TAILIEUCHUNG - Journal of Mathematical Neuroscience (2011) 1:5 DOI 10.1186/2190-8567-1-5 RESEARCH Open

Journal of Mathematical Neuroscience (2011) 1:5 DOI RESEARCH Open Access Signal processing in the cochlea: the structure equations Hans Martin Reimann Received: 15 November 2010 / Accepted: 6 June 2011 / Published online: 6 June 2011 © 2011 Reimann; licensee Springer. This is an Open Access article distributed under the terms of the Creative Commons Attribution License Abstract Background: Physical and physiological invariance laws, in particular time invariance and local symmetry, are at the outset of an abstract model. Harmonic analysis and Lie theory are the mathematical prerequisites for its deduction. Results: The main result is a linear system of partial differential equations. | Journal of Mathematical Neuroscience 2011 1 5 DOI 2190-8567-1-5 0 The Journal of Mathematical Neuroscience a SpringerOpen Journal RESEARCH Open Access Signal processing in the cochlea the structure equations Hans Martin Reimann Received 15 November 2010 Accepted 6 June 2011 Published online 6 June 2011 2011 Reimann licensee Springer. This is an Open Access article distributed under the terms of the Creative Commons Attribution License Abstract Background Physical and physiological invariance laws in particular time invariance and local symmetry are at the outset of an abstract model. Harmonic analysis and Lie theory are the mathematical prerequisites for its deduction. Results The main result is a linear system of partial differential equations referred to as the structure equations that describe the result of signal processing in the cochlea. It is formulated for phase and for the logarithm of the amplitude. The changes of these quantities are the essential physiological observables in the description of signal processing in the auditory pathway. Conclusions The structure equations display in a quantitative way the subtle balance for processing information on the basis of phase versus amplitude. From a mathematical point of view the linear system of equations is classified as an inhomogeneous d-equation. In suitable variables the solutions can be represented as the superposition of a particular solution determined by the system and a holomorphic function determined by the incoming signal . In this way a global picture of signal processing in the cochlea emerges. Keywords Signal processing cochlear mechanics wavelet transform uncertainty principle 1 Background At the outset of this work is the quest to understand signal processing in the cochlea. HM Reimann S Institute of Mathematics University of Berne Sidlerstrasse 5 3012 Berne Switzerland e-mail 0 Springer Page 2of54 Reimann Linearity and scaling It has been known since .

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