conversion decibel to sound pressure

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conversion decibel to sound pressure

Postby umesh » Wed Dec 10, 2008 11:28 pm

how to convert decibels(dB) into sound pressure(Pa).
eg 150db means =.......pa[/quote]
umesh
 

Re: conversion decibel to sound pressure

Postby Guest » Thu Dec 11, 2008 2:48 am

umesh wrote:how to convert decibels(dB) into sound pressure(Pa).
eg 150db means =.......pa
[/quote]

dB = 20*log(P/Pref) where Pref = 20 µPa

So P = Pref * 10^(dB/20)

for 150 dB. Pa = 20 µPa * 10^7.5 = 632.5 Pa
Guest
 

Re: conversion decibel to sound pressure

Postby dkc » Fri Dec 12, 2008 12:49 am

I hope the person asking this question is doing conversions in AIR...because the conversion for sound underwater uses a
P ref of 1 µPa and not 20µPa. Even physicists seem to miss this important point, so be careful.

Anonymous wrote:
umesh wrote:how to convert decibels(dB) into sound pressure(Pa).
eg 150db means =.......pa


dB = 20*log(P/Pref) where Pref = 20 µPa

So P = Pref * 10^(dB/20)

for 150 dB. Pa = 20 µPa * 10^7.5 = 632.5 Pa[/quote]
dkc
 


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