A device for locating an impact against an interactive surface able to propagate progressive mechanical waves from the impact, comprising: - at least three transducers (PT A, PT B, PT C, PT D) arranged and distributed against the interactive surface, designed to capture the progressive mechanical waves propagating in the interactive surface and to transform them into electrical signals, and - an electronic central unit, connected to the transducers (PT A, PT B, PT C, PT D) in order to receive their electrical signals, programmed to locate the impact in the interactive surface by analysing propagation time differences of progressive mechanical waves from the impact to the transducers (PT A, PT B, PT C, PT D) on the basis of instants (t 2, t 2 ', t 2 ") of impact detection identified in the electrical signals received, characterised in that the electronic central unit is programmed to: - trigger an impact detection from a first instant (ti) when at least one M-th derivative from at least one of the received electrical signals exceeds a predetermined non-zero threshold value (V s), where M is a positive integer or zero, and - after triggering the impact detection: • determining, for each electrical signal received from each transducer (PT A, PT B, PT C, PT D), at least one second instant (t 2, t 2 ', t 2 "), subsequent to the first instant (t 1), of the first zero crossing of at least one N-th derivative of this electrical signal, where N is a positive integer or zero, and • identifying, for each electrical signal received from each transducer (PT A, PT B, PT C, PT D), at least one instant (t 2, t 2 ', t 2 ") of impact detection in this electrical signal from said at least one second determined instant (t 2, t 2 ', t 2 "). - at least three transducers (PT A, PT B, PT C, PT D) arranged and distributed against the interactive surface, designed to capture the progressive mechanical waves propagating in the interactive surface and to transform them into electrical signals, and - an electronic central unit, connected to the transducers (PT A, PT B, PT C, PT D) in order to receive their electrical signals, programmed to locate the impact in the interactive surface by analysing propagation time differences of progressive mechanical waves from the impact to the transducers (PT A, PT B, PT C, PT D) on the basis of instants (t 2, t 2 ', t 2 ") of impact detection identified in the electrical signals received, - trigger an impact detection from a first instant (ti) when at least one M-th derivative from at least one of the received electrical signals exceeds a predetermined non-zero threshold value (V s), where M is a positive integer or zero, and - after triggering the impact detection: • determining, for each electrical signal received from each transducer (PT A, PT B, PT C, PT D), at least one second instant (t 2, t 2 ', t 2 "), subsequent to the first instant (t 1), of the first zero crossing of at least one N-th derivative of this electrical signal, where N is a positive integer or zero, and • identifying, for each electrical signal received from each transducer (PT A, PT B, PT C, PT D), at least one instant (t 2, t 2 ', t 2 ") of impact detection in this electrical signal from said at least one second determined instant (t 2, t 2 ', t 2 "). • determining, for each electrical signal received from each transducer (PT A, PT B, PT C, PT D), at least one second instant (t 2, t 2 ', t 2 "), subsequent to the first instant (t 1), of the first zero crossing of at least one N-th derivative of this electrical signal, where N is a positive integer or zero, and • identifying, for each electrical signal received from each transducer (PT A, PT B, PT C, PT D), at least one instant (t 2, t 2 ', t 2 ") of impact detection in this electrical signal from said at least one second determined instant (t 2, t 2 ', t 2 ").