ブレイクポイントを用いた表面筋電図の周波数スペクトルをアンサンブル平均するときのパラメータの決定方法

抄録

An ensemble averaging of frequency spectrum of biosignal corresponds to a smoothing of frequency spectrum obtained by Fourier transform of entire signal. As a general rule, a variation of frequency spectrum obtained by an ensemble averaging of signals becomes small, therefore, a spectrum becomes smooth by an increasing of segment number. On the other hand, a decrease of number of data per segment under dividing signals into a plurality of segments decreases a frequency resolution. Therefore, an ensemble averaging which is balanced between spectrum smoothness and frequency resolution is desirable. However, there is no definite method to determine both a segment number and a segment overlap ratio, which are parameters in ensemble averaging of frequency spectrum. In this study, we propose a method to determine these two parameters in surface electromyogram using breakpoint. Also, we present experimental results that were applied our method to surface electromyogram.