Controlling haptic sensations from a vibrotactile feedback device connected to a computer. The vibrotactile device includes an actuator having a rotatable mass, and receives information, which causes a periodic control signal to be produced. The control signal controls the actuator to rotate the mass...http://www.google.com.au/patents/US20040056840?utm_source=gb-gplus-sharePatent US20040056840 - Controlling haptic sensations for vibrotactile feedback interface devices
