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Event-based 64-channel binaural silicon cochlea with Q enhancement mechanisms


Liu, S C; van Schaik, A; Minch, B A; Delbruck, T (2010). Event-based 64-channel binaural silicon cochlea with Q enhancement mechanisms. In: Circuits and Systems (ISCAS), Proceedings of 2010 IEEE International Symposium, Paris, France, 30 May 2010 - 2 June 2010, 2027-2030.

Abstract

This paper describes an event-based binaural silicon cochlea aimed at spatial audition and auditory scene analysis. The chip has a matched pair of 64-stage cascaded analog second-order filter banks with 512 pulse-frequency modulated (PFM) address-event representation (AER) outputs. The spectral selectivity is sharpened through 2 different on-chip methods: an on-chip local Q DAC and an on-chip spatial sharpening through nearest neighbour lateral inhibition. The fabricated chip in a 4-metal 2-poly 0.35um CMOS process consumes peak 25mW power for the digital circuits and 33mW for the analog core. Dynamic range to produce PFM output is 36dB (25mVpp to 1500mVpp at microphone preamp output). Event timing jitter is 2us for 250mVpp input. The peak output bandwidth is 10M events per second (eps) but typical speech scenarios show rates of 20keps.

Abstract

This paper describes an event-based binaural silicon cochlea aimed at spatial audition and auditory scene analysis. The chip has a matched pair of 64-stage cascaded analog second-order filter banks with 512 pulse-frequency modulated (PFM) address-event representation (AER) outputs. The spectral selectivity is sharpened through 2 different on-chip methods: an on-chip local Q DAC and an on-chip spatial sharpening through nearest neighbour lateral inhibition. The fabricated chip in a 4-metal 2-poly 0.35um CMOS process consumes peak 25mW power for the digital circuits and 33mW for the analog core. Dynamic range to produce PFM output is 36dB (25mVpp to 1500mVpp at microphone preamp output). Event timing jitter is 2us for 250mVpp input. The peak output bandwidth is 10M events per second (eps) but typical speech scenarios show rates of 20keps.

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Additional indexing

Item Type:Conference or Workshop Item (Paper), refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Neuroinformatics
Dewey Decimal Classification:570 Life sciences; biology
Language:English
Event End Date:2 June 2010
Deposited On:02 Mar 2011 14:51
Last Modified:21 Nov 2017 15:20
Publisher:IEEE
Number of Pages:3
ISBN:978-1-4244-5308-5
Publisher DOI:https://doi.org/10.1109/ISCAS.2010.5537164

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