Forest cover shifts impulsive sound energy to lower peak frequencies than grass

Evidence

Figure 4 shows the power spectral densities calculated for the waveforms shown in Fig. 3. The top panel of the figure shows that the direct wave pulse has a (30 dB) bandwidth of about 120-420 Hz with a peak frequency of 180 Hz when measured over grass. For the measurement in the forest, the peak frequency is lower, 95 Hz, and the direct wave pulse FIG. — Donald G. Albert, Michelle E. Swearingen, Frank E. Perron, and David L. Carbee, Low Frequency Acoustic Pulse…, 59

Categorization

• SHARE: A narrow, quantified acoustic-ecology detail — the kind of thing one specific person into field recording or forest acoustics would want.