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
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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