how to calculate signal to noise ratio for a sound recorded by microphone?

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ania Bakry - 2024-02-20T20:16:19+00:00
Question: how to calculate signal to noise ratio for a sound recorded by microphone?

i am trying to make a noise detection tool to detect weather the room is very noisy, noisy or quite .. so how can i calculate the signal to noise ratio for recorded sound for 200 mSec. ?  

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    • Expert Answer

    Profile picture of Kshitij Singh Kshitij Singh answered . 2025-11-20

    to tell if a place is noisy, pros usually measure

     

    dBA: on a microphone with known reception diagram, weighted air pressure signal power
    weighted, you have to ponder the audio frequencies to correct the human hearing that is not flat over audible frequencies.
     
    MATLAB already has an Audio Toolbox that, once the hardware correctly set up, allows to measure both audio pressure power weighted and unweighted.
     
    There is already a standard dBA scale: for instance 30dBA is quiet, 120dBA is ~30m from jet take-off, there is a standard once you get to catch dBA in order to tell how noisy is a place.
     
    If you decide to implement the weighting, the function is applied to spectrum amplitude.
     
    To calculate audio SNR you may want to consider a sample measurement without the signal, calculate the noise power, then apply the signal, calculate signal power, and then SNR.


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