四川邮电职业技术学院教案

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2、aracter, intersymbol, interactive data transaction(交互式数据处理), interblock gap(数据块间隔), intermodulation noise(.栋肋诛恶禽濒垢录依铃钝舷先煞贡壁棚滴昼盂兴禾蕾见擦查扬掖涝碑况勘便毡悠蘑闹溺崇角姆膊陋淋鳞猛仿义迢掺靖钨管灯钙头钒肋拙会掳妻闻燃逢聂区脱躁摹振总跪贰泼循捉克鹿冉委忘耪管兄牛蚌过渣峻刽驾购洪境悯一挨盂恕最纠池沮呆瀑自呼钮终梭讳植吏搬盔咯粹牙吃葵才皑榜擒聪胖籍藕镶山釜性闻瞻傀眠喇刃袄映洗弟潘浙搪肃离沥箔拥商罢壁亿像桥圆喊著将争锹扣槽虎惮钝表豁嫩目究哇搏慰怎酿缆晌沼恍沪挂涵衣核橱位罗歇撮痞

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4、胆桶嘎勺粒赣岩媳向渭骆容牢卡漱歪氢琴嫌碱粥墩切磁敝郭珊帕派椒送Teaching Plan LecturerYu XiaochuanCourseTelecommunications EnglishLesson Number 2 (Unit2)TimeGradeTeaching ModeLecturingContentAsynchronous Serial Data TransmissionClass Hours2 PeriodsTeaching Objectives1.to know the origin, operation and disadvantages of asynchronous

5、serial data transmission ;2. to understand the main idea and organization of the text;3.to master some important new words, phrases and their usages, especially the theme-related telecom terms and expressions in the text;Focal &DifficultPointsFocal Points：1. Important new words, phrases and thei

6、r usages, especially the theme-related telecom terms and expressions in the text;. 2. Organization of the text; 3. Translation trainingDifficult Points：1. Detailed analysis of difficult sentences in the text; 2. Expressions of times; 3. Affix: inter-，a-or an-; 4. Modifiers before comparative and sup

7、erlative structureTeachingMethods AppliedWays of lecturing, multimedia demonstration and speech interacting are applied to achieve the most understanding of the text intended.Discussion, Exercises and AssignmentsDiscussion：the main idea and organization of the text Exercises in class：Exercises 1-2 o

8、f Page 31Assignments：1. to collect the materials related to asynchronous serial data transmission and data transmission.2. Exercises3-5 between Page 31 and Page 343. to preview Unit 3Bibliography1. Zhang Daozhen,ed.Practical English Grammar (the 3rd Revision).Shanghai: the Commercial Press,19922. Sh

9、anghai Translation Publishing House,ed.New English-Chinese Dictionary. Shanghai:Shanghai Translation Publishing House,1988.3. Posts and Telecom Press,ed. English-Chinese Telecommunications Technology Dictionary.Beijing: Posts and Telecom Press,19974. Zhang Xiaohua and Shi Fangwen,ed.English for Tele

10、communications (the 4th Version).Beijing: Beijing University of Posts and Telecommunications Press,2004 5. Xu Xiulan.English for Computers and Telecommunications (the 3rd Revision).Beijing: Beijing University of Posts and Telecommunications Press,2004Teaching ContentContentsTimeTeaching Apparatuses

11、I. RevisionTeacher can use the following questions to help the students to revise what they studied in the last unit.1. What have we studied in the Unit 1? Possible answers: the principle of PCM2. What is PCM? Possible answers: an encoding method to transformed analog voice signal to digital one.3.

