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1、第一课1.将下述句子译成英文。(1)Ananaloginformationsourceproducesmessagesthataredefinedonacontinuum,whileadigitalinformationsourceproducesafinitesetofpossiblemessages.(2)Thebeacon-firetowerinancientChinawasacommunicationssystem.(3)Showthattheentropyisamaximumwhentheprobabilityofsendingabinary1isequaltotheprob
2、abilityofsendingabinary0.(4)Informationcapacityisameasureofhowmuchinformationcanbetransferredthroughacommunicationssysteminagivenperiodoftime.(5)Thewiderthebandwidthandthelongerthetimeoftransmission,themoreinformationcanbeconveyedthroughthesystem.2.Answerthefollowingquestions:(1)SamuelMorsedevel
3、opedthefirstelectroniccommunicationssystemin1837.(2)Yes.(3)Thevacuum-tubetriode.(4)Hartley’slawsimplystatesthatthewiderthebandwidthandthelongerthetransmissiontime,themoreinformationthatcanbeconveyedthroughthesystem.TheShannon’sformulaisI=Blog2(1+S/N),whereI=informationcapacity(bps),B=bandwidth(H
4、z),S/N=signal-to-noisepowerratio(unitless).(5)(a)VLF,(b)MF,(c)SHF第二章信息源1.根据课文回答下列问题。(1)Therearefourimportantinformationsources:speech,music,pictures,andcomputerdata.(2)Threesuccessivestages:production,propagation,andperception.(3)Thebandwidthof300to3100Hz.(4)Amusicalsignaldiffersfromaspeechsigna
5、linthatitsspectrumoccupiesamuchwiderbandoffrequenciesthatmayextenduptoabout15kHz.(5)Thedynamicpictures,asintelevision,areinmotion;whilethestaticpictures,asinfacsimile,arestill.(6)Inblack-whiteTV,onlyaluminancesignalisneeded.However,incolorTV,therearethreesignals:aluminancesignalandapairofchromin
6、ancesignals.(7)Yes.(8)Supposethesevendatabitsare0110101.Fortheoddparity,anextraparitybitof1shouldbeended,sothatthetotalnumberof1sis5,whichisodd.(9)Losslesscompressionoperatesbyremovingtheredundantinformationcontainedinthedataofinterest.Lossycompressioninvolvesthelossofinformationinacontrolledman
7、ner.Lossycompressionmayachieveacompressionratiohigherthanthatattainablewithlosslessmethods.(10)Therearefourdistinctoperations:time-frequencymapping,psychoacousticmodeling,quantizationandcoding,andframe-packing.1.翻译下列词汇。synch
