Bulletin européen de physiopathologie respiratoire
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Bull Eur Physiopathol Respir · Jan 1985
Comparative Study[Measurement of the frequency response of several stethoscopes in common use. Consequences for cardiac and pulmonary auscultation].
We measured the frequency response of eight stethoscope membranes and of thirteen types of stethoscopes. Measurements were made in an anechoic chamber calculating the ratio between the intensity of a sinusoidal sound coming from a loud speaker and the intensity of the transmitted sound through the membrane of the stethoscope. ⋯ By contrast, fidelity of the measured stethoscopes was good. Discussion of the results suggests modification of stethoscope design to eliminate faults of sound transmission and to elaborate a microphone sensor allowing an electric transmission.