Electronic stethoscope switches between two measurement modi and filters signal according to selected measurement modus before sending sound signal to reception circuit for evaluation

摘要

The electronic stethoscope includes a microcontrol unit that is connected to a switching module that allows switching between two measurement modi (heart sound modus, lung modus, etc.). The hearing piece (10) sends the receiving sound signals to an operational preamplifier. The signals are sent after amplification to a corresponding filter of a filter circuit according to the selected measurement modus. The filtered sound signals are sent to a reception circuit (100) for evaluation by the doctor.