畢業(yè)設(shè)計(jì)通信專業(yè)相關(guān)文獻(xiàn)翻譯

1、原文：system design for a mini-type remote maintaining terminal device based on a telephone networkabstractthe remote maintaining and diagnosis technology is very important for the distributed and distant on-the-spot equipments and devices for monitoring，predicting，and diagnosing failurethis paper pres

2、ents a new kind of mini-type remote maintaining terminal devices based on a telephone networkthe system design and implementation is described in detail in the paperthe device is composed of a integrated circuit，telephone dial unit，modulation unit，central processing unit，button input unit and displa

3、y unitthe mini-type remote maintaining terminal device communicates and exchanges information with the distributed and distant on-the-spot equipments and devices for monitoring, predicting, and diagnosing failurethe data is transmitted through the public switched telephone network (pstn)it can commu

4、nicate with remote equipments, gather the various parameter data of the devices such as power, power factor, and frequency from the remote industrial equipmentsit can also be used to control the remote devicesin the paper, the hardware and circuit design is described in detailthe device is practical

5、ly very important for monitoring，predicting，and diagnosing failure with a low total costkeywords：remote data exchange device, pstn, circuit design, dce1introductioninformation communication with remote computers or equipment is of great importance in numerous industrial applications and public data

6、servicesmany kinds of communication and data-transmitting systems have used data communication equipment (dce)to exchange informationthe special-purpose data communication equipment(dce)has a important practical role in those systems, because they are cheaper and more convenient than the systems bui

7、lt up by the computer network to form a distributed environmentthe dce call often satisfy the required special-purpose communication system in many special fieldsa number of experiments and researches have been done regarding the remote data exchange devices in recent yearsmany investigators have ex

8、plored the special devices that exchange data through public switched telephone networkreddy reported a device that could transmit data over telephone networkshe proposed the basic principles of data transmission over the public switched telephone network (pstn)hong sun investigated a kind of hust-b

9、 remote terminal devices, which consisted of computers and measurement devicesit could communicate with remote equipment；gather the parameter data of power, power factor, and frequency from the remote industrial equipmentit could also be used to control the remote devicesshuping mao designed a real-

10、time remote data gathering device based on a neuron chip and network technologieszhiwei jia reported a device that utilized pc isa slotsit realized data exchange between a power system and the remote terminalmachineshui huang suggested a system structure of an internet based radiotherapy diagnose sy

11、stem with some kind of remote devicesalthough many researchers have investigated the remote data exchange system with the special-purpose remote terminal devices，little work has been published on the system and circuit design of the data exchange devices that can transmit the data based on public sw

12、itched telephone networkin this paper, we investigated a mini-type remote data exchange device that can be used to exchange the data with the remote host computer through pstnthe system principle and the circuit design of the device have been studied in detailthe results of this study may help the d

13、esign of the pstn based data exchange devices and the system construction of the general used special purposed communicationnetwork2the principle of mini-type remote data exchange devicemini-type remote data exchange devices are considered in a non-industrial fieldthe public has a great demand to ex

14、change data and information with a remote computer and database in daily lifesuch device should satisfy following requirements：1) the data is transmitted through pstn2) the expenses age relative low3)it requires relatively a small size and easy to carry with4)it can be easily operated and managed wi

15、thout certain trainingthe mini-type remote data exchange device is used to exchange data with remote host computers database when data users are dispersed in different geographical positionsusers can set up a connection remote host computer with a mini-type remote data exchange devicethe device can

16、be used at places such as home or a hotel or at any place where pstn exists，to connect the host computers for exchanging through a telephone lineit would improve working efficiency and reduce expensesbecause digital signals are unsuitable to be transmitted in the paired-line of a public switched tel

17、ephone network, communication between a user and server must be done by using a modem device to modulate the digital signalitu-t has made standards of many kinds of modemsv .34 standards support the speed as 28kpbsthe upgraded edition v.34 v.34 annexes 1201h supports the speeds of 33.6kbps, by using

