Patent ID: 9176623
Filing Date: 2015-11-03
Classification: G06F

Abstract:
1. A method for reducing noise in a signal sensing a bending wave propagating in an object comprising the steps of: a) causing, via a control unit of a touch sensing device, at least one bending wave to propagate through a touch sensing device; b) receiving one or more sensed signals, via the control unit of the touch sensing device, representative of a plurality of locations of the object; and c) fitting a function satisfying bending wave propagation properties to the one or more sensed signals, thereby reducing noise contributions to the one or more sensed signals not satisfying the bending wave propagation properties, wherein the bending wave propagation properties comprise properties configured to satisfy the Helmholtz equation, and wherein a bending wave dispersion relation with ω being the angular frequency of the bending wave propagating in the object, E, υ and ρ being respectively the modulus of elasticity, the Poisson's ratio and the density of the object and h being the thickness of the object, is satisfied by the fitting function.