2. עבוד אותות במערכת החושים סמסטר א' תש"ע http://www.eng.tau.ac.il/~mira/Senses2009 Virtual Lecture 4 http://www.eng.tau.ac.il/~mira/Senses2009

3. Cochlear model’s geometry

4. The Cochlear Model Equations: I. Linear Approximation II. OHC are not Active

5. Frequency Domain Solution

6. Resonance Frequency Resonance Frequency= Characteristic Frequency Resonance Frequency is obtained at the frequency that yields:

7. OHC Anatomy

8. OHC’s model

9. OHC model’s equation

10. Known Facts & Assumptions The outer hair cell motility is proportional to the basolateral membrane voltage drop. The membrane electric analog is a low-pass filter with a cutoff frequency less than 1 kHz. The capacitance changes with the partition motion. The current flow through the basolateral membrane is a function of the partition displacement and velocity.

11. Assumptions

12. OHC Properties: Linear Approximation

13. OHC Force γ(x) - is the relative population of OHCs per unit length

14. OHC Pressure Equation - Substituting the linear approximations in the OHC electrical potential equation yields:

15. The Embedded Cochlear Model

16. Parameters Estimation For and

17. Frequency Domain Equations

18. WKB Approximation A 1 and A 2 are determined by the boundary condition

19. Model’s Simulation

20. Cochlear representations of Chirp Cochlear representation

21. Cochlear representations of “SHEN” Cochlear representation

22. Impaired Hearing

23. Audiograms Sensorineural Hearing Loss CONDUCTIVE HEARING LOSS

24. Simulated Audiograms Estimated Loudness: - For Input Signal: Estimated Hearing Level is defined as: