Evaluation of an adaptive directional system in a DSP hearing aid

  • Bentler R
  • Tubbs J
  • Egge J
 et al. 
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Abstract

The effectiveness of an adaptive directional microphone design, as implemented in the Phonak Claro behind-the-ear hearing aid, is evaluated. Participants were fit bilaterally and tested in 2 environments, an anechoic chamber and a moderately reverberant classroom, with the microphones in the fixed (cardioid) setting and the adaptive setting. Five speakers were placed between 110 degrees and 250 degrees azimuth around the listener. Speech-weighted noise was presented from those speakers at an overall level (OAL) of 65 dB (A). Noise was increased by 8 dB from 1 speaker at a time, using 2-s modulation and random assignment, while the output from the other speakers was reduced to maintain the constant OAL. Results of 2 speech perception tasks used as outcome measures indicated that the adaptive system was not able to follow the dominant noise source in the presence of lower level noise sources. Self-report measures obtained after blinded home trials were consistent with laboratory findings that the participants did not perceive this adaptive microphone design to be more effective than the default fixed-microphone option.

Author-supplied keywords

  • Adaptive
  • Directional microphone
  • Hearing aids

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Authors

  • Ruth A. Bentler

  • Jill L. Tubbs

  • Jessica L M Egge

  • Gregory A. Flamme

  • Andrew B. Dittberner

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