Measurement of hearing aid internal noise

James Lewis, Shawn S. Goodman, Ruth A. Bentler

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Hearing aid equivalent input noise (EIN) measures assume the primary source of internal noise to be located prior to amplification and to be constant regardless of input level. EIN will underestimate internal noise in the case that noise is generated following amplification. The present study investigated the internal noise levels of six hearing aids (HAs). Concurrent with HA processing of a speech-like stimulus with both adaptive features (acoustic feedback cancellation, digital noise reduction, microphone directionality) enabled and disabled, internal noise was quantified for various stimulus levels as the variance across repeated trials. Changes in noise level as a function of stimulus level demonstrated that (1) generation of internal noise is not isolated to the microphone, (2) noise may be dependent on input level, and (3) certain adaptive features may contribute to internal noise. Quantifying internal noise as the variance of the output measures allows for noise to be measured under real-world processing conditions, accounts for all sources of noise, and is predictive of internal noise audibility.

Original languageEnglish (US)
Pages (from-to)2521-2528
Number of pages8
JournalJournal of the Acoustical Society of America
Volume127
Issue number4
DOIs
StatePublished - Apr 1 2010

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hearing
stimuli
Hearing Aids
microphones
Stimulus
Amplification
noise reduction
cancellation

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

Cite this

Measurement of hearing aid internal noise. / Lewis, James; Goodman, Shawn S.; Bentler, Ruth A.

In: Journal of the Acoustical Society of America, Vol. 127, No. 4, 01.04.2010, p. 2521-2528.

Research output: Contribution to journalArticle

Lewis, James ; Goodman, Shawn S. ; Bentler, Ruth A. / Measurement of hearing aid internal noise. In: Journal of the Acoustical Society of America. 2010 ; Vol. 127, No. 4. pp. 2521-2528.
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