H.323是由ITU制定的通信控制协议，用于在分组交换网中提供多媒体业务。呼叫控制是其中的重要组成部分，它可用来建立点到点的媒体会话和多点间媒体会议。H.323定义了介于电路交换网和分组交换网之间的H.323网关（GateWay）、用于地址翻译和访问控制的网守（GateKeeper）、提供多点控制的多点会议控制器（MC）、提供多点会议媒体流混合的多点处理器（MP），以及多点会议控制单元（MCU）等实体
Developed by the ITU H.323 is a communication control protocol is used to provide multimedia services in the packet switched network. Call control is an important part of it, it can be used to establish media sessions between point-to-point and multi-media conference. H.323 defines the range of circuit-switched networks and packet switching network between H.323 gateways (GateWay), used for address translation and access control gatekeeper (GateKeeper), provides multi-point control of the multipoint controller ( MC), providing mixed multipoint multi-media stream processor (MP), and a multipoint control unit (MCU) and other entities (2014-10-31, WORD, 824KB, 下载1次)
Wiegand协议是国际上统一的标准，是由摩托罗拉公司制定的一种通讯协议。它适用于涉及门禁控制系统的读卡器和卡片的许多特性。
Wiegand protocol is a unified standard in the world, as well as formulated by MOTOROLA, a communication protocol.It is suitable for the entrance guard control system of the reader, and many features of the card (2014-10-13, WORD, 23KB, 下载3次)
环境监测数据编报是对环境监测数据按照国家标准进行综合分析和得以充分利用的重要途径。当前，全国各省市环境监测部门在数据编报上均存在不同程度的困难，一方面，各级监测站时常发生数据录入和计算错误、排放标准或评价标准使用错误、报告文字错误等监测数据质量问题；另一方面，环境质量和污染源监测的数据量大、业务频度高，手工逐个数据录入和审核数据十分浪费时间，而且没有校验约束，导致了数据及时性、完整性及准确性低，在此基础上进行的分析和评价面临着可信度低的难题
Environmental monitoring data report on environmental monitoring data is an important way to make full use of the comprehensive analysis and in accordance with the state standard. At present, the environmental monitoring department of the national various provinces and cities on the one hand data into different levels of difficulty, there are reports on monitoring stations at various levels, frequent data input and calculation errors, emission standards or criteria using the wrong word error, report to monitor data quality problems on the other hand, environmental quality and pollution source monitoring data big business, high frequency, hand data entry and audit data is a waste of time, and there is no check constraints, resulting in data timeliness, completeness and accuracy of the low, on the basis of analysis and evaluation are facing the problem of low reliability (2014-07-17, WORD, 931KB, 下载8次)
MF RC531 是应用于13.56MHz 非接触式通
信中高集成读写卡芯片系列中的一员。该读写卡
芯片系列利用了先进的调制和解调概念，完全集
成了在13.56MHz 下所有类型的被动非接触式通
信方式和协议。芯片管脚兼容MF RC500、MF
RC530 和SL RC400。
MF RC531 支持ISO/IEC14443A/B 的所有层
和MIFARE® 经典协议，以及与该标准兼容的标
准。支持高速MIFARE® 非接触式通信波特率。内部的发送器部分不需要增加有源电路就
能够直接驱动近操作距离的天线（可达100mm）。接收器部分提供一个坚固而有效的解调
和解码电路，用于ISO14443A 兼容的应答器信号。数字部分处理ISO14443A 帧和错误检
测（奇偶＆CRC）。此外，它还支持快速CRYPTO1 加密算法，用于验证MIFARE 系列产
品。与主机通信模式有8 位并行和SPI 模式，用户可根据不同的需求选择不同的模式，这
样给读卡器/终端的设计提供了极大的灵活性。
2.特
