Tuning algorithm for clock source frequency drift

Details Tuning algorithm for clock source frequency drift Tuning algorithm for clock source frequency drift

2007-12-06

2010-02-23

Pham, Toan N (Department: 2612)

Communications: electrical

Systems

Timer control

C340S691100, C340S691200, C340S815400, C340S815520

Reexamination Certificate

active

07667577

ABSTRACT:
An emergency evacuation and fire safety system has a plurality of signal devices. The clock source frequencies are tuned using the method and system such that the signals flash in synchronization continuously at a preset flashing interval upon detecting an alarm condition. A synchronization signal including a calibrated time position is broadcast at each predetermined time interval to all notification appliances. A time difference is computed between a local time position and the received calibrated time position by each of the notification appliances at each predetermined time interval and tuning the flashing of each of the one or more notification appliances by adjusting the preset flashing interval based on the computed time difference by each of the one or more associated notification appliances.

REFERENCES:
patent: 5659287 (1997-08-01), Donati et al.
patent: 6693532 (2004-02-01), Capowski et al.
patent: 6816068 (2004-11-01), McCuen et al.
patent: 7091847 (2006-08-01), Capowski et al.
patent: 7382245 (2008-06-01), Girouard
patent: 2005/0200472 (2005-09-01), Curran et al.

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