18、 data compression(v.42bis)，the supreme speed can reach 133.8kbpsa new standard is v.90 which can transfer data at 56kbps and a higher rate through data compressionthe mini-type remote data exchange device is used in small and simple terminals that can communicate with the remote host computerone dat

19、um server on the host computer and many mini-type remote data exchange devices build up a small-scale communication network and data exchange application systemthe database is in the host computerthe host computer also can communicate with other computers over an internet or intranetthe mini-type re

20、mote data exchange devices is used to exchange the data with the host computer through the public switched telephone networksfigure l show the system infrastructurefigure 1: a small-scale communication network and data exchange application system figure 2：the mini-type remote data exchange devicethe

21、 mini-type remote data exchange device consists of a number of integrated circuits such as a telephone dial device，modulate integrated circuit, central processing unit, button input device and display devicethe device has many advantages such as small，easy to carry, relatively cheap, easy to operate

22、 andlow data transmission costfigure 2 shows the appearance of the device3circuit design of mini-type remote data exchange device3.1 the device infrastructure1)central processing unit：namely cpuit is a single chip micyoco(scm), such as intel 51 scm seriesit is used to control all other components an

23、d to coordinate work of all devices2）telephone dial device：it is used to dial and produce dual-tone-multi-frequency (dtmf) signal or pulse signalit is used to choose the datum data exchange server at the remote host computer before setting up a connection with the host computerthis device can be an

24、independent integrated circuit or be included in the following modulation-demodulation device3)modulation-demodulation device：it is used to modulate the digital signals to audio carrier frequency signals for sending to the host computerat the same time it demodulates the audio carrier frequency sign

25、als received from the remote host computer through the public switched telephone networks to digital signalsthe demodulated digital signal will be processed by the central processing unit4)the button input device：it consists of a small-scale keyboard and several electronic elementsusers can use the

26、device to input data and operate the mini-type remote data exchange device5)display device：it is used to show the data in the display screenfigure 3: the block-diagram of the circuit3.2 the workflow of the deviceoperators use the button device to input numbers, the central processing unit processes

27、the input data and transmits to the remote host computer through the pstnthe display device shows the data the user inputted and the data received from the remote host computerusers operate the mini-type remote data exchange device by the input devicethe digital signals users inputted will be modera

28、ted by a modem and transmitted to the remote host computerthe audio carrier frequency signals received from the host computer will be demodulated by the modem and shown in the display devicethe remote host computer receives requests from the mini-type remote data exchange device and makes correspond

29、ing treatments with different application programs，and sends the results back to the mini-type remote data exchange device with the same modulation method through public switched telephone networksthis device uses the back-echo method to confine the data inputted by the userthe modulation demodulati

30、on devices receive the demodulation signal and demodulate to the digital signalthe central processing unit reads and deals with data and sends the data to the display device to show the results4conclusionsthis paper presents a new kind of mini-type remote maintain terminal devices based on a telepho

31、ne network it can be used to transmit data through public switched telephone networksit consists of a small number of integrated circuits, a telephone dial device, a modulation device, a central processing unit， a button input device and a display devicethe device can be used in many applications wi

32、th the advantagesof a small size，easy to carry, relatively cheap，and easy to operateit is suitable for constructing a mini scale communication network at a low cost for data transmission through the pstn and has extensive application prospectsfurther works should be performed to establish the genera

33、l mini scale communication network with the host computer and devices through the pstnalso, the communication between the devices should consider the essential function for exchanging information between the device usersfurther research could explore the possibility to design more functions of the d

34、ata exchange devicesthe pstn based mini type data exchange devices can be used in a wide application filed, such as the stock information querying, the public database and bank account queryingliterature source：college of information technology, zhejiang university of financeeconomics, china 譯文：一個(gè)基于

