Control of doppler shift compensation in the greater horseshoe bat,Rhinolophus ferrumequinum
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FlyingRhinolophus ferrumequinum lower the frequency of the constant frequency part (f A ) of the emitted sounds in order to compensate for Doppler shifts caused by the flight speed. The echo frequency (f E ) is kept constant within a frequency band of about 200 Hz, the center frequency of which is about 150 Hz above the average or resting frequency (f R ) emitted by roosting bats shortly before take off. For the compensation they use a feedback control system in which the emission frequency is changed to hold the echo frequency at a criterion value. This feedback system was demonstrated by experiments with bats flying in an experimental wind tunnel and in a He-O2-micture. In the wind tunnelRhinolophus lowers the emission frequency in order to compensate for Doppler shifts which are caused by the ground speed flown by the bat. In the He-O2-mixtureRhinolophus compensates for Doppler shifts which correspond to the different sound speeds in the gas mixture.
Journal of comparative physiology, Vol. 82, no. 1 (1973-03).
Frequency Band, Feedback Control, Wind Tunnel, Center Frequency, Doppler Shift
Frequency Band; Feedback Control; Wind Tunnel; Center Frequency; Doppler Shift
Schnitzler, Hans-Ulrich, "Control of doppler shift compensation in the greater horseshoe bat,Rhinolophus ferrumequinum" (1973). KIP Articles. 1215.