The Design For An Electronic Stethoscope

Heart sounds and breath sounds are important indexes of heart and respiratory system is normal.Although the ECG,X-ray and other high-tech inspection method have appeared now,the auscultation as a traditional means of inspection,is still a indispensable skill for a doctor.Traditional acoustics stethoscope is simple and practical,and has a good auscultation result,but it's also has some deficiencies:there are some limits for doctor's hearing sensitivity;only one person can use it at the same time,that means it cannot be used at the same time by different people.And it's inconvenience for teaching and consultation.So the paper put forward to the electronic stethoscope design for teaching and consultation.A sound sensor has been made in this electronic stethoscope system with electret microphone,it combine with traditional stethoscope.The collected signals will be output directly to the power amplifying for playing;at the same time,it will be output the filter with different frequency range and add circuit for signal processing.And then the collected signal will be translate into digital signal using MCU.MCU will transmit the digital signal to PC via a serial port.The system software is designed by Lab VIEW,which can realize the signal's real-time waveform displaying,storage,playback and analysis,and other functions.Through the actual test,this electronic stethoscope system can amplify the voice of auscultation,which can makes others in environment hearing the auscultation.System software can display and save the real-time waveform,record and playback auscultation voice,and also can playback and analysis the waveform information.In conclusion,this electronic stethoscope be designed meeting the requirement.