Patent ID: 7446752

Claim:
A method, comprising: receiving information associated with an application; determining a periodic control signal based on the information, the periodic control signal configured to drive an actuator having a rotatable mass such that the mass rotates to produce a vibration having a magnitude and a frequency, the magnitude of the vibration being based on a duty cycle of the control signal and independent of the frequency of the vibration; and sending the periodic control signal to the actuator, wherein the control signal has at least one of an on time and an off time, the on-time of the control signal being associated with the magnitude of the vibration, the on-time of the control signal is determined based on a selected frequency of the vibration, if the selected frequency is below a predetermined threshold frequency, the on-time is determined using a first method, and if the selected frequency is above the predetermined threshold frequency, the on-time is determined using a second method.