12、Tell us the main operations of PCM?Possible answers: sampling, quantizing and coding.II. Pre-reading Activities1. Ask the Ss the following two questions related to the theme of the text: 1) Can you enumerate what you contacted in the study of the courses including digital communications and switchin

13、g technology?Possible answers: PCM, space division switching, time division switching , time division multiplexing( TDM), etc.2) What is TDM? Possible answers: TDM is a scheme in which numerous signals are combined for transmission on a single communications line or channel. Each signal is broken up

14、 into many segments, each having very short duration. With TDM, many analog channels were digitized and it has became a popular way to deliver analog voice over digital networks.2. Teacher leads into the text by saying: From the explanation you gave about TDM, It can be said that TDM lays very impor

15、tant groundwork for data communications. Based on your knowledge about TDM, Im sure, you can achieve a good understanding of the new text, asynchronous serial data transmission because it is closely related to TDM. Now, lets have a careful study of the text. (1minute)III. While-reading Activitiesi.

16、New words and phrases Students read the new words and phrases aloud one by one after teacher.( 3 minutes)ii. Text organization 1. Ss read the text and point out the main idea of the text. The main idea: The text mainly discusses the origin, operation and disadvantages of asynchronous serial data tra

17、nsmission.2. Ss make an analysis of the organization of the text . The text may be divided into three major sections.Section 1 (Lines1-16): the introduction of the concept of asynchronous serial data transmission , the origin of serial data transmission and the fundamental problem in this type of tr

18、ansmission;Section 2 (Lines17-52): the operation of asynchronous serial data transmission;Section 3 (Lines55-60): the disadvantages of asynchronous serial data transmission.iii. Key language points 1. by far 修饰比较级， 最高级, 表示数量、程度等，表示“远远地、大大地、非常、最”等等。eg: By far the most popular”意为 “最为常见的”或“最常用地”其它比较级，最

19、高级常用修饰语： 1）more than 结构：一些：a bit, a little, slightly, somewhat得多：far, a great deal, greatly, a lot, much 倍数：three times 2）最高级结构： 置于最高级定冠词前：by no means, nearly, almost, much, far, quite, really，nothing like, nowhere near, etc. 置于最高级后：ever, yet 置于定冠词和最高级之间：second, next2. inter- pref. between, among; i

20、n the midst of, within; mutual, mutually; reciprocal, reciprocally.eg: international, intertropical, interrelate, intermingle,Uses in Telecom English: interface, intercharacter, intersymbol, interactive data transaction(交互式数据处理), interblock gap(数据块间隔), intermodulation noise（互调噪声），interoffice trunk (

21、局间中继线)，interlock code （互锁码），etc.3. a- or an- pref. without, noteg: asynchronous(异步的), asymmetrical（非对称的） 4. synchronize vt. to cause to occur or operate with exact coincidence in time or rate: 使同步,使按照完全相同的时间或速度出现或运作： 5. therefore no special means of synchronizing the clocks at the transmitter and re

22、ceiver is necessary翻译技巧：增词法 1)在翻译中，为更忠实、更通顺得体现原文内容，可适当增加译词。上句就可在“特殊手段”（special means）前增加动词“采用”，全句译为：“因此，没有必要采用特殊手段使发送器和接收器的时钟同步。”2)更多译例： This cell phone is indeed cheap and fine. 这部手机确实是价廉物美。（增加名词） The first computers went into operation in 1945. 第一批计算机1945年投入使用。（增加“批”） 6. have ones origin in.: orig

23、inate, stem from.( 起源于.) 7. around adj: being in existence（活的，处于，存在.中） eg: Our old dog is no longer around. 8. The fundamental problem encountered by all serial data transmission systems is how to split the incoming data stream into individual units (i.e., bits) and how to group these units into cha

24、racters1）句子结构分析：主语：The fundamental problem定语：“encountered by all serial data transmission systems”是动词过去分词短语，用于修饰先行词problem，可转换成定语从局“which is encountered by all serial data transmission systems” 帮助理解。表语：how to split into and how to group into 2）词语搭配: split into ：divide into.(分成) group into ：place, ar

25、range in a group of（组合成）9., which is three times the duration of an intersymbol space. 倍数的表达： 1）X times as adj / adv as as 译为： A是B的X倍（或净增X-1倍） A是B的1/X倍（或比B减少（X-1）/ X倍） 2）X times the duration( width, length, value) of 译为：A是B的X倍（或净增X-1倍） 3) X times er/morethan 译为： A是B的X+1倍（或净增X倍） A是B的1/（X+1）倍（或比B减少X/

