The SDI standards are the predominant standards for uncompressed digital videointerfaces in the broadcast studio and video production center. The first SDI standard,SD-SDI, allowed standard-definition digital video to be transported over the coaxial cableinfrastructure initially installed in studios to carry analog video. Next, HD-SDI wasto support high-definition video. Finally, dual link HD-SDI and 3G-SDIdoubled the bandwidth of HD-SDI to support 1080p (50 Hz and 60 Hz) and other videoformats requiring more bandwidth than HD-SDI provides.
上傳時間： 2013-10-08
上傳用戶：yjj631
The field of microelectromechanical systems (MEMS), particularly micromachinedmechanical transducers, has been expanding over recent years, and the productioncosts of these devices continue to fall. Using materials, fabrication processes, anddesign tools originally developed for the microelectronic circuits industry, newtypes of microengineered device are evolving all the time—many offering numerousadvantages over their traditional counterparts. The electrical properties of siliconhave been well understood for many years, but it is the mechanical properties thathave been exploited in many examples of MEMS. This book may seem slightlyunusual in that it has four editors. However, since we all work together in this fieldwithin the School of Electronics and Computer Science at the University of Southampton,it seemed natural to work together on a project like this. MEMS are nowappearing as part of the syllabus for both undergraduate and postgraduate coursesat many universities, and we hope that this book will complement the teaching thatis taking place in this area.
上傳時間： 2013-10-16
上傳用戶：朗朗乾坤
ZigBee技術是一種應用于短距離范圍內，低傳輸數據速率下的各種電子設備之間的無線通信技術。ZigBee名字來源于蜂群使用的賴以生存和發展的通信方式，蜜蜂通過跳ZigZag形狀的舞蹈來通知發現的新食物源的位置、距離和方向等信息，以此作為新一代無線通訊技術的名稱。ZigBee過去又稱為“HomeRF Lite”、“RF-EasyLink”或“FireFly”無線電技術，目前統一稱為ZigBee技術。 2、ZigBee技術的特點 自從馬可尼發明無線電以來，無線通信技術一直向著不斷提高數據速率和傳輸距離的方向發展。例如：廣域網范圍內的第三代移動通信網絡（3G）目的在于提供多媒體無線服務，局域網范圍內的標準從IEEE802.11的1Mbit/s到IEEE802.11g的54Mbit/s的數據速率。而當前得到廣泛研究的ZigBee技術則致力于提供一種廉價的固定、便攜或者移動設備使用的極低復雜度、成本和功耗的低速率無線通信技術。這種無線通信技術具有如下特點： 功耗低：工作模式情況下，ZigBee技術傳輸速率低，傳輸數據量很小，因此信號的收發時間很短，其次在非工作模式時，ZigBee節點處于休眠模式。設備搜索時延一般為30ms，休眠激活時延為15ms，活動設備信道接入時延為15ms。由于工作時間較短、收發信息功耗較低且采用了休眠模式，使得ZigBee節點非常省電，ZigBee節點的電池工作時間可以長達6個月到2年左右。同時，由于電池時間取決于很多因素，例如：電池種類、容量和應用場合，ZigBee技術在協議上對電池使用也作了優化。對于典型應用，堿性電池可以使用數年，對于某些工作時間和總時間（工作時間+休眠時間）之比小于1%的情況，電池的壽命甚至可以超過10年。 數據傳輸可靠：ZigBee的媒體接入控制層（MAC層）采用talk-when-ready的碰撞避免機制。在這種完全確認的數據傳輸機制下，當有數據傳送需求時則立刻傳送，發送的每個數據包都必須等待接收方的確認信息，并進行確認信息回復，若沒有得到確認信息的回復就表示發生了碰撞，將再傳一次，采用這種方法可以提高系統信息傳輸的可靠性。同時為需要固定帶寬的通信業務預留了專用時隙，避免了發送數據時的競爭和沖突。同時ZigBee針對時延敏感的應用做了優化，通信時延和休眠狀態激活的時延都非常短。 網絡容量大：ZigBee低速率、低功耗和短距離傳輸的特點使它非常適宜支持簡單器件。ZigBee定義了兩種器件：全功能器件（FFD）和簡化功能器件（RFD）。對全功能器件，要求它支持所有的49個基本參數。而對簡化功能器件，在最小配置時只要求它支持38個基本參數。一個全功能器件可以與簡化功能器件和其他全功能器件通話，可以按3種方式工作，分別為：個域網協調器、協調器或器件。而簡化功能器件只能與全功能器件通話，僅用于非常簡單的應用。一個ZigBee的網絡最多包括有255個ZigBee網路節點，其中一個是主控（Master）設備，其余則是從屬（Slave）設備。若是通過網絡協調器（Network Coordinator），整個網絡最多可以支持超過64000個ZigBee網路節點，再加上各個Network Coordinator可互相連接，整個ZigBee網絡節點的數目將十分可觀。 兼容性：ZigBee技術與現有的控制網絡標準無縫集成。通過網絡協調器（Coordinator）自動建立網絡，采用載波偵聽/沖突檢測（CSMA-CA）方式進行信道接入。為了可靠傳遞，還提供全握手協議。
標簽： zigbee
上傳時間： 2013-11-24
上傳用戶：siguazgb
The SDI standards are the predominant standards for uncompressed digital videointerfaces in the broadcast studio and video production center. The first SDI standard,SD-SDI, allowed standard-definition digital video to be transported over the coaxial cableinfrastructure initially installed in studios to carry analog video. Next, HD-SDI wasto support high-definition video. Finally, dual link HD-SDI and 3G-SDIdoubled the bandwidth of HD-SDI to support 1080p (50 Hz and 60 Hz) and other videoformats requiring more bandwidth than HD-SDI provides.
