Energy spectrum analysis: A model of echolocation processing

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Abstract
Previous analyses of echolocation [in animals such as Rousettus sp. and Tursiops truncatus] suggested that correlation-equivalent processing might be used in certain cases. A frequency domain approach based on energy spectrum analysis of the signal and its echoes combined was proposed as the processing mechanism for echolocation. It was a generalized wide-band mechanism and could account for the large diversity of wide-band signals known to be used for orientation. Neurobiological investigations neither confirmed nor denied any specific kind of correlation equivalent processing, but this proposal offered the 1st frequency domain correlation-equivalent possibility. A review of time separation pitch revealed that an identical analysis was used to explain that phenomenon. Extensions of the model can explain many of the phenomena observed in echolocation.

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