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Re: regarding bat's vocalizaion and its signal structure
On 1 Jul 2005, at 07:42, J. Gwan Lim wrote:
Recently I've read Schnitzler's paper titled ' Echolocation by
insect-eating bats' and it was so amusing. He tried to map bat's
structure into typical echolocation task and distinct functional
He said, narrow band signals is good for target classification and
band for target localization.
A lot of this analysis parallels engineering work on radar detection
and tracking in clutter. The broad band signals tend to be doppler-
tolerant, so they give a good localization that is insensitive to
relative velocity. In the big brown bat, the search signals have a
significant continuous-wave (narrow band) tail, which can pick out
moving targets in background clutter. Long-range acquisition and
tracking signals seem to be doppler-tolerant. These bats appear to
use bursts of signals for accurate localization at medium to short
range, and 'terminal buzzes' to classify targets at medium range and
control approach to targets at short range. I'm looking at neural
mechanisms for representing location and velocity, and I strongly
suspect the bursts and buzzes are used to measure relative target
velocity directly as it is unlikely that the CNS possesses mechanisms
for doing vector arithmetic.
After reading it, I am wondering if there is any paper to specify and
analyze the reason the above statements about correlation between
frequency band and its functional task. Could you recommend any
Griffin, D. R. (1958). Listening in the Dark. Ithaca, New York,
Comstock Publishing Associates.
Popper, A. N. and R. R. Fay, Eds. (1995). Hearing by Bats. Springer
Handbook of Auditory Research. New York, New York, Springer-Verlag.
Altes, R. A. (1995). "Signal Processing for Target Recognition in
Biosonar." Neural Networks 8(7/8): 1275-1295.
Kalko, E. K. V. and H.-U. Schnitzler (1998). How Echolocating Bats
Approach and Acquire Food. Bat Biology and Conservation. T. H. Kunz
and P. A. Racey. Washington and London, Smithsonian Institution
Müller, R. and R. Kuc (2000). "Foliage Echoes: A Probe into the
Ecological Acoustics of Bat Echolocation." Journal of the Acoustical
Society of America 108(2): 836-845.
Nachtigall, P. E. and P. W. Moore, Eds. (1988). Animal Sonar:
Processes and Performance, Plenum Press.
Harry Erwin, PhD, Senior Lecturer of Computing, University of
Sunderland. Computational neuroscientist modeling bat bioacoustics
and behavior. http://osiris.sunderland.ac.uk/~cs0her