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The TransMedica Model 100 Digital Electronic Stethoscope uses a piezoelectric element to convert chest wall motion into electrical impulses. It employs a coupling medium to conduct chest wall motions directly onto the transducer. It also uses a second transducer to detect ambient room noises and special circuitry to reverse the phase of these signals for cancellation. The device uses a general purpose digital computer to process, store, and display sound recordings, specifically Amplitude versus Time (Time Series = Strip Chart).