上傳時間： 2013-12-08
上傳用戶：liansi
This document was developed under the Standard Hardware and Reliability Program (SHARP) TechnologyIndependent Representation of Electronic Products (TIREP) project. It is intended for use by VHSIC HardwareDescription Language (VHDL) design engineers and is offered as guidance for the development of VHDL modelswhich are compliant with the VHDL Data Item Description (DID DI-EGDS-80811) and which can be providedto manufacturing engineering personnel for the development of production data and the subsequent productionof hardware. Most VHDL modeling performed to date has been concentrated at either the component level orat the conceptual system level. The assembly and sub-assembly levels have been largely disregarded. Under theSHARP TIREP project, an attempt has been made to help close this gap. The TIREP models are based upon lowcomplexity Standard Electronic Modules (SEM) of the format A configuration. Although these modules are quitesimple, it is felt that the lessons learned offer guidance which can readily be applied to a wide range of assemblytypes and complexities.
上傳時間： 2013-11-20
上傳用戶：pzw421125
TheTool is highy customizable map editor(based on QT) which can be extended via LUA scripts. A first implentation is ready and can be published to the public. The editor is the perfect tool who wants to design some 3d games but don t have time to write
標簽： customizable extended TheTool scripts
上傳時間： 2013-12-12
上傳用戶：lanwei
Setting up an ADOCE project using Visual C++ 6.0 is rather simple. Assuming that you have downloaded and installed the ADOCE SDK from Microsoft, you are ready to use it in your Windows CE Database applications. The sample that I have provided is a *very* simple one illustrating how to instantiate the proper COM objects, and the basics of how to interface with them (in a very simple example)
標簽： downloaded Assuming Setting project
上傳時間： 2015-01-16
上傳用戶：陽光少年2016
項目描述: slsnif is a serial port logging utility. It listens to the specified serial port and logs all data going through this port in both directions. Serial line sniffer是一個串行端口記錄工具。它監聽指定的串行端口并記錄所有通過這個端口的兩個方向的數據。 來源：http://freshmeat.net slsnif是一個串行端口日志工具。它監聽特殊的串口，記錄所有通過這具串口的兩個方向的數據。 類別: Development Status: 5 - Production/StableEnvironment: Console (Text Based)Intended Audience: DevelopersLicense: GNU General Public License (GPL)Operating System: LinuxProgramming Language: CTopic: Communications, Debuggers
標簽： serial port specified logging
上傳時間： 2014-01-17
上傳用戶：許小華
項目描述: slsnif is a serial port logging utility. It listens to the specified serial port and logs all data going through this port in both directions. Serial line sniffer是一個串行端口記錄工具。它監聽指定的串行端口并記錄所有通過這個端口的兩個方向的數據。 來源：http://freshmeat.net slsnif是一個串行端口日志工具。它監聽特殊的串口，記錄所有通過這具串口的兩個方向的數據。 類別: Development Status: 5 - Production/StableEnvironment: Console (Text Based)Intended Audience: DevelopersLicense: GNU General Public License (GPL)Operating System: LinuxProgramming Language: CTopic: Communications, Debuggers
標簽： serial port specified logging
上傳時間： 2013-12-12
上傳用戶：silenthink
項目描述: Env_audit is a program that ferrets out everything it can about the environment. It looks for process IDs, UID, GID, signal masks, umask, priority, file descriptors, and environmental variables. It comes with test configurations for anacron, apache, atd, crond, GDB, inittab, logrotate, PHP, pppd, procmail, rsh, rxvt, sendmail, SSH, stunnel, sudo, xinetd, and xterm. env_audit是一個搜索有關環境的所有東西的程序。它查詢進程IDs，UID, GID,信號掩碼，umask,優先權，文件描述符，和環境變量。它提供了用于anacron, apache, atd, crond, GDB, inittab, logrotate, PHP, pppd, procmail, rsh, rxvt, sendmail, SSH, stunnel, sudo, xinetd, 和xterm的測試配置。 類別: Development Status: 5 - Production/Stable Environment: Console (Text Based) Intended Audience: System Administrators License: GNU General Public License (GPL) Operating System: POSIX Topic: Security
標簽： environment everything Env_audit ferrets
上傳時間： 2013-12-02
上傳用戶：qweqweqwe
