Abstract
A wearable, hybrid adaptive beamformer (HAB) device has been developed using a four-microphone array and a combination of adaptive and fixed-weight beamforming. The HAB is being evaluated with hard-of-hearing (HoH) listeners in a variety of environments. Pilot tests used HINT test sentences and noise from separate loudspeakers (106-deg angle) in an audiological booth (AI-weighted direct-to-reverberant ratio 9.1 dB). Measured sentence reception thresholds (SRTs) indicated that the HAB provided 14.5, 16.1, and 12.8 dB improvement over the single microphone for two normal-hearing and one HoH listener. Results will be reported for ongoing objective and subjective testing of elderly listeners with mild to moderate hearing losses. Subjects are fitted monaurally with a commercially available behind-the-ear hearing aid with a dual microphone array following the NAL-R fitting algorithm. Comparisons are made between listeners’ SRTs in noise, using: (a) conventional single-microphone, (b) dual microphone, and (c) four-microphone HAB devices. HINT sentences are presented with single and dual noise sources at two arrival angles in three room environments: (a) sound booth, (b) favorable environment, and (c) noisy/reverberant environment. Listeners rate the three hearing aid systems and indicate their preference in paired comparison testing. SRTs, ratings, and preference judgments will be reported. [Work supported by NIH.]
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