Spectral Biomimetic Technique for Wood Classification Inspired by Human Echolocation

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="378361.fig.008a" src="https://static.hindawi.com/articles/aav/volume-2012/378361/figures/378361.fig.008a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Natural palatal click echo spectrum of a chestnut veneer from a distance of 20 cm</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="378361.fig.008b" src="https://static.hindawi.com/articles/aav/volume-2012/378361/figures/378361.fig.008b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>Natural palatal click echo spectrum of a cherry veneer from a distance of 20 cm</td></tr></table></td></tr><tr class="fig-image" id="c"><td><img alt="378361.fig.008c" src="https://static.hindawi.com/articles/aav/volume-2012/378361/figures/378361.fig.008c.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(c) </b>Natural palatal click echo spectrum of a maple veneer from a distance of 20 cm</td></tr></table></td></tr></table>

<table>Frequency spectra of echoes from natural palatal clicks from different wood veneers.</table>

Advances in Acoustics and Vibration

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Figure 8

Figure 8: Spectral Biomimetic Technique for Wood Classification Inspired by Human Echolocation 