Controlling vibrations from multiple vibrator motors in a mobile communications device

摘要

A mobile device that includes a motion sensor, multiple vibrators, and a motor speed determinator module. The motion sensor senses and records vibrations of the mobile device while the multiple vibrators are simultaneously running. The sensed vibrations are transmitted to the motor speed determinator module, which transfers the sensed vibrations into the frequency domain. The vibrations caused by each of the multiple vibrators are represented by peaks in the frequency representation. In one embodiment, the motor speed determinator module drives each vibrator such that the rotational speed and phase of each vibrator are equal or essentially equal. This is represented in the spectral representation of the frequency domain as the overlapping of each peak into a single peak.

主权项

1. A method within a mobile communications device, comprising:
sampling output data of a motion sensor that is integrated in the mobile communications device while a first vibrator motor and a second vibrator motor are both running; converting the sampled output data to frequency domain and detecting frequency and magnitude of each of first and second peak spectral components; computing rotational speed for each of the first and second vibrator motors based on the detected frequencies of the first and second peak spectral components; driving the first and the second vibrator motors using feedback from the detection of the first and second peak spectral components so that the peak spectral components approach each other in frequency until the first and second peak spectral components have merged into a single peak spectral component; and then driving the first and the second vibrator motors using feedback from detection of the merged single peak spectral component so that magnitude of the merged single peak spectral component is increased.