Method and device for locating at least one touch on a touch surface of an object

The method for locating at least one touch on a touch surface of an object comprises the following steps: - monitoring (100) at least one touch by spreading (102), the touch surface of the object, d elastic mechanical waves from at least one transmission from the object point, and detecting (104) said elastic mechanical waves in at least one receiving point of the object to obtain at least one received signal, and - location (200) of at least a touch on the touch surface of the object by comparing certain characteristics of the sensed signal to a set of reference characteristics. The monitoring step (100) comprises measuring (104, 106) of the signal received during a starting time interval (t) during a transitional phase of the propagation of the emitted waves, for providing an information radiation, disturbed by said at least one touch, said at least one receiving point.