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1. Introduction One of the rapidly advancing fields in the era of the Fourth Industrial Revolution is wearable devices. Wearable devices need to be easy to attach to the body and portable, so miniaturization and low-power operation are essential. The bioelectrical signals processed by wearable devices are characterized by small amplitude and low frequency, and the amplitude and frequency range of each signal (ECG, EMG, EEG, and EOG) are different [1].
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