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Lecture 8 Neuromorphic Hearing 1 Outline • The ear and the cochlea • Silicon Cochlea 2 Ear and Cochlea Cross Section 3 Retina Cells 4 Hair Cells 5 Outline • The ear and the cochlea • Silicon Cochlea 6 Modeling of the filtering operation • The cochlea can be modeled as several 2order filters in parallel. • Each filter is creater cascoding several 2-order low pass filters. • More stability and gain is achieved. • The spatial dependence of the cut-off frequency is modeled with distributed resistors. 7 Resonant low pass filter with transconductance amplifiers (I) 8 Resonant low pass filter with transconductance amplifiers (II) • Second order transfer function: • Generic second order transfer function: 9 Second order filters in parallel Filters are tuned with exponentially increasing time constants 10 Second order filters in cascade 11 A SILICON COCHLEA Richard F. Lyon and Carver Mead, ”An Analog Electronic Cochlea”, IEEE Trans. On Acustics, Speech and Signal Processing, Vol. 36, NO. 7, July 1998. 1000 cascode filters were employed. A real emulation should use 3000. 12