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When is a decibel not a decibel?: The application of decibel scales and calibration in clinical audiology

Published online by Cambridge University Press:  29 June 2007

Graham Beynon*
Affiliation:
(Cambridge)
*
Mr Graham Beyon, Department of Audiology, Addenbrooke's Hospital, Hill's Road, Cambridge CB2 2QQ

Abstract

Decibel scales are a very important but potentially confusing subject for the clinician. Misunderstanding can, at worst, lead to inappropriate management which is detrimental to the patient. This paper sets out, from the viewpoint of an acoustician, the calibration and meaning of the various decibel scales in common use, shows how they are applied to the clinical setting, and explains their limitations.

Type
Main Articles
Copyright
Copyright © JLO (1984) Limited 1993

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References

American Speech-Language-Hearing Association (1991) Sound-field measurement tutorial. ASHA 33 (Suppl. 3): 2537.Google Scholar
Beynon, G. J. (1992) An investigation in the variability in soundfield audiometry caused by subject movement, MSc thesis, University of Southampton, (unpublished).Google Scholar
Cox, R. M., McCormick, V. A. (1987) Electroacoustic calibration for sound-field warble tone thresholds. Journal of Speech and Hearing Disorders 52: 388392.CrossRefGoogle ScholarPubMed
Hassall, J. R., Zaveri, K. (1979). Acoustic Noise Measurements, 4th Edition, Bruel and Kjaer, Denmark.Google Scholar
International Organization for Standardization (1985) Acoustics – Standard reference zero for the calibration of pure tone air conduction audiometers. ISO 389: (with Addendum 1: 1983) and (Addendum 2: 1985).Google Scholar
International Organization for Standardization (1987) Acoustics – Standard reference zero for the calibration of pure tone bone conduction audiometers. ISO 7566.Google Scholar
International Organization for Standardization (1987) Acoustics – Normal equal-loudness level contours. ISO 226: (F).Google Scholar
Killion, M. (1978) Revised estimate of minimum audible pressure: where is the missing 6 dB?: Journal of the Acoustical Society of America 63: 1501 1508.CrossRefGoogle ScholarPubMed
Kuhn, G. F., Guernsey, R. M. (1983) Sound pressure distribution about the human head and torso. Journal of the Acoustical Society of America 73: 95105.CrossRefGoogle ScholarPubMed
Morgan, D. F., Dirks, D. D., Bower, D. R. (1979) Suggested sound pressure levels for frequency modulated tones in the sound field. Journal of Speech and Hearing Disorders XLIV: 3754.CrossRefGoogle Scholar
Shaw, E. A. G. (1966) Ear canal pressure generated by circumaural and supra-aural earphones. Journal of the Acoustical Society of America 39: 471479.CrossRefGoogle Scholar
Shaw, E. A. G. (1975) Transformation of sound pressure level from the free-field to the eardrum in the horizontal plane. Journal of the Acoustical Society of America 56: 18491861.Google Scholar
Shaw, E. A. G., Vaillancourt, M. M. (1985) Transformation of sound pressure level from the free-field to the eardrum presented in numerical form. Journal of the Acoustical Society of America 78: 11201127.CrossRefGoogle Scholar
Skinner, M. W. (1988) Hearing Aid Evaluation, 1st Edition, Prentice-Hall, New Jersey.Google Scholar
Stream, R. W., Dirks, D. D. (1974) Effect of loudspeaker position on differences between earphones and free-field thresholds (MAP and MAF). Journal of Speech and Hearing Research 17: 549568.CrossRefGoogle ScholarPubMed
Walker, G., Dillon, H. D., Byrne, D. (1984) Sound-field audiometry: recommended stimuli and procedures. Ear and Hearing 5: 1321.CrossRefGoogle ScholarPubMed