A VLSI-Based Model of Azimuthal Echolocation in the Big Brown Bat

Authors:
Timothy Horiuchi;Kai M. Hynna
Affiliations:
Electrical and Computer Engineering Department, and the Institute for Systems Research, A.V. Williams Bldg., University of Maryland, College Park, MD 20742, USA;Department of Bioengineering, 120 Hayden Hall, 3320 Smith Walk, University of Pennsylvania, Philadelphia, PA 19104, USA
Venue:
Autonomous Robots
Year:
2001

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Abstract

The azimuthal localization of objects by echolocating bats is based on the difference of echo intensity received at the two ears, known as the interaural level difference (ILD). Mimicking the neural computation of ILD in bats, we have constructed a spike-based VLSI model of the lateral superior olive (LSO) that can successfully produce direction-dependent responses. This simple algorithm, while studied in the acoustic domain, is applicable to any localization based on direction-dependent signal attenuation differences.