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1、EnglishOnTelecommunicationsUnit01ThePrincipleofPCMContentsCourseintroductionPre-readingActivitiesWhile-readingActivitiesNewwordsandphrasesTextorganizationTextandtranslationPost-readingActivitiesFurtherDevelopmentoftheTheme-relatedSpecializedKnowledge
2、AssignmentsCourseIntroductinFromthisperiodon,wearegoingtolearnEnglishonTelecommunications,whichisoneoftheEnglishforScienceandTechnology(EST).（What‘sthecharacteristicsofEST?)Learningthiscourse,wewillenlargeourvocabularyinthefieldoftelecommunicationsan
3、dinformation;getfamiliarwiththetermsinit;gettoknowthecharacteristicsofwritingstyleoftelecommunicationsEnglishandmasterthetranslationskillsofit;thusgreatlyimproveourprofessionalqualitiesandcommunicativecompetencyinthisglobalizedworldintheinformationag
4、e.返回Pre-readingActivitiesAsktheSsthefollowingtwoquestionsrelatedtothethemeofthetext:Whatistheheartoftechnologyincommunicationsintoday’sdigitalworld？Possibleanswers:PCM.WhyPCM?Possibleanswers:Thestreamofpulsesandnon-pulsestreamsof1’sand0’sarenoteasily
5、affectedbyinterferenceandnoise.Eveninthepresenceofnoise,thepresenceorabsenceofapulsecanbeeasilydetermined.SincePCMisdigital,amoregeneralreasonwouldbethatdigitalsignalsareeasytoprocessbycheapstandardtechniques.Thismakesiteasiertoimplementcomplicatedco
6、mmunicationsystemssuchastelephonenetworks(coveredlaterinthiscourse).返回While-readingActivities/Newwordsandphrasesprinciple［‘ｐｒｉｎｓｉｐｌ］n.原理sample［‘ｓ?ｍｐｌ］vt.采樣；樣值quantize［‘ｋｗ?ｎｔａｉｚ］v.量化，分層scheme［ｓｋｉ:ｍ］n.方案，設(shè)計(jì)，安排describe［ｄｉｓ‘ｋｒａｉｂ］vt.敘述，描述amplitude［‘?ｍｐｌｉ
7、ｔｊｕ:ｄ］n.幅，幅度binary［‘ｂａｉｎ?ｒｉ］a.二進(jìn)制的minimum［‘ｍｉｎｉｍ?ｍ］n.最小值，最小量theoretical［θｉ?‘ｒｅｔｉｋ?ｌ］a.理論上的repetition［ｒｅｐｉ‘ｔｉ??ｎ］n.重復(fù)，反復(fù)maximum［‘m?ksim?ｍ］n.最大值reduce［ｒｉ:‘ｄｊｕ:ｓ］v.減少，縮小interchange［ｉｎｔ?‘?ｅｉｎ?］v.互換，轉(zhuǎn)換上一頁(yè)返回下一頁(yè)While-readingActivities/Newwordsandphrasesmeth
8、od［‘ｍｅθ?ｄ］n.方式,方法,手段overcome［ｏｕｖ?‘ｋ?ｍ］v.克服,打敗,征服environment［ｉｎ‘ｖａｉ?ｒ?ｍ?ｎｔ］n.環(huán)境,周?chē)闆rlightning［‘ｌａｉｔｎｉ?］n.電光，閃電，雷電strike［ｓｔｒａｉｋ］n.擊，敲，打spark［ｓｐα:ｋ］vi.發(fā)火花,打火,，閃光ignition［ｉｇ‘ｎｉ??ｎ］n.點(diǎn)火,點(diǎn)火裝置satellite［‘ｓ?ｔｉｌａｉｔ］n.衛(wèi)星terrestrial［ｔｉ‘ｒｅｓｔｒｉ?ｌ］a.地球的,地面的,大地的para
