Research Article

Spectral Biomimetic Technique for Wood Classification Inspired by Human Echolocation

Figure 6

Frequency spectra of echoes from synthetic pulses from different wood veneers.
378361.fig.006a
(a) Synthetic echo spectrum of a chestnut veneer from a distance of 20 cm
378361.fig.006b
(b) Synthetic echo spectrum of a cherry veneer from a distance of 20 cm
378361.fig.006c
(c) Synthetic echo spectrum of a maple veneer from a distance of 20 cm