Key result
The digital filter (IIR) in the electronic stethoscope achieved a higher signal-to-noise ratio (20.43±1.78 dB) compared to the analog filter (12.5±2.5 dB) for order 4.
Why the study?
Heart sounds show specific patterns in certain diseases, and an electronic stethoscope with a visual display was needed to help users recognize these patterns to diagnose heart disease.
Absolute Event Rate: 20.43% vs 12.5%
An electronic stethoscope using a digital IIR filter provides a higher signal-to-noise ratio for heart sounds compared to an analog filter.
The heart sound produced in some cases of the disease shows a certain pattern. The purpose of this study was to design an electronic stethoscope for cardiac auscultation with the following display. The contribution in this study is being able to show certain patterns that can be diagnosed in the sound signal. So that the pattern can be known when there is a heart disease disorder, an electronic stethoscope will be made for auscultation of the next display, making it easier for users to diagnose heart disease. The heart sound is obtained from the mechanical activity of the heart which is tapped by a condenser mic. The heart sound will be held in a pre-amp circuit, then the filters used are High Pass Filters and Low Pass Filters with an interrupted frequency of 20-95 Hz. The output of the filter circuit will enter the booster circuit. Then it will be processed by the microcontroller. In processing the data that will be displayed on Nextion and Speaker, the author uses Arduino Mega. Based on the test, it can be seen that the digital filter has a slight error rate because it removes the most noise, while in the analog filter there is still a lot of noise. The results of the research that has been done can be implemented using a system that really supports the needs.
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Rohman et al. (2022) studied Healthy (n=8). Digital filter (Infinite Impulse Response) vs. Analog filter (Butterworth) was evaluated on Signal to Noise Ratio (SNR) in dB for order 4 filter. The digital filter (IIR) in the electronic stethoscope achieved a higher signal-to-noise ratio (20.43±1.78 dB) compared to the analog filter (12.5±2.5 dB) for order 4.
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