MF RC531 is applied to 13.56MHz contactless communication highly integrated chip card reader in a series. The card reader chip series use advanced modulation and demodulation concept completely integrated in all types of passive 13.56MHz contactless communication methods and protocols. Chip pin compatible MF RC500, MF RC530 and the SL RC400. MF RC531 supports all layers ISO/IEC14443A/B and MIFARE Classic protocol, and is compatible with the standard criteria. MIFARE contactless support high-speed communication baud rate. The transmitter does not need to increase the active part of the internal circuit can directly drive the operation of the antenna near distance (up to 100mm). The receiver part provides a robust and effective demodulation and decoding circuitry for ISO14443A compatible transponder signal. The digital part handles ISO14443A framing and error detection (Parity & CRC). In addition, it supports fast CRYPTO1 encryption algorithm used to verify the MIFARE products. Commu (2014-04-25, WORD, 344KB, 下载20次)
PLC输出电路(继电器_晶体管_晶闸管输出)区别和注意事项，通过可编程控制器实现输出的各种硬件电路
PLC output circuit (relay _ transistor _ thyristor output) differences and considerations to achieve the output of the programmable controller through a variety of hardware circuits (2014-03-12, WORD, 59KB, 下载4次)
MP3播放器是一种新兴的数字音乐播放器，播放MP3、WMA等格式的文件。通过用MPEG-1 Layer 3编码技术，可以得到大约12：1压缩的有损音乐信号。尽管MP3音乐是有损的，它在压缩过程中对功率谱较弱的信号有所丢失，但它同CD原声区别不大，不影响一般音乐爱好者对音乐的欣赏。MP3大大缩小了声音文件的长度，使音乐的存储和传输更方便。
The MP3 player is a new digital music player, play MP3, WMA and other file formats. About 12:1 compression with MPEG-1 Layer 3 coding technology, can be detrimental to the music signal. Although the MP3 music is detrimental to the weak signal power spectrum has lost in the compression process, but it is not much different with the CD soundtrack, does not affect the general music lovers for music appreciation. MP3 greatly reduced the length of the sound files, and more convenient storage and transmission of music. (2012-07-08, WORD, 369KB, 下载11次)
对最流行电路解决方案和他们的性能进行了分析，这包括寄生部分的影响、瞬态的和极限的工作情况。整篇文章开始于对MOSFET技术和开关工作的概述，随后进行简单的讨论然后再到复杂问题的分析。仔细描述了设计过程中关于接地和高边栅极驱动电路、AC耦合和变压器隔离的解决方案。其中一个章节专门来解决同步整流器应用中栅极驱动对MOSFET的要求。
The most popular circuit of the solutions and their performance is analyzed, including the impact of the parasitic part of the transient and the limits of work. Entire article beginning on and switching of MOSFET technology overview, followed by a short discussion and then to the analysis of complex issues. Carefully describes the design process on the ground and the high-side gate drive circuit, AC-coupled and transformer-isolated solutions. One of the chapters devoted to solve the synchronous rectifier applications, the MOSFET gate drive requirements. (2011-11-18, WORD, 482KB, 下载19次)
实验二 移位运算实验
一、实验目的：
掌握移位控制的功能及工作原理
二、预习要求：
1.了解8位双向移位寄存器74299的功能、引出端功能符号和管脚分配
2.预习移位运算电路的工作原理。
Experiment 1 Experiment 2 shift operation, experimental purposes: to master shift control function and working principle of two words, text: 1. About 74 299 8-bit bi-directional shift register function, function symbols and pin terminal distribution 2. Preview shift operation principle of the circuit. (2010-06-30, WORD, 34KB, 下载2次)
该系统主要运用人体传感器（热释红外和微波传感双鉴器）进行报警信号的采集，由单片机系统接收接警信号以及对信号进行处理，并由双音多频模块和语音模块通过电话线路即时拨号报警；在报警同时，通知摄像监控系统对对应报警点进行图像的采集和存储
