Pattern-matching analysis of fine echo delays by the spectrogram correlation and transformation receiver

Park, Munhum and Allen, Robert (2010) Pattern-matching analysis of fine echo delays by the spectrogram correlation and transformation receiver. Journal of the Acoustical Society of America, 128 (3), 1490-1500. (doi:10.1121/1.3466844).

Record type: Article

Abstract

Among a few previous attempts to model the outstanding echolocation capability of bats, the work
by Saillant et al. J. Acoust. Soc. Am. 94, 2691–2712 1993 is, arguably, one of the most
frequently referenced studies in which the predictions of spectrogram correlation and transformation
SCAT model were compared to the results of relevant behavioral experiments. The SCAT model
consists of cochlear, spectrogram correlation and spectrogram transformation blocks, where the
latter two processes estimate the overall and the fine time delays between the animal’s call and the
echoes, given the neural representation of the acoustic signals generated by the cochlear block. This
paper first provides a rigorous account of the spectrogram transformation ST block. By
approximating the neural signals in analytic forms, many aspects of the ST block are explained and
discussed in relation to the predictive scope of the model. Furthermore, based on these analytical
arguments, the ST block is investigated from a different point of view, interpreted as a
pattern-matching process which may operate at the high level of the animal’s auditory pathway.

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