Wireless stethoscope for recording heart and lung sound

Wireless stethoscopes are convenient for continuous patient monitoring. This paper presents a new method of analyzing acoustic properties of the heart and lung sounds using a wearable wireless stethoscope. Cardiac action parameters were extracted from the recorded digitized heart sound and analyzed. The cardiac pulse and lung sound parameters can provide detailed insights into cardiac and breathing actions. Hardware implementation of the wireless stethoscope is presented. Recorded heart and lung sounds were transmitted wirelessly to a receiver module connected to a computer. The data passed through a digital filter and normalized by amplitude scaling. The processed results were shown in the time, frequency, and time-frequency domains. The S1 and S2 acoustic properties were analyzed in details. The system aims as an electronic wearable for continuous medical diagnosis.