A Matched Filter Bank for Time Delay Estimation in Bats
Most bats possess a short frequency sweep as a component of their echolocation call, and it is widely accepted in neuroethology that this component is essential for range estimation. Neurons responding with short bursts to frequency sweeps could therefore be involved in range processing (Feng et al., 1978; Suga and O’Neill 1979; Pollak, 1980; Bodenhamer et al., 1979; Vater, 1981; O’Neill and Suga 1982). Many time-marking neurons fire with very little time jitter when a sweep passes through their characteristic frequency. A set of such neurons individually tuned to all frequencies of the fm-sweep make up a filter bank, and neurophysiologists often assume that the time information from this ensemble of filters, suitably averaged, is directly used by bats for time delay estimation.
KeywordsFilter Bank Sweep Rate Inferior Colliculus Timing Error Frequency Sweep
Unable to display preview. Download preview PDF.
- Barton, D.K., Ward, H.R., 1969, Handbook of Radar measurement, Prentice Hall, Englewood Cliffs, N.J.Google Scholar
- Beuter, K.J., 1980, Systemtheoretische Untersuchungen zur Echoortung der Fledermäuse, Thesis, Universität Tübingen.Google Scholar
- Carter, G.C., Knapp, C.H., Nuttall, A.H., 1973, Estimation of the magnitude-squared coherence function via overlapped fast Fourier transform processing, IEEE Trans. Audio Electroacoust. AU-21: 337.Google Scholar
- Hackbarth, H., 1984, Systemtheoretische Interpretation neuerer Verhaltens-und neurophysiologischer Experimente zur Echoorturng der Fledermäuse, Thesis Universität Tübingen, F.R.G.Google Scholar
- O’Neill, W.E., Suga, N., 1982, Encoding of target range and its representation in the auditory cortex of the mustached bat, J. Neuroscience, 2: 17.Google Scholar
- Pollak, G.D., 1980, Organizational and encoding features of single neurons in the inferior colliculus of bats, in: “Animal Sonar Systems”, R.-G. Busnel, J. Fish eds., Plenum Press, New York.Google Scholar
- Schnitzler, H.-U., Menne, D., Hackbarth, H., 1985, Range determination by measuring time delay in echolocating bats, in: “Time resolution in auditory systems,” A. Michelsen, ed., Springer, Berlin.Google Scholar