Thesis Help Sound Intensity Probe.

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Thesis Help! Sound Intensity Probe.

My final year thesis is to implement a sound intensity probe in MATLAB using two conventional microphones. Using these microphones, i can make recordings of audio to analyse in MATLAB, with the main aim to locate the sound from the phase information, and to get intensity measurements.

My method so far has been to input the stereo recording (of a guitar playing an A note, as a simple example) as a two column matrix in matlab. Then perform an FFT on each column individually. I can extract frequency data and amplitude data, but the phase data has been causing me trouble. I need to be able to locate the sound, but have no idea how to do it. I have tried dividing the angles of the fft and plotting this against time, but i just get a blue square. Could anyone please help me, as I have spent weeks at this, and have really hit a brick wall. It's killing me!

 

[Navin A S]

A sound intensity probe can be used to measure the intensity of a sound in a particular direction, by measuring the differences in pressure between two different points. This can be accomplished in MATLAB by using two conventional microphones to record the sound. The two recordings should be recorded simultaneously and then input into MATLAB as a two column matrix. Next, you can perform an FFT on each column individually. This will give you the frequency data for each microphone as well as the corresponding amplitudes and phases. To calculate the intensity of the sound in a particular direction, you can use the phase information from the FFTs. By comparing the two phases, you can determine the angle of sound propagation, which can then be used to calculate the intensity of the sound in that direction. Finally, you can plot your results against time or frequency, to show how the intensity of the sound varies over time or with frequency. This should give you a good indication of where the sound is coming from. Good luck with your thesis!