Designing a 3D-Printable Occluded-Ear Simulator
Authors
Thiesen, Joakim Friborg ; Thomasberg, Lasse
Term
4. term
Education
Publication year
2020
Submitted on
2020-06-04
Pages
155
Abstract
Dette projekt undersøger, om en IEC 60318-4 occluded-ear øresimulator kan fremstilles som en enkelt 3D-printet del. En sådan øresimulator er en kunstig øregang, der bruges til at teste in-ear høretelefoner. Vi målte den specifikke akustiske impedans (hvor meget øremodellen modstår lyd ved forskellige frekvenser) på flere versioner af den 3D-printede model og på en kommerciel IEC 60318-4 kobler (G.R.A.S. RA0045). Målingerne viste de forventede afvigelser i forhold til simuleringerne. Da vi målte amplituderesponsen (frekvensresponsen) for fem in-ear høretelefoner med den 3D-printede model, så vi afvigelser, der matchede mønstrene i impedansmålingerne. Den endelige konstruktion holdt afvigelserne under 4,4 dB (en relativt lille forskel i lydniveau) i frifeltsrelaterede tredjedelsoktavbånd (brede, standardiserede frekvensbånd) på tværs af målinger af fem forskellige in-ear høretelefoner i frekvensområdet 200–10.000 Hz.
This project examines whether an IEC 60318-4 occluded-ear simulator can be produced as a single 3D-printed part. Such a simulator is an artificial ear canal used to test in-ear earphones. We measured the specific acoustic impedance (how strongly the ear model resists sound at different frequencies) on several iterations of the 3D-printed model and on a commercial IEC 60318-4 coupler (G.R.A.S. RA0045). These measurements showed the deviations predicted by simulations. Measuring the amplitude (frequency) response of five insert earphones with the 3D-printed design revealed the same pattern of deviations as in the impedance. The final design kept deviations below 4.4 dB (a modest difference in level) in free-field related one-third-octave bands (standard broad frequency bands) across measurements on five different in-ear earphones in the 200–10,000 Hz range.
[This abstract was generated with the help of AI]
Keywords
Impedance Tupe ; Specific Acoustic Impedance ; Impedance ; Acoustic ; Coupler ; Occluded-Ear Simulator ; 711 ; 60318-4 ; 3D-Print ; 3D
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