1. Seneff’s Auditory Model Miriam Cordero Ruiz (SONY Advanced Technology Center Stuttgart) Leuven, july 2002

2. Which is the best speech recognizer?

3. Introduction Auditory System Seneff’s Model Stage I Stage II Conclusions

4. Human Auditory System

7. t t Inner Hair Cells

8. Structure of the model CRITICAL BAND FILTER BANK HAIR CELL SYNAPSE MODEL ENVELOPE DETECTOR SYNCHRONY DETECTOR Mean rate spectrum synchrony spectrum STAGE I STAGE II STAGE III

9. Stage I: Auditory Filter Bank 40 channels (20 - 6700 Hz) BW 1channel =0,5 Barks

10. Design of the Auditory Filter Bank INITIAL COMPLEX ZEROES ZERO OF CASCADE RESONATOR CHANNEL 1CHANNEL 2CHANNEL 40 ……. f(Hz)

11. Stage II Physiological Data Model < 1kHz

12. Stages I+II CRITICAL BAND FILTER BANK HALFWAVE RECTIFICATION SHORT-TERM ADAPTATION LOW PASS FILTER RAPID AGC STAGE II STAGE I

13. Results

14. Other Peripheral Models Patterson-Meddis Gammatone Filterbank Lyon’s Cochlear Model Gammatone Filterbank Adaptation Stage

15. Conclusions Based on biological data Front-End for Speech Processing Speech Recognition, Speaker ID, Localization…. Better performance