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J Appl Physiol 71: 2173-2177, 1991;
8750-7587/91 $5.00
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Journal of Applied Physiology, Vol 71, Issue 6 2173-2177, Copyright © 1991 by American Physiological Society

ARTICLES

Original waveform of lung sound crackles: a case study of the effect of high-pass filtration

T. Katila, P. Piirila, K. Kallio, E. Paajanen, T. Rosqvist and A. R. Sovijarvi
Helsinki University of Technology, Helsinki University Hospital, Finland.

In lung sound research, low-frequency noise usually disturbs the sound signal being recorded. Some researchers therefore use high-pass filtration before the final analysis. In this study, the effect of digital and analog high-pass filtration on the morphology of the lung sound crackles is evaluated. The original nonprefiltered crackle waveform is presented, and the effect of the high-pass filtration on the crackle waveform characteristics is elucidated in one patient with silicoasbestosis.


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