A Comparison of Four Hearing Aid Measurement Systems Measurements of hearing aid performance were made using four different electroacoustic systems. Nine hearing aids were evaluated three times in each of the four systems: a standard Bruel and Kjaer apparatus, a Fonix 5000, and both a Phonic Ear HC 1000 and HC 2000. Tests included frequency response and, when ... Research Article
Research Article  |   December 01, 1977
A Comparison of Four Hearing Aid Measurement Systems
 
Author Affiliations & Notes
  • Thomas H. Townsend
    Central Michigan University, Mt. Pleasant
  • Daniel M. Schwartz
    Walter Reed Army Medical Center, Washington, D.C.
Article Information
Research Articles
Research Article   |   December 01, 1977
A Comparison of Four Hearing Aid Measurement Systems
Journal of Speech, Language, and Hearing Research, December 1977, Vol. 20, 718-730. doi:10.1044/jshr.2004.718
History: Received June 25, 1976 , Accepted June 14, 1977
 
Journal of Speech, Language, and Hearing Research, December 1977, Vol. 20, 718-730. doi:10.1044/jshr.2004.718
History: Received June 25, 1976; Accepted June 14, 1977

Measurements of hearing aid performance were made using four different electroacoustic systems. Nine hearing aids were evaluated three times in each of the four systems: a standard Bruel and Kjaer apparatus, a Fonix 5000, and both a Phonic Ear HC 1000 and HC 2000. Tests included frequency response and, when possible, total harmonic distortion, second harmonic distortion, and third harmonic distortion. Results were equivalent for frequency response and second harmonic distortion, whereas significant differences occurred for total harmonic distortion and third harmonic distortion at both the low and high frequencies. The degree to which the sum of second harmonic distortion and third harmonic distortion fails to equal the total harmonic distortion was also examined. In the low frequency region, second harmonic distortion plus third harmonic distortion yielded values considerably less than the total harmonic distortion, although good agreement was found in the midfrequencies.

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