I'm studying the phenemenon of band gaps in a experiment, however the stop bands are proving hard to define using just a transmission spectrum dervived from the fft alogrithm.(adsbygoogle = window.adsbygoogle || []).push({});

I've heard that it may be possible to define the band region by plotting the dispersion relation of sound waves the sound waves and looking for regions of anomalous dispersion. Unfortunately I have no idea how to go about this, does anyone have any info on this sort of analysis that could get me started?

Could someone tell me which FT alogorithm I would need to get phase data as I think the fft only give amplitude and requency info?

Oh and one last thing, does anyone know how I can convert a matrix in matlab into one long vector (so that each successive column is kind of added to the end of one large column) I've been trying this for a while but not getting very far.

Thanks

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# Dispersion relation with Matlab

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