电子与通信技术专业英语(第4版)Unit-2--lesson-10课件.ppt

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1、PART1Aportablemediaplayer(PMP),isaconsumerelectronicsdevicethatiscapableofstoringandplayingdigitalmediasuchasaudio,images,video,documents,etc.Thedataistypicallystoredonaharddrive,microdrive,orflashmemory（asshowninFig.10-1）.Digitalaudioplayersaregenerallycategorizedbystoragemedia:Flash-basedplayers:T

2、hesearenon-mechanicalsolidstatedevicesthatholddigitalaudiofilesoninternalflashmemory.Becausetheyaresolidstateanddonothavemovingparts,theyrequirelessbatterypower,andmaybemoreresilienttohazardssuchasdroppingorfragmentationthanharddisk-basedplayers.Harddrive-basedplayersordigitaljukeboxes:Devicesthatre

3、addigitalaudiofilesfromaharddiskdrive(HDD).Theseplayershavehighercapacitiesasof2010rangingupto500GB.Attypicalencodingrates,thismeansthattensofthousandsofsongscanbestoredononeplayer.ThedisadvantageswiththeseunitsisthataharddriveconsumesmoreLesson10PortableMediaPlayerExercisesPART2Lesson10PortableMedi

4、aPlayerpower,islargerandheavierandisinherentlymorefragilethansolid-statestorage.MP3CD/DVDplayers:PortableCDplayersthatcandecodeandplayMP3audiofilesstoredonCDs.Suchplayersaretypicallymuchlessexpensivethaneithertheharddriveorflash-basedplayers.TheblankCD-Rmediatheyuseisveryinexpensive,typicallycosting

5、lessthanUS$0.15perdisc.ThesedeviceshavethefeatureofbeingabletoplaystandardRedbookCD-DAaudioCDs.Adisadvantageisthatduetothelowrotationaldiskspeedofthesedevices,theyareevenmoresusceptibletoskippingorothermisreadsofthetheyaresubjectedtounevenacceleration(shaking)duringplayback.Themechanicsoftheplayerit

6、selfhowevercanbequitesturdy,andaregenerallynotaspronetopermanentdamageduetobeingdroppedasharddrive-basedplayers.SinceaCDcantypicallyholdonlyaround700megabytesofdata,alargelibrarywillrequiremultiplediskstocontain.However,somehigher-endunitsarealsocapableofreadingandplayingbackfilesstoredonlargerExerc

7、isesPART3Lesson10PortableMediaPlayercapacityDVD;somealsohavetheabilitytoplaybackanddisplayvideocontent,suchasmovies.Anadditionalconsiderationcanbetherelativelylargewidthofthesedevices,sincetheyhavetobeabletofitaCD.Networkedaudioplayers:Playersthatconnectvia(WiFi)networktoreceiveandplayaudio.Thesetyp

8、esofunitstypicallydonothaveanylocalstorageoftheirownandmustrelyonaserver,typicallyapersonalcomputeralsoonthesamenetwork,toprovidetheaudiofilesforplayback.USBhost/memorycardaudioplayers:PlayersthatrelyonUSBflashdrivesorothermemorycardstoreaddata.PMPsarecapableofplayingdigitalaudio,images,andvideo.Usu

9、ally,acolorliquidcrystaldisplay(LCD)ororganiclight-emittingdiode(OLED)screenisusedasadisplay.Variousplayersincludetheabilitytorecordvideo,usuallywiththeaidofoptionalaccessoriesorExercisesPART4Lesson10PortableMediaPlayercables,andaudio,withabuilt-inmicrophoneorfromalineoutcableorFMtuner.Someplayersin

10、cludereadersformemorycards.ExercisesFig.10-1PortablemediaplayerPART6Newwordsandphrases:inherentlyinhirntliadv.内在地；固有地fragilefrdailadj.脆弱的，易碎的decodedi:kudv.解码rotationalruteinladj.转动的susceptiblesseptibladj.易受影响的sturdyst:diadj.结实的，坚固的megabytemegbaitn.兆字节high-end高端的servers:vn.服务器accessoryksesrin.配件，附件ca

11、blekeibln.电缆ExercisesPART7PhrasesandExpressionsPMP(PortableMediaPlayer)便携式媒体播放器HDD(HardDiskDrive)硬盘驱动器CD-DA(CompactDiscDigitalAudio)数字音频光碟LCD(LiquidCrystalDisplay)液晶显示器OLED(OrganicLight-EmittingDiode)有机发光二极管Newwordsandphrases:ExercisesPART8Notes:1.Becausetheyaresolidstateanddonothavemovingparts,they

