本論文之主要目的在設計一可變動調頻電刺激系統並進行實際人體電刺激實驗，以評估此系統在人體生理適應上的可能應用。此刺激器之主要設計原理是以低頻弦波調制中頻載波產生中頻刺激信號。輸出波形是利用兩組弦波產生電路，經過具有將信號平均調變功能的四象限乘法器合成調制波。為了提升刺激療效，在系統中採用頻率可以變動的頻率調變技術，輸出信號的頻率是藉由數位控制電路調整。由實際人體測試電刺激有感實驗與耐受性試驗，發現在三種不同位置下，實驗者對於低頻頻率漸減調制模式刺激感覺強烈。與頻率固定的調變頻率刺激比較，變動調變頻率更能長時間持續有感刺激，並提高療效和便利於實際治療應用。

In this thesis, we have developed a variable frequency modulation (FM) electrical stimulation system. It generates stimulated signals to modulate the middle-frequency carrier with low-frequency sine wave. The output waves are produced by two sine wave functions and synthesized by a four-quadrant multiplier with balance. The frequency of the stimulation waveform can be controlled from a digital unit. In order to have more effective stimulation, this study adopted a variable FM method in the system. We tested the curative effect of the electrical stimulation based on the feeling and the tolerance of human body. Our experimental results showed that the muscle is very sensitive to ramped low-frequency waveforms for three different positions. When compared with fixed FM stimulation, the variable FM stimulation has longer and better curative effect.

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