History and Future of Auditory Filter Models
Venue
Proc. ISCAS, IEEE (2010), pp. 3809-3812
Publication Year
2010
Authors
Richard F. Lyon, Andreas G. Katsiamis, Emmanuel M. Drakakis
BibTeX
Abstract
Auditory filter models have a history of over a hundred years, with explicit
bio-mimetic inspiration at many stages along the way. From passive analogue
electric delay line models, through digital filter models, active analogue VLSI
models, and abstract filter shape models, these filters have both represented and
driven the state of progress in auditory research. Today, we are able to represent
a wide range of linear and nonlinear aspects of the psychophysics and physiology of
hearing with a rather simple and elegant set of circuits or computations that have
a clear connection to underlying hydrodynamics and with parameters calibrated to
human performance data. A key part of the progress in getting to this stage has
been the experimental clarification of the nature of cochlear nonlinearities, and
the modelling work to map these experimental results into the domain of circuits
and systems. No matter how these models are built into machine-hearing systems,
their bio-mimetic roots will remain key to their performance. In this paper we
review some of these models, explain their advantages and disadvantages and present
possible ways of implementing them. As an example, a continuous-time analogue CMOS
implementation of the One Zero Gammatone Filter (OZGF) is presented together with
its automatic gain control that models its level-dependent nonlinear behaviour.
