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answering

  • Creating the Auto answering Machine Application

    Creating the Auto answering Machine Application

    標(biāo)簽: Application answering Creating Machine

    上傳時(shí)間: 2013-12-06

    上傳用戶:chenbhdt

  • VC寫的用TAPI實(shí)現(xiàn)的自動(dòng)應(yīng)答系統(tǒng)(answering Machine).

    VC寫的用TAPI實(shí)現(xiàn)的自動(dòng)應(yīng)答系統(tǒng)(answering Machine).

    標(biāo)簽: answering Machine TAPI 自動(dòng)應(yīng)答

    上傳時(shí)間: 2013-12-29

    上傳用戶:kernaling

  • Sample C source code for USD $10 Linux answering machine.

    Sample C source code for USD $10 Linux answering machine.

    標(biāo)簽: answering machine Sample source

    上傳時(shí)間: 2016-10-04

    上傳用戶:shinesyh

  • answering Queries using views is an article that contains an introduction to the theory and some alg

    answering Queries using views is an article that contains an introduction to the theory and some algorithms, examples for the queries that uses views to resolve some problems. Also this article have a large references for more information about this subject.

    標(biāo)簽: introduction answering contains Queries

    上傳時(shí)間: 2017-03-18

    上傳用戶:wangyi39

  • MT8870D DTMF解碼芯片

    Features• Complete DTMF Receiver• Low power consumption• Internal gain setting amplifier• Adjustable guard time• Central office quality• Power-down mode• Inhibit mode• Backward compatible withMT8870C/MT8870C-1Applications• Receiver system for British Telecom (BT) orCEPT Spec (MT8870D-1)• Paging systems• Repeater systems/mobile radio• Credit card systems• Remote control• Personal computers• Telephone answering machine

