Fourier Analysis of a sound wave.

Question

Niall Campbell 2020-10-20

回答： Ayush Bansal 2020-10-27

I have micriphone data which i want to analyse.

The data is in Volts and the microphone sensitivity is 49.5 mV/Pa.

I want to convert the microphone signal into pressure in Pascals, Pa.

The next step is to find the max sound pressure level (SPL) magnitude and the root mean square, RMS, of the signal.

I then want to convert these into sound pressure level in dB.

Answer 1

Ayush Bansal 2020-10-27

Use Pressure (Pa)=Volts(mv)/sensitivity(mV/Pa) to calculate pressure from voltage.

Use max(A) which returns the maximum element of an array, given A is vector, to find max sound pressure level.

Use rms(x) to find rms of input x.

Use 20log(P/Po), where Po is reference sound pressure 0.000002Pa and P is the pressure, to get values in dB.