Abstract
Abstract Electro-acoustic human heartbeat detector have been made with the main parts : (a) stetoscope (piece chest), (b) mic condenser, (c) transistor amplifier, and (d) cues analysis program with MATLAB. The frequency components that contained in heartbeat. cues have also been extracted with Short Time Fourier Transform (STFT) from 9 volunteers. The results of the analysis showed that heart rate appeared in every cue frequency spectrum with their harmony. The steps of the research were including detector instrument design, test and instrument repair, cues heartbeat recording with Sound Forge 10 program and stored in wav file ; cues breaking at the start and the end, and extraction/cues analysis using MATLAB. The MATLAB program included filter (bandpass filter with bandwidth between 0.01 – 110 Hz), cues breaking with hamming window and every part was calculated using Fourier Transform (STFT mechanism) and the result were shown in frequency spectrum graph. Keywords: frequency components extraction, heartbeat cues, Short Time Fourier Transform
Highlights
Denyut jantung termasuk isyarat biomedik yang berasal dari tubuh manusia
The results of the analysis showed that the heart rate appeared in every cue frequency spectrum with their harmony
Selain itu juga telah diekstraksi komponen-komponen frekuensi yang terkandung di dalam isyarat detak jantung dengan Short Time Fourier Transform (STFT) untuk 9 (sembilan) orang sukarelawan
Summary
Denyut jantung termasuk isyarat biomedik yang berasal dari tubuh manusia. Isyarat phonocardiogram (PCG) menyediakan informasi tentang kondisi jantung seseorang. STFT telah secara intensif digunakan untuk menganalisis isyarat non-stasioner dengan cara melihat isyarat melalui window yang letak waktunya pada pusat dan menghitung transformasi Fourier. Tujuan dari kegiatan ini adalah untuk membuat prototype alat pendeteksi (termasuk merekam) detak jantung manusia secara akustik, dan untuk mengekstraksi komponen-komponen frekuensi yang terkandung di dalam isyarat detak jantung dengan
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