12、requirelessbatterypower,arelesslikelytoskipduringplayback,andmaybemoreresilienttohazardssuchasdroppingorfragmentationthanharddisk-basedplayers.译文：因为他们是静态存贮装置，并没有移动的部件，因而需要的电量更少，在播放过程中很少会出现跳读现象，而且与硬盘存储播放器相比，更能经受住诸如掉落或碎裂等此类情况所造成的损害。2.Theseplayershavehighercapacitiesasof2010rangingupto500GB.译文：在2010年，这

13、些播放器就有高达500GB的容量。asof(asfrom):从时起，如：OurfaxnumberischangingasofMay12.3.theyareevenmoresusceptibletoskippingorothermisreadsofthetheyaresubjectedtounevenacceleration(shaking)duringplayback.译文：如果他们在播放过程中遇到不规则的加速度（震动），就更容易出现跳读或误读文件的情况。besubjectedto:遭受，经受，如：Idrathernotliveinanareathatissubjecttoflooding.E

14、xercisesPART10Exercises:1.WriteT(True)orF(False)besidethefollowingstatementsaboutthetext.a.APMPisadevicethatisonlycapableofplayingdigitalaudioandvideo.b.Flash-basedplayersareconsumerelectronicswhicharesolidstateandhavemovingparts.c.Comparedtoaharddrive,solid-statestorageissmallerandlighter.d.ACDcanh

15、oldasmuchdataasyouwant.e.CDplayersarelikelytoskipormisreadoftheplaybackifmishandled.f.Networkedaudioplayersusuallyhavetodependonaserverastheydonothaveanylocalstorageoftheirown.g.Withthehelpofsomeaccessoriesorcable,aPMPcanrecordvideoaswellasaudio.2.Fillinthemissingwordsaccordingtothetext.a.Digitalaud

16、ioplayersaregenerallycategorizedbysuchmediaas,.b.Attypicalrates,thismeansthattensofthousandsofsongscanbeononeplayer.c.Aharddrivewhichmorepowerislargerandheavier,andisinherentlymorethansolid-statestorage.d.Networkedaudioplayersaretheplayersthatconnecttoreceiveandplayaudio.ExercisesExercises:3.Transla

17、tethefollowingparagraphintoChinese.Harddrive-basedplayersordigitaljukeboxes:Devicesthatreaddigitalaudiofilesfromaharddiskdrive(HDD).Theseplayershavehighercapacitiesasof2010rangingupto500GB.Attypicalencodingrates,thismeansthattensofthousandsofsongscanbestoredononeplayer.Thedisadvantageswiththeseunits

18、arethataharddriveconsumesmorepower,islargerandheavierandisinherentlymorefragilethansolid-statestorage.ExercisesPART11MP3CD/DVD播放机：便携式CD播放机可以解码和播放存储在光盘上的MP3音频文件。这样的播放器通常比硬盘或闪存播放器便宜得多。它们使用的空白的CD-R非常便宜，一般每张光盘花费不到0.15美元。这些器件具有能够播放标准的“红皮书”CD-DA音频CD的功能。其缺点是，由于这些设备的旋转磁盘速度很低，如果它们在播放过程中遇到不规则的加速度（震动），就更容易出现跳读

19、或误读文件的情况。这种播放器比硬盘型播放器坚固，一般不容易因为被摔到地上而出现永久性损坏。由于CD通常只能容纳大约700兆字节的数据，一个大型文库往往需要多个磁盘来容纳。然而，一些较高端的播放机也能读取和播放那些存储在容量更大的DVD中的文件；还有的播放机还能播放和显示视频内容，例如，电影。我们还需要了解的是，这些设备具有较大的宽度，因为它们要容纳整个CD光盘。网络音频播放器：播放器通过联网（WiFi）接收和播放音频。这种类型的播放器一般没有自己的存储器，需要依靠一台服务器，通常为一台连接在同网络上的私人电脑，来提供音频文件进行播放。USB主机/存储卡音频播放器：播放器依靠USB闪存驱动器或其它存储卡读取数据。PMP能够播放数字音频、图像和视频。一般使用彩色液晶显示屏（LCD）或有机发光二极管（OLED）屏幕进行显示。不同类型的播放器包括的功能有：录制视频，通常借助可选附件或电缆；录制音频，借助一个内置麦克风或线路输出电缆或FM调谐器。一些播放器具有存储卡读取器，鼓励使用者将外部存储器或传输介质装在播放器上。ExercisesPART13