Myoelectric-controlled exoskeletal elbow robot to suppress essential tremor: Extraction of elbow flexion movement using STFTs and TDNN

Takeshi Ando, Masaki Watanabe, Keigo Nishimoto, Yuya Matsumoto, Masatoshi Seki, Masakatsu G. Fujie

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    Essential tremor is the most common of all involuntary movements. Many patients with an upper-limb tremor have serious difficulties in performing daily activities. We developed a myoelectric-controlled exoskeletal robot to suppress tremor. In this article, we focus on developing a signal processing method to extract voluntary movement from a myoelectric in which the voluntary movement and tremor were mixed. First, a Low-Pass Filter (LPF) and Neural Network (NN) were used to recognize the tremor patient's movement. Using these techniques, it was difficult to recognize the movement accurately because the myoelectric signal of the tremor patient periodically oscillated. Then, Short-Time Fourier Transformation (STFT) and NN were used to recognize the movement. This method was more suitable than LPF and NN. However, the recognition timing at the start of the movement was late. Finally, a hybrid algorithm for using both short and long windows' STFTs, which is a kind of "mixture of experts," was proposed and developed. With this type of signal processing, elbow flexion was accurately recognized without the time delay in starting the movement.

    Original languageEnglish
    Pages (from-to)141-149
    Number of pages9
    JournalJournal of Robotics and Mechatronics
    Volume24
    Issue number1
    Publication statusPublished - 2012 Feb

    Keywords

    • EMG
    • Exoskeleton
    • Myoelectric signal
    • Tremor
    • Voluntary movement

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Computer Science(all)

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