Frequently Asked Question

How do we set microphone gain? We have -10dB and -20Db switch on the microphone and CUTPRO gain is set to 1.
Last Updated 3 months ago

Lets review the dB in signal processing first.

x=10^y and logx=ylog10=y

Example with the microphone at the —10Db setting:
20logx=—10db , logx=—10/20=—0.5 , x=10^(—0.5)=1/sqrt(10)=0.31
It means the microphone output is multiplied by 0.31 times.

Example with the microphone at the —20Db setting:
20logx=—20db , logx=—1, x=10^(—1)=1/10=0.1
It means the microphone output is reduced by 10 fold.

It is better to use —10dB (less attenuation) but you must make sure that the NI DAQ card must not saturate (do not exceed +-5V). If the noise is too high, microphone will create voltage beyond 5V which will saturate NI and you will always get 5V. In that case, use -20dB.

CUTPRO does not alter the sound dB measurement if you use a gain value of 1, what ever microphone is giving. This is recommended so that you can use microphones measurement directly without altering it.

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