Time validation system

Details Time validation system Time validation system

G - Physics

07

C

G07C 1/00 (2006.01) G07C 1/10 (2006.01) G07C 7/00 (2006.01) H04L 9/32 (2006.01) H04N 7/167 (2006.01) H04N 7/62 (2006.01)

Patent

CA 2395026

A system for time validation comprises a termi- nal (1) with means (7,7') for tuning in to a number of different carrier frequencies (a-e), an authorisation de- vice (6), e.g. a smart card, capable of communicating with the terminal (1) and means (2,5) to transmit time stamps, using a modulated signal having a carrier frequency, to the terminal (1). The authorisation device (6) comprises means (8) for selecting a carrier frequency to tune in to for retrieving a time stamp. A terminal (1) and authorisa- tion device (6) are provided for use in the system. A computer program is suitable for loading into a programmable device, e.g. a smart card, to use it as an authorisation de- vice (6) for use in such a system.

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