In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 126, No. 4_Supplement ( 2009-10-01), p. 2271-2271
Abstract:
Echolocating bats emit short high-frequency calls and use returning echoes to determine direction, distance, and features of objects in the environment. Thus, echolocation is an active orientation system allowing bats to operate with little or no light. In open areas in the wild, bats emit very high intensity search calls of high directionality to increase the range of the sonar. In cluttered habitats (or the laboratory) not only the prey but also vegetation and other obstacles will reflect a fusion of many echoes for each emitted echolocation call. In cluttered habitats, the intensity is lower and the beam is wider to shorten and broaden the angle of view, while the beam axis is still focused very accurately on the target. Thus, by adjusting intensity, directionality, and beam aim of their calls, bats can actively filter and control the “sound-picture” of their surroundings that they perceive through echolocation.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
2009
detail.hit.zdb_id:
1461063-2
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