Third-Order Spectral Characterization of Termite’s Emission Track
A higher-order frequency-domain characterization of termite activity (feeding and excavating) has been performed by means of analyzing diagonal slices of the bi-spectrum. Five sets of signals of different qualities were acquired using a high sensitivity probe-accelerometer. We conclude that it is possible to establish a third-order pattern (spectral track) associated to the termite emissions, and resulting from the impulsive response of the sensor and the body or substratum through which the emitted waves propagate.
KeywordsRoot Mean Square Wavelet Packet Independent Component Analysis Average Power Spectrum Termite Activity
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