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Sensors 2007, 7(12), 3287-3298; doi:10.3390/s7123287

From Hearing to Listening: Design and Properties of an Actively Tunable Electronic Hearing Sensor

* , ,  and
Institute of Neuroinformatics University/ETH Zurich, Winterthurerstr. 190, 8057 Zurich Switzerland
* Author to whom correspondence should be addressed.
Received: 5 December 2007 / Accepted: 13 December 2007 / Published: 14 December 2007
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Switzerland)
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An important step towards understanding the working principles of the mammalian hearing sensor is the concept of an active cochlear amplifier. Theoretical arguments and physiological measurements suggest that the active cochlear amplifiers originate from systems close to a Hopf bifurcation. Efforts to model the mammalian hearing sensor on these grounds have, however, either had problems in reproducing sufficiently close essential aspects of the biological example (Magnasco, M.O. Phys. Rev. Lett. 90, 058101 (2003); Duke, T. & Jülicher, F. Phys. Rev. Lett. 90, 158101 (2003)), or required complicated spatially coupled differential equation systems that are unfeasible for transient signals (Kern, A. & Stoop, R. Phys. Rev. Lett. 91, 128101 (2003)). Here, we demonstrate a simple system of electronically coupled Hopf amplifiers that not only leads to the desired biological response behavior, but also has real-time capacity. The obtained electronic Hopf cochlea shares all salient signal processing features exhibited by the mammalian cochlea and thus provides a simple and efficient design of an artificial mammalian hearing sensor.
Keywords: Cochlea; hearing sensor; electronics. Cochlea; hearing sensor; electronics.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Stoop, R.; Jasa, T.; Uwate, Y.; Martignoli, S. From Hearing to Listening: Design and Properties of an Actively Tunable Electronic Hearing Sensor. Sensors 2007, 7, 3287-3298.

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