Tunable Planar Acoustic Notch Filter Utilizing Pneumatic Deforming Helmholtz Resonator Array

Fumiya Mizukoshi, Hidetoshi Takahashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper reports a tunable acoustic notch filter utilizing a Helmholtz resonator (HR) array. Passive acoustic filters based on mechanical resonators have the advantages of no power supply requirement; however, the filtering frequency is not adjustable compared to active noise control. The proposed device consists of three-layered parts: cavities, a membrane, and microchannels. The cavities work as HR chambers, which determine the resonant frequency. Due to the HR effect, the acoustic wave is effectively insulated at the frequency. The HR chamber volume can be changed by deforming the membrane with air pressure through the microchannels. Thus, it enables adjustment of the resonant frequency, realizing a tunable acoustic notch filter. The prototype device realized the frequency tuning approximately from 4 to 5 kHz with 10 dB filtering. Thus, it can handle a wide range of high-frequency noises that humans tend to find uncomfortable.

Original languageEnglish
Title of host publication35th IEEE International Conference on Micro Electro Mechanical Systems Conference, MEMS 2022
PublisherIEEE Computer Society
Pages849-851
Number of pages3
ISBN (Electronic)9781665409117
DOIs
Publication statusPublished - 2022
Event35th IEEE International Conference on Micro Electro Mechanical Systems Conference, MEMS 2022 - Tokyo, Japan
Duration: 2022 Jan 92022 Jan 13

Publication series

NameIEEE Symposium on Mass Storage Systems and Technologies
Volume2022-January
ISSN (Print)2160-1968

Conference

Conference35th IEEE International Conference on Micro Electro Mechanical Systems Conference, MEMS 2022
Country/TerritoryJapan
CityTokyo
Period22/1/922/1/13

Keywords

  • Acoustics
  • Helmholtz resonator
  • Pneumatic actuator
  • Soundproof

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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