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What is power attenuation rate for a walking away person from the sound source?

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Question added by Muhammad Qasim , Senior Electrical Engineer , Energy Associates (SMC Ptv.) Ltd.
Date Posted: 2016/07/13
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Hagop Moumojian
by Hagop Moumojian , Founder And Owner , Silent Vox Productions

We know using the formula NdB = 10 log10 (P2/P1) formula proves that -3dB gives us half the power of the input source.

By using the Inverse square law I2/I1 = [d1/d2]2  you can calculate the Intensity in decibels in relation to distance.

For example, if the SPL at I1  is 20dB at a distance of 5 meters (d1), then the intensity of I2 , at a distance of 10 meters from I1  would be 14 dB. This means that the sound would have attenuated by 6dB in a total distance of 15 meteres.

 

 

 

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