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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.
- 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