CSD313L_SoundIntensityPressureNarration

4 2 x 10 5 20 log104 x 10 12 x10log log 10 5

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Unformatted text preview: 5)) =20 * log10((4 x 10-1)/(2 x10log log 10 5 )) = 20 * log10(2 x104) = 20 * 4.3 = 86 dB SPL )) log – Sound A: 90 dB IL and Sound B: 86 dB SPL – dB IL = dB SPL Sound level of multiple sounds Sound When two or more than two sounds are When played simultaneously, how much is the total level? total For example, two sounds are played at the For same time, both at 60 dB SPL, the total level is level – 60 + 60 = 120 dB SPL ? Sound level of multiple sounds Sound When two or more than two sounds are When played simultaneously, the total level is ALWAYS computed in dB IL with adding their absolute intensity first. their Step by step – Get intensity of each sound, Ix1, Ix2, Ix3 … x3 – Ix = Ix1 + Ix2 + Ix3 + … x2 x3 – dB IL = 10*log10(Ix/Ir) = 10*log10((Ix1+Ix2+Ix3+…) / +…) Sound level of multiple sounds Example Example Given two sounds, A and B, are played Given simultaneously, with each at 60 dB IL, how much is the total dB IL? is Step by step – First, we will get IxA and IxB xB 10 dB 60/10 – IxA = Ir * 10 dB ILA//10 = 10-12 * 1060/10 = 10-12 * 106 =10--6 10 10 =10 6 watt/m2 watt/m 6 – Simmilarly, IxB = 10--6 watt/m2 watt/m – Ix = IxA + IxB = 10--6 + 10--6 = 2 * 10--6 watt/m2 10 6 10 6 10 6 watt/m xB – Total intensity dB IL = 10*log10(Ix / Ir) = 10*log10(2 x10-6 / 10-12) =...
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This note was uploaded on 02/01/2014 for the course CSD 313L taught by Professor Liu during the Summer '08 term at University of Texas at Austin.

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