Some problems of analyzing bio-sonar echolocation signals generated by echolocating animals living in the water and in the air

Abstract

In this paper some similarities and differences of bio-sonar echolocation signals generated in the water and in the air are presented. The echolocation cues of marine mammals and bats are usually frequency and amplitude signals modulated simultaneously. The main problems of the analysis of such type of signals are envelope detecting and time-frequency decomposition. In this paper some digital signal processing (DSP) algorithms that may be used to analyze this type of signals are presented. The basic linear spectrogram (STFS), the nonlinear Winger-Vill'e spectrogram and some time-scale representations of signals using wavelets methods of estimation of the frequency modulation function have been compared. An analysis of possibilities for acoustic identification of particular species of bats by means of echolocation is also presented.

A Preliminary Analysis of Wireless Link for Bats Signals Acquisition System

“…species). The properties of particular detection systems and their effect on the quality of the tested signal have been covered by a number of works [1][2][3][4][5]. It is, however, notable that all such devices have to be controlled by an operator.…”