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Lecture 8

Lecture 8. Neuromorphic Hearing. Outline. The ear and the cochlea Silicon Cochlea. Ear and Cochlea Cross Section. Retina Cells. Hair Cells. Outline. The ear and the cochlea Silicon Cochlea. Modeling of the filtering operation.

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Lecture 8

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  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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