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Effectiveness of time-varying echo information for target geometry identification in bat-inspired human echolocation

Fig 4

Experimental system.

This figure shows the top and side views of the experimental system. Once the participants tap Android devices A and B in chamber 1, the synthetic echolocation signal is emitted from the loudspeaker to the target (target 1 or 2) in chamber 2. The emitted signal and its echoes from the target are then recorded using the 1/7-scaled MDH on the loudspeaker. The recorded binaural sounds, whose pitch is converted to 1/8 of the original, are presented to the participants through the headphones in chamber 1. Then the participants identify the target geometries by listening to the pitch-converted binaural sounds by pressing the keys of the notebook computer in chamber 1. Two experimental conditions are employed, namely, rotating (i.e., the target is rotating horizontally on an electric turntable) and stationary (i.e., the target remains stationary on the electric turntable). The red arrow in the top view indicates the direction of the rotation of the target.

Fig 4

doi: https://doi.org/10.1371/journal.pone.0250517.g004