35、電話網(wǎng)絡(luò)的迷你型遠(yuǎn)程維護(hù)終端設(shè)備系統(tǒng)的設(shè)計(jì)摘要遠(yuǎn)程維護(hù)和診斷技術(shù)對(duì)遠(yuǎn)距離分布和現(xiàn)場(chǎng)設(shè)備的監(jiān)測(cè)、預(yù)測(cè)和故障診斷是非常重要的。本文提出了一種基于電話網(wǎng)絡(luò)的新的迷你型遠(yuǎn)程維護(hù)終端裝置。本文對(duì)該系統(tǒng)的設(shè)計(jì)和實(shí)施進(jìn)行了詳細(xì)的說明。 該裝置是由一個(gè)集成電路，電話撥號(hào)裝置，調(diào)制單元，中央處理單元，按鈕輸入單元和顯示單元組成。迷你型遠(yuǎn)程維護(hù)終端設(shè)備運(yùn)用通信和信息交換及分布式對(duì)遠(yuǎn)處的現(xiàn)場(chǎng)設(shè)備進(jìn)行設(shè)備的監(jiān)測(cè)，預(yù)測(cè)和故障診斷。數(shù)據(jù)通過公共交換電話網(wǎng)（pstn）傳輸。它可以與遠(yuǎn)程設(shè)備通信，如功率，功率因數(shù)，并從遠(yuǎn)程工業(yè)設(shè)備搜集各種頻率的器件參數(shù)數(shù)據(jù)。它也可以用來控制遠(yuǎn)程設(shè)備。在本文中，對(duì)硬件和電路設(shè)計(jì)進(jìn)行了詳細(xì)說明。

36、該設(shè)備實(shí)際上對(duì)故障的監(jiān)測(cè)，預(yù)測(cè)和診斷非常重要且總的成本低廉。關(guān)鍵詞：遠(yuǎn)程數(shù)據(jù)交換設(shè)備 ，公共交換電話網(wǎng)絡(luò)，電路設(shè)計(jì)，數(shù)據(jù)通信設(shè)備 1 引言遠(yuǎn)程計(jì)算機(jī)或設(shè)備的信息通信是對(duì)許多工業(yè)應(yīng)用和公共數(shù)據(jù)服務(wù)具有重要的意義。多種通訊和數(shù)據(jù)傳輸系統(tǒng)使用數(shù)據(jù)通信設(shè)備（dce）進(jìn)行信息交換。專用的數(shù)據(jù)通信設(shè)備（dce）在這些系統(tǒng)中有一個(gè)重要的實(shí)際作用，因?yàn)樗鼈儽仍谝粋€(gè)分布式環(huán)境中建立的計(jì)算機(jī)網(wǎng)絡(luò)系統(tǒng)更便宜，更方便。dce調(diào)用通常能在在許多特殊領(lǐng)域滿足專用通信系統(tǒng)的需要。在近幾年許多的實(shí)驗(yàn)和研究工作已經(jīng)完成關(guān)于遠(yuǎn)程數(shù)據(jù)交換設(shè)備。許多學(xué)者通過公共交換數(shù)據(jù)交換電話網(wǎng)絡(luò)探討了特殊裝置。雷迪報(bào)道了一種可以通過電話網(wǎng)絡(luò)傳輸?shù)?/p>

37、數(shù)據(jù)的裝置。他建議在公共交換電話網(wǎng)（pstn）的基礎(chǔ)上進(jìn)行數(shù)據(jù)傳輸。據(jù)孫宏報(bào)道，一種hust-b遠(yuǎn)程終端設(shè)備，其中包括計(jì)算機(jī)和測(cè)量設(shè)備。它可以與遠(yuǎn)程設(shè)備進(jìn)行通信，收集遠(yuǎn)程工業(yè)設(shè)備的功率，功率因數(shù)和頻率的數(shù)據(jù)參數(shù)。它也可以用來控制遠(yuǎn)程設(shè)備。毛淑萍設(shè)計(jì)了一個(gè)基于神經(jīng)元芯片和網(wǎng)絡(luò)技術(shù)的實(shí)時(shí)遠(yuǎn)程數(shù)據(jù)采集設(shè)備。賈志偉報(bào)道稱個(gè)人電腦設(shè)備可利用isa插槽。它實(shí)現(xiàn)了電力系統(tǒng)之間的數(shù)據(jù)和遠(yuǎn)程終端機(jī)器的交流。黃輝提出了一個(gè)基于互聯(lián)網(wǎng)的遠(yuǎn)程放射治療某些類型的設(shè)備診斷系統(tǒng)的體系結(jié)構(gòu)。雖然許多研究人員調(diào)查了遠(yuǎn)程數(shù)據(jù)與專用交換系統(tǒng)遠(yuǎn)程終端設(shè)備，些許功能已經(jīng)被運(yùn)用到該系統(tǒng)及數(shù)據(jù)交換設(shè)備的電路設(shè)計(jì)，且能夠基于公共交換電話網(wǎng)絡(luò)

