Patent ID: 9186702
Filing Date: 2015-11-17
Classification: B06B,H04M

Abstract:
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.