资源描述：
《手机声学原理介绍》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、LearningreportonprinciplesofacousticsofthecellphoneZHOUYang-fangOnceintheSunliteElectronic(ShenZhen)co.,ltd,ShenZhen518000,ChinaAbstract:Thesedays,throughthechectofkindsofmaterial,Ihaveageneralideaofthemobilephoneacousticsandmakearelavantarrangement,makingmainlyasummaryreportin
2、here.Thesoundsystemofthephonehavethethreebasicfunctiondevicesthatincludethespeaker,thereceiver,andthemicrophone.Thespeakeristorealizethehand-freecellphoneconversationandthespeechbroadcasting,thereceiver’spurposeisthatthevoicemessengerisreceivedbythephone,andthemicrophone’sfunct
3、ionisthattheacousticinformationispassedfrompeopletophone.Theyrealizethefundamentalfunctionofthephoneandperfectlydeducethephone’srolesinthedailylifesothatwecannotdowithoutit.Keywords:Acousticsofthecellphone,acousticsdevices,soundwave,theworkingprinciple,shortcircuitingeffectCont
4、ent:1.Thebasicknowledgeoftheelectroacoustics1.1Soundpropagationmode1.2Speedofsound1.3Frequencydomain1.4Soundpressurelevel1.5Voicethreeelements2.Acousticsdevicesofthephone’sstructure3.WorkingprincipleofSPK.&RCV.3.1Thebasicprincipleofapplication3.2Workongprinciple3.3DifferenceofS
5、PK.&RCV.3.4ThebasicparametersofSPK.&RCV.4.TheacousticshortcircuitingeffectText:1.Thebasicknowledgeoftheelectroacoustics1.1SoundpropagationmodeSoundtransimissionneedsthemediumandsoundcan’ttravelthroughavacuum.Soundwavebelongstothelongitudinalwave1.2SpeedofsoundSpeedwhichsoundtra
6、velsthroughtheairis344m/s,atnormaltemperaturesandpress-ures.Thehighterthetemperatureis,thegreaterthesoundvelocityis.Andsoundtravelsfasterintheliquidandthesolidthanthroughtheair.Therelationshipsofsoundspeedthroughtheairandtemperatureisthat,c(t℃)=331.6+0.6tm/s1.3FrequencydomainUa
7、ually,frequencyrangeis20HZto20KHZ.Thesoundwave,whoserangeisbelow20HZ,iscalledtheinfrasonicwave,whilethesoundwavewhoserangeisabove20KHZiscalledtheulfrasonicwave.Buttherangeofspeechtoneis300HZto3400HZ.1.4Soundpressurelevel(earacceptable)SPLisdenotedbythesign“Lp”,whoseresultisdeno
8、tedbythesign“db”.SPL’sexpres-sionisasbelow:Lp=20㏒10P/P
