Comparison of Position Estimation Methods for the Rotating Equatorial Microphone
Paper in proceeding, 2022

We present a prototype of a microphone that moves rapidly along the equator of a rigid spherical scatterer. Our prototype allows for up to 100 rotations per second. It will enable processing methods like beamforming or sound field decomposition that are conventionally performed using microphone arrays. Solutions that assume one or more moving microphones have already been proposed in the literature but have not been verified in practise. Most of these methods require precise knowledge of the instantaneous microphone position, for which no convenient practical solution exists. Recent advancements in microphone array processing enable employing simple microphone trajectories, and recent advancements in 3D printing, microcontrollers, and high-speed electric motors allow for the required control of the movement. This paper presents the design of our prototype and evaluates its performance. Of particular interest is the accuracy of the estimation of the microphone's instantaneous position. This paper demonstrates that monitoring the passing time instants of a photodiode that is integrated into the rotating sphere provides the highest precision and robustness.

hardware design

Microphone array processing

acoustic transfer function

Author

Jeremy Lawrence

University of Erlangen-Nuremberg (FAU)

Jens Ahrens

Chalmers, Architecture and Civil Engineering, Applied Acoustics

Nils Peters

University of Erlangen-Nuremberg (FAU)

International Workshop on Acoustic Signal Enhancement, IWAENC 2022 - Proceedings


9781665468671 (ISBN)

17th International Workshop on Acoustic Signal Enhancement, IWAENC 2022
Bamberg, Germany,

Subject Categories

Robotics

Control Engineering

Signal Processing

DOI

10.1109/IWAENC53105.2022.9914776

More information

Latest update

10/26/2023