abstract - ETD UGM

ABSTRACT
Electromyograph (EMG) had a function of detecting the potential
existence of electricity that was produced by muscle cells at the time of the
contraction muscle and relaksasi. The signal of muscle electricity could be
received through the EMG electrode fitting that was placed in the surface of skin
to the muscle that will be taken by his signal data. The system that was produced
from EMG could study the muscle signal from the surface of skin when someone
carried out the certain movement. So as to be able to be used for the control signal
of the system or other equipment.
The EMG signal had the characteristics of the quite small amplitude (0 10
mV) and the frequency in range 20 500 Hz. [11]. The feature extractionwas
carried out in the time domain by producing the RMS value the amplitude of the
EMG signal and the feature extractionwas in the frequency domain used by Fast
Fourier Transform (FFT) by counting the Mean Power Frequency value (MPF)
and the Frequency Median (MDF) the EMG signal.
From results of the feature extraction was received by the MPF value,
MDF and RMS to the muscle extensor carpi radialis longus, flexor carpi ulnaris
and flexor carpi radialis for the HO condition, HC, WF and WE. Nilai MPF
lowered 56.507 Hz and the MPF value highest 209.67 Hz. The MDF value
lowered 39.512 Hz and the MDF value highest 152.28 Hz. The RMS value the
lowered amplitude 0.10681 mV and the RMS value highest 0.91393 mV.
Keywords : Electromyograph Signal, Fast Fourier Transform (FFT), Mean Power
Frequency (MPF), Median Frequency (MDF), RMS, Feature Extraction
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INTISARI
Electromyograph (EMG) berfungsi untuk mendeteksi adanya potensial listrik
yang dihasilkan oleh sel-sel otot pada saat otot kontraksi dan relaksasi. Sinyal listrik
otot dapat diperoleh melalui pemasangan elektroda EMG yang diletakkan di
permukaan kulit pada otot yang akan diambil data sinyalnya. Sistem yang dihasilkan
dari EMG mampu mempelajari sinyal otot dari permukaan kulit saat seseorang
melakukan kondisi tertentu. Sehingga dapat digunakan untuk sinyal kendali sistem
atau perangkat lain.
Sinyal EMG mempunyai karakteristik amplitudo cukup kecil (0 – 10 mV)
dan frekuensi pada range 20 – 500 Hz.[11]. Ekstraksi ciri dilakukan pada domain
waktu dengan menghasilkan nilai RMS amplitudo sinyal EMG dan ekstraksi ciri
dalam domain frekuensi digunakan Fast Fourier Transform (FFT) dengan
menghitung nilai Mean Power Frequency (MPF) dan Median Frequency (MDF)
sinyal EMG.
Dari hasil ekstraksi ciri diperoleh nilai MPF, MDF dan RMS pada otot
extensor carpi radialis longus, flexor carpi ulnaris dan flexor carpi radialis untuk
kondisi HO, HC, WF dan WE. Nilai MPF terendah 56,507 Hz dan nilai MPF
tertinggi 209,67 Hz. Nilai MDF terendah 39,512 Hz dan nilai MDF tertinggi 152,28
Hz. Nilai RMS amplitudo terendah 0,10681 mV dan nilai RMS tertinggi 0,91393
mV.
Kata kunci : Sinyal Electromyograph, Fast Fourier Transform (FFT), Mean Power
Frequency (MPF), Median Frequency (MDF), RMS, Ekstraksi Ciri
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