Improvement of an 2R asymmetric compensation gammachirp filter

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  • Unoki Masashi
    ATR Human Information Processing Research Laboratories, 2–2 Hikaridai, Seika-cho, Soraku-gun, Kyoto, 619–0288 Japan Japan Advanced Institute of Science and Technology, 1–1 Asahidai, Tatsunokuchi-machi, Nomi-gun, Ishikawa, 923–1292 Japan Currently with CNBH, Department of Physiology, University of Cambridge
  • Irino Toshio
    ATR Human Information Processing Research Laboratories, 2–2 Hikaridai, Seika-cho, Soraku-gun, Kyoto, 619–0288 Japan CREST, Japan Science and Technology Corporation Currently with NTT Communication Science Laboratories
  • Patterson Roy D.
    CNBH, Department of Physiology, University of Cambridge, Downing Street, Cambridge, CB2 3EG United Kingdom

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タイトル別名
  • Improvement of an IIR asymmetric compensation gammachirp filter.

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説明

An IIR implementation of the gammachirp filter has been proposed to simulate basilar membrane motion efficiently (Irino and Unoki, 1999). A reasonable filter response was provided by a combination of a gammatone filter and an IIR asymmetric compensation (AC) filter. It was noted, probably however, that the rms error was high when the absolute values of the parameters are large, because the coefficients of the IIR-AC filter were selected heuristically. In this report, we show that this is due to the sign inversion of the phase of poles and zeros in the conventional model. We propose a new definition of the IIR-AC filter and we describe a method of systematic determining the optimum coefficients and number of cascade for the second-order filter. This results in a reduction of the error to about 1/3 that produced by the conventional model.

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