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Novel Mounts of Accelerometers of Finger Braille Recognition System

Finger Braille is one of the tactual communication methods utilized by deafblind individuals. Since there is a limited number of non-disabled people who are skilled in Finger Braille, deafblind individuals communicate only through interpreters. To assist communication between deafblind individuals and non-disabled people, we have been developing a Finger Braille recognition system using small piezoelectric accelerometers worn by the receiver. The recognition system recognizes the dotting of Finger Braille by the deafblind person and synthesizes this tactile communication into speech for the non-disabled person. The accelerometers were mounted on the top of finger rings. As for the small hand receiver, the bottom of the rings have often contacted the desk by dotting, especially the ring finger. The contact influences the accuracy of recognition. In the present study, we developed two novel mounts of the accelerometers. To prevent the shock acceleration by the contact between the bottom of ring and desk, we adopted cloth band and half-cut ring covered by cloth instead of the previous ring. To evaluate the effectiveness of the developed mounts of accelerometers, a measurement experiment was conducted. The results of the experiment showed that both novel mounts had never caused the shock acceleration by the contact between the bottom of the mounts and desk; the amplitude of acceleration of the half-cut ring covered by cloth was significantly larger than those of the other mounts; the power at 100Hz of the half-cut ring was also significantly larger than those of the other mounts; the damping cycle of the half-cut ring was significantly smaller than those of the other mounts; the accuracy of the recognition of the dotted fingers of the half-cut ring was 88.9%; the accuracy of the recognition of the dotted positions of the half-cut ring was 93.2%. Therefore, the half-cut ring covered by cloth is the most sensitive and effective mount.