The Influence of Gain Control Rotation on Nonlinear Distortion in Hearing Aids To investigate the relationship of nonlinear distortion to gain control position, 35 hearing aids of differing makes and models were examined. Distortion levels were observed at eight gain settings, each of which represented 12.5% of the total available rotation of the gain control. Distortion was measured at 500, 700, 900 ... Research Article
Research Article  |   September 01, 1967
The Influence of Gain Control Rotation on Nonlinear Distortion in Hearing Aids
 
Author Affiliations & Notes
  • Stephen H. Lotterman
    Veterans Administration Hospital, Washington, D.C.
  • Roger N. Kasten
    Veterans Administration Hospital, Washington, D.C.
Article Information
Hearing Aids, Cochlear Implants & Assistive Technology / Research Articles
Research Article   |   September 01, 1967
The Influence of Gain Control Rotation on Nonlinear Distortion in Hearing Aids
Journal of Speech, Language, and Hearing Research, September 1967, Vol. 10, 593-599. doi:10.1044/jshr.1003.593
History: Received December 1, 1966
 
Journal of Speech, Language, and Hearing Research, September 1967, Vol. 10, 593-599. doi:10.1044/jshr.1003.593
History: Received December 1, 1966

To investigate the relationship of nonlinear distortion to gain control position, 35 hearing aids of differing makes and models were examined. Distortion levels were observed at eight gain settings, each of which represented 12.5% of the total available rotation of the gain control. Distortion was measured at 500, 700, 900 Hz, and at the frequency of maximum distortion. The results support previous findings of high nonlinear distortion at or near maximum acoustic gain in some hearing aids. In order to obtain reductions in the distortion levels observed at full-on gain, extensive counter rotations of the gain control dial frequently were necessary.

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