Evaluation of spatial audio reproduction schemes for application in hearing aid research

TL;DR

This study evaluates how different spatial audio reproduction methods and array sizes affect hearing aid algorithm performance, providing guidance for selecting suitable setups in hearing aid research.

Contribution

It systematically compares three spatial audio reproduction methods and their impact on hearing aid algorithm performance, highlighting interaction effects and practical implications.

Findings

Performance varies with reproduction method and array size.

Interaction effects influence algorithm effectiveness.

Guidelines for selecting reproduction setups in hearing aid testing.

Abstract

Loudspeaker-based spatial audio reproduction schemes are increasingly used for evaluating hearing aids in complex acoustic conditions. To further establish the feasibility of this approach, this study investigated the interaction between spatial resolution of different reproduction methods and technical and perceptual hearing aid performance measures using computer simulations. Three spatial audio reproduction methods -- discrete speakers, vector base amplitude panning and higher order ambisonics -- were compared in regular circular loudspeaker arrays with 4 to 72 channels. The influence of reproduction method and array size on performance measures of representative multi-microphone hearing aid algorithm classes with spatially distributed microphones and a representative single channel noise-reduction algorithm was analyzed. Algorithm classes differed in their way of analyzing and exploiting spatial properties of the sound field, requiring different accuracy of sound field reproduction. Performance measures included beam pattern analysis, signal-to-noise ratio analysis, perceptual localization prediction, and quality modeling. The results show performance differences and interaction effects between reproduction method and algorithm class that may be used for guidance when selecting the appropriate method and number of speakers for specific tasks in hearing aid research.