Interference Reduction Techniques in Haptic Systems
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United States of America Patent
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Oct 25, 2018
app pub date -
Apr 22, 2018
filing date -
Apr 22, 2018
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Abstract
As control points in haptic systems move around, the phase offsets for each transducer change at discrete points in time. These are each expressed as a phase offset combined with a monochromatic carrier frequency. To prevent sharp frequency changes, an algorithm that maintains smooth transitions is used. Further, non-idealities in the implementation of haptic array modulation can create spurs in the frequency response of audio output from the array. Adjusting the signal carrier frequency and the signal modulating frequency may substantially reduce audio noise via a notch filter centered at an interpolation frequency.
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