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Calibration of air microphones for phonocardiography

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Abstract

Several existing methods for the calibration of air microphones for phonocardiography are briefly described and compared.

The results of calibrating some types of air microphone are given, and the influence of the coupling of the microphone with the human chest wall is discussed.

For practical applications, the microphone sensitivity to ambient noise should be compared with that to the cardiovascular sound to be detected at human chest wall.

Sommaire

Plusieurs méthodes utilisées à présent pour l'étalonnage des microphones à air employés dans la phonocardiographie sont brièvement décrites et comparées. Les résultats de l'étalonnage de cartains types des microphones à air sont donnés et l'effet de l'accouplement du microphone à la paroi de poitrine humaine est discuté.

En application pratique la sensibilité du microphone au bruit externe doit être comparée à sa sensibilité aux sons cardiovasculaires detectés à la paroi de poitrine humaine.

Zusammenfassung

Es werden kurz mehrere bekannte Verfahren für die Eichung von in der Phonokardiographie verwendeten Luftmikrophonen beschrieben und miteinander verglichen. Die Ergebnisse bei der Eichung einiger Typen von Luftmikrophonen werden angeführt, und der Einfluß der Kopplung des Mikrophons mit dem menschlichen Brustkasten wird diskutiert.

Bei der praktischen Anwendung sollte die Empfindlichkeit des Mikrophons gegenüber Umgebungsgeräuschen mit der gegenüber den kardiovaskulären Geräuschen verglchen werden, die am Brustkasten nachgewiesen werden sollen.

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Authors and Affiliations

  1. Institute of Medical Physics TNO, 45, da Costakade, Utrecht, Netherlands

    E. Van Vollenhoven & J. Wallenburg

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  1. E. Van Vollenhoven
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  2. J. Wallenburg
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Van Vollenhoven, E., Wallenburg, J. Calibration of air microphones for phonocardiography. Med. & biol. Engng. 8, 309–313 (1970). https://doi.org/10.1007/BF02477248

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  • DOI: https://doi.org/10.1007/BF02477248

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