audio recorder（Audio recorder 下载）

飞机黑匣子问答blackboxes黑匣子的功能、样式、放置、工作原理......？ Whatareblackboxes?Blackboxesareflightrecordersplacedinanaircraftforthepurposeoffacilitatingtheinvestigationofaviationaccidents.Anairplaneactuallyhastwoblackboxes.Theflightdatarecordercapturessuchinformationasaltitude,airspeed,headingandenginethrust,whichcanrevealwhetherhumanerrororinstrumentproblemscontributedtoanaccident.Thecockpitvoicerecorderpreservespilotvoicesandcockpitsounds.Whatdotheylooklike?Theblackboxesarenotblack.Theyarepaintedbrightorangetoaidintheirrecoveryafteraccidents.Theexteriorisattachedwithstripesofreflectivetape.Wherearetheyplaced?Theblackboxesareusuallyplacedinthetailofaplanewheretheyaremorelikelytosurviveacrash.Howmuchdatacanablackboxstore?Aflightdatarecorderisrequiredtostoreaminimumof25hoursofflightinformation.Acockpitvoicerecorderisrequiredtorecordaminimumof2hoursofaudioinformation.Howstrongarethey?Fortheblackboxestosurviveacrash,theyarebuilttobewaterproof,fireproof,shockproof,heatandpressureandcorrosionresistant.Theblackboxmustbeabletowithstandanaccelerationof3,400Gs(3,400timestheforceofgravity),whichequalsanimpactvelocityofabout500km/h.Itmustalsosurviveflamesupto1,100degreesCelsiusforonehour,andthebeaconshouldbeabletoemitasignaloncepersecondwhilesubmersedin6,000metersofsaltwaterforatleast30days.Howisdatafromblackboxesretrieved?Itneedsspecialtechniquetophysicallyrestoretheblackboxes.Investigatorsmayneedtocleanandvacuumdrytheblackboxesanddownloaddatafromthem.Howlongdoesittaketodecodethedata?Ittakestimetodownloadanddecipherdata.Ifthestoringunitsaredamaged,itwilltakelongertime,eitherdaysormonths.