Banded Waveguides in Higher Dimensions

If we were to hit a square membrane, record the sound, and inspect the spectrum, we would be able to (depending, of course, on how and where we hit it) observe these modes. We could use additive exponentially decaying sinusoids, or modal filters, to model the observed modes. But neither of these methods takes into aecount the spatial aspects of the boundaries excitation and vibration. 

If we remember our development and use of banded waveguides (Section 9.4), we added delay lines to model the frequency dependent 

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