Master/slave clock system with automatic protocol detection...

Horology: time measuring systems or devices – Plural timepiece system or system device – Secondary

Reexamination Certificate

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Details

C368S046000

Reexamination Certificate

active

10742271

ABSTRACT:
Disclosed is a method for automatically detecting and selecting a time correction protocol and a time base, from among many possible protocols, in a master/slave clock system. A “self-teaching” feature is also disclosed, which includes a table stored at the slave clock containing data representative of characteristics, such as the relative frequency and spacing, of each one of numerous different time correction pulses that can be received by the slave clock from the master clock. Then, at a time of time correction, the slave clock selects the protocol most likely being used by the master clock, based on historical data. The time displayed by the slave clock is the then updated to match the time displayed by the master clock.

REFERENCES:
patent: 5323803 (1994-06-01), Blumenauer
patent: 5805530 (1998-09-01), Youngberg
patent: 6205090 (2001-03-01), Blount et al.
patent: 2003/0063525 (2003-04-01), Richardson et al.
patent: 2004/0179432 (2004-09-01), Burke

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