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Passive Extraction of Signal Feature Using a Rectifier with a Mechanically Switched Inductor for Low Power Acoustic Event Detection.

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Updated: Nov 10, 2025

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Low-Power Sensor Interface with a Switched Inductor Frequency Selective Envelope Detector.

Marko Gazivoda1, Vedran Bilas1

  • 1Faculty of Electrical Engineering and Computing, University of Zagreb, 10000 Zagreb, Croatia.

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|April 3, 2021
PubMed
Summary

This study introduces a novel, low-power acoustic sensor interface for the Internet of Things (IoT). The developed switched inductor circuit offers efficient signal detection with minimal power consumption, crucial for continuous environmental monitoring.

Keywords:
event detection applicationsensor signal conditioning circuitswitched inductor filterweak signal detection

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Acoustic Signal Processing

Background:

  • The Internet of Things (IoT) requires low-power sensors for continuous monitoring.
  • Advancements in sensor manufacturing necessitate efficient interface designs.
  • Acoustic sensing is vital for environmental understanding and event detection.

Purpose of the Study:

  • To present a novel switched inductor-based acoustic sensor interface.
  • To analyze the sensitivity, frequency selectivity, and power consumption of the interface.
  • To compare the prototype's performance against existing interface designs.

Main Methods:

  • Design and development of a switched inductor-based acoustic sensor interface with a bandpass filter and envelope detector.
  • Experimental characterization of the prototype's sensitivity, frequency selectivity, and power consumption.
  • Comparative analysis using a prerecorded speedboat signal against an active filter and passive voltage doubler interface.

Main Results:

  • The prototype achieved a sensitivity of approximately 2 mV/mV in the passband and significantly lower sensitivity in the stopband.
  • Power consumption was measured at approximately 3.31 µW, demonstrating low-power operation.
  • The novel interface showed comparable or improved performance against the traditional interface.

Conclusions:

  • The developed switched inductor acoustic sensor interface is a viable low-power solution for IoT applications.
  • The circuit design parameters effectively influence its performance characteristics.
  • This technology enables efficient acoustic event detection for enhanced environmental monitoring.