Cascades of two-pole–two-zero asymmetric resonators are good models of peripheral auditory function
Venue
Journal of the Acoustical Society of America, vol. 130 (2011), pp. 3893-3904
Publication Year
2011
Authors
BibTeX
Abstract
A cascade of two-pole–two-zero filter stages is a good model of the auditory
periphery in two distinct ways. First, in the form of the pole–zero filter cascade,
it acts as an auditory filter model that provides an excellent fit to data on human
detection of tones in masking noise, with fewer fitting parameters than previously
reported filter models such as the roex and gammachirp models. Second, when
extended to the form of the cascade of asymmetric resonators with fast-acting
compression, it serves as an efficient front-end filterbank for machine-hearing
applications, including dynamic nonlinear effects such as fast wide-dynamic-range
compression. In their underlying linear approximations, these filters are described
by their poles and zeros, that is, by rational transfer functions, which makes them
simple to implement in analog or digital domains. Other advantages in these models
derive from the close connection of the filter-cascade architecture to wave
propagation in the cochlea. These models also reflect the automatic-gain-control
function of the auditory system and can maintain approximately constant
impulse-response zero-crossing times as the level-dependent parameters change.
Copyright (2011) Acoustical Society of America. This article may be downloaded
for personal use only. Any other use requires prior permission of the author and
the Acoustical Society of America. The article appeared in J. Acoust. Soc. Am. vol.
130 and may be found via http://asadl.org/jasa/resource/1/jasman/v130/i6/p3893_s1.
