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Asynchronous binaural spatial audition sensor with 2 × 64 × 4 channel output.

Shih-Chii Liu, Andre van Schaik, Bradley A Minch

    IEEE Transactions on Biomedical Circuits and Systems
    |November 13, 2013
    PubMed
    Summary
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    This study introduces an event-based silicon cochlea for efficient spatial audition. This novel system significantly reduces computational costs for auditory applications like source localization.

    Area of Science:

    • Neuroscience and Bioengineering
    • Neuromorphic Engineering
    • Signal Processing

    Background:

    • Auditory scene analysis and spatial audition are crucial for human perception.
    • Conventional signal processing methods for auditory tasks can be computationally intensive.

    Purpose of the Study:

    • To propose an integrated event-based binaural silicon cochlea system.
    • To achieve efficient spatial audition and auditory scene analysis.
    • To demonstrate reduced computational cost for source localization.

    Main Methods:

    • Development of a silicon cochlea chip with digitally-calibrated analog filter banks.
    • Utilizing 64-stage cascaded second-order filter banks and 512 pulse-frequency modulated (PFM) address-event representation (AER) outputs.

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  • Individual channel quality factor adjustment via local DACs on a 0.35 um CMOS chip.

    • Main Results:

    • The chip achieves an average power consumption of 14 mW, including preamplifiers and biasing.
    • Operates at typical speech data rates of 10k-100k events per second (eps), with peak rates of 10 Meps.
    • Demonstrates up to a 40x reduction in computational cost for event-driven source localization compared to cross-correlation methods.

    Conclusions:

    • The proposed event-based binaural silicon cochlea enables efficient spatial audition and auditory scene analysis.
    • The system offers significant power and computational advantages for auditory processing applications.
    • This technology paves the way for more efficient neuromorphic auditory systems.