Thomas G. Dolan

Date of Award


Document Type


Degree Name

Master of Science (M.S.) in Speech: Emphasis in Speech Pathology/Audiology


Speech Communication

Physical Description

1 online resource (61 p.)


Hearing aids, Transients (Electricity), Automatic gain control




The output characteristics of five compression hearing aids in response to a transient signal were examined to determine if, the input-output function (i.e. output levels of the hearing aid as a function of input level) for a transient signal could be made to approximate that of a continuous signal, by activating the compression circuit with a second signal (activator). Input-output functions for three input compression and two output compression hearing aids were obtained in order to determine if: 1. the automatic gain control (AGC) was activated by the second signal and the transient signal output approximates that of a continuous tone, and 2. if the second tone was evident in the output of the hearing aid and thereby potentially being an interfering factor in aided auditory brainstem response (ABR) measurement.


This thesis was submitted for the Master of Science in Audiology.

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