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Sound differences between electronic and acoustic stethoscopes

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Figure

Table 1 Description of  the  available operating modes—digital filter settings—for the  investigated electronic stethoscopes, accordingly to  the  data provided
Fig. 1 Electronic stethoscopes—acoustic spectra. The mean acoustic spectra of heart auscultation signals recorded using various investigated electronic stethoscopes: a–d operating in different available modes
Fig. 3 The computed values of bell‑to‑diaphragm coefficients. The computed values of bell‑to‑diaphragm coefficients—ratios of amplitudes of specific frequency components of signals recorded using various stethoscopes operating in bell and diaphragm modes, expressed in logarithmic scale
Fig. 5 Acoustic stethoscope—octave analysis. Box plot presenting results of octave analysis of energy of signals recorded using two different chestpieces of an acoustic stethoscope

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