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Audiometric earphone discomfort level and hearing aid saturation sound pressure level for a 90 decibel input signal (SSPL90) as measured in the human ear canal.

Authors :
Leijon A
Harford E
Lidén G
Ringdahl A
Dahlberg AK
Source :
Ear and hearing [Ear Hear] 1983 Jul-Aug; Vol. 4 (4), pp. 185-9.
Publication Year :
1983

Abstract

The acoustical problems involved in matching the saturation sound pressure level for a 90 dB input signal (SSPL90) of a hearing aid to individual discomfort level were investigated. The real ear SPL (RE/SSPL90) produced by a supra-aural earphone used when measuring uncomfortable loudness (UCL), and RE/SSPL90 produced by three different hearing aids at 90 dB SPL input, were measured for nine subjects, using a miniature microphone technique, and compared to the corresponding coupler levels used when matching hearing aid maximum output to UCL. It was found that a hearing aid often gives about 5 dB, and sometimes 10 dB, higher RE/SPLs than the earphone, if the hearing aid output levels, as measured in a 2-cc coupler (IEC126), are equal to the earphone output levels as measured in a 6-cc coupler (NBS9A). It is recommended that a safety margin of at least 5 dB be used in the preliminary fitting when matching hearing aid SSPL90 to the patient's UCL, converted to dB SPL.

Details

Language :
English
ISSN :
0196-0202
Volume :
4
Issue :
4
Database :
MEDLINE
Journal :
Ear and hearing
Publication Type :
Academic Journal
Accession number :
6618037
Full Text :
https://doi.org/10.1097/00003446-198307000-00002