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Understanding the Silicon Cochlea: A Neuromorphic Approach to Hearing

This lecture explores the intricacies of the ear and cochlea, emphasizing the modeling of cochlear functionality through neuromorphic engineering. We delve into the architecture of silicon cochlea, employing second-order filters that mimic natural hearing processes. The lecture outlines how cascaded low-pass filters can achieve greater stability and gain, while spatial dependence in cutoff frequency is modeled using distributed resistors. Furthermore, we discuss the implementation of resonant low-pass filters with transconductance amplifiers, drawing insights from Richard F. Lyon and Carver Mead's work in analog electronic cochlea.

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Understanding the Silicon Cochlea: A Neuromorphic Approach to Hearing

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Presentation Transcript

  1. Lecture 8 NeuromorphicHearing

  2. Outline • The ear and thecochlea • Silicon Cochlea

  3. Ear and Cochlea Cross Section

  4. Retina Cells

  5. HairCells

  6. Outline • The ear and thecochlea • Silicon Cochlea

  7. Modelingofthefilteringoperation • The cochlea can be modeledwithseveral 2-order filters. • Each filter is creatercascodingseveral 2-order low pass filters. • More stability and gain is achieved. • The spatial dependenceofthecut-offfrequency is modeledwithdistributedresistors.

  8. Resonantlow pass filter withtransconductanceamplifiers (I)

  9. Resonantlow pass filter withtransconductanceamplifiers (II) • Second order transfer function: • Genericsecond order transfer function:

  10. Second order filters in parallel Filters aretunedwithexponentiallyincreasing time constants

  11. Second order filters in cascade

  12. System Implementation

  13. 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 wereemployed. A real emulationshoulduse 3000.

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