title: Pulse-echo interaction in free-flying horseshoe bats, Rhinolophus ferrumequinum nippon.
abstract: Because horseshoe bats emit a long-duration pulse, the returning echo temporally overlaps with the emitted pulse during echolocation. Here, the pulse-echo interaction that horseshoe bats actually experience during flight was examined using onboard telemetry sound recordings. Doppler-shifted returning echoes produced beats in the amplitude patterns of constant-frequency components. Bats shortened the pulse duration with target distance, but the overlap duration was at least 8 ms within the approach phase. The computations suggest that the phase difference in slowly amplitude-modulated sound (the beat signal) provides a useful cue for target localization.
authors.affiliation: Faculty of Engineering, Doshisha University, Kyotanabe, Japan. yu.shiori@jp.sony.com
authors.forename: Yu
authors.initials: Y
authors.lastname: Shiori
authors.forename: Shizuko
authors.initials: S
authors.lastname: Hiryu
authors.forename: Yu
authors.initials: Y
authors.lastname: Watanabe
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Riquimaroux
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Watanabe
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D002685:Chiroptera / Q000502:physiology*; D004455:Echolocation; D005426:Flight, Animal; D008297:Male; D013018:Sound Spectrography; D013037:Spatial Behavior; D013686:Telemetry; D013997:Time Factors