilizes the criteria of a highly precise returned type constant current circuit of operation in another constant current circuit,Furthermore, the voltage amplification with very high stability is realized by adopting this constant current circuit also as the bias circuit of a first rank cascode and the 2nd step cascode, and the 2nd step constant current load intensity.

它由电路，这恒流电路稳定的标准，一个高度精确的返回式恒流电路的运行在另一恒流电路，此外，电压放大具有极高的稳定性，实现了通过这项恒流电路也作为偏见电路的第一级和第二栅栅一步，和第二步骤恒定电流负荷强度。

First introduction whole wave commutate electric circuit of work principle, immediately after introduction the electric capacity filter the function characteristics of an electric circuit, and in the electric circuit adoption exaltation stability, exaltation temperature stability and limit flow a type over flow protection electric circuit of concrete measure with insure an electric circuit safety stability of work.

首先介绍了全波整流电路的工作原理，接着介绍了电容滤波电路的性能特点，然后引入了具有放大环节和辅助电源的串联可调式稳压电源，并在电路中采用了提高稳定度，提高温度稳定性及限流型过流保护电路的具体措施，以确保电路安全稳定的工作。

Circuit principles, analogue circuit, digit circuit which laid me a solid foundation of circuit for the study of communication; the study of electronic circuit of communication provided me with the working principles of analog communication system; the study on communication theory made me grasp the working methods of digital communication; the study on electromagnetic field, electromagnetic wave and aerial let me know that how signals travel through signal paths and how to apply signal and linear system, random signal and system to the research of noise's impact on signals

学习了电路原理、模拟电路、数字电路打下了学习通信的电路基础；学习了通信电子线路掌握了模拟通信系统的工作原理；学习了通信原理掌握了数字通信的工作方法；学习了电磁场与电磁波、微波与天线了解了信号如何在信道中传输；学习了信号与线性系统和随机信号与系统来研究噪声对信号的影响。

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。

According to the demand of high magnetic field power supply, reference is increased with a set ramp rate and stops at a set stable value, so reference system is composed of digital setting and digit to analog converting circuit. But the stability of reference is mostly guaranteed by the performance of D/A circuit, so D/A circuit is particularly studied in reference system. The scheme of D/A circuit, the selection of DAC and its voltage reference, hardware anti-jamming design and PCB design are discussed in detail, and software of remote control and PLC are discussed in brief. Zero-flux DC current transformer well satisfies the demands of the high stability of Load current detection unit, so the principle of zero-flux DC current transformer is analyzed; in the mean time a project which detects the long term stability is designed. During 8 hours, analog signal which is detected with high precision digit multimeter is recorded in computer at 1HZ frequency by GPIB communication. The drift error source and related parameters are explained in the compare-amplify part. Detailed subtraction circuit is designed; also amplifier chip and periphery components are selected and verified according to the theory of error analysis.

根据强磁场电源的需求，参考源应按照软件设定的斜率逐渐上升到设定稳态值，则参考源系统应由数字给定和数模转换电路两大部分组成，而参考源的稳定度主要依靠完成数模转换功能的模拟电路的性能来保证，因此本文对参考源系统的研究以数模转换电路为重点，分别从电路方案的确定、数模转换芯片及其基准电压源的选取和验证、电路板硬件抗干扰和PCB设计几方面进行了论述，然后对数字给定部分的远控组态和PLC程序设计作了简要介绍；采用零磁通原理的直流电流转换器很好地满足了对负载电流检测单元高稳定度的需求，本文详细分析了零磁通检测的原理，并在选定此种类型电流转换器的基础上设计了一套检测长期稳定度的方案，8小时内以1秒为采样周期，通过计算机Labview程序和高精度数字电压表的GPIB通讯，将被高精度数字电压表数字化后的模拟信号采样值连续记录至计算机中；比较放大环节简要阐述了漂移产生的原因和相关参数指标，确定了具体的减法电路形式，并根据误差分析理论对运算放大器和外围元器件进行了选取和验证。

The circulation, consumption and reproduction of the trilogy have not only testified to its historical significance and literariness, but also invested it with new meanings.

该三部曲的流通、消费与再生产不仅验证了其历史意义及文学性，而切还赋予它以新的意义。

If he thought that he could buy me off, he would be wrong.

如果他认为他可以收买我，那他就大错特错了。