    標(biāo)簽: 8870D 8870 DTMF MT

    上傳時(shí)間: 2013-11-20

    上傳用戶:mpquest

  • 嵌入式LINUX 電子教程全集

    嵌入式LINUX  電子教程全集 嵌入式系統(tǒng)出現(xiàn)于60年代晚期,它最初被用于控制機(jī)電電話交換機(jī),如今已被廣泛的應(yīng)用于工業(yè)制造、過(guò)程控制、通訊、儀器、儀表、汽車、船舶、航空、航天、軍事裝備、消費(fèi)類產(chǎn)品等眾多領(lǐng)域。計(jì)算機(jī)系統(tǒng)核心CPU,每年在全球范圍內(nèi)的產(chǎn)量大概在二十億顆左右,其中超過(guò)80%應(yīng)用于各類專用性很強(qiáng)的嵌入式系統(tǒng)。一般的說(shuō),凡是帶有微處理器的專用軟硬件系統(tǒng)都可以稱為嵌入式系統(tǒng)。   1. 嵌入式Linux系統(tǒng)就是利用Linux其自身的許多特點(diǎn),把它應(yīng)用到嵌入式系統(tǒng)里。   Linux做嵌入式的優(yōu)勢(shì),首先,Linux是開放源代碼的,不存在黑箱技術(shù),遍布全球的眾多Linux愛(ài)好者又是Linux開發(fā)者的強(qiáng)大技術(shù)支持;其次,Linux的內(nèi)核小、效率高,內(nèi)核的更新速度很快,linux是可以定制的,其系統(tǒng)內(nèi)核最小只有約134KB。第三,Linux是免費(fèi)的OS,在價(jià)格上極具競(jìng)爭(zhēng)力。 Linux還有著嵌入式操作系統(tǒng)所需要的很多特色,突出的就是Linux適應(yīng)于多種CPU和多種硬件平臺(tái),是一個(gè)跨平臺(tái)的系統(tǒng)。到目前為止,它可以支持二三十種CPU。而且性能穩(wěn)定,裁剪性很好,開發(fā)和使用都很容易。很多CPU包括家電業(yè)芯片,都開始做Linux的平臺(tái)移植工作。移植的速度遠(yuǎn)遠(yuǎn)超過(guò)Java的開發(fā)環(huán)境。也就是說(shuō),如果今天用Linux環(huán)境開發(fā)產(chǎn)品,那么將來(lái)?yè)QCPU就不會(huì)遇到困擾。同時(shí),Linux內(nèi)核的結(jié)構(gòu)在網(wǎng)絡(luò)方面是非常完整的,Linux對(duì)網(wǎng)絡(luò)中最常用的TCP/IP協(xié)議有最完備的支持。提供了包括十兆、百兆、千兆的以太網(wǎng)絡(luò),以及無(wú)線網(wǎng)絡(luò),Toker ring(令牌環(huán)網(wǎng))、光纖甚至衛(wèi)星的支持。所以Linux很適于做信息家電的開發(fā)。   還有使用Linux為的是來(lái)開發(fā)無(wú)線連接產(chǎn)品的開發(fā)者越來(lái)越多。Linux在快速增長(zhǎng)的無(wú)線連接應(yīng)用主場(chǎng)中有一個(gè)非常重要的優(yōu)勢(shì),就是有足夠快的開發(fā)速度。這是因?yàn)長(zhǎng)Inux有很多工具,并且Linux為眾多程序員所熟悉。因此,我們要在嵌入式系統(tǒng)中使用Linux操作系統(tǒng)。   Linux的大小適合嵌入式操作系統(tǒng)——Linux固有的模塊性,適應(yīng)性和可配置性,使得這很容易做到。另外,Linux源碼的實(shí)用性和成千上萬(wàn)的程序員熱切其望它用于無(wú)數(shù)的嵌入式應(yīng)用軟件中,導(dǎo)致很多嵌入式Linux的出現(xiàn),包括:Embedix,ETLinux,LEM,Linux Router Project,LOAF,uCLinux,muLinux,ThinLinux,F(xiàn)irePlug,Linux和PizzaBox Linux   相對(duì),Linux的圖形界面還相對(duì)較弱,但近年Linux的圖形界面發(fā)展也很快,這也就不是問(wèn)題。   2. 什么是嵌入式Linux   嵌入式linux 是將日益流行的Linux操作系統(tǒng)進(jìn)行裁剪修改,使之能在嵌入式計(jì)算機(jī)系統(tǒng)上運(yùn)行的一種操作系統(tǒng)。嵌入式linux既繼承了Interlnet上無(wú)限的開放源代碼資源,又具有嵌入式操作系統(tǒng)的特性。嵌入式Linux的特點(diǎn)是版權(quán)費(fèi)免費(fèi);購(gòu)買費(fèi)用媒介成本技術(shù)支持全世界的自由軟件開發(fā)者提供支持網(wǎng)絡(luò)特性免費(fèi),而且性能優(yōu)異,軟件移植容易,代碼開放,有許多應(yīng)用軟件支持,應(yīng)用產(chǎn)品開發(fā)周期短,新產(chǎn)品上市迅速,因?yàn)橛性S多公開的代碼可以參考和移植,實(shí)時(shí)性能RT_Linux Hardhat Linux 等嵌入式Linux支持,實(shí)時(shí)性能穩(wěn)定性好安全性好。   3. 嵌入式Linux有巨大的市場(chǎng)前景和商業(yè)機(jī)會(huì),出現(xiàn)了大量的專業(yè)公司和產(chǎn)品,如Montavista Lineo Emi等,有行業(yè)協(xié)會(huì)如Embedded Linux Consortum等,得到世界著名計(jì)算機(jī)公司和OEM板級(jí)廠商的支持,例如IBM Motorola Intel等。傳統(tǒng)的嵌入式系統(tǒng)廠商也采用了Linux策略,如Lynxworks Windriver QNX等,還有Internet上的大量嵌入式Linux愛(ài)好者的支持。嵌入式Linux支持幾乎所有的嵌入式CPU和被移植到幾乎所有的嵌入式OEM板。   4.嵌入式Linux的應(yīng)用領(lǐng)域非常廣泛,主要的應(yīng)用領(lǐng)域有信息家電、PDA 、機(jī)頂盒、Digital Telephone、answering Machine、Screen Phone 、數(shù)據(jù)網(wǎng)絡(luò)、Ethernet Switches、Router、Bridge、Hub、Remote access servers、ATM、Frame relay 、遠(yuǎn)程通信、醫(yī)療電子、交通運(yùn)輸計(jì)算機(jī)外設(shè)、工業(yè)控制、航空航天領(lǐng)域等。   5.如果分別讓10位工程師給出嵌入式系統(tǒng)的定義,將得到10個(gè)不同的答案。一般來(lái)說(shuō),大部分的嵌入式系統(tǒng)執(zhí)行特定的任務(wù)。我們假定最簡(jiǎn)單的嵌入式系統(tǒng)包括輸入/輸出功能,以及一些控制邏輯,該系統(tǒng)基于它的配置執(zhí)行某些類型的功能。按照這個(gè)標(biāo)準(zhǔn),可以認(rèn)為一個(gè)包含實(shí)現(xiàn)控制邏輯74123計(jì)數(shù)器以及一個(gè)狀態(tài)是一個(gè)嵌入式系統(tǒng)。也許可以補(bǔ)充說(shuō),該系統(tǒng)必須可通過(guò)存儲(chǔ)在固件中的軟件進(jìn)行編程。這個(gè)新的嵌入式系統(tǒng)定義包括輸入/輸出(I/O),以及存儲(chǔ)在系統(tǒng)固件中的控制邏輯。一個(gè)帶有鼠標(biāo)、鍵盤、網(wǎng)絡(luò)連接并運(yùn)行圖形用戶界面(GUI,graphical user interface)多任務(wù)操作系統(tǒng)的桌面計(jì)算機(jī)顯然滿足這些要求,但我們能認(rèn)為它是一個(gè)嵌入式系統(tǒng)嗎?   如果桌面計(jì)算機(jī)不是一個(gè)嵌入式系統(tǒng),那么手持設(shè)備呢?它們有I/O功能,可以運(yùn)行存儲(chǔ)在固件中的控制邏輯。有人說(shuō),桌面計(jì)算機(jī)和手持設(shè)備都有通用計(jì)算機(jī)設(shè)備,可以運(yùn)行軟件來(lái)執(zhí)行許多不同的任務(wù),與之不同的是,嵌入式系統(tǒng)(例如,洗碗機(jī)控制器或飛行導(dǎo)航系統(tǒng))主要是為特定任務(wù)而設(shè)計(jì)的。這種特定的功能限定使嵌入式設(shè)備有功能上的唯一性。如果是這樣,為什么一些嵌入式系統(tǒng)設(shè)計(jì)成具有附加的功能,如存儲(chǔ)在非易失性存儲(chǔ)器中的程序,并且具有運(yùn)行可以完成原始設(shè)計(jì)范圍之外的任務(wù)的多任務(wù)操作系統(tǒng)的能力呢?   在過(guò)去,區(qū)分嵌入式系統(tǒng)和通用計(jì)算機(jī)比現(xiàn)在簡(jiǎn)單的多。例如,可以很容易地區(qū)分出一個(gè)基于8051的T1分幅卡嵌入式系統(tǒng)和一臺(tái)Sun UNIX工作站。而現(xiàn)在,從功能方面很難區(qū)分一臺(tái)Sun工作站和一個(gè)包含PowerPC以及32MB內(nèi)存和16MB閃存的機(jī)頂盒。這樣的機(jī)頂盒可以運(yùn)行帶GUI的多任務(wù)操作系統(tǒng),可現(xiàn)場(chǎng)升級(jí),可以同時(shí)運(yùn)行多個(gè)程序(如視頻控制器、數(shù)字錄像和Java虛擬機(jī)),還可以進(jìn)行安全的因特網(wǎng)在線交易。很難判斷這種機(jī)頂盒是否是一個(gè)嵌入式系統(tǒng)。顯然,硬件性能的提升和價(jià)格的下降使通用計(jì)算機(jī)和嵌入式系統(tǒng)之間的界限變得很模糊,技術(shù)的進(jìn)步使得我們很難定義什么是嵌入式。

