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Energy Efficiency is Not Enough: Towards a Batteryless Internet of Sounds

Vincent Lostanlen 1, 2, 3, 4 Antoine Bernabeu 1, 2, 3, 5 Jean-Luc Béchennec 1, 2, 3, 5 Mikaël Briday 1, 2, 3, 5 Sébastien Faucou 1, 2, 3, 5 Mathieu Lagrange 1, 2, 3, 4 
Abstract : This position paper advocates for digital sobriety in the design and usage of wireless acoustic sensors. As of today, these devices all rely on batteries, which are either recharged by a human operator or via solar panels. Yet, batteries contain chemical pollutants and have a shorter lifespan than electronic components: as such, they hinder the autonomy and sustainability of the Internet of Sounds at large. Against this problem, our radical answer is to avoid the use of batteries altogether; and instead, to harvest ambient energy in real time and store it in a supercapacitor allowing a few minutes of operation. We show the inherent limitations of battery-dependent technologies for acoustic sensing. Then, we describe how a lowcost Micro-Controller Unit (MCU) could serve for audio acquisition and feature extraction on the edge. In particular, we stress the advantage of storing intermediate computations in ferroelectric random-access memory (FeRAM), which is nonvolatile, fast, endurant and consumes little. As a proof of concept, we present a simple-minded detector of sine tones in background noise, which relies on a fixed-point implementation of the fast Fourier transform (FFT). We outline future directions towards bioacoustic event detection and urban acoustic monitoring without batteries nor wires. CCS CONCEPTS • Hardware → Sound-based input / output; Digital signal processing; Power estimation and optimization; Impact on the environment; • Computer systems organization → Real-time systems; • Networks → Sensor networks.
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https://hal.archives-ouvertes.fr/hal-03324622
Contributor : Vincent Lostanlen Connect in order to contact the contributor
Submitted on : Monday, August 23, 2021 - 5:29:59 PM
Last modification on : Thursday, December 1, 2022 - 11:16:07 AM
Long-term archiving on: : Wednesday, November 24, 2021 - 7:07:28 PM

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Distributed under a Creative Commons Attribution 4.0 International License

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  • HAL Id : hal-03324622, version 1

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Vincent Lostanlen, Antoine Bernabeu, Jean-Luc Béchennec, Mikaël Briday, Sébastien Faucou, et al.. Energy Efficiency is Not Enough: Towards a Batteryless Internet of Sounds. Proceedings of the International Workshop on the Internet of Sounds (IWIS), Audio Mostly, Sep 2021, Trento, Italy. ⟨hal-03324622⟩

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