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1. (WO2018197850) INTERFERENCE REDUCTION TECHNIQUES IN HAPTIC SYSTEMS

Pub. No.:    WO/2018/197850    International Application No.:    PCT/GB2018/051061
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Wed Apr 25 01:59:59 CEST 2018
IPC: G10K 11/34
G06F 3/01
G10K 15/02
Applicants: ULTRAHAPTICS IP LIMITED
Inventors: LONG, Benjamin John Oliver
CARTER, Thomas Andrew
TESTER, David Philip
Title: INTERFERENCE REDUCTION TECHNIQUES IN HAPTIC SYSTEMS
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.