Beyond Silence digital piano is a concept music instrument for hearing impaired people, especially children. It would be pretty difficult to grasp the idea of hearing impaired people listen to the music. This concept also helps children to play the piano by feeling the wave and vibration of each tune from the resonance board. The bottom part of Beyond Silence digital piano concept has been designed with a diaphragm to create stronger vibrations and music waves for other hearing-impaired people to feel on the ground.
Source : tuvie