Speech distortion measures for hearing aids

M. J. Williamson, K. L. Cummins, K. E. Hecox

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Advances in digital technology and the associated introduction of new forms of distortion led us to investigate supplementary measures of electroacoustic distortion for hearing aids. Mathematical techniques were used to formulate a working model in which the hearing aid acts as a time varying linear filter. This model embodies an approach to separating distortion into perceptually relevant and irrelevant categories. Digitized speech was converted to analog form, routed through a commercial hearing aid, and the output of the aid was redigitized and stored. For a given input signal, output speech waveforms were then compared to the model output and performance measures were derived. Distortion was plotted in three dimensions to permit interpretation with respect to time, frequency, and amplitude. These results provide a more comprehensive and general format for the analysis of hearing aid distortion.

Original languageEnglish (US)
Pages (from-to)277-282
Number of pages6
JournalJournal of Rehabilitation Research and Development
Issue number4
StatePublished - Sep 1987
Externally publishedYes

ASJC Scopus subject areas

  • Rehabilitation


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