通信英语 张筱华 1 The_Principle_of_PCM

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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［‘ｓæｍｐｌ］vt.采样；样值quantize［‘ｋｗɔｎｔａｉｚ］v.量化，分层scheme［ｓｋｉ:ｍ］n.方案，设计，安排describe［ｄｉｓ‘ｋｒａｉｂ］vt.叙述，描述amplitude［‘æｍｐｌｉ

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