Spectral Biomimetic Technique for Wood Classification Inspired by Human Echolocation

Table 3

Summary of acoustic parameters of natural pulses from three different wood species.

Wood	Acoustic parameters (mean ± standard deviation)
	𝑇 (ms)	𝑁Max	MaxWA (n.u.)	MinWA (n.u.)
Chestnut	20.47±0.83	22.8±0.8	0.074±0.018	0.094±0.018
Cherry	18.92±0.72	20.0±1.9	0.050±0.020	0.052±0.015
Maple	17.08±0.46	35.8±0.8	0.080±0.040	0.102±0.053

𝑇: time duration; 𝑁Max: number of maxima; MaxWA: maximum wave amplitude (normalized units); MinWA: minimum wave amplitude (normalized units).