US Patent 9218727 Vibration in portable devices

One embodiment may take the form of a method of reducing noise from vibration of a device on a hard surface. The method includes activating a haptic device to indicate an alert and sensing an audible level during activation of the haptic device. Additionally, the method includes determining if the audible level exceeds a threshold and initiating mitigation routines to reduce the audible level to a level below the threshold if the threshold is exceeded.