Document Detail

Impact on hearing aid targets of measuring thresholds in dB HL versus dB SPL.
MedLine Citation:
PMID:  14570239     Owner:  NLM     Status:  MEDLINE    
Audiometric measurements are traditionally made in dB HL, which by definition are specified relative to the sound pressure level (SPL) in a coupler. Real-ear dB SPL is then estimated by applying an average ear transform to the coupler value. However, individual variation in ear canal acoustics and variations in transducer placement strongly influence the dB SPL of signals arriving at the eardrum. In this paper, data from 1814 ears are presented, showing that the distribution of eardrum dB SPL for a fixed signal level varies across ears and across frequency by as much as 40 dB. The impact of this variance upon hearing aid targets computed with the NAL-NL1 fitting algorithm is examined by comparing the targets obtained from using an average transform with those obtained when audiometric data in dB SPL are obtained by applying individually measured real-ear-to-coupler difference (RECD) values to dB HL thresholds. The impact can be considerable.
Gabrielle H Saunders; Donald E Morgan
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  International journal of audiology     Volume:  42     ISSN:  1499-2027     ISO Abbreviation:  Int J Audiol     Publication Date:  2003 Sep 
Date Detail:
Created Date:  2003-10-22     Completed Date:  2004-02-11     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  101140017     Medline TA:  Int J Audiol     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  319-26     Citation Subset:  IM    
National Center for Rehabilitative Auditory Research, Portland, OR 97207, USA.
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MeSH Terms
Acoustic Stimulation
Auditory Threshold
Hearing Aids*
Prosthesis Fitting

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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