Interfacing PDM sensors with PFM spiking systems: application for Neuromorphic Auditory Sensors release_umqwprvhwjeopb3llvoitixwae

by Angel Jimenez-Fernandez, Juan Pedro Dominguez-Morales, Daniel Gutierrez-Galan, Antonio Rios-Navarro, Ricardo Tapiador-Morales, Alejandro Linares-Barranco

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2019  

Abstract

In this paper we present a sub-system to convert audio information from low-power MEMS microphones with pulse density modulation (PDM) output into rate coded spike streams. These spikes represent the input signal of a Neuromorphic Auditory Sensor (NAS), which is implemented with Spike Signal Processing (SSP) building blocks. For this conversion, we have designed a HDL component for FPGA able to interface with PDM microphones and converts their pulses to temporal distributed spikes following a pulse frequency modulation (PFM) scheme with an accurate configurable Inter-Spike-Interval. The new FPGA component has been tested in two scenarios, first as a stand-alone circuit for its characterization, and then it has been integrated with a full NAS design to verify its behavior. This PDM interface demands less than 1% of a Spartan 6 FPGA resources and has a power consumption below 5mW.
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Date   2019-04-30
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arXiv  1905.00390v1
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