38、進(jìn)行傳輸數(shù)據(jù)。在本論文中，我們調(diào)查了迷你型遠(yuǎn)程數(shù)據(jù)交換設(shè)備，其可以通過pstn和遠(yuǎn)程主機(jī)進(jìn)行數(shù)據(jù)交換。該系統(tǒng)原理和設(shè)備的電路設(shè)計(jì)已經(jīng)被仔細(xì)的研究。這項(xiàng)研究結(jié)果可能有助于對(duì)基于pstn的數(shù)據(jù)交換設(shè)備的設(shè)計(jì)和一般使用特殊目的的通信網(wǎng)絡(luò)系統(tǒng)的建設(shè)。2 迷你型遠(yuǎn)程數(shù)據(jù)交換裝置的原理迷你型遠(yuǎn)程數(shù)據(jù)交換設(shè)備在非工業(yè)領(lǐng)域被認(rèn)可。在日常生活中，公眾很想知道數(shù)據(jù)和信息如何通過遠(yuǎn)程主機(jī)和數(shù)據(jù)庫(kù)進(jìn)行交換。因此設(shè)備應(yīng)滿足以下要求：1）可通過pstn傳輸數(shù)據(jù)。2）年限的維護(hù)費(fèi)用相對(duì)較低。3）它需要相對(duì)小的尺寸，易于攜帶。4）它應(yīng)該很容易操作，不需要一定的培訓(xùn)管理。當(dāng)數(shù)據(jù)用戶分散在不同的地理位置，迷你型遠(yuǎn)程數(shù)據(jù)交換設(shè)備是

39、用來與遠(yuǎn)程主機(jī)的數(shù)據(jù)庫(kù)中的數(shù)據(jù)進(jìn)行數(shù)據(jù)交換。用戶可以建立一個(gè)連接的遠(yuǎn)程主機(jī)一個(gè)迷你型遠(yuǎn)程數(shù)據(jù)交換設(shè)備。該裝置可用于如家庭或旅館或在任何地方的pstn存在的地方，就可以通過一條電話線交換主機(jī)電腦。這將提高工作效率，減少開支。 因?yàn)閿?shù)字信號(hào)不適合成對(duì)的公共交換電話網(wǎng)絡(luò)，用戶和服務(wù)器之間的通訊線路傳輸，必須通過使用一個(gè)調(diào)制解調(diào)器調(diào)制數(shù)字信號(hào)。itu-t已經(jīng)規(guī)定了多種調(diào)制解調(diào)器的標(biāo)準(zhǔn)。v0.34標(biāo)準(zhǔn)支持的速度為28kpbs。升級(jí)后的版本為v.34。v.34附件1201h支持的速度為33.6kbps，通過使用數(shù)據(jù)壓縮（v.42bis），最高速度可達(dá)133.8kbps。一個(gè)新的標(biāo)準(zhǔn)是v.90，可以傳輸?shù)臄?shù)據(jù)是56kbps，并且通過數(shù)據(jù)壓縮率較高。迷你型遠(yuǎn)程數(shù)據(jù)交換設(shè)備是用于小型和簡(jiǎn)