Patent ID: 8913039
Filing Date: 2014-12-16
Classification: G06F

Abstract:
1. A method for locating at least one touch on a touch-sensitive surface of an object, comprising: monitoring of at least one touch by propagating, in the touch-sensitive surface of the object, elastic mechanical waves from at least one transmitting point of the object, and by detecting said elastic mechanical waves in at least one reception point of the object, in order to obtain at least one sensed signal, and locating at least one touch on the touch-sensitive surface of the object by comparing certain spectral characteristics of the sensed signal to a set of reference characteristics, the set of reference characteristics including interfered radiation information for predetermined single or multiple touches received during a transient phase of the propagation of the transmitted waves when resonances have not been established in the touch-sensitive surface and the transmitted waves are not stable over time, wherein the monitoring step comprises starting to measure the sensed signal during a time interval starting during the transient phase of the propagation of the transmitted waves, for supplying, to said at least one reception point, information on radiation interfered with by said at least one touch, such that the locating of the at least one touch on the touch-sensitive surface includes a comparison of certain spectral characteristics of the sensed signal measured during the transient phase to the interfered radiation information included in the set of reference characteristics.