Abstract
Directionality has become the dominant method to improve the signal‐to‐noise ratio in hearing aids. Quantification of differences in the amount of directionality between systems has become a source of scientific, as well as marketing, interest. Developments in directionality now involve signal processing methods that interact with directional microphones based upon adaptive algorithms in order to broaden the appeal and usefulness of these systems. The ANSI S3.35 revision for 2004 improves the methodology for relating measures of directionality to expected performance when using many systems, but fails to address measurements using these adaptive systems. These systems respond differently depending upon the type, volume, or location of a stimulus, and will generate different results using the single noise source technique included in the standard compared to diffuse noise conditions. This presentation presents data using various measurement techniques to quantify the differences between directional systems. Different types of adaptive systems will be identified that vary in their interaction with the ANSI methods and an understanding of how measurements change with changes in technique will be presented.
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