This article is designed with image processing and automatic dialing features intelligent unmanned monitoring anti-theft alarm system hardware. The system using the human body sensor (pyroelectric infrared and microwave sensors Shuangjian device) for alarm signal acquisition, Alarm signal received by the MCU system and the signals are processed by the DTMF module and the phone line real-time voice module Dial-up alarm in alarm at the same time, inform the camera monitoring system alarm points on the corresponding image acquisition and storage. The system has very high practical value, suitable for wider use. (2010-05-20, WORD, 183KB, 下载36次)
单片机做数字时钟
单片计算机即单片微型计算机。（Single-Chip Microcomputer ）,是 集CPU ,RAM ,ROM ,
定时，计数和多种接口于一体的微控制器。他体积小，成本低，功能强，广泛应用于智能产
品和工业自动化上。而51 单片机是各单片机中最为典型和最有代表性的一种。
Digital Clock (2010-01-07, WORD, 119KB, 下载6次)
设计以电磁继电器模拟密码锁，由单片机8051来控制锁的打开与闭合，由HD7279来管理器键盘及显示，密码从键盘输入，用8051来控制7279显示当前锁的状态信息及报警。本次设计用单片机开发系统来模拟密码锁的多种功能，密码由4-6位数字组成，当输入密码相符时开锁，输入三次不符报警，同时密码输入正确时可以修改密码，此时指示灯亮。开锁单片机开发出开关量，通过光电耦合器控制，打开密码锁。报警则由单片机发出报警信号，控制音频放大电路发出报警声音。
Designed to simulate electromagnetic relay locks, by the microcontroller 8051 to control the lock open and closed, by the HD7279 to manage the keyboard and display device, the password from the keyboard input to control the 7279 with 8051 shows the current lock status information and alarms. The microcontroller development system designed for use to simulate the lock of a variety of functions, the password from 4-6 digits, when the lock when the password match, enter the three inconsistent with the police, at the same time when you enter the correct password can modify the password, this time indicator light . SCM developed unlocking switch volume control through the optocoupler, open the lock. Alarm alarm signal sent by the MCU to control the audio amplifier circuit alarm sounds. (2009-11-27, WORD, 293KB, 下载8次)
触摸屏学习及触控程序开发,将介绍如何编写软件驱动程序，从而能够使用这些微处理器配置、校准触摸屏以及对触摸屏输入持续响应。
Touch touch-screen learning and program development, will describe how to write software drivers to be able to use these microprocessors to configure, calibrate touch screen as well as continuing to respond to touch screen input. (2009-11-10, WORD, 54KB, 下载39次)
电路与程序分析:我们选用的是MCS51系列单片机74LS273 D锁存器 74LS32 或门电路 ，单片机做主控, 因为单片机的端口有限所以用74LS273做锁存 74LS32做脉冲分配
Circuit and program analysis: Our choices are the MCS51 series microcontrollers 74LS273 D latch 74LS32 OR gate circuit, the controlling microcomputer, because the port is limited microcontroller to do so with the 74LS273 latch 74LS32 do pulse distribution (2009-09-27, WORD, 243KB, 下载5次)
at24c01和02是串行存储器的经典，学会并应用它对与工业或者学习都有极大的帮助。因此我在此上传它的原理图及其程序。
at24c01 and 02 is a classic serial memory, learn and apply it to industrial or study has a great help. Therefore, I would upload its schematic diagram and its procedures. (2009-09-13, WORD, 389KB, 下载10次)
电子技术综合设计实验报告
采用555定时器，由555产生方波信号，方波经RC积分电路积分后即可得到三角波，再由三角波通过RC积分电路得到正弦波，该方案集成度高，同时产生正弦波的方法简单、易调。但实际遇到种种困难不能在短时间内解决，所以又设计了用运放电路产生正弦波的电路，并验证了其正确性。
General design of electronic technology experiment using 555 timer report, produced by the 555 square-wave signal, square wave by the RC integral circuit points can be obtained after the triangular wave, and then by the triangle wave through the RC integral circuit to be sinusoidal, the program integrated high, at the same time generate sine-wave method is simple and easy to tune. However, the actual difficulties should not resolved within a short time so designed operational amplifier circuits with sine wave generated circuit and verify its correctness. (2009-03-16, WORD, 150KB, 下载15次)
