how to convert decibels(dB) into sound pressure(Pa).
eg 150db means =.......pa[/quote]
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conversion decibel to sound pressure
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Re: conversion decibel to sound pressure
by Guest » Thu Dec 11, 2008 2:48 am
[/quote]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
- Guest
Re: conversion decibel to sound pressure
by 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.
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]
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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3 posts
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