Comm Diss 311-page11

Comm Diss 311-page11 -...

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Unformatted text preview: 49.Itispossibletohaveasoundthatis10dBSPL.(Yes,ofcourse). 50.IftwonoiseswithequaldBSPLsareadded,thetotalis1additionaldB.(No,3 dB) 51.Thestatement"Thatsoundis40dB"ismeaninglesswithoutknowingthe reference.(True,thereneedstobeareference) 52.Thestatement"Thatsoundis40dBSPL"ismeaninglessbecausethereisno reference.(False,nowthereisareference,e.g.,10^12watts/m2). 53.OneexampleofareferencepressurefordBSPLis.0004dynes/cm2.(No,.0002 dynes/cm2) 54.ThenumberofdBcorrespondingtoanintensityratioof40:1isapproximately 16dB.(Yes,afactorof10is10dBandtwodoublingsisanother6,oryoucanjust calculate10log(40) 55.ThenumberofdBcorrespondingtoapressureratioof40:1isapproximately32 dB.(True) 56.Theintensityratiocorrespondingto60dBis100,000,000:1.(No,1,000,000:1) 57.Ifeveryonesingsatthesamelevel,achoruswith100singersshouldmake10 moredBthanachoruswith5singers.(No10log(100/5)is13dB). 58.75dBSPLisequivalentto3.16x10^5watts/m2ofacousticintensity.(True) 59.62dBSPL+68dBSPLisabout71dBSPL.(No,closerto69dBSPL). 60.Aplotofanimpulseresponsewillhaveamplitudeontheyaxis(ordinant)and frequencyonthexaxis(abscissa).(No,timeisontheabscissa) 61.Asystemwithalongimpulseresponsecan'tdomuchfiltering.(False,thelong impulseresponsesmeanverysharpfiltering). 62.Onecouldcreatealinearsystemsuchthatasinewaveattheinputcouldbe transformedintoatrianglewaveattheoutput.(No,thatwouldmeanagreatedeal ofharmonicdistortion,notacharacteristicofalinearsystem). 63.Animpulseresponseisamplitudeoverfrequency.(Noamplitudeovertime, whoops,arepeat,Iguessofnumber60) 64.Onecouldcreatealinearsystemsuchthatasquarewaveattheinputcouldbe transformedintoatrianglewaveattheoutput.(Yes,ifthefilterslopedatarateof ...
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This document was uploaded on 10/31/2011 for the course COM DIS 311 at UMass (Amherst).

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