数字直流稳压器：
用单片机来设置输出电压，把单片机设置的数值通过D\A数模转换变换为模拟电压，然后通过输出的模拟电压，控制稳压模块的输出，稳压模块由可调稳压块LM317和双运算放大器LM358构成，通过LM358比较输出和设置电压并控制LM317的输出，以达到比较精确的输出，用三位数码管动态显示输出电压值，精确到0.1V。
Digital DC Regulators: MCU to set the output voltage, the single-chip set of values through the digital-analog converter DA transform analog voltage, and then through the analog output voltage, the control module s output voltage regulator, voltage regulator modules from LM317 adjustable regulator block and dual op-amp LM358 constitute, by comparison LM358 voltage output and set up and control the output of LM317, so as to achieve more precise output, with the three digital tube dynamic display the output voltage value, accurate to 0.1V. (2008-01-03, WORD, 5KB, 下载41次)
（1）改变拨码开关，能输出8种不同频率的方波信号，各信号占空比不同。
（2）调节电位器可以精密调节输出信号的频率
(1) To change the allocation of code switching, can output eight different frequency square-wave signal, the signal duty cycle different. (2) regulating the potential for precision can adjust the output signal frequency (2007-05-31, WORD, 458KB, 下载8次)
为了实现IC卡门禁考勤系统中RS232-USB的接口转换，需要1台支持USB的主机，同时还要提供主机上用于与外设通信的驱动，一般由操作系统提供。此外，还需开发在主机上执行的客户端应用程序。在设备端，需要提供具有USB接口的主控制器芯片，以及编写主控制器上执行的USB通信代码和用于执行外设功能的相关代码。
disucssed IC card system RS232-USB interface conversion, Taiwan needs a USB host support, but also to provide mainframe and peripherals used for communication-driven, generally operating systems. In addition, the hosts also need to be developed to implement the client application. The equipment side, the need to provide USB interface with the host controller chip and the preparation of master controller on the implementation of the code and USB peripheral functions for the implementation of the relevant code. (2007-05-07, WORD, 9KB, 下载95次)
ARM学习资料，包括ARM7在嵌入式应用中启动程序的实现，ARM处理器与单片机性能价格比，ARM开发调试教程，ARM系统结构介绍等等不一一列举
ARM learning materials, including ARM7 Embedded Application commencement of proceedings to achieve, ARM processor and functional MCU ARM Development and Debugging Guide, ARM architecture introduced not enumerated, etc. (2007-03-09, WORD, 893KB, 下载15次)
飞行控制系统方案。整个系统由传感器组、飞控计算机、任务管理计算机、舵机、表决电路等主要部件和电源、外总线、通信设备、地面站等辅助设备组成。无人机、起落架、发动机、任务设备、燃油系统、环控系统等是被监控对象。其中，关键传感器采用相似或者非相似三余度；飞控计算机采用“主备备”式三余度飞控机算机；舵机采用二余度电动舵机；表决逻辑由高可靠性单余度数字逻辑电路和双路开关实现。
Flight Control System program. The entire system is composed of sensors, the flight control computer, task management computer, steering gear, the division circuit components and the main power source, Foreign bus, communications equipment, ground support equipment components. UAV, landing gear, engine, mission equipment, fuel systems, environmental control systems are monitoring targets. Among them, critical sensor similar to three or similar non- I; The flight control computer "equitable preparations," I was three-flight control machine; Rudder I was using two electric steering; vote by the logic of high-reliability and redundancy digital logic circuit and a two-way switch. (2006-11-12, WORD, 566KB, 下载636次)