Fig. 5: Waveforms of lung and heart sounds monitored on a healthy volunteer. | Microsystems & Nanoengineering

Fig. 5: Waveforms of lung and heart sounds monitored on a healthy volunteer.

From: A two-stage amplified PZT sensor for monitoring lung and heart sounds in discharged pneumonia patients

Fig. 5

a, b Lung sound waveform detected by our sound sensor (a) and by a commercial high-end electric stethoscope (b). c, d Heart sound signal recorded by our sensor (c) and by commercial stethoscopy (d). The volunteer was a 29-year-old healthy male (#1), and sound signals were recorded during a resting respiratory function

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