    標(biāo)簽: LINUX 嵌入式 電子教程

    上傳時(shí)間: 2014-12-30

    上傳用戶:ljt101007

  • This book is for you if You re no "dummy," and you need to get quickly up to speed in intermediate

    This book is for you if You re no "dummy," and you need to get quickly up to speed in intermediate to advanced C++ You ve had some experience in C++ programming, but reading intermediate and advanced C++ books is slow-going You ve had an introductory C++ course, but you ve found that you still can t follow your colleagues when they re describing their C++ designs and code You re an experienced C or Java programmer, but you don t yet have the experience to develop nuanced C++ code and designs You re a C++ expert, and you re looking for an alternative to answering the same questions from your less-experienced colleagues over and over again C++ Common Knowledge covers essential but commonly misunderstood topics in C++ programming and design while filtering out needless complexity in the discussion of each topic. What remains is a clear distillation of the essentials required for production C++ programming, presented in the author s trademark incisive, engaging style.

    標(biāo)簽: intermediate you quickly dummy

    上傳時(shí)間: 2014-01-09

    上傳用戶:wpwpwlxwlx

  • DAKOTA

    Computational models are commonly used in engineering design and scientific discovery activities for simulating complex physical systems in disciplines such as fluid mechanics, structural dynamics, heat transfer, nonlinear structural mechanics, shock physics, and many others. These simulators can be an enormous aid to engineers who want to develop an understanding and/or predictive capability for complex behaviors typically observed in the corresponding physical systems. Simulators often serve as virtual prototypes, where a set of predefined system parameters, such as size or location dimensions and material properties, are adjusted to improve the performance of a system, as defined by one or more system performance objectives. Such optimization or tuning of the virtual prototype requires executing the simulator, evaluating performance objective(s), and adjusting the system parameters in an iterative, automated, and directed way. System performance objectives can be formulated, for example, to minimize weight, cost, or defects; to limit a critical temperature, stress, or vibration response; or to maximize performance, reliability, throughput, agility, or design robustness. In addition, one would often like to design computer experiments, run parameter studies, or perform uncertainty quantification (UQ). These approaches reveal how system performance changes as a design or uncertain input variable changes. Sampling methods are often used in uncertainty quantification to calculate a distribution on system performance measures, and to understand which uncertain inputs contribute most to the variance of the outputs. A primary goal for Dakota development is to provide engineers and other disciplinary scientists with a systematic and rapid means to obtain improved or optimal designs or understand sensitivity or uncertainty using simulationbased models. These capabilities generally lead to improved designs and system performance in earlier design stages, alleviating dependence on physical prototypes and testing, shortening design cycles, and reducing product development costs. In addition to providing this practical environment for answering system performance questions, the Dakota toolkit provides an extensible platform for the research and rapid prototyping of customized methods and meta-algorithms

    標(biāo)簽: Optimization and Uncertainty Quantification

    上傳時(shí)間: 2016-04-08

    上傳用戶:huhu123456

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