Some issues in utilizing probe tube microphone systems.
Probe tube microphone systems are a useful validation tool for optimizing the hearing aid selection and fitting processes. To date, the terminology involved in using these systems has not been standardized, resulting in confusion in the measurements themselves and in associated parameters. Real time and stored procedures for sound field equalization have been adopted for real ear measurements from ANSI and IEC standards which were written for 2 cc coupler and manikin measurements. Suggestions are made for equivalent definitions pertaining to probe tube microphone measurements. Several of the equalization methods for probe tube microphone measurements are compared in the context of those ANSI and IEC standards from which they are derived. Tradeoffs in the selection of input stimulus type are examined. Of the probe tube microphone systems currently available, performance features and flexibility varies widely. Certain optional features associated with general purpose microcomputers, if incorporated in a probe tube microphone system would enhance the day-to-day operation of a hearing aid dispensary.
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Argosy Electronics, Inc., Edina, Minnesota.
D000162:Acoustics; D001309:Auditory Threshold; D006310:Hearing Aids; D006801:Humans; D008953:Models, Anatomic