This has nothing to do with MATLAB but it is related to signal processing and I believe there are plenty of such experts around here.
I am trying to record signals from a musical instrument with 2 microphones. The intention is to check for phase differences during the recording. However, after recording several pulses at various locations, I notice that there are no phase differences between them.
The only step I did before that was to apply a bandpass filter before the plots. The filter is applied to the signals from both microphones.