Source level reduction and sonar beam aiming in landing big brown bats 
(Eptesicus fuscus)

Koblitz, Jens C.; Stilz, P.; Pflasterer, W.; Melcon, M. L.; Schnitzler, H. U.

doi:10.1121/1.3628345

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Source level reduction and sonar beam aiming in landing big brown bats (Eptesicus fuscus)

MPS-Authors

There are no MPG-Authors in the publication available

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Koblitz, J. C., Stilz, P., Pflasterer, W., Melcon, M. L., & Schnitzler, H. U. (2011). Source level reduction and sonar beam aiming in landing big brown bats (Eptesicus fuscus). The Journal of the Acoustical Society of America, 130(5), 3090-3099. doi:10.1121/1.3628345.

Cite as: https://hdl.handle.net/21.11116/0000-0005-A511-D

Abstract

Reduction of echolocation call source levels in bats has previously been studied using set-ups with one microphone. By using a 16 microphone array, sound pressure level (SPL) variations, possibly caused by the scanning movements of the bat, can be excluded and the sonar beam aiming can be studied. During the last two meters of approach flights to a landing platform in a large flight room, five big brown bats aimed sonar beams at the landing site and reduced the source level on average by 7 dB per halving of distance. Considerable variation was found among the five individuals in the amount of source level reduction ranging from 4 to 9 dB per halving of distance. These results are discussed with respect to automatic gain control and intensity compensation and the combination of the two effects. It is argued that the two effects together do not lead to a stable echo level at the cochlea. This excludes a tightly coupled closed loop feed back control system as an explanation for the observed reduction of signal SPL in landing big brown bats. (C) 2011 Acoustical Society of America. [DOI: 10.1121/1.3628345]