Document Detail

Revised estimate of minimum audible pressure: where is the "missing 6 dB"?
MedLine Citation:
PMID:  690329     Owner:  NLM     Status:  MEDLINE    
Eardrum pressures at hearing threshold have been calculated from both earphone data (ISO R389-1964 and ANSI S3.6-1969) and free-field data (ISO R226-1961). When head diffraction, external-ear resonance, and an apparent flaw in ISO R226 are accounted for in the free-field data, and real-ear versus coupler differences and physiological noise are accounted for in the earphone data, the agreement between the two derivations is good. At the audiometric frequencies of 125, 250, 500, 1000, 2000, 4000, and 8000 Hz, the estimated eardrum pressures at absolute threshold are 30, 19, 12, 9, 15, 13, and 14 dB SPL, respectively. Except for the effects of physiological noise at low frequencies, no evidence of the "missing 6 dB" is seen, an observation consistent with the experimental results of several recent studies.
M C Killion
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  63     ISSN:  0001-4966     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  1978 May 
Date Detail:
Created Date:  1978-12-02     Completed Date:  1978-12-02     Revised Date:  2006-12-27    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1501-8     Citation Subset:  IM    
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MeSH Terms
Audiometry / instrumentation,  methods,  standards*
Auditory Threshold / physiology*
Reference Standards

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

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