Design of an Analogue VLSI Model of an Active Cochlea

Authors:
Eric Fragnière;André van Schaik;Eric A. Vittoz
Affiliations:
MANTRA Centre for Neuromimetic Systems, Department of Computer Science, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland;MANTRA Centre for Neuromimetic Systems, Department of Computer Science, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland;CSEM, Centre Suisse d'Electronique et de Microtechnique S.A., Jaquet-Droz 1, CH-2007 Neuchatel, Switzerland
Venue:
Analog Integrated Circuits and Signal Processing
Year:
1997

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Abstract

A model of an active cochlea featuring a frequency selectivegain adaptation is proposed. The model is developed for analogueVLSI implementation and is based on the original ’’analog electroniccochlea‘‘ proposed by Lyon and Mead (1988) which consists ofa second-order lowpass filter cascade. At any position alongthe cochlea, the gain is locally controlled by the output levelat this position through the quality factor of the second-orderlowpass filter which best participates to this local gain. Inorder to achieve a 40dB compression with a limited local qualityfactor, the pseudoresonance of the cascade is used. A carefulanalysis of the functional model, supported by realistic computersimulations, shows the validity of the model by comparison withits biological counterpart. All the building blocks for an analogueVLSI implementation are proposed, taking into account the majortechnological limitations of a standard CMOS process.