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. Author manuscript; available in PMC: 2010 Feb 20.
Published in final edited form as: J Acoust Soc Am. 2006 Sep;120(3):1474–1492. doi: 10.1121/1.2228539

FIG. 2.

FIG. 2

Characteristics of the parallel roex auditory filter fitted to the combined data of Baker et al. (1998) and Glasberg and Moore (2000) for center frequencies from 0.25 to 6.0 kHz: (a) families of parallel roex filters and (b) their component (tip/tail) filters showing how the functions change with Prxp, the output level of the tail filter; (c) Equivalent rectangular bandwidth, ERB, of the parallel roex filter (solid line) as a function of center frequency on a log-frequency scale. The parameter is the value of Prxp; for a narrow-band signal at the center frequency of the filter this is equivalent to the input level in dB SPL. The dashed line shows the ERBN values proposed by Glasberg and Moore (1990); (d) Input/output functions for the parallel roex filter; the parameter is center frequency. This version of the parallel roex filter had eight coefficients (see Table I).