Patent ID: 9285777
Filing Date: 2016-03-15
CPC Classification: G04D

Claim Text:
1. A method for authenticating a timepiece comprising: measuring acoustic vibrations emitted by said timepiece to obtain an electrical signal, said electrical signal indicating a variation of a magnitude of said measured acoustic vibrations as a function of time, wherein said electrical signal comprises a plurality of acoustic events associated with mechanical shocks taking place in said timepiece, said acoustic events being separated from each other by respective quiet zones; processing said electrical signal so as to attenuate said plurality of acoustic events in said electrical signal; performing a transform of said processed electrical signal into a frequency domain to obtain a frequency-domain power spectrum indicating a variation of a power of said processed electrical signal as a function of frequency using a processor of a computing device; processing said frequency-domain power spectrum so as to identify at least one narrow peak in said frequency-domain power spectrum corresponding to at least one resonance frequency of a part of said timepiece resonating in a quiet zone; extracting said at least one resonance frequency corresponding to said at least one narrow peak; comparing said extracted at least one resonance frequency with at least one reference resonance frequency; and determining an authenticity of said timepiece based on the comparing.