The quality of the sensor directly impacts the quality of the real-time audio output as well as all analyses performed on the measured waveforms. The stethoscope acoustic sensor was an integral hardware component of the system. Hardware Design & Implementation top Stethoscope Acoustic Sensor A digital stethoscope can be used to assist physicians in analyzing cardiac signals in real time during auscultation to reduce the risks of not detecting certain conditions. Heart murmurs may go unnoticed during routine check-ups since detection relies on the training of physicians, the quality of the equipment used, and the severity of the condition. This project is meant to provide a framework for developing useful embedded CAD tools for cardiac murmur detection. The MATLAB interface also uses the transmitted data to calculate and display the patient’s average heart rate in beats per minute.
#DOES EQUATIONSTOMATRIX EXIST IN MATLAB 2012 PC#
Real-time and recorded data can also be visualized using a MATLAB interface that runs on a separate PC and connects to the stethoscope system via the USART interface on the microcontroller. For the user interface, the system includes a 4-line 20-character wide LCD display and a 16-button keypad. In addition, the stethoscope uses a 1MB external Flash memory chip to record and playback audio waveforms.
The captured signals are outputted via pulse-width modulation to a standard 3.5 mm audio socket for real-time auscultation. The system uses a custom-built sensor to capture heart sounds at 8 kHz and converts them to electrical signals to be processed by an ATmega644 microcontroller. The purpose of this project was to design and implement a digital stethoscope to serve as a platform for potential computer aided diagnosis (CAD) applications for the detection of cardiac murmurs. "A digital stethoscope that can amplify, play, and record heart signals in real-time."
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