Electronic Stethoscope with Noise Cancellation for Telehealth Peripheral

Noise contamination and inaudible physiological signals are major concerns in regular acoustic stethoscopes. This project addresses these problems by implementing a noise cancelling electronic stethoscope. Moreover, the implemented stethoscope has a capability to transmit recorded data via internet to allow remote monitoring and tele diagnosis. Tests were conducted in residential, outdoor, ambulance, and clinic locations to determine the improvement in the signal-to-noise ratio. In the residential setting, the measured average SNR of the original heart signal compared to the signal applied with least mean square algorithm, was improved from 10.31 dB to 51.32 dB. For the lung sound in the same residential environment, the measured average SNR was improved from 15.69 dB to 60.87 dB.