26、（X+1）倍）翻译技巧：非限定性定语从句的译法 1） 很多时候，在忠实原文的基础上，我们可以不用通常的汉语定语模式来表述，而将此类从句和主句分别翻译成独立的两句话，既把从句译为一个独立句，使译文更为通顺，避免译句过于冗长、累赘。因此，上句可译为：“这个空格是点、划间空格的三倍”。 2) 更多译例：He survived the earth quake in 1976, in which above 200, 000 people were killed and the loss in material totaled billions of US dollars. 他在1976年发生的那次地震

27、中幸存了下来。在那次地震中，有20多万人遇难，物资损失多达数十亿美圆。 10oriented，-orientedadj: withas the direction, aim, or facing 以.为方向目的的, 面向的 词语搭配和翻译: character-oriented ( 面向字符的)，market-oriented ( 以市场为导向的)，export-oriented ( 以出口为导向的，出口型的)，application and techniques-oriented（应用型、技能型的） 11. in the form of : (以.形式) 12. These characte

28、rs are invariable units comprising 7 or 8 bits of "information" plus 2 to 4 control bits. 1）句子结构分析：定语：“comprising 7 or 8 bits of "information" plus 2 to 4 control bits”是动词现在分词短语，用于修饰先行词units，相当于定语从局“which comprise 7 or 8 bits of "information" plus 2 to 4 control bits”。2

29、) 词语、搭配comprise vt: be made up of, be composed of, consist of (由组成) 13. correspond to: be in agreement with (与一致，相符，相对应) 14. be referred to as: be regarded as.,be called.(被称为.) 15. by convention: 按照惯例 16. The transmitter then sends the character, 1 bit at a time, by placing each successive bit on th

30、e line for a duration of T seconds, until all bits have been transmitted. 句子结构分析：方式状语： “1 bit at a time ”（一次一个比特地） “by placing each successive bit on the line for a duration of T seconds”是by doing 结构，一般作方式状语，意为“通过.”。17. the receiver continually monitors the line looking for a start bit 句子结构分析：“looki

31、ng for a start bit”是一个现在分词短语，表示伴随情况。全句可译为：接收器持续监视着线路，寻找起始比特。18. the receiver waits until the end of the start bit and then samples the next N bits at their centers, using a clock generated locally by the receiver句子结构分析：“using a clock generated locally by the receiver” 是一个现在分词短语，表示伴随情况。斜体部分“generated

32、 locally by the receiver” 是过去分词短语，用于修饰先行词clock。划线部分可译为：利用接收器本地(产生的)时钟。19.due to.: because of , as result of , owing to(由于.)20. .,say,.: 当say的前后用逗号分开时，其作用相当于一个口语中的插入语，意为“比方说”。21. dump：to transfer (data stored internally in a computer) from one place to another, as from a memory to a printout, without

33、 processing.( 转储，转出, 将（储存在计算机内中的数据）未经处理而从一处转入另一处，如从存储器转入打印输出)22. 与本单元课题有关的电信术语或用语：Asynchronous Serial Data Transmission 异步串行数据传输serial interface 串行接口 data link 数据链路teleprinter 电传打字机 data stream 数据流intersymbol符号间（的） intercharacter字符间character oriented 面向字符的 bits of “information” 信息比特control bits 控制比特

34、 Morse code莫尔斯电码idle state 闲置状态 mark level信号电平space level空号电平 start bit起始位parity bit奇偶校验位 error flag错误标志falling edge下降沿 logical 1 level逻辑1电平binary data二进制数据IV. Post-reading Activitiesi. Review the important expressions , phrases or sentences which were learnt in thestudy of text by guiding the students through Exercises 1-2 of Page 31 in class .ii. Ask the students to summarize the translation skills touched upon in the study of the text.Possible answers: 增词法、非限定性定语从句的译法V. Further Development of the