The final report was submitted on Wednesday the 4th of September early in the morning, just a few hours before the deadline. The report was written using LaTex and can be found on My Projects. Overall the project was successful by covering all the desired topics as well as leaving plenty of room for future work.
Both experimental procedures were conducted to a high degree of accuracy, resulting on clear noticeable patterns on the measured IRs. Time nad Frequency Domain analysis was contacted for all the IRs which were also edited appropriately to extract and remove the peak of the direct sound. The Reflected peaks were also compared to the theoretical IRs obtained from Morse’s calculations. The spectrums of the two were compared and can be found on the Figure below.
This project showed that there is some correlation between the experimental and theoretical IRs, suggesting that the sound scatters from the surface of a tree in a similar way to that of a perfectly reflective cylinder. The rounder the trunk, the more similar the spectrum were. Considering that a certain amount of absorption must also be taking place by the surface of the tree, the calculated IRs could be also processed by implementing the effect of the absorption coefficient of a tree. This should make the two spectrums look more similar.
Figure: The frequency spectrum of the Theoretical and Experimental IRs
George Sarantinos 