Loud direct arrivals must be windowed out before fitting a decay model.

Evidence

This windowing is necessary, as the amplitude of the initial arrival is very large compared to the reverberative signal that follows. The first term on the right-hand side of Eq. (1) represents the decay, while the second term represents the noise component of the signal, Table III shows the results of this method for each of the forest sites investigated. — Donald G. Albert, Michelle E. Swearingen, Frank E. Perron, and David L. Carbee, Low Frequency Acoustic Pulse…, 86

Categorization

• SHARE: A tidy signal-processing point worth sending to anyone doing field acoustics or impulse-response measurements.