信号制

The bridge loses balance and sensitive parts have a output signal,which will transform to related current signal after differential magnifying and conversion between current and voltage. Linear 4~20mADC standard signal is formed by compensation of magnifying and non-linear rectified ring circuit ,and second temperature compensation.

输出的电信号，经过差分放大，电压电流转换，变换成相应的电流信号，通过放大和非线性矫正环路的补偿，以及精密的二次温度补偿，产生与输入压力输成线性关系的4~20mADC 二次制标准信号。

Base on the principle, the main circuit and control circuit of 2-phase hybrid stepping motor systems are designed. The system can realize many functions such as fix-frequency pulse width modulation, current sampling, power magnifying, ring distribution, producing control signal, and so on.

完成了对二相混合式步进电动机微步驱动系统主电路及控制电路的具体设计，实现了恒频斩波、信号检测、环形分配、微步信号的产生等功能，并搭制了实验电路进行实验验证。

Compared to the ordinary PLL circuits, it can endure the short time appearance that occurs once in a horizontal line of the sync signal. It can adapt to the phase alternation character of a PAL video signal and recognize the phase alternation line. The local color sub-carrier can be generated for synchronous demodulation by the circuit.

该电路使用了全数字锁相环对色同步信号进行跟踪，与普通锁相环电路相比，它不仅能适应制视频信号中色同步信号每行出现一次和PAL制信号逐行倒相的特性，还能识别倒相开关信号，准确地产生本地色副载波用于同步解调。

The crystal oscillator provides frequency stable accurate 32768Hz the signal. After frequency divider frequency division to 1Hz stable accurate function signal,Does for the counter pulse signal. Six counter serial connections,Uses the decimal base and the senary counting separately (when ten for ternary notation counting). Comes out through 7448 decoders and the monitor appearances,The counting cycle is 24 hours.

晶振提供一个频率稳定准确的32768Hz的信号，经过分频器分频的到1Hz稳定准确的函数信号，做为计数器的脉冲信号，六个计数器串行连接，分别采用十进制和六进制计数，通过7448译码器和显示器显现出来，计数周期为24小时。

In order to improve ability of anti-jamming, nowadays output of many measure-control systems' sensor is three thready difference signal and differ voltage range. Commonly, this signal is transacted by complex circuit , then it is collected. In this way, hardware cost of system is increased and precision of system is reduced.

现在很多测控系统为了提高抗干扰的能力，传感器输出信号多为3线制的差分信号，而且电压范围也不同，通常采用的方法是把差分信号通过复杂电路进行处理后再进行数据采集，这样不仅增加了硬件成本，还使系统的精度降低。

ATbstract: he small frequency modulated transmitter, the power is small, may launch the wireless signal, accepts the signal with the radio, satisfies certain transmission range, Circuit easy system, low cost, power output does not exceed 5-8 mW, firing range to be in the housing area of about 100 meters, with an ordinary FM radio receivers, demonstrating his superb sensitivity and clarity, the most circuit design challenges of the part is only used 3 V power supply, and half-wave antenna will be such a launch capability.simultaneously can input the sound signal, may install modulation surveillance table to serve as the monitoring device, although the power is not very big, but should the interference protection normal radiobroadcasting signal.

小型调频发射机，功率小，可以发射无线信号，用收音机接受信号，满足一定的发射距离。电路简单易制，造价低廉，输出功率不超过5－8mW，发射范围在房屋区可至100米左右，用一部普通的FM收音机接收，显示其灵敏度和清晰度俱佳，电路设计中最富挑战性的部份就是只需用3V电源和半波天线便有如此的发射能力。同时能够输入声音信号，可安装调制监视表头用作监视器，虽然功率不是很大，但是应该防止干扰正常的无线广播信号。

The photoelectric detector changes the optical signal after receiving the electric signal, and then produces the binary code through A/D converter. The computer make the fuzzy deal according to the data; Finally, the computer sending out the orders of going forward or backwards shiftily, opening or closing the machine.

光电器件接收到光信号后转换成模拟电压信号，经A/D转换后产生二进制数字量，由微机读入后结合该值变化速率进行模糊处理，最后发出变速前进、变速后退及开机、关机命令，从而控制印刷品或制袋的运动及变速偏移，使彩色套印或分切制袋能准确正常地进行。

Conductive ink is a current flows of special business card printing and membership card making ink, it can be in different substrate business card printing and membership card making wire and antenna, the cards and membership cards produced by the antenna to receive reader by microwave signal, such as the American Flint lnk is conductive inks for major manufacturers.

导电油墨是一种允许电流流动的特殊制卡和会员卡制作油墨，它能在不同的承印物上制卡和会员卡制作导线和天线，制卡和会员卡制作的天线可接收阅读器所发射的微波信号，如美国的Flint lnk公司便是导电油墨的主要生产商。

A design and implementation method of the high speed modulation system, which adopted the new techniques of the FPGA and DAC based communication system,is presented in this paper. The effect of the key techniques of this system, such as the high speed digital signal processing for modulation, high speed based-band signal conversion, wide-band modulation, carrier suppression, high frequency and high precision system clock generation, is analyzed, and the solutions and performance analysis is also given. Finally, a high speed modulation system for space applications is implemented, can be used for high speed data transmission with QPSK, 8PSK, QAM or other kinds of digital modulation.

本论文依据正交调制原理，采用基于FPGA和DAC的设计技术，提出了一种高速、灵活的调制系统的设计方法，重点分析了系统组成的调制编码映射、基带脉冲信号转换、信号滤波、调制、系统时钟产生等关键技术环节的影响，解决了高速调制信号处理、高速数据转换、宽带调制、载波抑制、高频率高精度系统时钟的产生等关键技术问题，完成了一种适用于空间应用的高传输速率、多进制数字调制方式和调制体制灵活的数据传输调制系统的设计与实现，可在硬件设计不变的情况下，实现QPSK、8PSK和16QAM等多种调制方式的高速数据传输，QPSK调制速率达到500Mbps。

Broad signal source, compatible PAL system and NTIS make a video signal, but videoplayer , telecamera , TV video frequency export direct butt-joint with VCD , DVD , magnetic tape.

宽泛的信号来源，兼容PAL制和NTIS制视频信号，可与VCD，DVD，磁带放像机，摄像机，电视视频输出直接对接。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。