Patent ID: 8390218

Claim:
An apparatus usable in a game controller, the apparatus comprising: a first linear resonant actuator coupled to a housing, the first linear resonant actuator having a first vibration axis and being configured to produce a first vibration force; a second linear resonant actuator coupled to the housing, the second linear resonant actuator having a second vibration axis and being configured to produce a second vibration force; and means for synchronously vibrating the first and second linear resonant actuators to produce at least one of a combined vibration force on the housing the first and second vibration forces or a combined vibration torque on the housing such that a haptic sensation is provided to a user; wherein the means for synchronously vibrating the first and second linear resonant actuators is configured to correct a vibration magnitude for each actuator according to the following equation: A com =A des +A cor where A des represents a desired actuator amplitude for a given vibration of that actuator, A cor represents a correction for the given vibration, and A com represents an actual command amplitude sent to that actuator for the given vibration to correct the vibration magnitude.